CN116650009B - A high-transmittance ultrasonic tomography detector - Google Patents
A high-transmittance ultrasonic tomography detectorInfo
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- CN116650009B CN116650009B CN202310433985.6A CN202310433985A CN116650009B CN 116650009 B CN116650009 B CN 116650009B CN 202310433985 A CN202310433985 A CN 202310433985A CN 116650009 B CN116650009 B CN 116650009B
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Abstract
The invention discloses a high-transmissivity ultrasonic tomography detector, which belongs to the field of ultrasonic imaging devices and comprises at least one ultrasonic transmitting-receiving unit consisting of ultrasonic transmitting transducers and ultrasonic receiving transducers which are distributed in opposite directions, wherein piezoelectric elements of the ultrasonic transmitting transducers are provided with multi-array element piezoelectric layers with array elements distributed in a plane matrix, and piezoelectric elements of the ultrasonic receiving transducers are provided with multi-array element piezoelectric layers with array elements distributed in a convex matrix, wherein the array elements are prepared by single-crystal PIN-PMN-PT. The invention adopts high-performance piezoelectric materials to prepare the transmitting and receiving transducers, the array elements of the piezoelectric layer of the transmitting transducer adopt a planar matrix design to generate a uniform sound field, the directivity of the transmitting ultrasonic waves is improved, and the piezoelectric layer of the receiving transducer adopts a convex design to improve the receiving sensitivity. The invention has high resolution and large penetration depth, and is suitable for the ultrasonic diagnosis and treatment fields such as tumor detection of deep tissue of human body, ultrasonic navigation in abdominal operation and the like.
Description
Technical Field
The invention relates to the field of medical ultrasonic imaging devices, in particular to an ultrasonic tomography detector.
Background
The traditional ultrasonic imaging has the advantages of real time, no wound, no radiation, low cost and the like compared with the Computer Tomography (CT) and the Magnetic Resonance Imaging (MRI) by receiving and processing the reflected signals so as to obtain the internal image of the detected object, but the traditional ultrasonic imaging is difficult to obtain the three-dimensional anatomical image of the detected object with high resolution, and high expertise and expertise are required for clinically judging the ultrasonic image. The ultrasonic tomography inverts the internal structure image of the object by detecting scattered waves around the detected object, can break the problems faced by the traditional ultrasonic imaging, and has wide application prospect in the fields of navigation, disease detection, nondestructive detection and the like in operation.
The performance of an ultrasound probe, which is a core component of an ultrasound tomography system, determines the detection capabilities of the covered region and the quality of the tomographic image. There have been many developments in research of ultrasonic tomography probes at home and abroad, such as Martiartu nk.et al in 2020, using a pair of movable linear ultrasonic transducer arrays of 3.2MHz and 16 array elements piezoelectric composite material to realize breast imitation imaging, and by rotating the whole system 23 times and placing receiving transducers at 11 different positions each time to fully obtain ultrasonic transmission data, imaging resolution is improved (Martiartu nk.et al, IEEE trans. Ultrason. Ferroelectronics. Freq. Control 2020,67,7). Duric n and Littrup p report a rotatable, piezoelectric composite based 1.5MHz, 256 element ring transducer and were used for in vivo whole breast imaging and breast mass detection (Duric n., littrup p., med. Phys.2007,34,2). Wiskin J.et al, employing QTThe ultrasound probe of the device is composed of 1 plane wave transmitting transducer, 1 2048 array element ultrasound receiving transducer based on piezoelectric composite material (used for collecting transmission ultrasound signals) and 3 transducers used for receiving reflection signals (Wiskin J.et al., sci.Rep.2020,10 (1), 1-14). The university of Tianjin Tan Chao teaches that 16 1-3 lead zirconate titanate (PZT) composite single element ultrasonic transducers are used to construct a ring-shaped ultrasonic tomography probe and that different media are placed in the center region of the probe ring for validation testing (Zhang w.et al., IEEE trans. Instrum. Meas.2020,69,9). The university of north and middle professor Zhang Wendong, based on a pair of 3mhz,128 array element Capacitive Micromachined Ultrasonic Transducers (CMUTs) that rely on motorized turntable rotation, realized ultrasonic tomography of simulated tumors in breast prostheses (Pei y.et al, IEEE sens.j.2022,22, 2).
The traditional ultrasonic tomography detector is summarized to have lower imaging resolution of a combined detector based on a single-array element ultrasonic transducer, and although the imaging resolution can be improved to a certain extent by increasing the number of transducers and the number of array elements thereof, the ultrasonic tomography detector is limited by the piezoelectric performance of a piezoelectric composite material adopted at the present stage, the emitted ultrasonic is difficult to penetrate deep tissues of a human body, and the ultrasonic tomography is still only suitable for imaging superficial tissues of the human body such as breasts. The CMUT transducer is limited by the capacitive plate gap space and limited in amplitude, resulting in lower transmit sensitivity, which also suffers from the above-mentioned problems.
There are few current ultrasound tomography detectors that compromise high imaging resolution and large penetration depth. How to improve the transmitting sensitivity and the receiving sensitivity of the transducer so as to realize large-span high-resolution ultrasonic tomography, and how to design a reasonable dense array element matrix ultrasonic energy to improve the imaging resolution are the problems to be solved by the technicians in the field at present.
As monocrystalline materials PIN-PMN-PT and PMN-PT with high piezoelectric performance, the matrix ultrasonic transducer with high sensitivity can be prepared, and the bottleneck that the existing ultrasonic tomography detector is difficult to realize large-depth transmission under the condition of high working frequency is hopeful to be solved.
Disclosure of Invention
The invention aims to provide a structural design of a high-transmittance ultrasonic tomography detector and a high-performance piezoelectric monocrystal material design, which are used for high-sensitivity emission and high-sensitivity receiving of ultrasonic waves so as to realize a large-span high-resolution ultrasonic tomography function.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The invention provides a high-transmissivity ultrasonic tomography detector which comprises at least one ultrasonic transmitting-ultrasonic receiving unit, wherein the ultrasonic transmitting-ultrasonic receiving unit comprises ultrasonic transmitting transducers and ultrasonic receiving transducers which are oppositely distributed, piezoelectric elements of the ultrasonic transmitting transducers are provided with multi-array element piezoelectric layers with array elements distributed in a plane matrix, piezoelectric materials adopt monocrystal PMN-PT, piezoelectric elements of the ultrasonic receiving transducers are provided with multi-array element piezoelectric layers with array elements distributed in a convex matrix, and piezoelectric materials adopt monocrystal PIN-PMN-PT.
The ultrasonic transmitting transducer in the ultrasonic transmitting-receiving unit is used for transmitting ultrasonic waves, the piezoelectric layer is in a plane, the ultrasonic receiving transducer is used for receiving transmitted ultrasonic signals penetrating through the detected object, and the piezoelectric layer is in a circular arc convex surface. The plane of the piezoelectric layer of the ultrasonic transmitting transducer is opposite to the convex surface of the piezoelectric layer of the ultrasonic receiving transducer.
The working frequency of the single crystal PMN-PT is in the range of 2-6MHz, and the bandwidth is more than 65%. Preferably, the piezoelectric material used for the piezoelectric layer of the ultrasonic emission transducer is monocrystal PMN-32%PT, the chemical molecular formula is Pb (Mg 1/3Nb2/3)O3-32％PbTiO3, with high piezoelectric coefficient, d 33 =1620 pC/N, which is beneficial to improving the emission sensitivity of the ultrasonic emission transducer.
The working frequency of the monocrystal PIN-PMN-PT is in the range of 2-6MHz, and the bandwidth is more than 65%. Preferably, the piezoelectric material used in the piezoelectric layer of the ultrasonic receiving transducer is monocrystalline PIN33% -PMN-PT, the chemical molecular formula is ：33％Pb(In1/ 2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3,, the piezoelectric material has a relatively high piezoelectric constant and a relatively low dielectric constant, the piezoelectric constant d 33 is 1338pC/N, and the relative dielectric constant epsilon 3T3 is 4532, so that the receiving sensitivity of the ultrasonic receiving transducer is improved.
Preferably, the number of the array elements of the piezoelectric layer of the ultrasonic transmitting transducer and the number of the array elements of the piezoelectric layer of the ultrasonic receiving transducer are not less than 256. The invention adopts the design of the transducer with no less than 256 array elements and the bandwidth of the transducer is more than 65 percent, thereby improving the resolution of ultrasonic tomography.
Preferably, the number of array elements of the piezoelectric layer is set to 128×2, 64×4 or 32×32.
Preferably, the matrix type of the piezoelectric layers of the ultrasonic transmitting transducer and the ultrasonic receiving transducer is 1.5D or 2D.
Preferably, the matrix types of the piezoelectric layers of the ultrasonic transmitting transducer and the ultrasonic receiving transducer are 1.5D, the number of array elements is 128 multiplied by 2, the width of the array elements is 0.45mm, the center distance of the array elements is 0.55mm, the length of the 2 nd array element is 5mm, the lengths of the 1 st and the 3 rd array elements are 2.5mm, the widths of the longitudinal isolation grooves and the transverse isolation grooves of the array elements are 0.10mm and 0.25mm respectively, and the curvature radius of the convex surface of the piezoelectric layer of the ultrasonic receiving transducer is 55-65cm.
Preferably, the matrix types of the piezoelectric layers of the ultrasonic transmitting transducer and the ultrasonic receiving transducer are 1.5D, the number of array elements is 64 multiplied by 4, the width of the array elements is 0.50mm, the center distance of the array elements is 0.60mm, the length of the 4 th array element is 5mm, the lengths of the 1 st, 2 nd, 3 rd, 5 th, 6 th and 7 th array elements are 2.5mm, the widths of the longitudinal isolation grooves and the transverse isolation grooves of the array elements are 0.10mm and 0.30mm respectively, and the curvature radius of the convex surface of the piezoelectric layer of the ultrasonic receiving transducer is 50-60cm.
Preferably, the matrix types of the piezoelectric layers of the ultrasonic transmitting transducer and the ultrasonic receiving transducer are 2D, the number of array elements is 32 multiplied by 32, the width of the array elements is 0.40mm, the center distance of the array elements is 0.50mm, the length of the array elements is 5mm, the widths of the longitudinal isolation grooves and the transverse isolation grooves of the array elements are 0.10mm and 0.20mm respectively, and the curvature radius of the convex surface of the piezoelectric layer of the ultrasonic receiving transducer is 45-55cm.
In order to improve the ultrasonic tomography rate, the detector is provided with two or more ultrasonic transmitting-ultrasonic receiving units, so that the detection coverage range is enlarged, and the detection can be performed in a mode of rotationally moving the ultrasonic transmitting-ultrasonic receiving units by using a rotating device. Further, the rotating device is a precision mechanical moving component, and the stepping motor drives and controls the movement of the transmitting transducer and the receiving transducer, so that the transmitting transducer and the receiving transducer are kept in opposite states. The precise mechanical moving component is adopted, so that the number and cost of the transducers are reduced, and meanwhile, the detection coverage area can be enlarged.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention adopts the high-performance monocrystalline piezoelectric material PMN-PT to prepare the transmitting transducer, has high piezoelectric constant, adopts the monocrystalline piezoelectric material PIN-PMN-PT to prepare the receiving transducer, has relatively low dielectric constant, adopts the piezoelectric material to realize high electroacoustic conversion efficiency, has strong ultrasonic transmitting signal and high penetration depth of human tissues, has high receiving sensitivity, and is beneficial to improving the definition of ultrasonic tomography.
(2) The matrix ultrasonic transducer for transmitting adopts a planar matrix design, can generate a relatively uniform sound field, improves the directivity of the transmitted ultrasonic wave, adopts a convex design, has larger surface area, has better focusing effect when receiving the ultrasonic wave, and can improve the receiving sensitivity.
(3) The invention adopts the design of a multi-array element matrix structure, the bandwidth of the transducer is more than 65 percent, and the ultrasonic tomography resolution can be improved.
(4) The invention has high resolution and large penetration depth, and is suitable for the digital diagnosis and treatment fields of tumor ultrasonic imaging detection of deep tissue parts of human body, ultrasonic navigation in abdominal operation and the like.
Drawings
FIG. 1 is a schematic diagram of the overall design of an ultrasonic tomography detector, in which, a 1, 3-plane matrix ultrasonic transmitting transducer, a2, 4-convex matrix ultrasonic receiving transducer and a 5-precision mechanical moving member are shown.
Fig. 2 is a schematic diagram of a piezoelectric layer design of a 128×2 array element planar matrix ultrasonic transmitting transducer.
Fig. 3 is a schematic diagram of a design of a piezoelectric layer of a 128×2 array element convex matrix ultrasonic receiving transducer.
Fig. 4 is a schematic diagram of a circuit connection mode of each array element of the 128×2 array element ultrasonic transducer.
Fig. 5 is a schematic diagram of the operation of an ultrasound tomography probe.
Fig. 6 is an imaging view of a 128 x 2 array element ultrasound transmit-receive detector.
Fig. 7 is a 3D reconstructed image of a 128 x 2 array element ultrasound transmit-receive detector ultrasound tomographic scan.
Fig. 8 is a schematic diagram of a piezoelectric layer design of a 64×4 array element planar matrix ultrasonic transmitting transducer.
Fig. 9 is a schematic diagram of a design of a piezoelectric layer of a 64×4 array element convex matrix ultrasonic receiving transducer.
Fig. 10 is a schematic diagram of a circuit connection mode of each array element of the 64×4 array element ultrasonic transducer.
Fig. 11 is an imaging view of a 64 x 4 array element ultrasound transmit-receive detector.
Fig. 12 is a schematic diagram of a piezoelectric layer design of a 32×32 array element planar matrix ultrasonic transmitting transducer.
Fig. 13 is a schematic diagram of a design of a piezoelectric layer of a 32×32 array element convex matrix ultrasonic receiving transducer.
Fig. 14 is a schematic diagram of a circuit connection mode of each array element of the 32×32 array element ultrasonic transducer.
Fig. 15 is an imaging view of a 32 x 32 array element ultrasound transmit-receive detector.
Fig. 16 is an imaging view of a 128 x 2 array element planar ultrasound transmit-planar ultrasound receive detector.
Detailed Description
The invention will be further illustrated with reference to specific examples. The following examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention, and the technical features of the various embodiments of the present invention can be combined correspondingly without conflicting with each other. Modifications and substitutions to methods, procedures, or conditions of the present invention without departing from the spirit and nature of the invention are intended to be within the scope of the present invention.
The piezoelectric materials PMN-32% PT, PIN33% -PMN-PT, PMN-28% PT, PIN24% -PMN-PT used in the following specific examples are commercially available from CTS corporation of America.
Example 1
The present embodiment provides a high-transmittance ultrasonic tomography probe whose composition includes two ultrasonic transmit-receive units, as shown in fig. 1. The ultrasonic transmitting-receiving unit consists of ultrasonic transmitting transducers 1 (3) and ultrasonic receiving transducers 2 (4) which are arranged in opposite distribution, and the ultrasonic transmitting-receiving unit is loaded on a precision mechanical moving member 5. The piezoelectric element of the ultrasonic receiving transducer is provided with the multi-array element piezoelectric layer with array elements distributed in a convex matrix, and the piezoelectric material is monocrystalline PIN-PMN-PT.
Specifically, the piezoelectric material of the ultrasonic transmitting transducer adopts PMN-32% PT, and the piezoelectric constant d 33 is 1620pC/N.
Specifically, the piezoelectric material of the ultrasonic receiving transducer adopts PIN33% -PMN-PT, has a relatively high piezoelectric constant, d 33 is 1338pC/N, and has a relatively low dielectric constant, and epsilon 3T3 is 4532.
Specifically, as shown in fig. 2, the piezoelectric layer matrix of the ultrasonic transmitting transducer is 1.5D, and the number of array elements is 128×2. The array element width w T is 0.45mm, the array element center distance P T is 0.55mm, the array element length E TC of the 2 nd array is 5mm, the array element lengths E TS of the 1 st and 3 rd arrays are 2.5mm, and the array element longitudinal separation grooves g T1 and the transverse separation grooves g T2 are respectively 0.10mm and 0.25mm.
Specifically, as shown in fig. 3, the piezoelectric layer matrix of the ultrasonic receiving transducer is 1.5D, and the number of array elements is 128×2. The array element width w C is 0.45mm, the array element center distance P C is 0.55mm, the array element length E CC of the 2 nd array is 5mm, the array element lengths E CS of the 1 st and 3 rd arrays are 2.5mm, the array element longitudinal separation grooves g C1 and the transverse separation grooves g C2 are respectively 0.10mm and 0.25mm, and the curvature radius R of the piezoelectric layer is 55cm. The convex surface serves as a signal receiving surface.
Specifically, the connection mode of each array element circuit of the planar matrix ultrasonic transmitting transducer and the convex matrix ultrasonic receiving transducer is shown in fig. 4, and the 1 st array element and the 3 rd array element are connected in series to form an array element, so that 256 independent array elements are formed in a conformal manner.
The working principle of the high-transmissivity ultrasonic tomography detector is as follows:
The ultrasonic transducer is mounted on a precision mechanical moving component, the movement of the transducer is controlled by driving of a stepping motor so as to obtain projection amounts of objects to be measured under different angles, and an ultrasonic signal is acquired by using a Transmission mode (Transmission), as shown in fig. 5. And then, carrying out relative attenuation calculation on the acquired ultrasonic signals to obtain attenuation projection quantity distribution conditions, obtaining sound velocity projection quantity distribution conditions of different angles by utilizing the time difference of the ultrasonic waves reaching the receiving transducer, and reconstructing a high-resolution ultrasonic computer tomography image by a filtering back projection method.
Test results:
placing the planar matrix ultrasonic transmitting transducer in a water tank by adopting The 3.5MHz water immersion probe is used for receiving, the distance between the transducer and the probe is 12 cm, the working frequency of the transmitting transducer is 3.17MHz, the bandwidth is 76.88%, and the sensitivity is-65.92 dB.
Placing the convex matrix ultrasonic receiving transducer in a water tank, adoptingThe 3.5MHz water immersed probe is used for transmitting, the distance between the transducer and the probe is 12 cm, the working frequency of the receiving transducer is 3.16MHz, the bandwidth is 102.11%, and the sensitivity is-69.72 dB.
Placing the planar matrix ultrasonic transmitting transducer and the convex matrix ultrasonic receiving transducer549 Ultrasonic phantom imaging at both ends can achieve penetration depths up to 11.8 cm, as shown in fig. 6.
The plane matrix ultrasonic transmitting transducer and the convex matrix ultrasonic receiving transducer are arranged at two ends of a capillary sample (arranged in a water tank) for imaging, and the obtained imaging result is shown in fig. 7, so that the shape and the outline of the capillary can be clearly displayed by visible ultrasonic tomography.
Example 2
The embodiment provides a high-transmissivity ultrasonic tomography detector which comprises an ultrasonic transmitting-receiving unit, wherein the ultrasonic transmitting-receiving unit comprises ultrasonic transmitting transducers and ultrasonic receiving transducers which are oppositely distributed, piezoelectric elements of the ultrasonic transmitting transducers are multi-array element piezoelectric layers with array elements distributed in a plane matrix, piezoelectric elements of the ultrasonic receiving transducers are single-crystal PMN-PT, piezoelectric elements of the ultrasonic receiving transducers are multi-array element piezoelectric layers with array elements distributed in a convex matrix, and piezoelectric elements of the ultrasonic receiving transducers are single-crystal PIN-PMN-PT.
Specifically, the piezoelectric material of the ultrasonic transmitting transducer adopts PMN-32% PT.
Specifically, the piezoelectric material of the ultrasonic receiving transducer adopts PIN33% -PMN-PT.
Specifically, as shown in fig. 8, the piezoelectric layer matrix of the ultrasonic transmitting transducer is 1.5D, and the number of array elements is 64×4. The array element width w T is 0.50mm, the array element center distance P T is 0.60mm, the 4 th array element length E TC is 5mm, the 1 st, 2 nd, 3 rd, 5th, 6 th and 7 th array element lengths E TS are 2.5mm, and the array element longitudinal separation grooves g T1 and the transverse separation grooves g T2 are 0.10mm and 0.30mm respectively.
Specifically, as shown in fig. 9, the piezoelectric layer matrix of the ultrasonic receiving transducer is 1.5D, and the number of array elements is 64×4. The array element width w C is 0.50mm, the array element center distance P C is 0.60mm, the 4 th array element length E CC is 5mm, the 1 st, 2 nd, 3 rd, 5 th, 6 th and 7 th array element lengths E CS are 2.5mm, the array element longitudinal separation grooves g C1 and the transverse separation grooves g C2 are respectively 0.10mm and 0.30mm, and the curvature radius R of the piezoelectric layer is 50cm. The convex surface serves as a signal receiving surface.
Specifically, the circuit connection manner of each array element of the planar matrix ultrasonic transmitting transducer and the convex matrix ultrasonic receiving transducer is shown in fig. 10, and the array elements at the bilateral symmetry positions are connected in series to form one array element, so that 256 independent array elements are formed.
Test results:
placing the planar matrix ultrasonic transmitting transducer in a water tank by adopting The 3.5MHz water immersion probe is used for receiving, the distance between the transducer and the probe is 12 cm, the working frequency of the transmitting transducer is 3.21MHz, the bandwidth is 76.05%, and the sensitivity is-66.45 dB.
Placing the convex matrix ultrasonic receiving transducer in a water tank, adoptingThe 3.5MHz water immersed probe is used for transmitting, the distance between the transducer and the probe is 12 cm, the working frequency of the receiving transducer is 3.15MHz, the bandwidth is 100.83%, and the sensitivity is-70.59 dB.
Placing the planar matrix ultrasonic transmitting transducer and the convex matrix ultrasonic receiving transducer549 Ultrasound phantom imaging at both ends can achieve penetration depths up to 12.9 cm, as shown in fig. 11.
Example 3
The embodiment provides a high-transmissivity ultrasonic tomography detector which comprises an ultrasonic transmitting-receiving unit, wherein the ultrasonic transmitting-receiving unit comprises ultrasonic transmitting transducers and ultrasonic receiving transducers which are oppositely distributed, piezoelectric elements of the ultrasonic transmitting transducers are multi-array element piezoelectric layers with array elements distributed in a plane matrix, piezoelectric elements of the ultrasonic receiving transducers are single-crystal PMN-PT, piezoelectric elements of the ultrasonic receiving transducers are multi-array element piezoelectric layers with array elements distributed in a convex matrix, and piezoelectric elements of the ultrasonic receiving transducers are single-crystal PIN-PMN-PT.
Specifically, the piezoelectric material of the ultrasonic transmitting transducer adopts PMN-32% PT.
Specifically, the piezoelectric material of the ultrasonic receiving transducer adopts PIN33% -PMN-PT.
Specifically, as shown in fig. 12, the piezoelectric layer matrix of the ultrasonic transmitting transducer is 2D, and the number of array elements is 32×32. The array element width w T is 0.40mm, the array element center distance P T is 0.50mm, the array element length E T is 5mm, and the array element longitudinal separation grooves g T1 and the transverse separation grooves g T2 are respectively 0.10mm and 0.20mm.
Specifically, as shown in fig. 13, the piezoelectric layer matrix of the ultrasonic receiving transducer is 2D, and the number of array elements is 32×32. The array element width w C is 0.40mm, the array element center distance P C is 0.50mm, the array element length E C is 5mm, the array element longitudinal separation grooves g C1 and the transverse separation grooves g C2 are respectively 0.10mm and 0.20mm, and the curvature radius R of the piezoelectric layer is 45cm. The convex surface serves as a signal receiving surface.
Specifically, the circuit connection mode of each array element of the planar matrix ultrasonic transmitting transducer and the convex matrix ultrasonic receiving transducer is shown in fig. 14, each unit is independent, and 1024 independent array elements are formed in a conformal manner.
Test results:
placing the planar matrix ultrasonic transmitting transducer in a water tank by adopting The 3.5MHz water immersion probe is used for receiving, the distance between the transducer and the probe is 12 cm, the working frequency of the transmitting transducer is 3.14MHz, the bandwidth is 78.66%, and the sensitivity is-66.19 dB.
Placing the convex matrix ultrasonic receiving transducer in a water tank, adoptingThe 3.5MHz water immersed probe is used for transmitting, the distance between the transducer and the probe is 12 cm, the working frequency of the receiving transducer is 2.98MHz, the bandwidth is 94.86%, and the sensitivity is-71.35 dB.
Placing the planar matrix ultrasonic transmitting transducer and the convex matrix ultrasonic receiving transducer549 Ultrasound body membranes were imaged at both ends, with penetration depths up to 14 cm achieved, as shown in fig. 15.
Comparative example 1
This comparative example provides an imaging contrast that employs a planar ultrasound transducer as the ultrasound transmitting and receiving device at the same time.
Specifically, the matrix type of the piezoelectric layer of the transducer is 1.5D, and the number of array elements is 128 multiplied by 2. The array element width w T is 0.45mm, the array element center distance P T is 0.55mm, the array element length E TC of the 2 nd array is 5mm, the array element lengths E TS of the 1 st and 3 rd arrays are 2.5mm, and the array element longitudinal separation grooves g T1 and the transverse separation grooves g T2 are respectively 0.10mm and 0.25mm. The piezoelectric material of the ultrasonic transmitting transducer adopts PMN-32%PT. The piezoelectric material of the ultrasonic receiving transducer adopts PIN33% -PMN-PT.
Placing a planar matrix ultrasonic transmitting transducer and a planar matrix ultrasonic receiving transducer549 Ultrasound body membrane was imaged at both ends, the imaging results were as shown in fig. 16, with lower imaging resolution than in example 1.
Comparative example 2
This comparative example provides a comparison of the transmit sensitivity of ultrasound transmit transducers using the same design parameters and different piezoelectric materials.
Specifically, the piezoelectric layer matrix type of the ultrasonic transmitting transducer is 1.5D, and the number of array elements is 64×4. The array element width w T is 0.50mm, the array element center distance P T is 0.60mm, the 4 th array element length E TC is 5mm, the 1 st, 2 nd, 3 rd, 5 th, 6 th and 7 th array element lengths E TS are 2.5mm, and the array element longitudinal separation grooves g T1 and the transverse separation grooves g T2 are 0.10mm and 0.30mm respectively.
The transducer emission sensitivity test comprises placing the planar matrix ultrasonic emission transducer in a water tank, and adoptingThe 3.5MHz water immersion probe is used for receiving, the distance between the transducer and the probe is 12 cm, and the transmitting sensitivity of the transmitting transducer is measured.
Specifically, the emission sensitivity of the PMN-32% PT piezoelectric material is-66.45 dB.
Specifically, the emission sensitivity of the piezoelectric material PMN-28% PT is-57.44 dB.
Comparative example 3
This comparative example provides a comparison of the receive sensitivity of ultrasound receiving transducers using the same design parameters and different piezoelectric materials.
Specifically, the piezoelectric layer matrix of the ultrasonic receiving transducer is 2D, and the number of array elements is 32×32. The array element width w C is 0.40mm, the array element center distance P C is 0.50mm, the array element length E C is 5mm, the array element longitudinal separation grooves g C1 and the transverse separation grooves g C2 are respectively 0.10mm and 0.20mm, and the curvature radius R of the piezoelectric layer is 45cm. The convex surface serves as a signal receiving surface.
The receiving sensitivity test of the transducer comprises placing the convex matrix ultrasonic receiving transducer in a water tank, and adoptingThe 3.5MHz water immersion probe is used for transmitting, the distance between the transducer and the probe is 12 cm, and the receiving sensitivity of the receiving transducer is tested.
Specifically, the receiving sensitivity of the transducer adopting piezoelectric materials PIN33% -PMN-PT is-71.35 dB.
Specifically, the receiving sensitivity of the transducer adopting the piezoelectric material PIN24% -PMN-PT is-65.83 dB.
In summary, the invention provides a high-transmittance ultrasonic tomography detector, which comprises at least one ultrasonic transmitting-ultrasonic receiving unit, wherein the ultrasonic transmitting-ultrasonic receiving unit comprises ultrasonic transmitting transducers and ultrasonic receiving transducers which are oppositely distributed, piezoelectric elements of the ultrasonic transmitting transducers are provided with multi-array element piezoelectric layers with array elements distributed in a plane matrix, piezoelectric elements of the ultrasonic receiving transducers are provided with multi-array element piezoelectric layers with array elements distributed in a convex matrix, the piezoelectric elements of the ultrasonic receiving transducers are provided with single-array element piezoelectric layers with array elements distributed in a convex matrix, the piezoelectric materials are single-array PIN-PMN-PT, the working frequency is 2-6 MHz, and the bandwidth is more than 65%. The high-transmissivity ultrasonic tomography detector provided by the invention has the advantages of simple structure and high transmitting and receiving sensitivity, and is suitable for the medical fields of human deep tissue tumor detection, intraoperative ultrasonic navigation and the like.
The above described embodiments are only preferred embodiments of the present invention, but are not intended to limit the present invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, all the technical schemes obtained by adopting the equivalent substitution or equivalent transformation are within the protection scope of the invention.
Claims (2)
1. The high-transmissivity ultrasonic tomography detector is characterized by comprising at least one ultrasonic transmitting-receiving unit, wherein the ultrasonic transmitting-receiving unit consists of ultrasonic transmitting transducers and ultrasonic receiving transducers which are oppositely distributed, piezoelectric elements of the ultrasonic transmitting transducers are multi-array element piezoelectric layers with array elements distributed in a plane matrix, piezoelectric materials adopt monocrystal PMN-32% PT, piezoelectric elements of the ultrasonic receiving transducers are multi-array element piezoelectric layers with array elements distributed in a convex matrix, the piezoelectric materials adopt monocrystal PIN33% -PMN-PT, the working frequencies of the monocrystal PMN-32% PT and the monocrystal PIN33% -PMN-PT are in a range of 2-6MHz, and the bandwidth is larger than 65%;
The array type of the piezoelectric layers of the ultrasonic transmitting transducer and the ultrasonic receiving transducer is 1.5D, the number of array elements is 128 multiplied by 2, the width of the array elements is 0.45mm, the center distance of the array elements is 0.55mm, the length of the 2 nd array element is 5mm, the lengths of the 1 st and the 3 rd array elements are 2.5mm, the widths of the longitudinal isolation groove and the transverse isolation groove of the array elements are 0.10mm and 0.25mm respectively, and the convex curvature radius of the piezoelectric layer of the ultrasonic receiving transducer is 55-65cm;
Or the matrix type of the piezoelectric layers of the ultrasonic transmitting transducer and the ultrasonic receiving transducer is 1.5D, the number of the array elements is 64 multiplied by 4, the width of the array elements is 0.50mm, the center distance of the array elements is 0.60mm, the length of the 4 th array element is 5mm, the lengths of the 1 st, 2 nd, 3 rd, 5 th, 6 th and 7 th array elements are 2.5mm, the widths of the longitudinal isolation grooves and the transverse isolation grooves of the array elements are 0.10mm and 0.30mm respectively, and the curvature radius of the convex surface of the piezoelectric layer of the ultrasonic receiving transducer is 50-60cm;
Or the matrix types of the piezoelectric layers of the ultrasonic transmitting transducer and the ultrasonic receiving transducer are 2D, the number of array elements is 32 multiplied by 32, the width of the array elements is 0.40mm, the center distance of the array elements is 0.50mm, the length of the array elements is 5mm, the widths of the longitudinal isolation grooves and the transverse isolation grooves of the array elements are 0.10mm and 0.20mm respectively, and the curvature radius of the convex surface of the piezoelectric layer of the ultrasonic receiving transducer is 45-55cm.
2. The high-transmissivity ultrasound tomography detector of claim 1, wherein the detector is provided with two or more ultrasound transmit-ultrasound receive units.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107174284A (en) * | 2017-07-08 | 2017-09-19 | 中北大学 | Breast ultrasound imaging system and its detection method based on CMUT annular arrays |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107174284A (en) * | 2017-07-08 | 2017-09-19 | 中北大学 | Breast ultrasound imaging system and its detection method based on CMUT annular arrays |
Non-Patent Citations (1)
| Title |
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| 用超声波向植入型电子装置传送控制信号的方式;宋金耀;国外医学生物医学工程分册;19950228;第18卷(第1期);第41-44页 * |
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