JP4728585B2 - X-ray diagnostic apparatus and data processing method of X-ray diagnostic apparatus - Google Patents

Description

  The present invention relates to an X-ray diagnostic apparatus that irradiates a subject with X-rays and visualizes the inside of the subject, and a data processing method of the X-ray diagnostic apparatus.

  2. Description of the Related Art Conventionally, there is an X-ray diagnostic apparatus as an apparatus that generates an image by irradiating a human body as a subject with X-rays, detecting the transmitted X-rays, and visualizing the structure inside the subject.

  In recent years, in diagnostics using an imaging device such as an X-ray diagnostic apparatus, interventional radiology (interventional) is performed in which a special instrument such as a catheter is inserted into a subject and operated while checking the state inside the subject. Radiology (IVR) and advanced techniques such as catheter ablation, in which the treatment site is electrically cauterized or cut by flowing high-frequency waves from electrodes attached to the tip of the catheter, are performed. For this reason, when an X-ray diagnostic apparatus is used, the fluoroscopic time of X-rays to the subject is prolonged, and the imaging frequency tends to increase.

  For this reason, the exposure dose of the subject has increased, and the occurrence of skin damage due to radiation has been increasing. In view of this, various techniques have been proposed for X-ray diagnostic apparatuses in order to prevent the occurrence of skin damage caused by X-ray irradiation.

  For example, as an X-ray diagnostic apparatus used for obtaining a fluoroscopic image of a subject, warning means for emitting a warning sound when the fluoroscopic time of X-ray reaches a set value (for example, about 1 to 5 minutes), X-ray blocking means is provided for forcibly blocking X-ray irradiation to the subject when X-ray fluoroscopy is continued for a certain period of time (for example, 10 minutes).

  In addition, X-rays to the skin can be measured by combining the integrated skin dosimeter (SDM) and thermoluminescence dosimeter (TLD), or by measuring the irradiation dose using an area dosimeter. An X-ray diagnostic apparatus having a technique for estimating the irradiation dose is proposed.

On the other hand, a simple surface dose conversion method (non-dosimeter dosimetry: NDD) is known as a method for estimating the X-ray irradiation dose to the skin from the X-ray output (see, for example, Non-Patent Document 1 and Non-Patent Document 2).
Ibaraki Prefectural Radiological Engineers Association "About the NDD method", [online], [March 3, 2004 search], Internet <URL: http: // www. sunshine. ne. jp / ˜iart / frame. htm> Kyosuke Yasuda “Estimation of surface dose by NDD method”, [online], August 17, 2002 Gifu Prefectural Radiation Engineers Association Gifu Prefectural Radiation Management Division 4th Radiation Management Study Group, [2004 3 Month 3 search], Internet <URL: http: // www. hsnt. or. jp / ˜gifu-rt / rsv / rsv. 4kai1. htm>

  Conventionally, in order to prevent skin damage caused by radiation such as X-rays, it is important to monitor the exposure dose of a subject during surgery. However, in the conventional X-ray diagnostic apparatus provided with warning means and X-ray blocking means, the warning or X-ray is based on the X-ray fluoroscopy time, regardless of the X-ray irradiation dose applied to the skin of the subject. Therefore, the exposure dose of the subject cannot be monitored.

  Furthermore, even if the exposure dose of the subject is monitored, the radiation dose value may be caused by X-ray skin damage during examination or treatment only by measuring and displaying the exposure dose value as in the conventionally proposed X-ray diagnostic apparatus. Even if a threshold value that may occur is reached, it may be noticed that the irradiation dose value has exceeded the threshold value after the examination or treatment without being noticed during the examination or treatment.

  Further, even if it is determined that the irradiation dose value has exceeded the threshold during the examination or treatment, if the examination or treatment cannot be interrupted, excessive exposure of the subject cannot be avoided.

  The present invention has been made to cope with such a conventional situation, and even when the X-ray irradiation dose value to the subject may reach a threshold at which skin damage may occur, An object of the present invention is to provide an X-ray diagnostic apparatus and a data processing method for the X-ray diagnostic apparatus that can prevent the occurrence of skin damage due to X-rays.

In order to achieve the above object, an X-ray diagnostic apparatus according to the present invention provides a bed on which a subject is placed and an X-ray generation source that irradiates the subject with X-rays, as described in claim 1. An X-ray detection means for detecting X-rays transmitted through the subject, a position sensor for acquiring position information of the bed and the X-ray generation source, an elapsed time from the start of irradiation, and the X-ray Dose estimation means for estimating the X-ray dose to the subject during imaging based on the tube current applied to the generation source and the position information of the bed and the X-ray generation source acquired by the position sensor And an irradiable indicator amount estimating means for calculating a remaining time until a difference or ratio between a predetermined irradiation amount limit value and the X-ray irradiation amount estimated by the irradiation amount estimating means reaches a first threshold value. When, Table the remaining time calculated by the irradiation enable index estimating means Display means, warning means for issuing a warning when a difference or ratio between the dose limit value and the X-ray dose estimated by the dose estimate means reaches a first threshold, and the dose When the difference or ratio between the limit value and the X-ray irradiation amount estimated by the irradiation amount estimating means reaches a second threshold value that is smaller than the first threshold value, the X-ray irradiation is cut off. And a blocking means .

Data processing method of the X-ray diagnostic apparatus according to the present invention, in order to achieve the above object, as described in claim 7, detects X-rays transmitted through the subject, the bed and the X-ray source Based on the elapsed time since the acquisition of the position information and the start of irradiation, the tube current applied to the X-ray generation source, and the position information of the bed and the X-ray generation source, the subject is being imaged . The X-ray irradiation dose is estimated, the remaining time until the difference or ratio between the predetermined dose limit value and the estimated X-ray irradiation amount reaches the first threshold value is calculated, and the calculated remaining amount is calculated. Time is displayed, a warning is issued when a difference or ratio between the dose limit value and the X-ray dose reaches a first threshold, and the dose limit value and the X-ray dose are this difference or ratio block the irradiation of the X-ray when it reaches the second threshold value smaller than the first threshold value Is a method which is characterized in.

  In the X-ray diagnostic apparatus and the data processing method of the X-ray diagnostic apparatus according to the present invention, there is a possibility that the X-ray irradiation dose value to the subject may reach a threshold that may cause skin damage. In addition, the occurrence of skin damage due to X-rays can be prevented in advance.

  Embodiments of an X-ray diagnostic apparatus and a data processing method of the X-ray diagnostic apparatus according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a configuration diagram showing a first embodiment of an X-ray diagnostic apparatus according to the present invention, and FIG. 2 is a conceptual diagram showing a detailed configuration of the X-ray diagnostic apparatus 1 shown in FIG.

  The X-ray diagnostic apparatus 1 includes an X-ray generation unit (X-ray tube) 3 as an X-ray generation source at one end of a C arm 2 and an X-ray detection unit 4 as an X-ray detection means at the other end. The line generation unit 3 and the X-ray detection unit 4 are arranged to face each other and fixedly held.

  A bed 5 is provided between the X-ray generator 3 and the X-ray detector 4. The bed 5 includes a top plate 6 and legs 7 that support the top plate 6, and a subject P that is a patient is mounted on the top plate 6. The top plate 6 is configured to be movable in a required direction, for example, a vertical direction and a horizontal direction.

  A motor 8 and a position sensor 9 are respectively provided on the top plate 6 and the C arm 2 of the bed 5, and each motor 8 and the position sensor 9 are connected to the machine control unit 10. The motor 8 is controlled by the machine control unit 10 in accordance with the sensor information of the position sensor 9, and the top plate 6 and the C arm 2 of the bed 5 are driven so as to have a required positional relationship.

  The X-ray generator 3 is connected to the high voltage generator 11 and is configured to receive a required voltage from the high voltage generator 11 and irradiate the subject P with X-rays. Further, the high voltage generation unit 11 is connected to the X-ray control unit 12, and the X-ray control unit 12 controls the high voltage generation unit 11 to irradiate X from the X-ray generation unit 3 during imaging and fluoroscopy. The line is controlled.

  Further, the machine control unit 10 and the X-ray control unit 12 are connected to the main control unit 13 and controlled by the main control unit 13.

  The main control unit 13 includes various control units such as a machine control unit 10 and an X-ray control unit 12, input means such as an imaging protocol selection unit (X-ray condition input unit) 14, a skin irradiation dose limit value input unit 15 and the like. A display unit such as a protocol display unit (X-ray condition display unit) 16, a fluoroscopyable time display unit 17, a shootable number display unit 18 and the like, and a warning information output unit 19 are connected. The warning information output unit 19 includes an output unit such as a display device or a speaker.

  Then, based on information input from the input means such as the imaging protocol selection unit 14 and the skin irradiation dose limit value input unit 15, a control signal is given from the main control unit 13 to the machine control unit 10 and the X-ray control unit 12. As a result, the entire X-ray diagnostic apparatus 1 is managed or controlled, and information to be displayed can be given to display means such as the imaging protocol display unit 16, the fluoroscopyable time display unit 17, and the radiographable number display unit 18 so as to be displayed. Configured.

  The main control unit 13 includes a main CPU (Central Processing Unit) 20 and a main storage device 21, an imaging protocol recording medium (X-ray condition recording medium) 22, a position storage medium 23, and a skin irradiation dose limit value storage medium. Storage means such as 24 are provided.

  The imaging protocol selection unit 14 gives the main CPU 20 X-ray condition information such as imaging conditions and fluoroscopy conditions, and selection information of imaging protocols and examination protocols in which imaging conditions and fluoroscopy conditions are set in advance according to the imaging technique. And has a function of setting X-ray conditions.

  The imaging protocol display unit 16 has a function of receiving and displaying X-ray condition information such as imaging conditions and fluoroscopy conditions set by the imaging protocol selection unit 14 or selected imaging protocols and inspection protocols from the main CPU 20.

  The skin irradiation dose limit value input unit 15 has a function of giving the main CPU 20 a skin irradiation dose limit value, which is an X-ray irradiation dose value serving as a reference for the presence or absence of the risk of radiation skin damage. As the skin irradiation dose limit value, for example, 3 Gray (Gy) which is a threshold for temporary hair loss or 2 Gy which is a threshold for initial erythema can be used.

  The main CPU 20 has a function of reading various programs from the main storage device 21 and executing various information processing necessary for controlling the entire X-ray diagnostic apparatus 1 or managing information.

  FIG. 3 is a functional block diagram of the main control unit 13 of the X-ray diagnostic apparatus 1 shown in FIG.

  The main CPU 20 of the main control unit 13 reads the program, information management means 30, control means 31, skin irradiation dose estimation means 32, fluoroscopyable time estimation means 33, shootable number estimation means 34, warning means 35, and X-rays. It functions as the blocking means 36.

  The information management means 30 has a function of managing various information. That is, the information management unit 30 receives various information from the input unit such as the imaging protocol selection unit 14 and the skin irradiation dose limit value input unit 15 and the control unit 31, and the main storage device 21, the imaging protocol recording medium as necessary. 22, a function of writing in a storage unit such as the position storage medium 23 and the skin irradiation dose limit value storage medium 24, and a function of reading information stored in the storage unit and giving it to each component.

  For example, the information management means 30 receives various control information from the control means 31 and writes it to the storage means such as the position storage medium 23, and receives X-ray condition information from the imaging protocol selection unit 14 and writes it to the imaging protocol recording medium 22. A function of receiving a skin irradiation dose limit value from the skin irradiation dose limit value input unit 15 and writing it to the skin irradiation dose limit value storage medium 24;

  The information management means 30 has a function of giving the X-ray condition information recorded on the imaging protocol recording medium 22 to the imaging protocol display unit 16 for display.

  The control unit 31 applies a control signal to the machine control unit 10 and the X-ray control unit 12 based on the information received from the information management unit 30 to irradiate the subject P from the position of the bed 5 and the X-ray generation unit 3. A function of receiving control information such as position information of the bed 5 and the X-ray generation unit 3 and information related to the X-rays from the machine control unit 10 and the X-ray control unit 12 and giving the control information to the information management means 30 Have.

  The skin irradiation dose estimation means 32 receives the X-ray condition information from the information management means 30 and the positional information of the bed 5 and the X-ray generator 3 as information indicating the relative positional relationship between the X-rays and the subject P. The function of estimating the skin irradiation dose of X-rays irradiated to the subject P by an arbitrary method, the fluoroscopic time estimation means 33, the shootable number estimation means 34, the warning means 35 and the X A function to be given to the line blocking means 36. As a method for estimating the skin irradiation dose, for example, a known NDD method (Non Dosimeter Dosimetry method) can be mentioned.

  Further, the skin irradiation dose estimation means 32 has a function of repeatedly recalculating the X-ray skin irradiation dose at any time or at regular intervals, following X-ray conditions during imaging or fluoroscopy and changes in the position of the bed 5. Provided.

  The fluoroscopyable time estimation means 33 calculates the skin irradiation dose from a predetermined time received from the skin irradiation dose estimation means 32, for example, the skin irradiation dose at the current time and the skin irradiation dose limit received from the main CPU 20. It has a function of estimating the fluoroscopic time required to reach the limit value and a function of displaying the estimated time by giving it to the fluoroscopic time display unit 17 as the fluoroscopic time.

  Similarly to the skin irradiation dose estimation unit 32, the fluoroscopyable time estimation unit 33 repeatedly repeats the fluoroscopy time at any time or at regular intervals following the change in the X-ray skin irradiation dose during imaging or fluoroscopy. A function to calculate is provided.

  The number of shootable images estimating means 34 determines the skin irradiation dose from a predetermined time received from the skin irradiation dose estimation means 32, for example, the skin irradiation dose at the current time and the skin irradiation dose limit received from the main CPU 20. It has a function of estimating the number of images that can be photographed before reaching the limit value, and a function of displaying the estimated number of images by giving it to the photographable number display unit 18 as the number of images that can be photographed.

  In addition, the number of shootable images estimating means 34 repeats the number of shootable images at any time or at regular intervals, following changes in the X-ray skin irradiation dose during imaging or fluoroscopy, similar to the skin irradiation dose estimating means 32. A function to calculate is provided.

  That is, the fluoroscopyable time estimation unit 33 and the shootable image number estimation unit 34 function as an example of an irradiable index amount estimation unit that calculates an irradiable index amount that is an index amount that can be continuously irradiated with X-rays. The possible time and the number of shootable images are used as an example of the irradiable index amount.

  The warning means 35 has a function to generate warning information based on the skin irradiation dose received from the skin irradiation dose estimation means 32 and the skin irradiation dose limit value received from the main CPU 20 and to output the warning information to the warning information output unit 19. Have. That is, the warning means 35 is used when the difference or ratio between the skin irradiation dose received from the skin irradiation dose estimation means 32 and the skin irradiation dose limit received from the main CPU 20 falls within a predetermined threshold or when the skin irradiation dose is Has a function of outputting warning display image information or warning sound as warning information to the display device or speaker of the warning information output unit 19 when the skin irradiation dose limit value is reached.

  Based on the skin irradiation dose received from the skin irradiation dose estimation means 32 and the skin irradiation dose limit value received from the main CPU 20, the X-ray blocking means 36 determines the difference or ratio between the skin irradiation dose and the skin irradiation dose limit value. It has a function of forcibly blocking X-ray irradiation when it reaches a certain condition, such as when it falls within a predetermined threshold or when the skin irradiation dose reaches the skin irradiation dose limit value. As a method for blocking the X-ray irradiation, for example, a method for blocking a control signal between the X-ray generation unit 3 and the main control unit 13 or a subject P and the X-ray generation unit 3 for actually irradiating X-rays. And a method of blocking with a shield.

  On the other hand, the X-ray detection unit 4 is, for example, I.D. I. (Image intensifier) and an X-ray flat detector, etc., and an X-ray detection system and an optical system, and has a function of detecting X-rays transmitted through the subject P. The X-ray detection unit 4 is connected in parallel with the image signal processing unit 37, the luminance control unit 38, and the exposure timer control unit 39, and is configured to receive an X-ray detection signal. The image signal processing unit 37 is connected to the image display unit 40 and the image storage medium 41.

  The image signal processing unit 37 receives the X-ray detection signal transmitted through the subject P from the X-ray detection unit 4 and generates X-ray image data by various signal processing, and displays the generated X-ray image data as an image. The display unit 40 has a function of giving the image to the unit 40 for display and writing X-ray image data in the image storage medium 41.

  The luminance control unit 38 receives an X-ray detection signal transmitted through the subject P from the X-ray detection unit 4, and sets the X-ray condition reset information so that the luminance of the X-ray image becomes an appropriate luminance. It has a function of giving the feedback to the control unit 12.

  The exposure timer control unit 39 receives an X-ray detection signal transmitted through the subject P from the X-ray detection unit 4 and converts it into an electric signal, calculates an integrated value of the converted electric signal, and sets the integrated value to a constant value. In this case, it has a function of blocking X-rays by giving a control signal to an exposure timer (not shown) of the X-ray control unit 12 having a function of blocking X-ray irradiation.

  Next, the operation of the X-ray diagnostic apparatus 1 will be described.

  FIG. 4 is a flowchart showing a procedure for performing an X-ray diagnosis of the subject P by the X-ray diagnostic apparatus 1 shown in FIG. 1, and the reference numerals with numerals in the figure indicate each step of the flowchart.

  First, in step S1, an X-ray skin irradiation dose limit value that is a reference for the presence or absence of a risk of occurrence of radiation skin damage and X-ray conditions such as imaging conditions and fluoroscopic conditions in X-ray imaging is set. That is, for example, imaging protocol selection information is given to the main CPU 20 as X-ray condition information from the imaging protocol selection unit 14, and 3Gy, which is a temporary hair loss threshold value, is supplied from the skin irradiation dose limit value input unit 15 as a skin irradiation dose limit value As given to the main CPU 20.

  Therefore, the information management means 30 receives the X-ray condition information received from the imaging protocol selection unit 14 in the imaging protocol recording medium 22 and the skin irradiation dose limit value received from the skin irradiation dose limit value input unit 15 as the skin irradiation dose limit value. Each is written in the storage medium 24. Further, X-ray condition information is given from the information management means 30 to the imaging protocol display unit 16 and displayed.

  Next, in step S2, the subject P is irradiated with X-rays from the X-ray generation unit 3 according to the set X-ray conditions, and the transmitted X-rays are detected by the X-ray detection unit 4, and X-ray image data is displayed as an image. Displayed on the unit 40.

  That is, the control means 31 receives the sensor information of the position sensor 9 provided on the top plate 6 and the C arm 2 of the bed 5 as the position information of the bed 5 via the machine control unit 10 and gives it to the information management means 30. Further, the information management means 30 writes the position information of the bed 5 in the position storage medium 23. Further, the information management means 30 gives the control means 31 the X-ray conditions stored in the imaging protocol recording medium 22.

  The control unit 31 refers to the position information of the bed 5 and controls the machine so that X-rays according to the X-ray condition received from the information management unit 30 are irradiated from the X-ray generation unit 3 to a required region of the subject P. A control signal is given to the unit 10 and the X-ray control unit 12.

  For this reason, the machine control unit 10 controls the motor 8 by the control signal received from the main CPU 20 to drive the bed 5 and the C-arm 2 to have a required positional relationship, while the X-ray control unit 12 controls the main CPU 20. The high voltage generator 11 is controlled by the control signal received from the high voltage generator 11, a required voltage is applied from the high voltage generator 11 to the X-ray generator 3, and X-rays in accordance with the X-ray conditions are irradiated to the required region of the subject P Is done.

  Then, the X-ray transmitted through the subject P is detected by the X-ray detection unit 4, and the detection signal is given to the image signal processing unit 37, the luminance control unit 38 and the exposure timer control unit 39. The luminance control unit 38 provides the X-ray control unit 12 with feedback information for resetting the X-ray conditions so that the luminance of the X-ray image becomes an appropriate luminance based on the detection signal received from the X-ray detection unit 4. The exposure timer control unit 39 converts the detection signal received from the X-ray detection unit 4 into an electrical signal to calculate an integral value, and the exposure (not shown) of the X-ray control unit 12 according to the calculated integration value of the electrical signal. Give a control signal to the timer.

  Further, the image signal processing unit 37 generates X-ray image data by performing various kinds of signal processing on the X-ray detection signal received from the X-ray detection unit 4, and provides the image display unit 40 for display. Further, the X-ray image data is written and stored in the image storage medium 41 as necessary.

  For this reason, the user can confirm the X-ray image of the subject P and perform X-ray diagnosis.

  On the other hand, in step S3, the skin irradiation dose estimation means 32 receives the X-ray condition information and the position information of the bed 5 from the information management means 30, and irradiates the subject P by a known NDD method (Non Dosimeter Dosimetry method), for example. Estimate the X-ray skin irradiation dose.

  The skin irradiation dose can be estimated by a known formula (1) according to the NDD method. For this reason, the skin irradiation dose estimation means 32 estimates the skin irradiation dose from the distance from the focal point determined by the position information of the bed 5 to the skin, the tube current of the X-ray tube, tube voltage, and aluminum filtration as the X-ray condition information. can do.

[Equation 1]
D = (NDD-M) × mAs × (1 / FSD) ² [mGy] (1)
However,
D: Skin irradiation dose (mGy)
(NDD-M): coefficient mAs determined from aluminum filtration and tube voltage of X-ray tube: tube current (mA) of X-ray tube × shooting time (sec)
FSD: Distance from focus to skin (m)
It is.

  Incidentally, when obtaining (NDD-M), the total filtration of the X-ray generator 3 and the X-ray diaphragm is used for the calculation.

  The skin irradiation dose estimation means 32 gives the obtained skin irradiation dose to the fluoroscopyable time estimation means 33, the shootable image number estimation means 34, the warning means 35, and the X-ray blocking means 36.

  Next, in step S <b> 4, the fluoroscopic time estimation means 33 determines the skin irradiation dose from the skin irradiation dose received from the skin irradiation dose estimation means 32 and the skin irradiation dose limit received from the information management means 30. The time required to reach the value is estimated, and the estimated time is displayed on the fluoroscopic time display unit 17 as the fluoroscopic time.

  As a method for estimating the fluoroscopyable time, it can be estimated as an imaging time when the skin irradiation dose corresponds to the difference between the skin irradiation dose limit value and the current skin irradiation dose.

  On the other hand, the shootable image number estimation unit 34 determines that the skin irradiation dose reaches the skin irradiation dose limit value from the skin irradiation dose received from the skin irradiation dose estimation unit 32 and the skin irradiation dose limit value received from the information management unit 30. The number of images that can be photographed is estimated, and the estimated number of images is displayed as the number of images that can be photographed.

  As a method for estimating the number of images that can be taken, it can be estimated by dividing the fluoroscopy time by the image taking time per image taken.

  For this reason, the user confirms the X-ray image of the subject P and performs X-ray diagnosis, and continuously irradiates the subject P with the X-ray to allow the X-ray diagnosis to be performed or the image that can be captured. The number of sheets can be grasped. As a result, the occurrence of radiation skin injury of the subject P is avoided in advance.

  On the other hand, in step S5, the warning means 35 and the X-ray blocking means 36 steadily compare the skin irradiation dose received from the skin irradiation dose estimation means 32 with the skin irradiation dose limit value received from the information management means 30.

  Furthermore, in step S6, the warning unit 35 and the X-ray blocking unit 36 determine whether, for example, the ratio between the skin irradiation dose and the skin irradiation dose limit value is within a predetermined threshold value. At this time, the threshold used by the warning unit 35 for the determination and the threshold used by the X-ray blocking unit 36 for the determination may be the same or different. For example, the threshold used by the warning unit 35 for determination is set larger than the threshold used by the X-ray blocking unit 36 for determination.

  In step S7, when it is determined by the warning means 35 that the ratio between the skin irradiation dose and the skin irradiation dose limit value is within the threshold value after the imaging time has elapsed, the warning information output unit 19 is notified from the warning means 35. Warning display image information and warning sound are given to the display device and the speaker as warning information and output.

  For this reason, the user can always perform X-ray diagnosis without staring at the fluoroscopic time display unit 17 and the number of shootable images display unit 18, and in the unlikely event, the fluoroscopic time display unit 17 and the number of shootable images display unit. Even if 18 cannot be confirmed, it can be known that the subject P is approaching the skin irradiation dose that may cause radiation skin damage.

  In step S8, if the imaging time has elapsed and the X-ray blocking means 36 determines that the ratio between the skin irradiation dose and the skin irradiation dose limit value is within the threshold, the X-ray blocking means 36 By giving a control signal to the X-ray control unit 12, X-ray irradiation is forcibly cut off.

  For this reason, even if the user approaches the skin irradiation dose that may cause radiation skin damage to the subject P without stopping the X-ray irradiation, the X-ray is surely cut off and the subject P is irradiated. Generation | occurrence | production of the radiation skin disorder of the sample P is avoided.

  On the other hand, if it is determined in step S6 that the ratio between the skin irradiation dose and the skin irradiation dose limit value is not within a predetermined threshold value, X-ray imaging can be continued.

  In step S9, when it is determined by the control means 31 that the X photographing has not been completed, the X photographing is continued.

  For this reason, again in step S1, the same X-ray conditions and the position of the bed 5 or the X-ray conditions and the position of the bed 5 are changed by the execution of the imaging protocol and the input information from the imaging protocol selection unit 14 as necessary. The information management means 30 manages the line condition and the change information of the position information of the bed 5.

  In step S2 again, the subject P is irradiated with new X-rays in accordance with the same or changed X-ray conditions. Then, the transmitted X-ray is detected by the X-ray detection unit 4, and X-ray image data is displayed on the image display unit 40.

  Further, the information management means 30 gives the same or changed X-ray conditions and the position information of the bed 5 to the skin irradiation dose estimation means 32.

  Therefore, when the X-ray condition and the position information of the bed 5 are changed again from step S3 to step S6, the skin irradiation dose is estimated by the skin irradiation dose estimating means 32 following the X-ray condition and the position information of the bed 5. The fluoroscopyable time estimation unit 33 and the shootable image number estimation unit 34 calculate the fluoroscopyable time and the shootable number of images based on the recalculated skin irradiation dose, respectively, and the fluoroscopyable time display unit 17 and the shootable image number display unit are recalculated. 18 is displayed.

  Further, the warning means 35 and the X-ray blocking means 36 steadily compare the skin irradiation dose received from the skin irradiation dose estimation means 32 with the skin irradiation dose limit value received from the information management means 30.

  Further, following the same procedure, the fluoroscopic time and the number of shootable images are recalculated following the changes in the X-ray conditions and the position information of the bed 5 and displayed on the fluoroscopic time display unit 17 and the shootable number display unit 18. The For this reason, the user dynamically controls the X-ray conditions and the position of the bed 5 to perform the X-ray diagnosis, and continuously irradiates the subject P with the X-rays so that the X-ray diagnosis can be performed. It is possible to grasp the number of images that can be taken. As a result, the occurrence of radiation skin injury of the subject P is avoided in advance.

  According to the X-ray diagnostic apparatus 1 as described above, it is possible to perform fluoroscopy in advance even when the X-ray irradiation dose value to the subject P may reach a threshold that may cause skin damage. Since the time and the number of images that can be photographed are displayed as specific numerical values, it is possible to prevent skin damage caused by X-rays. That is, the user can appropriately operate the X-ray diagnostic apparatus 1 while performing examination and diagnosis with reference to the fluoroscopic time and the number of images that can be captured.

  Further, in the X-ray diagnostic apparatus 1, even if the fluoroscopic time display unit 17 and the number of shootable images display unit 18 cannot be confirmed, the skin irradiation dose that may cause radiation skin damage to the subject P due to the warning information You can know that you are approaching. Therefore, the user can make a diagnosis without constantly staring at the fluoroscopic time display unit 17 and the shootable number display unit 18.

  FIG. 5 is a functional block diagram showing a second embodiment of the X-ray diagnostic apparatus according to the present invention.

  The X-ray diagnostic apparatus 1A shown in FIG. 5 is different from the X-ray diagnostic apparatus 1 shown in FIG. 1 in that the dosimeter 50 is provided and the function of the skin irradiation dose estimation means 32 is different. Since other configurations and operations are not substantially different from those of the X-ray diagnostic apparatus 1 shown in FIG. 1, only the main control unit 13 and the configuration in the vicinity thereof are illustrated, and the same components are denoted by the same reference numerals and described. Omitted.

  That is, in the X-ray diagnostic apparatus 1 </ b> A, the dosimeter 50 is provided and connected to the main control unit 13.

  The dosimeter 50 is configured to measure the dose of X-rays generated from the X-ray generation unit 3 and give the dose to the skin irradiation dose estimation means 32. The skin irradiation dose estimation means 32 is configured to estimate the X-ray skin irradiation dose irradiated to the subject P by an arbitrary method based on the X-ray irradiation dose received from the dosimeter 50.

  That is, the X-ray diagnostic apparatus 1A can estimate the skin irradiation dose from the measured value of the dosimeter 50 instead of estimating the skin irradiation dose from the X-ray condition information and the position information of the bed 5 in the X-ray diagnostic apparatus 1 shown in FIG. It is a configuration.

  Note that the estimation of the skin irradiation dose from the X-ray condition information and the position information of the bed 5 and the estimation of the skin irradiation dose from the measurement value of the dosimeter 50 can be switched or used together.

  Therefore, according to the X-ray diagnostic apparatus 1A, in addition to the same effects as those of the X-ray diagnostic apparatus 1 shown in FIG. 1, it is possible to more accurately estimate the X-ray skin irradiation dose, the imaging time, and the number of images that can be captured. it can.

  In addition, you may abbreviate | omit a part of component in X-ray diagnostic apparatus 1 and 1A of each embodiment. Also, all or some of various input means, storage means, and output means may be shared.

FIG. 1 is a configuration diagram showing a first embodiment of an X-ray diagnostic apparatus according to the present invention. The conceptual diagram which shows the detailed structure of the X-ray diagnostic apparatus shown in FIG. The functional block diagram of the main control part of the X-ray diagnostic apparatus shown in FIG. The flowchart which shows the procedure at the time of implementing the X-ray diagnosis of a subject by the X-ray diagnostic apparatus shown in FIG. The functional block diagram which shows 2nd Embodiment of the X-ray diagnostic apparatus which concerns on this invention.

Explanation of symbols

1, 1A X-ray diagnostic device 2 C-arm 3 X-ray generator (X-ray tube)
4 X-ray detection unit 5 Bed 6 Top plate 7 Leg 8 Motor 9 Position sensor 10 Machine control unit 11 High voltage generation unit 12 X-ray control unit 13 Main control unit 14 Imaging protocol selection unit (X-ray condition input unit)
15 Skin Irradiation Dose Limit Input Unit 16 Imaging Protocol Display Unit (X-ray Condition Display Unit)
17 Displayable time display unit 18 Number of shootable images display unit 19 Warning information output unit 20 Main CPU
21 Main storage device 22 Imaging protocol recording medium (X-ray condition recording medium)
23 position storage medium 24 skin irradiation dose limit value storage medium 30 information management means 31 control means 32 skin irradiation dose estimation means 33 fluoroscopic time estimation means 34 shootable number estimation means 35 warning means 36 X-ray blocking means 37 image signal processing unit 38 Brightness Control Unit 39 Exposure Timer Control Unit 40 Image Display Unit 41 Image Storage Medium 50 Dosimeter P Subject

Claims (7)

A bed on which the subject is placed;
And X-ray source for irradiating X-rays to the subject,
X-ray detection means for detecting X-rays transmitted through the subject;
A position sensor for acquiring position information of the bed and the X-ray generation source;
The subject under imaging based on the elapsed time from the start of irradiation, the tube current applied to the X-ray generation source, and the position information of the bed and the X-ray generation source acquired by the position sensor A dose estimation means for estimating an X-ray dose to
An irradiable indicator amount estimating means for calculating a remaining time until a difference or ratio between a predetermined irradiation amount limit value and the X-ray irradiation amount estimated by the irradiation amount estimating means reaches a first threshold ;
Display means for displaying the remaining time calculated by the irradiable index amount estimating means;
Warning means for issuing a warning when a difference or ratio between the dose limit value and the X-ray dose estimated by the dose estimation means reaches a first threshold;
X-ray irradiation when the difference or ratio between the dose limit value and the X-ray dose estimated by the dose estimation means reaches a second threshold value that is smaller than the first threshold value. Blocking means for blocking
An X-ray diagnostic apparatus comprising: The irradiation can index amount estimating means, and X-ray condition of the X-rays emitted from the X-ray source, to recalculate the remaining time in accordance with a change of the position information of the X-ray source and the bed The X-ray diagnostic apparatus according to claim 1. The irradiation amount estimating means, and X-ray condition, any of the position information of the X-ray source and the bed according to claim 1 or 2, characterized in that so as to estimate the X-ray irradiation dose The X-ray diagnostic apparatus according to Item 1. The X-ray diagnostic apparatus according to any one of claims 1 to 3 , wherein the irradiation amount estimation means estimates an X-ray irradiation amount from a measurement value of a dosimeter. When the X-ray irradiation amount of the subject reaches a predetermined irradiation amount limit value, a warning unit for outputting warning information or a blocking unit for blocking irradiated X-rays is provided. The X-ray diagnostic apparatus according to any one of claims 1 to 4 . The irradiation enable index estimating means, X-rays diagnostic apparatus according to any one of claims 1 to 5, characterized in that recalculating the remaining time for each fixed time. Detect X-rays that have passed through the subject,
Obtain position information of the bed and X-ray source,
Based on the elapsed time from the start of irradiation, the tube current applied to the X-ray generation source, and the position information of the bed and the X-ray generation source , the X-ray irradiation amount to the subject during imaging is calculated. Estimate
Calculating the remaining time until the difference or ratio between the predetermined dose limit value and the estimated X-ray dose reaches the first threshold ;
Display the calculated remaining time,
A warning is issued when the difference or ratio between the dose limit value and the X-ray dose reaches a first threshold,
Shutting off the X-ray irradiation when the difference or ratio between the dose limit value and the X-ray dose reaches a second threshold value that is smaller than the first threshold value;
A data processing method for an X-ray diagnostic apparatus.

Images