CN113295777B - Method and system for improving harmonic imaging performance based on lens echo - Google Patents
Method and system for improving harmonic imaging performance based on lens echo Download PDFInfo
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Abstract
The invention belongs to the technical field of ultrasonic imaging, and particularly relates to a method for improving harmonic imaging performance based on lens echo, which comprises the following steps: s1, preprocessing an ultrasonic probe; s2, transmitting according to each array element imaged by ultrasonic pulse coding and each group of transmitting phase waveforms by operating ultrasonic equipment, and recording a lens echo; s3, evaluating echo amplitude parameters through an algorithm according to the lens echo, and traversing all array elements imaged by ultrasonic pulse coding and all emission phase waveforms to complete a calibration process; s4, according to the calibrated emission waveform, reading echo amplitude parameters corresponding to each array element of the ultrasonic probe, and controlling emission gain parameters by using the echo amplitude parameters so as to realize a working process; according to the invention, by acquiring the amplitude characteristics of the transmitting signals of different phase codes and accumulating the self-adaptive adjustment coefficients in the operation process, the optimal fundamental wave offset result can be acquired, so that the harmonic imaging quality is improved.
Description
Technical Field
The invention belongs to the technical field of ultrasonic imaging, and particularly relates to a method and a system for improving harmonic imaging performance based on lens echo.
Background
The detection of the internal structure of an object by ultrasonic imaging is widely used in the fields of medicine, nondestructive inspection, and the like. In the medical imaging field, ultrasound imaging is widely used for examination of parenchymal organs because of the lack of ionizing lesions. In various ultrasonic imaging modes, harmonic imaging provides better resolution, and is a basic working mode of ultrasonic two-dimensional imaging; one of the main methods for realizing harmonic imaging is to adopt an ultrasonic pulse coding imaging mode, wherein the ultrasonic pulse coding imaging mode refers to that ultrasonic waves with different phase codes are transmitted on the same scanning line for a plurality of times, and the fundamental wave components in imaging signals are removed through receiving signal operation (accumulation operation) by utilizing the phase correlation characteristics, so that the intensity of harmonic signals is improved, and the contrast and resolution of images are improved. The most commonly used ultrasonic pulse coding imaging is positive and negative harmonic coding, and a pair of signals with opposite phases are respectively transmitted and respectively marked as "+phase" and "+phase", the received signals are directly added to counteract fundamental waves, and only harmonic components are reserved. The principle is as follows:
assuming a transmit waveform of e (t), the ultrasound echo signal may be represented as:
x(t)＝x odd (t)+x even (t)； (1)
wherein x is odd (t) and x even (t) each represents a fundamental component and a harmonic component of the echo signal x (t),
representing the system response of the ultrasound system to the tissue, namely:
wherein, the liquid crystal display device comprises a liquid crystal display device,
and->
Representing the response of the ultrasound system and tissue, respectively, to a transmit waveform, the transmit waveform being a positive pulse e p At (t), echo signal x p (t) is:
the transmitted waveform is a negative pulse e n At (t), echo signal x n (t) is:
due to e n (t)＝-e p (t), then formula (6) can be written as:
the combined type (5) and (6) can obtain the echo signal x after pulse inversion superposition s (t) is:
the echo signal after pulse inversion superposition no longer contains fundamental wave component x odd (t) the harmonic component is 2 times of the original harmonic component, thereby improving the contrast of the harmonic image.
As can be seen from equation (4), the ultrasound system responds
The response to positive and negative pulses determines the echo signal x after pulse inversion and superposition s A fundamental component in (t); when the pulse inversion performance of the ultrasonic system is satisfied +.>
When x is s The fundamental component of (t) is derived from tissue nonlinearity; when the pulse inversion performance of the ultrasonic system is satisfied +.>
When x is s The fundamental component of (t) increases, thereby reducing the harmonic image contrast and resolution.
As shown in fig. 1, a processing flow of an ultrasonic transmitting and receiving link is provided, and both ultrasonic transmitting and ultrasonic receiving in the ultrasonic imaging process adopt array probes; the specific transmitting process is to drive a plurality of array elements of an ultrasonic transducer with certain amplitude and delay, excitation sound waves generated by each array element are overlapped in space to obtain a set sound field of the current transmitting, and the receiving process is to overlap receiving echoes of the plurality of array elements according to certain delay and amplitude to obtain a target echo corresponding to the current transmitting.
The imaging mechanism of ultrasonic pulse coding imaging is similar to positive and negative harmonic coding, and the emission waveforms of different times are e i (t) the echo signals counteract fundamental wave components in the echo signals through accumulation operation, and harmonic wave components are reserved.
When an array probe is adopted, the emitted wave is contributed by all array elements participating in emission, and the value of each point is expressed by the formula (9):
wherein alpha is j Is the transmission gain of each channel, T ij Representing the transmission gain, V, of the jth element for the position of the ith point T Is the total emission voltage; t (T) ij 、V T Will have an effect on the signal amplitude before accumulation.
As shown in FIG. 2, a schematic diagram of the ultrasound transmitting section is shown, the ultrasound transmitting section most commonly being driven by a bi-directional switch, in particular by employing a pair of PN MOSFET switching tubes, if the internal resistance of the N-MOSFET is R N The internal resistance of the P-MOSFET is R P The impedance of the probe array element is R E The method comprises the steps of carrying out a first treatment on the surface of the Taking the positive and negative harmonic encoding method as an example,
the amplitude of the emission wave of "+ phase" is:
V+＝R E /(R N +R E )*V E (10)
the amplitude of the emitted wave of the "-phase" is:
V-＝R E /(R P +R E )*V E (11)
obviously, if R N And R is P Not equal, at the same V E The lower transmit waveform amplitude is different; due to the limitation of the manufacturing process, R of different array elements on one probe E Is different and R E Throughout the probeVariations in the life cycle of the head occur, which can lead to difficulties in pre-compensating for impedance variations of different array elements, as well as the same array element, throughout the life cycle.
The influence of the above factors on harmonic imaging is described by taking positive and negative harmonic coding as an example, and for positive and negative harmonic coding imaging, "+phase" and "-phase" are directly added in the accumulation operation stage; from formulae (10) and (11), the same V E Under the conditions that the emission voltages V+ and V-applied to the array elements are different, V+ and V-directly affect T ij Is a magnitude of (2); the ultrasonic received echo signal and the transmitted signal are directly related, which results in that "+phase" and "—phase" cannot be canceled after the summation operation, and the harmonic imaging quality is directly reduced.
In addition, since the external part of the general lens is contacted with the object to be measured through the couplant, no obvious lens echo is generated because the impedance of the acoustic lens is relatively close to the impedance of the object to be measured. In general, the transmit waveform is determined by the characteristics of the transmit drive circuit of the system, the transmit waveform, the transmit voltage, and the characteristics of the probe array elements, all of which directly result in a reduction in harmonic imaging quality. For this reason, improvements are needed to overcome the shortcomings in practical applications.
Disclosure of Invention
In view of the foregoing drawbacks and deficiencies of the prior art, it is an object of the present invention to at least address one or more of the problems of the prior art, in other words, to provide a method and system for improving harmonic imaging performance based on lens echo that meets one or more of the aforementioned needs.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
a method for improving harmonic imaging performance based on lens echo, comprising the steps of:
s1, preprocessing an ultrasonic probe;
s2, transmitting according to each array element imaged by ultrasonic pulse coding and each group of transmitting phase waveforms by operating ultrasonic equipment, and recording a lens echo;
s3, evaluating echo amplitude parameters through an algorithm according to the lens echo, and traversing all array elements imaged by ultrasonic pulse coding and all emission phase waveforms to complete a calibration process;
and S4, according to the calibrated transmitting waveform, reading echo amplitude parameters corresponding to each array element of the ultrasonic probe, and controlling transmitting gain parameters by utilizing the echo amplitude parameters so as to realize the working process.
As a preferable solution, the preprocessing of the ultrasonic probe in the step S1 specifically includes: and connecting the probe connector with the transducer, connecting the probe connector with the ultrasonic probe, and cleaning the surface of the transducer to be calibrated.
Preferably, the step S2 includes:
s21, reading an ith group of emission pulse waveforms imaged by ultrasonic pulse coding, wherein i=1-2;
s22, utilizing the ith group of emission pulse waveforms to independently emit excitation to each array element of the ultrasonic probe;
s23, recording the received echo, determining the position of the lens echo according to the parameters of the ultrasonic probe, and extracting the lens echo.
As a preferred solution, the step S3 specifically includes:
calculating the waveform in the unit time range of the lens echo to obtain the echo amplitude parameter of each array element of the current waveform; and traversing all array elements imaged by ultrasonic pulse coding and all emission phase waveforms to obtain echo amplitude parameters of all array elements of the current waveform.
Preferably, the algorithm evaluation includes a maximum method and an integral method.
Preferably, in the step S4, the sum of echo amplitude parameters corresponding to all the array elements currently transmitted and coded for each ultrasonic pulse is calculated, namely:
wherein f is the echo lens parameterA number; j=1 to M, M being the number of array elements currently participating in transmission; fSum 1 Corresponds to "+ phase" ultrasound echoes; fSum 2 Corresponding to "-phase" ultrasound echoes.
Preferably, the transmission gain parameters include a transmission voltage, a transmission gain of each channel of the ultrasonic probe, and transmission gains of array elements corresponding to different position points.
The invention also provides a system for improving harmonic imaging performance based on lens echo, comprising:
the pretreatment module is used for carrying out pretreatment on the ultrasonic probe;
the calibration module is used for transmitting according to each array element imaged by ultrasonic pulse coding and each group of transmitting phase waveforms by operating the ultrasonic equipment and recording lens echoes; evaluating echo amplitude parameters according to a lens echo through an algorithm, and traversing all array elements imaged by ultrasonic pulse coding and all emission phase waveforms to complete a calibration process;
and the working module is used for reading the echo amplitude parameter corresponding to each array element of the ultrasonic probe according to the calibrated transmitting waveform, and controlling the transmitting gain parameter by utilizing the echo amplitude parameter so as to realize the working process.
Preferably, the working module comprises a calculating module for calculating the sum of echo amplitude parameters corresponding to the current transmission of all array elements for each ultrasonic pulse code, namely:
wherein f is an echo lens parameter; j=1 to M, M being the number of array elements currently participating in transmission; fSum 1 Corresponds to "+ phase" ultrasound echoes; fSum 2 Corresponding to "-phase" ultrasound echoes.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, by acquiring the amplitude characteristics of the transmitting signals of different phase codes and accumulating the self-adaptive adjustment coefficients in the operation process, the optimal fundamental wave offset result can be acquired, so that the harmonic imaging quality is improved.
According to the invention, through acquiring the information of the transmitting signal of one channel array element driven by the current transmitting circuit under different excitation conditions, the corresponding parameter is extracted by using the information, and the transmitting voltage or the gain parameter of the receiving channel is adjusted through feedback, so that the receiving echoes with different phases meet the cancellation condition.
Drawings
Fig. 1 is a flow chart of the processing of an ultrasonic transmitting-receiving link in the background of the invention;
FIG. 2 is a schematic view of an ultrasound emitting portion in the background of the invention;
FIG. 3 is a flowchart illustrating a method for improving harmonic imaging performance based on lens echo according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of the structural composition of the transducer of the present invention;
FIG. 5 is a schematic diagram of a single array element receiving echo of the forward and reverse harmonic encoding of the present invention;
FIG. 6 is a flowchart showing the calibration and operation of a method for improving harmonic imaging performance based on lens echo according to the first embodiment of the present invention;
FIG. 7 is a flow chart of calibration of a method for improving harmonic imaging performance based on lens echo in accordance with a first embodiment of the present invention;
fig. 8 is a block diagram of a system for improving harmonic imaging performance based on lens echo according to a second embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
Embodiment one:
as shown in fig. 3, the present embodiment provides a method for improving harmonic imaging performance based on lens echo, which includes the following steps:
s1, preprocessing an ultrasonic probe;
s2, transmitting according to each array element imaged by ultrasonic pulse coding and each group of transmitting phase waveforms by operating ultrasonic equipment, and recording a lens echo;
s3, evaluating echo amplitude parameters through an algorithm, and traversing all array elements imaged by ultrasonic pulse coding and all emission phase waveforms to complete a calibration process;
and S4, according to the calibrated transmitting waveform, reading echo amplitude parameters corresponding to each array element of the ultrasonic probe, and controlling transmitting gain parameters by utilizing the echo amplitude parameters so as to realize the working process.
Specifically, the preprocessing of the ultrasonic probe in step S1 includes: and connecting the probe connector with the transducer, connecting the probe connector with the ultrasonic probe, and cleaning the surface of the transducer to be calibrated.
As shown in fig. 4, in this embodiment, an array element structure of the ultrasonic probe uses a piezoelectric wafer as a center, and has several matching layers upwards, and a lens (acoustic lens) is arranged on the outermost surface, so as to realize an acoustic focusing effect. Because the external part of a general lens is contacted with an object to be measured through a coupling agent, no obvious lens echo is generated because the impedance of the acoustic lens is relatively close to the impedance of the object to be measured, when the external part of the lens is directly air, obvious lens echo is generated because the acoustic impedance of the lens is large in difference with that of the air, and the lens echo is a waveform reflected by a transmitting waveform at a lens/air interface and is directly related to the transmitting waveform, so that the characteristic of the transmitting waveform is directly reflected; since the geometry of the probe does not change after production, the lens echo always occurs at a fixed (delayed) position of the received waveform.
As shown in fig. 5, signals of the lens echo part in the figure can be obtained through time shift by giving the received echo signals of an array element for the +phase and the-phase under the forward and backward harmonic coding imaging condition.
As shown in fig. 6, the ultrasound machine is started up, and whether the calibration condition is satisfied is first determined, specifically: calculating the current time and the time interval T of the last calibration, and executing the calibration process when T is larger than the calibration time interval set by the type of the probe; otherwise, the working process is entered.
The calibration process is specifically as follows: firstly, setting the current coding harmonic wave working mode as a positive and negative harmonic wave coding mode, and reading an ith group of emission pulse waveforms imaged by ultrasonic pulse coding, wherein i=1-2; traversing by adopting a mode of firstly array element direction and then waveform direction: transmitting excitation to each array element from the first array element to the last array element by using the i-th group of transmitting pulse waveforms; recording a received echo, determining the position of the lens echo according to the geometric parameters of the probe, and extracting the lens echo.
Carrying out algorithm evaluation on the waveform in the unit time range of the lens echo to obtain the echo amplitude parameter of each array element of the current waveform; and traversing all array elements imaged by ultrasonic pulse coding and all emission phase waveforms to obtain echo amplitude parameters of all array elements of the current waveform.
The echo amplitude parameter is a parameter f which can reflect the echo amplitude and is obtained through echo waveform calculation, the algorithm evaluation method can adopt a maximum value method, an integration method and other characteristic parameters within a certain time range, the time range generally adopts a first period, namely, a first waveform zero crossing point is found from the position of the lens echo, a second zero crossing point is found from the point, and the range between the two zero crossing points is the time range of algorithm calculation.
Specifically, the lens echo signal is set to a sequence of n sampling points as S i ，i＝1～n；
If the maximum method is used, f is calculated as follows:
f＝max(abs(S i )，i＝1～n)，i＝1～n； (12)
wherein abs (·) represents taking absolute value; max (·) represents the maximum value for the sequence.
If an integration method is used, f is calculated as follows:
after the verification is finished, the amplitude parameters of the echo of each array element for each group of emission waveform lens are acquired, and then the working process is carried out.
In the embodiment, a maximum value method is selected for calculation, and the maximum value is obtained for the signal in the first wave range of the lens echo according to the formula (12), so as to obtain an echo amplitude parameter; saving the value to a memory area (EEPROM) inside the probe; and traversing each set of pulse waveforms imaged by the ultrasonic pulse code.
As shown in FIG. 7, a procedure of calibrating the direction of the array element and then the direction of the transmit phase waveform is provided, in which the 1 st group of transmit phase waveforms T are selected 1 Then select 1 st array element E 1 By controlling the T for the transmitting circuit 1 Drive E 1 Recording a lens echo, and calculating an echo amplitude parameter; and traversing all array elements and all emission phase waveforms in sequence, thereby completing the standard process. The direction of traversing all array elements and the direction of all transmitting phase waveforms can be changed in order, and the calibration process is not affected.
The working process is as follows: the working process is the process of performing the normal imaging function by the ultrasound, and the corresponding parameters are adjusted by using the information recorded in the calibration process.
The echo amplitude parameter of each array element of the current waveform is read from a memory area (EEPROM) inside the probe, and the gain parameter of the signal before the accumulation operation, such as the transmitting voltage V, is influenced in the change type (9) by using the echo amplitude parameter control T Transmitting gain alpha j of each channel of the ultrasonic probe and transmitting gain T of array elements corresponding to different position points ij Etc.; the received echoes corresponding to the respective codes before accumulation are made to satisfy the optimum fundamental cancellation effect by feedback adjustment.
In this embodiment, the transmission gain of each array element is 1, the simplified summation of equation (9) is performed, and the sum of the echo amplitude parameters corresponding to the current transmission of all array elements for each ultrasonic pulse code is calculated as follows:
wherein j=1 to M, M is the number of array elements currently participating in transmission; fSum 1 Corresponds to "+ phase" ultrasound echoes; fSum 2 Corresponds to "-phase" ultrasound echoes; if the emission voltage of the "+ phase" is VT 1 Then the emission voltage of the "-phase" is set to (fSum 1 /fSum 2 )*VT 1 。
The received echoes corresponding to the respective codes before the accumulation operation are made to satisfy the optimum fundamental cancellation effect by feedback adjustment.
The execution frequency of the calibration process can be determined according to the degree of array element parameter change so as to ensure that the amplitude of the transmitted signal of different probes and the same probe in a period of time meets the requirement of ultrasonic pulse coding imaging, thereby improving the harmonic imaging quality.
Compared with the prior art, the embodiment has the following beneficial effects:
according to the method, parameters affecting the amplitude of the received echo are adjusted through calibration data feedback obtained in the calibration process, so that the harmonic imaging quality is improved; through periodic calibration, the influence of impedance change in the life cycle of the probe is eliminated, and the harmonic imaging performance in the whole life cycle is ensured to be unchanged; by calibrating the different probes individually, harmonic imaging can guarantee a constant harmonic imaging performance for each probe.
Embodiment two:
as shown in fig. 8, the present embodiment provides a system for improving harmonic imaging performance based on lens echo, including:
a preprocessing module 11 for preprocessing the ultrasonic probe;
a calibration module 12 for transmitting according to each array element and each group of transmitting phase waveforms imaged by ultrasonic pulse coding by operating the ultrasonic device and recording lens echoes; evaluating echo amplitude parameters according to a lens echo through an algorithm, and traversing all array elements imaged by ultrasonic pulse coding and all emission phase waveforms to complete a calibration process;
the working module 13 is configured to read echo amplitude parameters corresponding to each array element of the ultrasound probe according to the calibrated transmit waveform, and control transmit gain parameters by using the echo amplitude parameters, so as to implement a working process.
The working module 13 comprises a calculation module for calculating the sum of the echo amplitude parameters for each ultrasonic pulse code corresponding to all the elements currently transmitted, namely:
wherein f is an echo lens parameter; j=1 to M, M being the number of array elements currently participating in transmission; fSum 1 Corresponds to "+ phase" ultrasound echoes; fSum 2 Corresponding to "-phase" ultrasound echoes.
It should be noted that, the system for improving the harmonic imaging performance based on the lens echo in the present embodiment corresponds to the method in the first embodiment, and will not be described herein.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, through acquiring the information of the transmitting signal of one array element channel driven by the current transmitting circuit under different excitation conditions, the corresponding parameter is extracted by using the information, and the transmitting voltage or the gain parameter of the receiving channel is adjusted through feedback, so that the receiving echoes with different phases meet the cancellation condition.
According to the invention, by acquiring the amplitude characteristics of the transmitting signals of different phase codes and accumulating the self-adaptive adjustment coefficients in the operation process, the optimal fundamental wave offset result can be acquired, so that the harmonic imaging quality is improved.
The foregoing is only illustrative of the preferred embodiments and principles of the present invention, and changes in specific embodiments will occur to those skilled in the art upon consideration of the teachings provided herein, and such changes are intended to be included within the scope of the invention as defined by the claims.
Claims (3)
1. A method for improving harmonic imaging performance based on lens echo, comprising the steps of:
s1, preprocessing an ultrasonic probe;
s2, transmitting according to each array element imaged by ultrasonic pulse coding and each group of transmitting phase waveforms by operating ultrasonic equipment, and recording a lens echo;
s3, evaluating echo amplitude parameters through an algorithm according to the lens echo, and traversing all array elements imaged by ultrasonic pulse coding and all emission phase waveforms to complete a calibration process; the algorithm evaluation comprises a maximum value method and an integration method;
s4, according to the calibrated emission waveform, reading echo amplitude parameters corresponding to each array element of the ultrasonic probe, controlling emission gain parameters by utilizing the sum of all echo amplitude parameters, and enabling the received echo corresponding to each code before accumulation operation to meet the optimal fundamental wave cancellation effect through feedback adjustment so as to realize the working process; the transmitting gain parameters comprise transmitting voltage, transmitting gain of each channel of the ultrasonic probe and transmitting gain of array elements corresponding to different position points;
the step S2 includes:
s21, reading an ith group of emission pulse waveforms imaged by ultrasonic pulse coding, wherein i=1-2;
s22, utilizing the ith group of emission pulse waveforms to independently emit excitation to each array element of the ultrasonic probe;
s23, recording a received echo, determining the position of a lens echo according to parameters of an ultrasonic probe, and extracting the lens echo;
the step S3 specifically comprises the following steps:
calculating the waveform in the unit time range of the lens echo to obtain the echo amplitude parameter of each array element of the current waveform; traversing all array elements imaged by ultrasonic pulse coding and all emission phase waveforms to obtain echo amplitude parameters of all array elements of the current waveform;
in the step S4, the sum of the echo amplitude parameters of each ultrasonic pulse code corresponding to all the currently transmitted array elements is calculated, namely:
fSum i = 
，i=1~2；
wherein f is an echo lens parameter; j=1 to M, M being the number of array elements currently participating in transmission; fSum 1 Corresponds to "+ phase" ultrasound echoes; fSum 2 Corresponding to "-phase" ultrasound echoes.
2. The method for improving harmonic imaging performance based on lens echo according to claim 1, wherein the preprocessing of the ultrasonic probe in step S1 is specifically: and connecting the probe connector with the transducer, connecting the probe connector with the ultrasonic probe, and cleaning the surface of the transducer to be calibrated.
3. A lens echo based system for enhancing harmonic imaging performance for implementing a lens echo based method for enhancing harmonic imaging performance as claimed in any one of claims 1-2, wherein said lens echo based system for enhancing harmonic imaging performance comprises:
the pretreatment module is used for carrying out pretreatment on the ultrasonic probe;
the calibration module is used for transmitting according to each array element imaged by ultrasonic pulse coding and each group of transmitting phase waveforms by operating the ultrasonic equipment and recording lens echoes; evaluating echo amplitude parameters according to a lens echo through an algorithm, and traversing all array elements imaged by ultrasonic pulse coding and all emission phase waveforms to complete a calibration process; the algorithm evaluation comprises a maximum value method and an integration method; the calibration module is specifically as follows:
reading an ith group of emission pulse waveforms imaged by ultrasonic pulse coding, wherein i=1-2;
transmitting excitation to each array element of the ultrasonic probe by using the ith group of transmitting pulse waveform;
recording a received echo, determining the position of a lens echo according to parameters of an ultrasonic probe, and extracting the lens echo;
calculating the waveform in the unit time range of the lens echo to obtain the echo amplitude parameter of each array element of the current waveform; traversing all array elements imaged by ultrasonic pulse coding and all emission phase waveforms to obtain echo amplitude parameters of all array elements of the current waveform;
the working module is used for reading echo amplitude parameters corresponding to each array element of the ultrasonic probe according to the calibrated emission waveform, controlling emission gain parameters by utilizing the sum of all echo amplitude parameters, and enabling the received echo corresponding to each code before the accumulation operation to meet the optimal fundamental wave cancellation effect through feedback adjustment so as to realize the working process; the transmitting gain parameters comprise transmitting voltage, transmitting gain of each channel of the ultrasonic probe and transmitting gain of array elements corresponding to different position points;
the working module comprises a calculating module for calculating the sum of echo amplitude parameters corresponding to all the currently transmitted array elements for each ultrasonic pulse code, namely:
fSum i =
，i=1~2；
wherein f is an echo lens parameter; j=1 to M, M being the number of array elements currently participating in transmission; fSum 1 Corresponds to "+ phase" ultrasound echoes; fSum 2 Corresponding to "-phase" ultrasound echoes.
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| CN109069115A (en) * | 2017-06-06 | 2018-12-21 | 深圳迈瑞生物医疗电子股份有限公司 | A kind of method, apparatus and system being imaged in ultrasonic scanning |
| CN108957471A (en) * | 2018-06-22 | 2018-12-07 | 杭州电子科技大学 | Three-dimension measuring system based on FM-CW laser ranging |
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