CN114098809B - Ultrasonic diagnostic apparatus transmitting system and rapid optimizing method thereof - Google Patents
Ultrasonic diagnostic apparatus transmitting system and rapid optimizing method thereof Download PDFInfo
- Publication number
- CN114098809B CN114098809B CN202111436223.9A CN202111436223A CN114098809B CN 114098809 B CN114098809 B CN 114098809B CN 202111436223 A CN202111436223 A CN 202111436223A CN 114098809 B CN114098809 B CN 114098809B
- Authority
- CN
- China
- Prior art keywords
- transmitting
- unit
- array
- sound field
- probe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/54—Control of the diagnostic device
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/58—Testing, adjusting or calibrating the diagnostic device
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Biophysics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Pathology (AREA)
- Radiology & Medical Imaging (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention relates to the technical field of sound field test, in particular to an ultrasonic diagnostic apparatus transmitting system and a rapid optimizing method thereof; comprising the following steps: the device comprises a control unit, a transmitting unit, an array probe and a sound field measuring device; the control unit is electrically connected with the emission unit, the array probe and the sound field measuring device in sequence, and the sound field measuring device is electrically connected with the control unit; the transmitting unit includes: a parameter setting unit and a transmission channel circuit; wherein the parameter setting unit includes: the system can solve the problem of matching between an ultrasonic diagnostic apparatus transmitting circuit and various array probes with different electroacoustic performances, automatically debug and optimize to obtain the optimal transmitting state of the system, particularly to realize the multi-focus requirement on a transmitting system (with probes), and ensure to obtain the optimal beam focusing performance and acoustic output characteristics.
Description
Technical Field
The invention relates to the technical field of medical electronic scanning ultrasonic diagnostic apparatuses, in particular to an ultrasonic diagnostic apparatus transmitting system and a rapid optimizing method thereof.
Background
An electronic scanning ultrasonic diagnostic apparatus is essentially a medical device that performs processing, display and imaging by transmitting an ultrasonic beam into a human body, and receiving ultrasonic waves reflected from human tissue. Specifically, the ultrasonic wave is converted into ultrasonic wave by the probe by adopting the transmitted pulse electric signal, the ultrasonic wave enters human tissues, ultrasonic reflected waves are generated due to different acoustic impedances of the human tissues, and the ultrasonic reflected waves are converted into tissue echo signals by the probe energy so as to process and display. In order to ensure the image quality, a multichannel pulse circuit is generally adopted, a multi-array element high-density probe is matched, and very fine emitted ultrasonic beams are generated on a certain scanning section and are scanned in a certain mode. The scan beam line spacing and the transmit ultrasonic pulse beam width must be closely matched to achieve the best results. The stronger the transmitting signal is, the higher the signal-to-noise ratio is, but in human body application, the requirement of safe use is also considered, the GB9706.9 has definite regulation on the acoustic output of the ultrasonic diagnostic apparatus, and for this purpose, the multi-channel transmitting circuit is automatically optimized to be matched with various array probes in an acoustic way, and the generation of the optimal acoustic wave beam is one of the current main design work on the premise of not exceeding the requirement of acoustic output.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an ultrasonic diagnostic apparatus transmitting system and a rapid optimizing method thereof, the system can solve the matching problem of an ultrasonic diagnostic apparatus transmitting circuit and various array probes (electric matching and acoustic matching) with different electroacoustic performances, automatically debug and optimize to obtain the optimal transmitting state of the system, particularly, the system is required to realize multi-focus requirements in the transmitting system (with probes), so as to ensure that the optimal beam focusing performance and acoustic output characteristics are obtained, and simultaneously, the system is ensured to meet the GB9706.9 acoustic output requirements at the beginning of system design, and high-quality original data is provided for various subsequent received signal processing.
The invention is realized by the following technical scheme:
an ultrasonic diagnostic device transmission system comprising: the device comprises a control unit, a transmitting unit, an array probe and a sound field measuring device; the control unit is electrically connected with the emission unit, the array probe and the sound field measuring device in sequence, and the sound field measuring device is electrically connected with the control unit;
the transmitting unit includes: a parameter setting unit and a transmission channel circuit; wherein the parameter setting unit includes: an array element delay time correction unit, an array compensation and weighting unit and a pulse waveform and base width setting unit;
When the transmitting system is used, the pulse waveform and bottom width setting unit, the array compensation and weighting unit and the array element delay time correction unit which are electrically stimulated are used as independent variables, the actual measured value of the pulse sound field is generated as the dependent variable, the automatic control and optimization are carried out, the final acoustic matching of the transmitting system and the array probe is ensured to reach the optimal state, the optimal transmitting ultrasonic focusing characteristic is obtained, meanwhile, the electroacoustic performance of the probe influencing the transmitting result is corrected by the preset value in the transmitting system, and the final generated pulse sound field is ensured to have the optimal response and focusing characteristic.
Preferably, the sound field measuring apparatus includes: the device comprises a water tank, a front hydrophone, a sound field testing and calculating unit and an interface unit.
Preferably, the transmitting unit further comprises a high voltage generator.
Preferably, electroacoustic performance of the array probe includes, but is not limited to, sensitivity uniformity and phase uniformity.
Preferably, the method further comprises the following steps:
A control unit is set in the ultrasonic diagnostic apparatus, the control unit combines electroacoustic parameters of the array probe to perform precompensation setting, design parameters are downloaded to the transmitting unit, meanwhile, the control unit transmits measurement commands to the pulse sound field measurement setting through a USB interface unit to test the pulse sound field of the system, the tested data are transmitted to the control unit through the USB interface unit to evaluate, the transmitting design parameters are modified through the parameter setting unit, and the reciprocating measurement and channel signal compensation are performed for many times until the pulse sound field data reach the optimal purpose.
The invention also provides the following technical scheme: the rapid optimization method of the ultrasonic diagnostic apparatus transmitting system comprises the following steps:
According to the system design, the electroacoustic parameters and the geometric parameters of the array probe are combined, transmitting parameters are established and designed for a parameter setting unit, the parameter setting unit transmits the transmitting parameters to a transmitting channel circuit, the transmitting channel circuit adds an array pulse signal to the array probe, and the array probe transmits a synthesized pulse ultrasonic beam to a test water tank;
The control unit gives a test command to the sound field tester, returns to the focus position after the test is automatically completed, and transmits test data to the control unit;
the control unit adjusts the transmitting parameters according to the test data, transmits ultrasonic pulse beams to the parameter setting unit, and finds the optimal parameters of the transmitting system of the ultrasonic diagnostic apparatus through N times of repeated operation of the process by sound field test, and automatically configures the transmitting system, and verifies the sound field test, thereby achieving the purpose of automatically optimizing the transmitting system.
The beneficial effects of the invention are as follows:
The system of the invention can solve the problem of matching between the transmitting circuit of the ultrasonic diagnostic apparatus and various array probes with different electroacoustic performances, automatically debug and optimize to obtain the optimal transmitting state of the system, particularly, the system is required to realize multi-focus requirements in a transmitting system (with probes), so as to ensure that the optimal beam focusing performance and acoustic output characteristics are obtained, and simultaneously ensure that the system meets the GB9706.9 acoustic output requirements at the beginning of system design, and also provide high-quality original data for various subsequent processing of received signals.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a circuit block diagram of the present invention;
FIG. 2 is a control block diagram of a pulse transmitting circuit in the present invention;
Fig. 3 is a flow chart of the system of the present invention.
In the figure: the device comprises a 1-control unit, a 2-transmitting unit, a 21-parameter setting unit, a 211-array element delay time correction unit, a 212-array compensation and weighting unit, a 213-pulse waveform and bottom width setting unit, a 22-transmitting channel circuit, a 23-high voltage generator, a 3-array probe, a 4-sound field measuring device, a 41-water tank and hydrophone with front, a 42-sound field testing and calculating unit and a 43-interface unit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
Referring to fig. 1 to 3, the embodiment specifically discloses a technical scheme of an ultrasonic diagnostic apparatus transmitting system, which includes: a control unit 1, a transmitting unit 2, an array probe 3 and an acoustic field measuring device 4; the control unit 1 is electrically connected with the transmitting unit 2, the array probe 3 and the sound field measuring device 4 in sequence, and the sound field measuring device 4 is electrically connected with the control unit 1;
the transmitting unit 2 includes: a parameter setting unit 21 and a transmission channel circuit 22; wherein the parameter setting unit 21 includes: an array element delay time correction unit 211, an array compensation and weighting unit 212, and a pulse waveform and base width setting unit 213; while the transmitting unit 2 controls the array probe 3 through a probe control switch.
When the transmitting system is used, the pulse waveform and bottom width setting unit 213, the array compensation and weighting unit 212 and the array element delay time correction unit 211 which are electrically stimulated are used as independent variables, the actual measurement value of the pulse sound field is generated as the dependent variable, the automatic control and optimization are carried out, the final acoustic matching of the transmitting system and the array probe 3 is ensured to reach the optimal state, the optimal transmitting ultrasonic focusing characteristic is obtained, the electroacoustic performance of the probe influencing the transmitting result is corrected by a preset value in the transmitting system, and the final generated pulse sound field is ensured to have the optimal response and focusing characteristic.
Specifically, the sound field measuring apparatus 4 includes: a water tank and a front hydrophone 41, a sound field testing and calculating unit 42 and an interface unit 43.
In particular, the transmitting unit 2 further comprises a high voltage generator 23.
In particular, electroacoustic performance of the array probe 3 includes, but is not limited to, sensitivity uniformity and phase uniformity.
Specifically, the method further comprises the following steps:
In the ultrasonic diagnostic apparatus, a control unit 1 is set up, the control unit 1 combines electroacoustic parameters of an array probe 3 to perform precompensation setting, design parameters are downloaded to a transmitting unit 2, meanwhile, the control unit 1 issues a measurement command for pulse sound field measurement setting through a USB interface unit 43, a pulse sound field of a system is tested, data after the test is transmitted to the control unit 1 through the USB interface unit 43 for evaluation, the transmitting design parameters are modified through a parameter setting unit 21, and round trip measurement and channel signal compensation are performed for a plurality of times until the pulse sound field data achieves the optimal purpose.
The embodiment also provides the following technical scheme: the rapid optimization method of the ultrasonic diagnostic apparatus transmitting system comprises the following steps:
According to the system design, combining electroacoustic parameters and probe geometric parameters of the array probe 3, establishing and designing emission parameters to a parameter setting unit 21, enabling the parameter setting unit 21 to give the emission parameters to an emission channel circuit 22, enabling the emission channel circuit 22 to add an array pulse signal to the array probe 3, and enabling the array probe 3 to emit a synthesized pulse ultrasonic beam to a test water tank;
The control unit 1 gives a test command to the sound field tester, returns to the focus position after the test is automatically completed, and transmits test data to the control unit 1;
The control unit 1 adjusts the emission parameters according to the test data, gives the parameter setting unit 21 the above-mentioned process is repeated, emits ultrasonic pulse wave beams, and after sound field test, the above-mentioned process is repeatedly operated for N times, the optimum parameters of the ultrasonic diagnostic apparatus emission system are found, and the emission system configuration is automatically carried out, and the sound field test verification is carried out, so as to achieve the purpose of automatically optimizing the emission system.
The embodiment further includes a system operation flow, and specifically referring to fig. 3.
The invention aims at the actual test of the ultrasonic diagnostic apparatus transmitting pulse sound field, and automatically sets, tests and corrects transmitting parameters by correlating transmitting pulse width, the number of transmitting probe array elements, the weighting coefficient of the probe array, delay focusing time of the probe array, electroacoustic performance of the probe with beam focusing width of acoustic output parameters, acoustic working frequency, sound pressure characteristics at a focus point and safety indexes, thereby finally achieving the purpose of rapidly optimizing the ultrasonic diagnostic apparatus transmitting system. The method and the device for determining the optimal setting can be suitable for optimizing the transmitting system of the complex ultrasonic diagnostic apparatus matched with various probes. Especially for multi-focus even whole-course focusing transmitting system, the aim of quick optimization is realized.
The pulse shape and pulse width are properly transmitted, so that the system achieves the optimal probe transmitting efficiency and response. The method is involved in the correction of the array element number and the array element delay time, and the electroacoustic performance compensation of the probe directly influences the focusing characteristic and the beam bandwidth of sound waves emitted by the probe, and has influence on the near-field focusing characteristic, the middle-field focusing characteristic and the far-field focusing characteristic of a sound field. The system multifocal setting optimization meets the practical use requirements of the system.
The simulation results of the single-parameter experiment of this example are shown in the following table:
the method for optimizing the self-adjusting transmitting system through the sound field detection result comprises the following steps: the ultrasonic diagnostic instrument is matched with a high-frequency probe with the nominal 7.8 MHz, the emission base width is changed, and the result shows that the ultrasonic diagnostic instrument emits the pulse with the base width of 0.13 microsecond through sound field test, and the electroacoustic performance is optimal.
The system of the invention can solve the problem of matching between the transmitting circuit of the ultrasonic diagnostic apparatus and various array probes 3 with different electroacoustic performances, automatically debug and optimize to obtain the optimal transmitting state of the system, particularly, the system is required to realize multi-focus requirements on the transmitting system with the probes, so as to ensure that the optimal beam focusing performance and acoustic output characteristics are obtained, and simultaneously ensure that the system meets the GB9706.9 acoustic output requirements at the beginning of system design, and also provide high-quality original data for various subsequent processing of received signals.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (1)
1. An ultrasonic diagnostic device transmission system, comprising: the device comprises a control unit (1), a transmitting unit (2), an array probe (3) and an acoustic field measuring device (4); the control unit (1) is electrically connected with the transmitting unit (2), the array probe (3) and the sound field measuring device (4) in sequence, and the sound field measuring device (4) is electrically connected with the control unit (1);
The transmitting unit (2) comprises: a parameter setting unit (21) and a transmission channel circuit (22); wherein the parameter setting unit (21) comprises: an array element delay time correction unit (211), an array compensation and weighting unit (212), and a pulse waveform and bottom width setting unit (213);
When the transmitting system is used, the pulse waveform and bottom width setting unit (213), the array compensation and weighting unit (212) and the array element delay time correction unit (211) which are electrically stimulated are used as independent variables, the actual measurement value of the pulse sound field is generated as the dependent variable, the automatic control and optimization are carried out, the final acoustic matching of the transmitting system and the array probe (3) is ensured to reach the optimal state, the optimal transmitting ultrasonic focusing characteristic is obtained, the electroacoustic performance of the probe influencing the transmitting result is corrected at the same time, and the optimal response and focusing characteristic of the finally generated pulse sound field are ensured;
The sound field measurement device (4) includes: a water tank, a hydrophone with a front end (41), a sound field testing and calculating unit (42) and an interface unit (43);
The transmitting unit (2) further comprises a high voltage generator (23);
electroacoustic properties of the array probe (3) include, but are not limited to, sensitivity consistency and phase consistency;
The rapid optimization method of the ultrasonic diagnostic apparatus transmitting system comprises the following steps:
according to the system design, combining electroacoustic parameters and probe geometric parameters of the array probe (3), establishing and designing emission parameters to a parameter setting unit (21), enabling the parameter setting unit (21) to transmit the emission parameters to an emission channel circuit (22), enabling the emission channel circuit (22) to apply an array pulse signal to the array probe (3), and enabling the array probe (3) to emit a synthesized pulse ultrasonic beam to a test water tank;
The control unit (1) gives a test command to the sound field tester, returns to the focus position after the test is automatically completed, and transmits test data to the control unit (1);
The control unit (1) adjusts the emission parameters according to the test data, gives the parameter setting unit (21) the steps, emits ultrasonic pulse beams, finds the optimal parameters of the ultrasonic diagnostic apparatus emission system through N times of repeated operation of the steps after sound field test, and automatically carries out emission system configuration, sound field test verification, thereby achieving the purpose of automatically optimizing the emission system;
the method is based on the actual test of the ultrasonic diagnostic apparatus transmitting pulse sound field, and the transmitting pulse width, the number of transmitting probe array elements, the weighting coefficient of the probe array, the delay focusing time of the probe array, the electroacoustic performance of the probe, the beam focusing width of acoustic output parameters, the acoustic working frequency, the sound pressure characteristic at the focus and the safety index are correlated to automatically set the transmitting parameters, thereby finally achieving the purpose of rapidly optimizing the ultrasonic diagnostic apparatus transmitting system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111436223.9A CN114098809B (en) | 2021-11-29 | 2021-11-29 | Ultrasonic diagnostic apparatus transmitting system and rapid optimizing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111436223.9A CN114098809B (en) | 2021-11-29 | 2021-11-29 | Ultrasonic diagnostic apparatus transmitting system and rapid optimizing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114098809A CN114098809A (en) | 2022-03-01 |
| CN114098809B true CN114098809B (en) | 2024-07-12 |
Family
ID=80367711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111436223.9A Active CN114098809B (en) | 2021-11-29 | 2021-11-29 | Ultrasonic diagnostic apparatus transmitting system and rapid optimizing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114098809B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102028499A (en) * | 2010-12-24 | 2011-04-27 | 飞依诺科技(苏州)有限公司 | Ultrasonic probe adaptive imaging system |
| CN107328866A (en) * | 2017-02-27 | 2017-11-07 | 陕西师范大学 | A kind of reparation bearing calibration of ultrasonic phase array linear transducer array |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6060838A (en) * | 1983-09-13 | 1985-04-08 | 富士通株式会社 | Ultrasonic sound field observing apparatus |
| JP2006234665A (en) * | 2005-02-25 | 2006-09-07 | Hitachi Kenki Fine Tech Co Ltd | Ultrasonic inspection device |
| CN101190133B (en) * | 2006-11-28 | 2011-05-18 | 深圳迈瑞生物医疗电子股份有限公司 | Method and device for transmitting wide wave beam in ultrasound wave diagnosis system |
| CN102151151B (en) * | 2011-04-14 | 2012-09-26 | 武汉超信电子工程有限公司 | Ultrasonic diagnostic apparatus with function of correcting machine parameters |
| JP6793444B2 (en) * | 2014-05-08 | 2020-12-02 | キヤノンメディカルシステムズ株式会社 | Ultrasonic diagnostic equipment |
| CN104997533B (en) * | 2015-06-23 | 2017-11-14 | 武汉超信电子工程有限公司 | Ultrasonic probe geometric parameter auto-correction method and device |
-
2021
- 2021-11-29 CN CN202111436223.9A patent/CN114098809B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102028499A (en) * | 2010-12-24 | 2011-04-27 | 飞依诺科技(苏州)有限公司 | Ultrasonic probe adaptive imaging system |
| CN107328866A (en) * | 2017-02-27 | 2017-11-07 | 陕西师范大学 | A kind of reparation bearing calibration of ultrasonic phase array linear transducer array |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114098809A (en) | 2022-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Preston et al. | Calibration of medical ultrasonic equipment-procedures and accuracy assessment | |
| CN106333707B (en) | Ultrasonic Doppler spectrum correction method and device and ultrasonic diagnosis system | |
| US4434648A (en) | Electroacoustic transducer calibration method and apparatus | |
| JP2013039388A (en) | Broad-beam imaging | |
| CN101966088A (en) | Oral cavity comprehensive detecting method and apparatus based on flexible phase controlled ultrasonic array | |
| JP2014535034A (en) | Device for non-destructive inspection of a test object by ultrasound, method for operating such a device, and method for non-destructive inspection of a test object by ultrasound | |
| JP2021500134A (en) | Ultrasonic probe transducer test | |
| CN113899947A (en) | Method and system for acquiring resonant frequency and calibrating power of ultrasonic transducer | |
| JP2002159492A (en) | Ultrasonic diagnostic equipment and element testing method | |
| Reid | Self‐reciprocity calibration of echo‐ranging transducers | |
| CN114098809B (en) | Ultrasonic diagnostic apparatus transmitting system and rapid optimizing method thereof | |
| US11112387B2 (en) | Method and system for measuring a wideband loop sensitivity for an acoustic transducer | |
| JP2611084B2 (en) | How to select an ultrasonic probe | |
| EP3505926B1 (en) | Method and system for determining an optimum drive signal for an acoustic transducer | |
| US20060149148A1 (en) | Method for deciding opening of ultrasonographic device | |
| US10768286B2 (en) | Method and system for measuring a characteristic loop sensitivity for an acoustic transducer | |
| Шпак et al. | Experimental investigation on the effective radiating area of ultrasonic transducers with the aim of increasing the reproduction accuracy of the unit of ultrasonic pressure in water | |
| CN111812622A (en) | Ultrasonic probe bandwidth detection method and system based on lens echo | |
| KR100530672B1 (en) | Phased array ultrasonic inspection apparatus having controlling means for focusing parameters | |
| US20230338008A1 (en) | Ultrasound imaging apparatus and signal processing method | |
| Hu et al. | Directivity and effective diameter measurement method of the hydrophone in ultrasound field | |
| US20240138681A1 (en) | Acoustic imaging and measurements using windowed nonlinear frequency modulation chirp | |
| CN113296084B (en) | Method and system for evaluating axial resolution of ultrasonic probe based on lens echo | |
| Wilkens | A thermal technique for local ultrasound intensity measurement: Part 2. Application to exposimetry on a medical diagnostic device | |
| JP4647864B2 (en) | Ultrasonic imaging apparatus and measuring method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |