CN113180726A - Frequency compounding method and system based on parallel wave beams - Google Patents
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Abstract
The invention discloses a frequency compounding method and a system based on parallel beams, wherein the related frequency compounding method based on the parallel beams comprises the following steps: s1, setting the number of scanning lines, parallel beams and the compounding times of the scanning lines of each frame in ultrasonic imaging, and determining the compounding frequency emitted by the scanning lines; s2, calculating the position of each emission of all scanning lines in the ultrasonic imaging according to the set information to obtain an emission sequence; s3, controlling the ultrasonic system to complete the first two times of emission according to the obtained emission sequence, and calculating frequency composite signals of scanning lines corresponding to the first two times of emission; and S4, continuing to execute the next emission, and calculating the frequency composite signal of the scanning line until the frequency composite of all the scanning lines is completed. The invention realizes high-frame frequency composite ultrasonic imaging by utilizing parallel beams, and solves the problem of low frame frequency of front-end frequency composite imaging.
Description
Technical Field
The invention relates to the technical field of frequency compounding, in particular to a frequency compounding method and system based on parallel beams.
Background
On the premise of ensuring the resolution of the image, frequency compounding is mainly used for improving the penetration of the ultrasonic image. The frequency compounding in ultrasonic imaging is divided into two modes of front-end frequency compounding and rear-end frequency compounding, namely:
1. back-end frequency compounding
The back-end frequency composite ultrasound imaging transmit sequence is the same as conventional ultrasound imaging, as shown in figure 1. All scan linesUsing the same transmission frequency f0The harmonic component caused by acoustic nonlinearity is utilized to compound the fundamental component and the harmonic component at a certain ratio at the receiving end.
The frequency participating in the compounding in the frequency compounding of the back end is only the fundamental frequency f0And harmonic frequency 2f0. If the frequency of transmission f0And if the frequency is larger, the fundamental frequency and harmonic frequency span are larger, so that the composite resolution of the rear-end frequency is reduced.
2. Front end frequency compounding
Different from the back-end frequency compounding, the front-end frequency compounding imaging transmits waveforms with different frequencies at the same scanning position, and two frequency components are compounded in an echo signal according to a certain ratio, so that the penetration of an image is improved on the premise of low resolution loss. Conventional ultrasound imaging, in which all scan lines use the same transmit frequency f, and a front-end frequency complex ultrasound imaging transmit sequence is shown in fig. 1 and 20The same scanning line in the front-end frequency composite imaging respectively adopts f0And f1The transmission frequency of (1). If a frame of ultrasound image is composed of N scan lines, a frame of image for conventional ultrasound imaging needs N transmissions, while front-end frequency complex imaging needs 2N transmissions. So that the front-end frequency composite frame rate is the conventional imaging frame rate
Which is not conducive to detection of fast moving tissue.
Compared with the back-end frequency composite imaging, the frequency participating in the composite in the front-end frequency composite imaging can be changed according to different imaging conditions, and the flexibility is higher. Especially in harmonic imaging, the front-end frequency composite imaging can obtain higher contrast. Therefore, high frame rate front-end frequency complex imaging is particularly important to achieve imaging of fast moving tissue. However, the front-end frequency compound imaging has the problem of low frame frequency, so the invention provides a frequency compound method and a frequency compound system based on parallel beams to solve the problem.
Disclosure of Invention
The invention aims to provide a frequency compounding method and a frequency compounding system based on parallel beams, aiming at the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a parallel beam based frequency compounding method, comprising:
s1, setting the number of scanning lines, parallel beams and the compounding times of the scanning lines of each frame in ultrasonic imaging, and determining the compounding frequency emitted by the scanning lines;
s2, calculating the position of each emission of all scanning lines in the ultrasonic imaging according to the set information to obtain an emission sequence;
s3, controlling the ultrasonic system to complete the first two times of emission according to the obtained emission sequence, and calculating frequency composite signals of scanning lines corresponding to the first two times of emission;
and S4, continuing to execute the next emission, and calculating the frequency composite signal of the scanning line until the frequency composite of all the scanning lines is completed.
Further, in the step S2, the position of each emission of all scan lines in the ultrasound imaging is calculated, which is expressed as:
wherein, eleN is the number of transducer array elements, and d is the transducer array element interval; n represents the number of scanning lines; m represents the number of parallel beams; c represents the number of compounding times; x is the number ofkIndicating the location of the k-th transmission.
Further, in step S3, a frequency composite signal of the scan line is calculated, which is expressed as:
wherein s (t) represents a signal obtained by frequency compounding of the scanning lines;
and
respectively representing the frequency of the scanning line as f0And a frequency of f1Corresponding echo signals during transmission; alpha and beta represent the frequency f in the frequency composite signal0And f1The specific gravity of (a) should satisfy the condition that α + β is 1.
Correspondingly, a frequency composite system based on parallel beams is also provided, which comprises:
the device comprises a setting module, a processing module and a processing module, wherein the setting module is used for setting the number of scanning lines, parallel beams and the compounding times of the scanning lines in each frame in ultrasonic imaging and determining the compounding frequency emitted by the scanning lines;
the first calculation module is used for calculating the transmitting positions of all scanning lines in the ultrasonic imaging according to the set information to obtain a transmitting sequence;
the second calculation module is used for controlling the ultrasonic system to finish the first two times of emission according to the obtained emission sequence and calculating the frequency composite signals of the scanning lines corresponding to the first two times of emission;
and the third calculating module is used for continuously executing the next emission and calculating the frequency composite signals of the scanning lines until the frequency composite of all the scanning lines is completed.
Further, the first calculation module calculates the position of each emission of all the scanning lines in the ultrasonic imaging, and the calculation is represented as:
wherein, eleN is the number of transducer array elements, and d is the transducer array element interval; n represents the number of scanning lines; m represents the number of parallel beams; c represents the number of compounding times; x is the number ofkIndicating the location of the k-th transmission.
Further, the second calculating module calculates a frequency composite signal of the scanning line, which is expressed as:
wherein s (t) represents a signal obtained by frequency compounding of the scanning lines;
and
respectively representing the frequency of the scanning line as f0And a frequency of f1Corresponding echo signals during transmission; alpha and beta represent the frequency f in the frequency composite signal0And f1The specific gravity of (a) should satisfy the condition that α + β is 1.
Compared with the prior art, the invention has the following beneficial effects:
1. improving the front-end frequency composite ultrasonic imaging frame frequency;
2. the scope of front-end frequency composite ultrasonic imaging is expanded, and a front-end frequency composite mode is applied to pulse inversion harmonic imaging or fast motion tissue imaging.
Drawings
FIG. 1 is a schematic diagram of a conventional ultrasound imaging transmit sequence provided in the background art;
FIG. 2 is a diagram of a front-end frequency composite ultrasound imaging transmit sequence provided by the background art;
fig. 3 is a flowchart of a parallel beam-based frequency compounding method according to an embodiment;
FIG. 4 is a diagram of a prior art ultrasound parallel beam imaging transmission sequence according to an embodiment;
fig. 5 is a schematic diagram of a parallel beam-based frequency composite transmission sequence according to an embodiment.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
The invention aims to provide a frequency compounding method and a frequency compounding system based on parallel beams, aiming at the defects of the prior art.
Example one
The frequency compounding method based on parallel beams provided by this embodiment, as shown in fig. 3, includes:
s1, setting the number of scanning lines, parallel beams and the compounding times of the scanning lines of each frame in ultrasonic imaging, and determining the compounding frequency emitted by the scanning lines;
s2, calculating the position of each emission of all scanning lines in the ultrasonic imaging according to the set information to obtain an emission sequence;
s3, controlling the ultrasonic system to complete the first two times of emission according to the obtained emission sequence, and calculating frequency composite signals of scanning lines corresponding to the first two times of emission;
and S4, continuing to execute the next emission, and calculating the frequency composite signal of the scanning line until the frequency composite of all the scanning lines is completed.
In ultrasound imaging, one common way to increase the imaging frame rate is the parallel beam technique; in the parallel beam technology, a plurality of scanning lines share one-time transmitting information, so that the transmitting times required by a single-frame image are reduced, and the imaging frame frequency is improved.
Because of the distribution limitation of the focused ultrasound emission sound field, in order to ensure the consistent echo intensity of each scanning line, the parallel beam ultrasound imaging is generally completed by adopting a parallel beam and scanning line composite mode, but in the prior art, each emission adopts the same emission frequency. Fig. 4 is a schematic diagram of an ultrasound parallel beam imaging transmission sequence. In the sequence of fig. 4, a 4-beam 2-combining mode is adopted, and the transmission frequencies of all the transmission lines are the same. The arrows indicate the emission, the thin black lines indicate the parallel beams corresponding to one emission, the thick black lines indicate the scan lines, tx _1_ f0 indicates the first emission, and the emission frequency is f0slnN indicates the nth scan line and the black dashed box indicates line recombination. The prior art still has the problem that the frame rate of the front-end frequency composite imaging is low.
The problem that this embodiment exists to prior art, borrows the parallel beam imaging principle of supersound for reference, and each transmission adopts different transmitting frequency, utilizes line complex can realize the compound ultrasonic imaging of front end frequency, can realize the ultrasonic imaging frame frequency promotion of different multiples.
Fig. 5 is a schematic diagram of a frequency composite transmission sequence based on parallel beams, wherein arrows represent transmission, thin black lines represent parallel beams corresponding to one-time transmission, thick black lines represent scanning lines, tx _1_ f0 represents first-time transmission, and the transmission frequency is f0slnN indicates the nth scan line and the black dashed box indicates line recombination.
In the embodiment, parallel beams are 2, the line compounding times are 2, and the same scanning line has two times of emission at different positions. The transmission frequencies of two adjacent transmissions are respectively f0And f1And repeating the steps in sequence until all the scanning lines of one frame of image are completed.
In step S1, the number of scanlines, parallel beams, and the number of scanline complexes for each frame in ultrasound imaging are set, and the complex frequency of scanline emissions is determined.
Firstly, setting the number of scanning lines in a single frame as N, parallel wave beams as 2 and the compounding times as 2, and determining the front-end compounding frequencies as f0And f1。
The composite number refers to the composite number of one scan line, and the composite number of other scan lines is set to 2 times except for the first and last scan lines.
In step S2, the position of each transmission of all scan lines in the ultrasound imaging is calculated according to the set information, resulting in a transmission sequence.
According to the preset number of scanning lines N, the number of parallel beams M and the composite times C, the position of each emission can be calculated, namely the k-th emission position is as follows:
where eleN is the number of transducer elements and d is the transducer element spacing.
When the positions of all the scan lines are calculated, the transmit sequence is set according to fig. 5.
In step S3, the ultrasound system is controlled to complete the first two transmissions according to the obtained transmission sequence, and the frequency composite signals of the scanning lines corresponding to the first two transmissions are calculated.
Controlling the ultrasonic system to perform the first two transmissions according to a set transmission sequence, wherein the first transmission is performed at a frequency f0Is transmitted on the basis of a frequency f1Transmitting on the basis of (1); because the 1 st scanning line is only compounded once and the 2 nd scanning line is compounded twice, as shown in fig. 5, the 1 st scanning line only has one line and the 2 nd scanning line has two lines; in practical cases, the frequency composite signals of two scan lines are obtained every two times of emission, so the present embodiment obtains the 1 st scan line and the 2 nd scan line frequency composite signals sln1 and sln 2.
The 1 st and 2 nd scan line frequency composite signals sln1 and sln2 are calculated, respectively, according to the following formula.
In the process of compounding the scanning lines, because the echo signals of the same scanning line come from two times of emission at different positions, and the frequencies of the two times of emission are different, the compounded signals are expressed as follows:
wherein s (t) represents a signal obtained by frequency compounding of the scanning lines;
and
respectively representing the frequency of the scanning line as f0And a frequency of f1Corresponding echo signals during transmission; alpha and beta represent the intermediate frequency of the frequency complex signalA rate of f0And f1The specific gravity of (a) should satisfy the condition that α + β is 1.
In step S4, the next transmission is continued, and the frequency composite signal of the scanning line is calculated until the frequency composite of all the scanning lines is completed.
And continuing to transmit for the next time, and finishing frequency composite signals of other scanning lines according to the formula until finishing frequency composite of all the scanning lines.
In the embodiment, the parallel beams are utilized to realize high-frame frequency composite ultrasonic imaging, so that the problem of low frame frequency of front-end frequency composite imaging is solved; the front-end frequency composite ultrasonic imaging frame frequency is improved; the scope of front-end frequency composite ultrasonic imaging is expanded, and a front-end frequency composite mode is applied to pulse inversion harmonic imaging or fast motion tissue imaging.
Example two
The embodiment provides a frequency composite system based on parallel beams, which includes:
the device comprises a setting module, a processing module and a processing module, wherein the setting module is used for setting the number of scanning lines, parallel beams and the compounding times of the scanning lines in each frame in ultrasonic imaging and determining the compounding frequency emitted by the scanning lines;
the first calculation module is used for calculating the transmitting positions of all scanning lines in the ultrasonic imaging according to the set information to obtain a transmitting sequence;
the second calculation module is used for controlling the ultrasonic system to finish the first two times of emission according to the obtained emission sequence and calculating the frequency composite signals of the scanning lines corresponding to the first two times of emission;
and the third calculating module is used for continuously executing the next emission and calculating the frequency composite signals of the scanning lines until the frequency composite of all the scanning lines is completed.
Further, the first calculation module calculates the position of each emission of all the scanning lines in the ultrasonic imaging, and the calculation is represented as:
wherein eleN is transducer arrayThe element number d is the transducer element interval; n represents the number of scanning lines; m represents the number of parallel beams; c represents the number of compounding times; x is the number ofkIndicating the location of the k-th transmission.
Further, the second calculating module calculates a frequency composite signal of the scanning line, which is expressed as:
wherein s (t) represents a signal obtained by frequency compounding of the scanning lines;
and
respectively representing the frequency of the scanning line as f0And a frequency of f1Corresponding echo signals during transmission; alpha and beta represent the frequency f in the frequency composite signal0And f1The specific gravity of (a) should satisfy the condition that α + β is 1.
It should be noted that, a frequency composite system based on parallel beams provided in this embodiment is similar to the embodiment, and will not be described herein again.
Compared with the prior art, the invention has the following beneficial effects:
1. improving the front-end frequency composite ultrasonic imaging frame frequency;
2. the scope of front-end frequency composite ultrasonic imaging is expanded, and a front-end frequency composite mode is applied to pulse inversion harmonic imaging or fast motion tissue imaging.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (6)
1. A method for frequency compounding based on parallel beams, comprising:
s1, setting the number of scanning lines, parallel beams and the compounding times of the scanning lines of each frame in ultrasonic imaging, and determining the compounding frequency emitted by the scanning lines;
s2, calculating the position of each emission of all scanning lines in the ultrasonic imaging according to the set information to obtain an emission sequence;
s3, controlling the ultrasonic system to complete the first two times of emission according to the obtained emission sequence, and calculating frequency composite signals of scanning lines corresponding to the first two times of emission;
and S4, continuing to execute the next emission, and calculating the frequency composite signal of the scanning line until the frequency composite of all the scanning lines is completed.
2. The parallel beam-based frequency compounding method of claim 1, wherein the position of each emission of all scan lines in ultrasound imaging is calculated in step S2 as follows:
wherein, eleN is the number of transducer array elements, and d is the transducer array element interval; n represents the number of scanning lines; m represents the number of parallel beams; c represents the number of compounding times; x is the number ofkIndicating the location of the k-th transmission.
3. The parallel beam-based frequency compounding method of claim 2, wherein the step S3 calculates a frequency compounding signal of the scan line, which is expressed as:
wherein s (t) represents a signal obtained by frequency compounding of the scanning lines;
and
respectively representing the frequency of the scanning line as f0And a frequency of f1Corresponding echo signals during transmission; alpha and beta represent the frequency f in the frequency composite signal0And f1The specific gravity of (a) should satisfy the condition that α + β is 1.
4. A parallel beam based frequency compounding system, comprising:
the device comprises a setting module, a processing module and a processing module, wherein the setting module is used for setting the number of scanning lines, parallel beams and the compounding times of the scanning lines in each frame in ultrasonic imaging and determining the compounding frequency emitted by the scanning lines;
the first calculation module is used for calculating the transmitting positions of all scanning lines in the ultrasonic imaging according to the set information to obtain a transmitting sequence;
the second calculation module is used for controlling the ultrasonic system to finish the first two times of emission according to the obtained emission sequence and calculating the frequency composite signals of the scanning lines corresponding to the first two times of emission;
and the third calculating module is used for continuously executing the next emission and calculating the frequency composite signals of the scanning lines until the frequency composite of all the scanning lines is completed.
5. The parallel beam based frequency compounding system of claim 4, wherein the first computing module computes the position of each emission of all scan lines in ultrasound imaging as:
wherein, eleN is the number of transducer array elements, and d is the transducer array element interval; n represents the number of scanning lines; m represents the number of parallel beams; c represents the number of compounding times; x is the number ofkIndicating the location of the k-th transmission.
6. The parallel beam based frequency compounding system of claim 5, wherein the second computing module computes a frequency compounding signal for a scan line as:
wherein s (t) represents a signal obtained by frequency compounding of the scanning lines;
and
respectively representing the frequency of the scanning line as f0And a frequency of f1Corresponding echo signals during transmission; alpha and beta represent the frequency f in the frequency composite signal0And f1The specific gravity of (a) should satisfy the condition that α + β is 1.
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