CN107126192A - A kind of knub position real-time monitoring system and its monitoring method - Google Patents

Abstract

The invention discloses a tumor position real-time monitoring system, which comprises a respiration flow meter, an MLC drive mechanism of a machine head and a PLC controller, the respiration flow meter includes a flow meter body (1), and the left and right sides The bell pipe (4) and the air outlet pipe (5) are respectively arranged, the flow meter (6) is arranged on the air outlet pipe (5), the end of the air outlet pipe (5) is hinged with the first opening and closing door (7), the machine head The MLC drive mechanism includes two longitudinal guide rails (10), on which two sliders (11) that can slide along the longitudinal guide rails (10) are arranged, and on the sliders (11), there are guide sleeves (12) , a transverse guide rail (17) is arranged between two opposite guide sleeves (12), and an MLC (13) is arranged between the two transverse guide rails (17); it also discloses a tracking method. The beneficial effects of the invention are: tracking the tumor movement caused by respiratory movement more accurately, providing favorable conditions for subsequent tumor treatment, and the tracking method is simple.

Description

A real-time monitoring system and method for tumor location

technical field

The invention relates to the technical field of lung tumor tracking, in particular to a tumor location real-time monitoring system and a monitoring method thereof.

Background technique

At present, the respiratory gating system is mainly controlled by foreign manufacturers, mainly including the infrared binocular respiratory gating system from GE, the abdominal pressure-sensitive respiratory gating system from Philips, and an active breathing system called ABC. The gating system and Elekta's predictive respiratory gating system, in simple terms, GE uses two infrared cameras to sense the body surface driven by the breathing movement of the module placed on the patient's body surface (mainly the chest and abdomen). Movement, and then through a series of algorithms to simulate the image movement caused by breathing movement.

The biggest difference between Philips' abdominal pressure-sensitive respiratory gating system and GE's is the front-end measurement method. Philips uses an abdominal belt that can sense pressure changes and binds it to the chest and abdomen of the person being measured. The movement of the watch drives the abdominal belt to cause pressure changes to be measured, and the difference in the back course lies in the algorithm.

Among all the current respiratory gating technologies, the most significant disadvantage lies in the measurement of respiratory movement through "indirect sensing". In other words, almost all methods use data from the body surface, ECG, etc. to estimate the movement of the lungs in the body. . ABC active respiratory gating is mainly used in radiotherapy. Its principle is to suspend breathing movement through passive breath-holding, and at the same time, the accelerator emits rays to start treatment, so as to achieve the purpose of precise treatment. This method often requires the treated patients to hold their breath for 40~ 60s, which is very, very difficult for patients with lung diseases themselves. There is also Elekta's 4D system, which is also used in accelerator therapy. The principle is to improve the beam output of the accelerator through computer algorithms. The disadvantage is that it does not measure, but calculates through an algorithm.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the prior art, to provide a real-time tumor location monitoring system and its monitoring system with compact structure, more accurate tracking of tumor movement caused by respiratory movement, providing favorable conditions for subsequent tumor treatment, and simple tracking method. method.

The object of the present invention is achieved through the following technical solutions: a real-time monitoring system for tumor position, which includes a respiration flow meter, a head MLC drive mechanism, and a PLC controller, and the respiration flow meter includes a flow meter body, and in the flow meter body There is a cavity, the top of the flow meter body is provided with an inlet pipe, and the left and right sides of the flow meter body are respectively provided with a horn pipe and an air outlet pipe. The horn pipe, air outlet pipe and air inlet pipe are all connected to the chamber. The air outlet pipe is provided with a flow meter, the end of the air outlet pipe is hinged with a first opening and closing door, the air inlet pipe is provided with a fan, and a second opening and closing door is hinged in the cavity and on the top wall of the cavity , the second opening and closing door is located below the intake pipe, and the MLC driving mechanism of the machine head includes two longitudinal guide rails, and two sliders that can slide along the longitudinal guide rails are arranged on the longitudinal guide rails. A transverse guide rail is arranged between two opposite guide sleeves, and an MLC is arranged between the two transverse guide rails, and the PLC controller is electrically connected to the flow meter and the fan.

The top of the air intake pipe is provided with a cover plate.

The cover plate is provided with a through hole communicating with the intake pipe.

The rotating shaft of the fan is rotatably installed on the cover plate.

The outside of the flow meter body is provided with a strap.

The MLC is composed of each pair of lead vanes that can move independently.

The method for real-time monitoring of the tumor location by the system comprises the following steps:

S1. The patient is strapped on the head with the horn tube facing the mouth and in tight contact;

S2. When exhaling, the gas enters the cavity through the trumpet tube, and the airflow blows to the second opening and closing door. The second opening and closing door rotates to the right around the hinge point under the action of air pressure, and the second opening and closing door closes the intake pipe; then the air Entering the air outlet pipe, the first opening and closing door rotates to the right around the hinge point under the action of air pressure, and the gas exhaled by the human body can be discharged. During the exhaust process, the flow meter measures the flow rate and converts the flow signal into an electrical signal and transmits it to the PLC control. The PLC controller calculates the patient's expiratory volume as X1 _; at the same time, the CX is used to scan the image of the patient's lungs to detect the longitudinal position _{Y1 of} the tumor in the lung when the expiratory volume is X1;

S3. When inhaling, a negative pressure is formed in the cavity, the first opening and closing door rotates to the left around the hinge point and is buckled on the outlet pipe, while the outside air enters the intake pipe, and the second opening and closing door is hinged around the hinge point under the action of air pressure Rotate the point to the left, the second opening and closing door opens, and the outside air flows through the cavity and the trumpet pipe in turn into the mouth; during the inhalation process, the fan rotates, and the fan converts the rotation signal into a signal and transmits it to the PLC controller, which is controlled by the PLC. Calculate the inspiratory volume X ₂ of the patient; at the same time, use CX to scan the image of the patient's lungs, and detect the longitudinal position Y _{2 of the tumor in the lung when the inspiratory volume is X 2 ;}

S4. Steps S2 to S3 are repeated repeatedly to detect the longitudinal position Y of the tumor in the lung at different respiratory volumes X, and draw a curve of X and Y;

S5. When tracking the tumor, put the patient to sleep on his back and make his lungs face the MLC; put the pneumometry on the patient to breathe, and detect the instantaneous respiratory volume at this time, and combine the graph in step S4 to find and instantaneous respiratory volume The longitudinal position of the tumor under equal respiratory volume, thus realizing the tracking of the lung tumor; after finding the tumor position, adjust the MLC position and the position of each multi-leaf grating, so that the contour formed by the multi-leaf grating is the same as the outer contour of the tumor.

The present invention has the following advantages: the present invention more accurately tracks the tumor movement caused by respiratory movement, provides favorable conditions for subsequent tumor treatment, and has a simple tracking method.

Description of drawings

Fig. 1 is a schematic structural diagram of a pneumo-flow meter;

Fig. 2 is a structural schematic diagram of the MLC driving mechanism of the machine head;

Fig. 3 is the front view of Fig. 2;

Fig. 4 is the operation flowchart of the present invention;

In the figure, 1-flow meter body, 2-cavity, 3-intake pipe, 4-horn pipe, 5-outlet pipe, 6-flow meter, 7-first opening and closing door, 8-fan, 9-second Opening and closing door, 10-longitudinal guide rail, 11-slider, 12-guide sleeve, 13-MLC, 14-cover plate, 15-banding, 16-multi-leaf grating, 17-transverse guide rail.

detailed description

The present invention will be further described below in conjunction with accompanying drawing, protection scope of the present invention is not limited to the following:

As shown in Figures 1 to 3, a tumor position real-time monitoring system includes a respiration flow meter, a machine head MLC drive mechanism and a PLC controller, the respiration flow meter includes a flow meter body 1, and the outside of the flow meter body 1 A strap 15 is provided, a cavity 2 is opened in the flow meter body 1, an air inlet pipe 3 is arranged on the top of the flow meter body 1, a horn tube 4 and an air outlet pipe 5 are respectively arranged on the left and right sides of the flow meter body 1, and the horn The pipe 4 is made of rubber material and can fit closely with the mouth. The trumpet pipe 4, the air outlet pipe 5 and the air inlet pipe 3 are all connected to the cavity 2. The air outlet pipe 5 is provided with a flow meter 6, and the air outlet pipe 5 is provided with a flow meter 6. The end of air pipe 5 is hinged with first opening and closing door 7, fan 8 is arranged in described air inlet pipe 3, and second opening and closing door 9 is hinged in cavity 2 and is positioned on the top wall of cavity 2, and the second Opening and closing door 9 is positioned at intake pipe 3 below.

As shown in Figures 2 to 3, the machine head MLC drive mechanism includes two longitudinal guide rails 10, and the longitudinal guide rails 10 are provided with two sliders 11 that can slide along the longitudinal guide rails 10, and the sliders 11 are provided with guide sleeves. 12. There is a transverse guide rail 17 between the two opposite guide sleeves 12. The transverse guide rail 17 can move left and right along the guide sleeve 12. An MLC13 is arranged between the two transverse guide rails 17. The MLC13 consists of each pair of independently movable The lead blades 16 are formed, and the PLC controller is electrically connected with the flow meter 6 and the fan 8 . The MLC 13 can move forward and backward along the longitudinal guide rail 10, and can also move left and right along the transverse guide rail 17, so as to ensure that the MLC can move with the tumor in real time.

The top of the air intake pipe 3 is provided with a cover plate 14, and the cover plate 14 is provided with a through hole communicating with the air intake pipe 3, so that outside air enters the air intake pipe 3 through the through hole. The rotating shaft of the fan 8 is rotatably mounted on the cover plate 14 .

The method for real-time monitoring of the tumor location by the system comprises the following steps:

S1. The patient is put on the head through the strap 15, and the trumpet tube 4 faces the mouth and is in tight contact;

S2. When exhaling, the gas enters the cavity 2 through the trumpet tube 4, and the airflow blows to the second opening and closing door 9, and the second opening and closing door 9 rotates to the right around the hinge point under the action of air pressure, and the second opening and closing door 9 Close the intake pipe 3 to prevent the exhaled gas from running out from the intake pipe 3, and read the amount of exhaled gas by the 6 flowmeter; then the gas enters the outlet pipe 5, and the first opening and closing door 7 is hinged around under the action of air pressure Rotate the point to the right, and the gas exhaled by the human body can be discharged. During the exhaust process, the flow meter 6 measures the flow rate and converts the flow signal into an electrical signal and transmits it to the PLC controller. The PLC controller calculates the patient's exhalation volume as X ₁ ; At the same time, CX is used to scan the patient's lungs to detect the longitudinal position Y _{1 of the tumor in the lung when the expiratory volume is X 1 ;}

S3. When inhaling, a negative pressure is formed in the cavity 2, and the first opening and closing door 7 rotates to the left around the hinge point and is fastened on the outlet pipe 5 to prevent outside air from entering through the outlet pipe 5, while outside air enters the intake pipe 3, the second opening and closing door 9 rotates to the left around the hinge point under the action of air pressure, the second opening and closing door is opened, and the external airflow enters the mouth through the cavity 2 and the trumpet tube 4 in sequence; during the suction process, the fan 8 Rotate, the fan 8 converts the rotation signal into a signal and transmits it to the PLC controller, and the PLC controller calculates the patient's inspiratory volume X ₂ ; at the same time, the CX is used to scan the image of the patient's lungs, and it is detected that the inspiratory volume is X ₂ , the longitudinal position Y ₂ of the tumor in the lung;

S4. Steps S2 to S3 are repeated repeatedly to detect the longitudinal position Y of the tumor in the lung at different respiratory volumes X, and draw a curve of X and Y;

S5. When tracking the tumor, put the patient to sleep on his back and make his lungs face the MLC13; put the pneumo-flow meter on the patient to breathe, and detect the instantaneous respiratory volume at this time, and combine the graph in step S4 to find and instantaneous respiratory volume The longitudinal position of the tumor under the same respiratory volume can realize the tracking of the lung tumor. Therefore, this monitoring method can more accurately track the tumor movement caused by respiratory movement and provide favorable conditions for subsequent tumor treatment. After the tumor location is found, the position of the MLC 13 and the positions of each multi-leaf collimator 16 are adjusted so that the contour formed by the multi-leaf collimator 16 is the same as the outer contour of the tumor.

Claims (7)

1. A tumor position real-time monitoring system, characterized in that: it includes a respiration flow meter, a head MLC drive mechanism and a PLC controller, and the respiration flow meter includes a flow meter body (1), a flow meter body (1) There is a cavity (2) inside, the top of the flow meter body (1) is provided with an air inlet pipe (3), and the left and right sides of the flow meter body (1) are respectively provided with a trumpet pipe (4) and an air outlet pipe (5) , the trumpet pipe (4), the air outlet pipe (5) and the air inlet pipe (3) are all connected to the cavity (2), the air outlet pipe (5) is provided with a flow meter (6), and the air outlet pipe ( The end of 5) is hinged with a first opening and closing door (7), the air intake pipe (3) is provided with a fan (8), and is hinged in the cavity (2) and on the top wall of the cavity (2) There is a second opening and closing door (9), and the second opening and closing door (9) is located under the intake pipe (3). The MLC driving mechanism of the machine head includes two longitudinal guide rails (10), and the longitudinal guide rails (10) are provided with There are two sliders (11) that can slide along the longitudinal guide rails (10), guide sleeves (12) are arranged on the sliders (11), and transverse guide rails (17) are arranged between the two opposite guide sleeves (12). ), an MLC (13) is arranged between the two transverse guide rails (17), and the PLC controller is electrically connected to the flow meter (6) and the fan (8). 2. A tumor location real-time monitoring system according to claim 1, characterized in that: a cover plate (14) is arranged on the top of the air intake pipe (3). 3. A tumor location real-time monitoring system according to claim 2, characterized in that: said cover plate (14) is provided with a through hole communicating with the air intake pipe (3). 4. A tumor location real-time monitoring system according to claim 1, characterized in that: the rotating shaft of the fan (8) is rotatably installed on the cover plate (14). 5 . The real-time monitoring system for tumor location according to claim 1 , characterized in that: a strap ( 15 ) is arranged outside the flow meter body ( 1 ). 6 . 6. A tumor location real-time monitoring system according to claim 1, characterized in that: said MLC (13) is composed of each pair of lead blades (16) that can move independently. 7. The method for system real-time monitoring of tumor location according to any one of claims 1 to 6, characterized in that: it comprises the following steps: S1. The patient is put on the head by the strap (15), and the trumpet tube (4) faces the mouth and is in tight contact; S2. When exhaling, the gas enters the cavity (2) through the trumpet tube (4), and the airflow blows to the second opening and closing door (9), and the second opening and closing door (9) turns to the right around the hinge point under the action of air pressure Rotate, the second opening and closing door (9) closes the intake pipe (3); then the gas enters the outlet pipe (5), the first opening and closing door (7) rotates to the right around the hinge point under the action of air pressure, and the gas exhaled by the human body During the exhaust process, the flow meter (6) measures the flow rate and converts the flow signal into an electrical signal and transmits it to the PLC controller. The PLC controller calculates the patient's expiratory volume as X ₁ ; An image scan of the lungs is performed to detect the longitudinal position _{Y1 of} the tumor in the lungs when the expiratory volume is X1; S3. When inhaling, negative pressure is formed in the cavity (2), the first opening and closing door (7) rotates to the left around the hinge point and buckles on the outlet pipe (5), and the outside air enters the intake pipe (3) Inside, the second opening and closing door (9) rotates to the left around the hinge point under the action of air pressure, the second opening and closing door opens, and the outside air flows through the cavity (2) and the horn tube (4) into the mouth in sequence; During the process, the fan (8) rotates, and the fan (8) converts the rotation signal into a signal and transmits it to the PLC controller. The PLC controller calculates the patient's inspiratory volume X ₂ ; Detect the longitudinal position Y _{2 of the tumor in the lung when the inspiratory volume is X 2 ;} S4. Steps S2 to S3 are repeated repeatedly to detect the longitudinal position Y of the tumor in the lung at different respiratory volumes X, and draw a curve of X and Y; S5. When tracking the tumor, put the patient to sleep on his back with his lungs facing the MLC (13); put the pneumometry on the patient for breathing, and at this time detect the instantaneous respiratory volume, and combine it with the curve in step S4 to find the The longitudinal position of the tumor under the respiratory volume equal to the instantaneous respiratory volume, so as to realize the tracking of the lung tumor; after finding the tumor position, adjust the position of the MLC (13) and adjust the position of each multi-leaf grating (16), so that the multi-leaf grating ( 16) The contour formed is the same as the outer contour of the tumor.