CN106037805B - Method and device for ultrasonic imaging - Google Patents
Method and device for ultrasonic imaging Download PDFInfo
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- CN106037805B CN106037805B CN201610487901.7A CN201610487901A CN106037805B CN 106037805 B CN106037805 B CN 106037805B CN 201610487901 A CN201610487901 A CN 201610487901A CN 106037805 B CN106037805 B CN 106037805B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4444—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device related to the probe
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4483—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4483—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer
- A61B8/4488—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer the transducer being a phased array
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/52—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/5207—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves involving processing of raw data to produce diagnostic data, e.g. for generating an image
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- Computer Vision & Pattern Recognition (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
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Abstract
The invention discloses an ultrasonic imaging method and a device thereof, wherein the method comprises the following steps: transmitting ultrasonic waves by controlling more than 2 array elements on the probe to form unfocused cylindrical waves; each cylindrical wave is respectively realized by more than 1 aperture, and the array elements in the current aperture are used for receiving echoes after the cylindrical wave is transmitted; and the echo is synthesized through an aperture to realize the transmission and reception of double point-by-point focusing images. The device comprises: array element control unit, cylindrical wave receiving unit and aperture synthesis unit. The ultrasonic imaging method provided by the invention can realize transmitting and receiving double point-by-point focusing images, so that the quality of an ultrasonic image is better, and particularly the uniformity of the ultrasonic image is obviously improved.
Description
Technical Field
the invention relates to the technical field of ultrasonic imaging.
Background
The basic principle of ultrasound imaging is: the ultrasonic equipment emits ultrasonic pulses to a human body by exciting an ultrasonic transducer, and the ultrasonic pulses are transmitted in a certain direction; according to the delay time of the echo, the distance and the property of the organism tissue can be judged according to the strength. The ultrasound image as understood by us is formed by processing with electronic circuitry and a computer.
currently, in the ultrasound imaging market, almost all products employ simultaneous excitation of multiple elements (typically over 32 channels), forming a focused single-direction transmit beam, and forming the strongest transmit signal at the transmit focal point. This transmit mode is generally capable of forming a good image at the transmit focal point, resulting in high resolution. However, far from the emission focus, the sound field may generate a divergence effect to cause the resolution of the image to be non-uniform, thereby affecting the imaging quality.
Disclosure of Invention
In view of the above, the present invention provides an ultrasound imaging method, which solves the problem of non-uniform resolution of an image, so that the quality of an ultrasound image is better, and particularly, the uniformity of the ultrasound image is significantly improved.
To achieve the above object, the present invention provides an ultrasound imaging method, comprising: transmitting ultrasonic waves by controlling more than 2 array elements on the probe to form unfocused cylindrical waves; each cylindrical wave is respectively realized by more than 1 aperture, and the array elements in the current aperture are used for receiving echoes after the cylindrical wave is transmitted; and the echo is synthesized through an aperture to realize the transmission and reception of double point-by-point focusing images.
Further, the control is to turn on or off the array elements respectively so that the transmission of the ultrasonic waves between the array elements is delayed and is a wave front to form a cylindrical wave.
further, the aperture synthesis reconstructing data obtained for the transmitted cylindrical wave and the received echo, comprising: each pixel point in the ultrasonic image is obtained by summing data sets formed by scanning the surface of the whole probe by horizontally moving the circle center position of the cylindrical wave; the sum of the transmit delay and the receive delay of data points in the data set is a constant.
Further, when the number of the array elements is odd, the center of the cylindrical wave is positioned at the center of the middle array element; when the number of the array elements is even, the center of the cylindrical wave is located at the midpoint between the two array elements in the middle.
further, the probe is a universal probe.
further, the array element is a material block divided on the probe.
Furthermore, the probe is one or more than 2 composite probes of a convex array probe, a linear array probe, a phased array probe or a cavity probe.
Furthermore, the number of the array elements is more than 4.
the present invention also provides an ultrasonic imaging apparatus comprising: the array element control unit is used for transmitting ultrasonic waves by controlling more than 2 array elements on the probe to form unfocused cylindrical waves; the cylindrical wave receiving unit is used for respectively realizing each cylindrical wave by more than 1 aperture and receiving an echo by using an array element in the current aperture after transmitting the cylindrical wave; and the aperture synthesis unit is used for synthesizing the echo through an aperture to realize transmitting and receiving double point-by-point focusing images.
Furthermore, the probe is one or more than 2 composite probes of a convex array probe, a linear array probe, a phased array probe or a cavity probe.
From the above, the ultrasonic imaging method provided by the invention reconstructs the whole wave field by using a plurality of independent cylindrical wave sources. And emitting a cylindrical wave field which is not focused in a specific mode by accurately controlling a plurality of array elements. And meanwhile, the receiving time sequence of the receiving array elements is controlled, so that a plurality of receiving beams are formed. After all received beams received by multiple times of cylindrical wave transmission are integrated, the transmission and reception of a double point-by-point focused image is realized through complex aperture synthesis calculation, so that the quality of an ultrasonic image is improved, and particularly the uniformity of the ultrasonic image is obviously improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an ultrasonic imaging apparatus provided in an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The ultrasonic imaging method comprises the steps of controlling more than 2 array elements on a probe to emit ultrasonic waves to form unfocused cylindrical waves; each cylindrical wave is respectively realized by more than 1 aperture, and the array elements in the current aperture are used for receiving echoes after the cylindrical wave is transmitted; and the echo is synthesized through an aperture to realize the transmission and reception of double point-by-point focusing images.
In this embodiment, the center of the generated unfocused cylindrical wave may be on the surface of the probe, or on the surface of the probe. The array element number used for transmitting the cylindrical wave each time is less than or equal to the system transmitting channel number.
As a preferred form of this embodiment, the number of elements is typically greater than 4, which is denoted as N in the following description.
It is especially preferred that if we choose the number of transmit array elements to be odd, then the centre of the cylindrical wave is located at the centre of the central array element. If we choose the number of transmitting array elements to be even, the center of the cylindrical wave is located at the midpoint between the two array elements in the middle.
As another preferable mode of this embodiment, the control is to turn on or off the array elements respectively so that the ultrasonic waves transmitted between the array elements are delayed and are wavefront to form cylindrical waves.
Assuming that the horizontal coordinate of the center of the cylindrical wave is N0, the array element spacing is p, the longitudinal coordinate is z0, and the delay of the array element N is 0 (i.e., N is a boundary array element), the delay factor of the array element N (N is between N0 and N) is:
Of course, when z0 is 0, the above formula can be greatly simplified to
when N is outside the interval of N0 and N, T (N) is a result of symmetry with the calculation of the above formula, and each cylindrical wave is uniquely determined by the center (N0, z0) of the cylinder.
It should be noted that each cylindrical wave can be realized by a plurality of apertures. For example, we can implement each cylindrical wave separately with M apertures and receive echoes using all array elements in the current aperture immediately after transmitting the cylindrical wave.
As a further preferred embodiment, the aperture synthesis reconstructing data obtained from the transmitted cylindrical wave and the received echoes comprises: each pixel point in the ultrasonic image is obtained by summing data sets formed by scanning the surface of the whole probe by horizontally moving the circle center position of the cylindrical wave; the sum of the transmit delay and the receive delay of data points in the data set is a constant.
Specifically, the position of n0 is changed gradually while keeping z0 constant, and the position of the center of the cylindrical wave is gradually moved to scan the entire probe surface. Assuming n0 can shift L positions, then each image needs to be transmitted L × M times. At each transmission, N M array elements receive echo signals independently. Each group of echo signals is a 1-dimensional array with a length Z. Z is related to the depth of the ultrasound image.
Thus, after all ultrasound pulse transmissions and receptions are complete, L × M × N × M different sets of data can be obtained, consisting of a total of L × M × N × M × Z data points.
The entire ultrasound image is then reconstructed from the above L x M x N x M Z data points. The principle of reconstruction is:
1. Each pixel point in the ultrasonic image is obtained by recording a subset of L M Z data points as S and summing;
The sum of the transmit delay and the receive delay of the data points in S is a constant (approximately a constant in the case of error).
As a still further preferred embodiment, the probe may employ a general-purpose probe for cost saving.
In the above embodiment, further, the array element is a block of material divided on the probe.
And furthermore, the probe is one or more than 2 composite probes of a convex array probe, a linear array probe, a phased array probe or a cavity probe.
example 2
The present invention also provides an ultrasonic imaging apparatus, as shown in fig. 1, including:
An array element control unit 100, configured to transmit ultrasonic waves by controlling more than 2 array elements on the probe to form unfocused cylindrical waves;
the cylindrical wave receiving unit 200 is configured to implement each cylindrical wave by using more than 1 aperture, and receive an echo by using an array element in a current aperture after transmitting a cylindrical wave;
and an aperture synthesis unit 300, configured to synthesize the echoes through an aperture to implement transmitting and receiving dual point-by-point focused images.
As a preferred embodiment of this embodiment, a general-purpose probe can be used as the probe for cost saving.
It should be noted that this embodiment is an apparatus invented by using the method of embodiment 1, and the specific implementation details and further preferred implementation manners thereof are completely the same as those of embodiment 1, and are not described herein again.
Referring to method embodiment 1, further, the array elements are blocks of material divided on the probe.
And furthermore, the probe is one or more than 2 composite probes of a convex array probe, a linear array probe, a phased array probe or a cavity probe.
It should be particularly noted that the present invention departs from the traditional focused sound field and applies huygens' principle. According to the huygens principle of fluctuating fields, each wavefield can be reproduced by a series of lattice source stacks. In a two-dimensional plane, a lattice source radiates sound waves to form cylindrical waves. All information of a complete wave field can be reconstructed using multiple independent cylindrical wave sources.
It can be seen from the above embodiments that the present invention has the advantage of generating unfocused cylindrical wave fields by precisely controlling the emission of a plurality of array elements in a specific manner. And meanwhile, the receiving time sequence of the receiving array elements is controlled, so that a plurality of receiving beams are formed. After all received beams received by multiple times of cylindrical wave transmission are integrated, the transmission and reception of a double point-by-point focused image is realized through proper aperture synthesis calculation, so that the quality of an ultrasonic image is improved, and particularly the uniformity of the ultrasonic image is obviously improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. A method of ultrasound imaging, comprising: transmitting ultrasonic waves by controlling more than 2 array elements on the probe to form unfocused cylindrical waves; each cylindrical wave is respectively realized by more than 1 aperture, and the array elements in the current aperture are used for receiving echoes after the cylindrical wave is transmitted; the echo is synthesized through an aperture to realize the transmission and reception of double point-by-point focusing images;
The delay coefficient of the array element n for transmitting the ultrasonic wave is as follows:
n0 is a horizontal coordinate of the center of a cylindrical wave, p is the array element distance, z0 is a longitudinal coordinate, the delay of an array element N is 0, and N is between N0 and N;
Wherein the aperture synthesis reconstructs data obtained for the transmitted cylindrical wave and the received echo, comprising:
Keeping z0 unchanged, gradually changing the position of n0, and gradually moving the position of the center of the cylindrical wave to scan the whole probe surface; n0 transforms L positions, each image transmits L M times, each time, N M array elements receive echo signals independently, each group of echo signals is a 1-dimensional array with the length of Z, after all ultrasonic pulse transmission and reception are finished, L M different data are obtained, the total is composed of L M Z data points, the whole ultrasonic image is reconstructed by the L M Z data points, each pixel point in the ultrasonic image is obtained by summing a subset S of the L M Z data points, the sum of the transmitting delay and the receiving delay of the data point in S is a constant, and each cylindrical wave is realized by M apertures.
2. a method according to claim 1, wherein said controlling is such that the elements are individually switched on and off so that there is a delay in the transmission of ultrasound between the elements and so that the wavefront is such that a cylindrical wave is formed.
3. The method of claim 1, wherein when the number of array elements is odd, the center of the cylindrical wave is located at the center of the central array element; when the number of the array elements is even, the center of the cylindrical wave is located at the midpoint between the two array elements in the middle.
4. the method of claim 1, wherein the probe is a universal probe.
5. the method of claim 1, wherein the array elements are segmented blocks of material on the probe.
6. The method of claim 1, wherein the probe is one or more than 2 composite probes of a convex array, a linear array, a phased array or a cavity probe.
7. The method according to any of claims 1 to 6, wherein the number of array elements is 4 or more.
8. An ultrasound imaging apparatus, comprising:
The array element control unit is used for transmitting ultrasonic waves by controlling more than 2 array elements on the probe to form unfocused cylindrical waves; the delay coefficient of the array element n for transmitting the ultrasonic wave is as follows:N0 is a horizontal coordinate of the center of a cylindrical wave, p is the array element distance, z0 is a longitudinal coordinate, the delay of an array element N is 0, and N is between N0 and N;
The cylindrical wave receiving unit is used for respectively realizing each cylindrical wave by more than 1 aperture and receiving an echo by using an array element in the current aperture after transmitting the cylindrical wave;
The aperture synthesis unit is used for synthesizing the echo through an aperture to realize transmitting and receiving double point-by-point focusing images;
The aperture synthesis unit is specifically used for keeping z0 unchanged, gradually changing the position of n0 and gradually moving the position of the center of a cylindrical wave to scan the whole probe surface; n0 transforms L positions, each image transmits L M times, each time, N M array elements receive echo signals independently, each group of echo signals is a 1-dimensional array with the length of Z, after all ultrasonic pulse transmission and reception are finished, L M different data are obtained, the total is composed of L M Z data points, the whole ultrasonic image is reconstructed by the L M Z data points, each pixel point in the ultrasonic image is obtained by summing a subset S of the L M Z data points, the sum of the transmitting delay and the receiving delay of the data point in S is a constant, and each cylindrical wave is realized by M apertures.
9. the device of claim 8, wherein the probe is one or more than 2 composite probes of a convex array probe, a linear array probe, a phased array probe or a cavity probe.
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| CN201610487901.7A CN106037805B (en) | 2016-06-28 | 2016-06-28 | Method and device for ultrasonic imaging |
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| CN201610487901.7A CN106037805B (en) | 2016-06-28 | 2016-06-28 | Method and device for ultrasonic imaging |
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| WO2018195873A1 (en) * | 2017-04-27 | 2018-11-01 | 深圳迈瑞生物医疗电子股份有限公司 | Doppler imaging method and apparatus for ultrasonic continuous waves, and storage medium |
| CN107374670A (en) * | 2017-07-20 | 2017-11-24 | 朗昇科技（苏州）有限公司 | A kind of synthetic aperture supersonic imaging device and method |
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| CN101156788A (en) * | 2007-11-14 | 2008-04-09 | 成都西云科技有限公司 | B ultra Imaging method |
| CN105011965A (en) * | 2015-06-10 | 2015-11-04 | 熊佑全 | Focusing implementation method by adoption of aperture synthesis and ultrasonic holography for scanning |
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| CN104570340B (en) * | 2013-10-24 | 2017-04-05 | 清华大学 | The method for designing of free form surface imaging system |
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| CN1788685A (en) * | 2004-12-15 | 2006-06-21 | 深圳迈瑞生物医疗电子股份有限公司 | Receiving method and its device based on double beam and synthetic aperture |
| CN101156788A (en) * | 2007-11-14 | 2008-04-09 | 成都西云科技有限公司 | B ultra Imaging method |
| CN105011965A (en) * | 2015-06-10 | 2015-11-04 | 熊佑全 | Focusing implementation method by adoption of aperture synthesis and ultrasonic holography for scanning |
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