CN110742650A - Tissue-imitated phantom for detecting imaging uniformity of ultrasonic tomography equipment - Google Patents

Tissue-imitated phantom for detecting imaging uniformity of ultrasonic tomography equipment Download PDF

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CN110742650A
CN110742650A CN201911241635.XA CN201911241635A CN110742650A CN 110742650 A CN110742650 A CN 110742650A CN 201911241635 A CN201911241635 A CN 201911241635A CN 110742650 A CN110742650 A CN 110742650A
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tissue
phantom
lower panel
target
supporting plate
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牛凤岐
张迪
朱承纲
程洋
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Institute of Acoustics CAS
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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
    • A61B8/58—Testing, adjusting or calibrating the diagnostic device
    • A61B8/587—Calibration phantoms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/08—Detecting organic movements or changes, e.g. tumours, cysts, swellings
    • A61B8/0825—Detecting organic movements or changes, e.g. tumours, cysts, swellings for diagnosis of the breast, e.g. mammography
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/08—Detecting organic movements or changes, e.g. tumours, cysts, swellings
    • A61B8/0833—Detecting organic movements or changes, e.g. tumours, cysts, swellings involving detecting or locating foreign bodies or organic structures
    • A61B8/085—Detecting organic movements or changes, e.g. tumours, cysts, swellings involving detecting or locating foreign bodies or organic structures for locating body or organic structures, e.g. tumours, calculi, blood vessels, nodules

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Abstract

The invention discloses a tissue phantom for detecting the imaging uniformity of an ultrasonic tomography device, which is in a round table shape and comprises: a phantom shell, an acoustic window (3), a support plate (6), a background tissue imitating material (14) and a plurality of target lines (4); the phantom shell is formed by fixedly connecting an upper panel (2), a lower panel (8) and a supporting plate (10), the phantom shell and a sound window (3) which is stuck and connected with the side surface of the circular truncated cone form a closed space, a background tissue imitating material (14) is filled in the closed space, and each target line (4) vertically penetrates through the lower panel (8) from the upper panel (2) and is embedded in the background tissue imitating material (14); an inlet for filling a background tissue-imitating material (14) is formed in the supporting plate (10), and a plugging rubber is attached to the inlet; and a supporting and protecting plate (6) is fixed outside the supporting plate (10). The tissue-imitating body model can be used for detecting and evaluating the imaging uniformity of an ultrasonic tomography scanning device.

Description

Tissue-imitated phantom for detecting imaging uniformity of ultrasonic tomography equipment
Technical Field
The invention belongs to the field of quality detection of medical instruments, and particularly relates to a tissue-imitated body model for detecting imaging uniformity of an ultrasonic tomography device.
Background
B-ultrasonic and X-CT, magnetic resonance imaging, nuclear medicine imaging are the four most practical diagnostic imaging techniques in the present day, and B-ultrasonic is the top of the four in terms of popularity. Particularly under specific conditions in China, the B-mode ultrasound technology is not only used for routine diagnosis of various diseases, but also is generally used in the fields of birth control, eugenics and reproductive health. The performance and quality of the Chinese characters are related to economic benefits of manufacturers and hospitals, and the health and the welfare of the whole Chinese nation including offspring and offspring are affected. In view of this, the national authorities have established and released the corresponding technical standards as legal compliance for their life-long quality supervision.
In clinic, doctors make diagnosis according to the information provided by the ultrasonic scanning sonogram, so the image quality is considered as the primary factor for measuring the quality of the B-ultrasonic product and judging whether the B-ultrasonic works normally or not. According to international consensus, the technical indicators (i.e. performance) characterizing the image quality include dead zone, depth of detection, axial (longitudinal) resolution, lateral (transverse) resolution, pitch resolution, contrast resolution, and geometric errors of display and measurement, etc. The material technical means which can make objective, rapid, vivid and quantitative evaluation on the performance and quality of the B ultrasonic equipment in all links of development, production, sale, use, maintenance and legal management (quality supervision and inspection, metrological verification, import and export commodity inspection) of the B ultrasonic equipment only has an imitated tissue ultrasonic phantom. An ultrasonic Tissue simulation Phantom is translated from English Tissue simulation ultrasonic Phantom, namely a human physical model simulating soft Tissue in the aspect of ultrasonic propagation characteristics, and is a passive testing device which is composed of an ultrasonic Tissue simulation material (TM material for short), a plurality of testing targets embedded in the material, an acoustic window, a shell, an indicating decoration panel and the like. The tissue-imitated ultrasonic body model is specified equipment for executing national technical standards and metrological verification procedures, and has the characteristics of a standard device.
With the development of electronic technology and biomedical engineering, more and more medical ultrasonic-based diagnosis and treatment methods and equipment appear. Such as ultrasonic computed tomography (USCT), which is a promising technique for early breast tumor detection and diagnosis. The technology scans and images the mammary gland in a water tank through a ring array ultrasonic transducer, and the imaging modes comprise a B ultrasonic mode using ultrasonic reflected wave signals, an acoustic velocity measurement imaging mode using transmitted wave signals and an acoustic attenuation mode. The ultrasonic scanning tomography can be realized in various ways, such as forming a series of tomography images through longitudinal mechanical scanning of an annular array, forming tomography images after mechanical scanning of a plurality of pairs of transducers and spatial sampling, or performing electronic scanning tomography by using a spatial semi-ellipsoidal array transducer. The ultrasonic tomography device generally uses deaerated water as a coupling medium between a transducer and a human body, is mainly used for three-dimensional ultrasonic scanning imaging of breasts, and can also be used for tomography imaging of limbs and other parts.
All of the meters used for quality testing are periodically certified or calibrated as required by the medical instrument manufacturing industry and professional quality testing agencies quality systems. The tissue-imitated ultrasonic phantom belongs to a tissue substitute and is not a measuring instrument, a standard device in the sense of metrology does not exist, and the metrological verification or calibration cannot be implemented, but a rule of regular detection and comparison is formed from the end of the last century because the quality of ultrasonic diagnostic equipment is directly influenced, and the rule is accepted and followed by related fields. As an ultrasonic tomography imaging device of a medical instrument, a tissue-imitated phantom is supposed to be used for imaging performance and quality inspection. At present, aiming at the novel USCT ultrasonic equipment, the current tissue-imitating body model is not suitable for detecting the performance of the USCT ultrasonic equipment any more.
Disclosure of Invention
The invention aims to overcome the technical defects and provides a tissue-imitated body model for detecting the imaging uniformity of an ultrasonic tomography device, which can be specially used for inspecting the imaging uniformity of the ultrasonic tomography device and is an ultrasonic passive device.
In order to achieve the above object, the present invention provides a tissue phantom for detecting imaging uniformity of an ultrasonic tomography apparatus, wherein the tissue phantom is in a shape of a circular truncated cone, and comprises: a phantom shell, an acoustic window, a supporting plate, a background tissue-imitating material and a plurality of target lines; the phantom shell is formed by fixedly connecting an upper panel, a lower panel and a supporting plate, the phantom shell and an acoustic window which is stuck and connected with the side surface of the circular truncated cone form a closed space, the closed space is filled with a background tissue imitation material, and each target line vertically penetrates through the lower panel from the upper panel and is embedded in the background tissue imitation material; an inlet filled with a background tissue-imitating material is formed in the supporting plate, and a plugging rubber is attached to the inlet; and a supporting and protecting plate is fixed outside the supporting plate.
As an improvement of the device, the phantom housing and the supporting plate are made of hard structural plastics.
As an improvement of the device, the sound window adopts a polyester film with the thickness of 50-100 mu m.
As an improvement of the device, the acoustic window is connected with the upper panel, the lower panel and the supporting plate, and the included angle between the tangent plane of the acoustic window and the lower panel ranges from 60 degrees to 90 degrees.
As a modification of the above device, a first support column and a second support column are arranged between the upper panel and the lower panel; the first support column is sleeved with a first sound absorption sleeve, the second support column is sleeved with a second sound absorption sleeve, and the first sound absorption sleeve and the second sound absorption sleeve are made of sound absorption materials.
As an improvement of the device, the inlet on the supporting plate is a round hole and is blocked by a blocking rubber, and the blocking rubber is made of a vacuum rubber.
As an improvement of the device, the background tissue-imitating material is a water-based polymer gel-based composite material, the background tissue-imitating material is maintained by a maintenance liquid, and the maintenance liquid is injected by a plugging rubber.
As an improvement of the device, a plurality of target line openings are arranged at the corresponding positions of the upper panel and the lower panel and used for positioning a plurality of target lines, two ends of each target line penetrate through the corresponding target line openings on the upper panel and the lower panel and are fixed on the upper surface of the upper panel and the lower surface of the lower panel, and the target lines are nylon lines with the diameter of 0.1mm-0.3 mm.
As an improvement of the above device, the target lines are divided into circle center uniformity target lines, 3 middle circle uniformity target groups and 3 outer circle uniformity target groups, and the circle center uniformity target lines pass through the circle center of the upper panel and the circle center of the lower panel; the target line of the middle ring uniformity target group vertically penetrates through the distance r between the upper panel and the lower panel from the circle center1On the arc of (1) and is uniformly distributed, r1The value range of (A) is 20mm-50 mm; the target line of the outer ring uniformity target group vertically penetrates through the distance r between the upper panel and the lower panel from the circle center2On the arc of (1) and is uniformly distributed, r2The value range of (A) is 50mm-90 mm.
As an improvement of the device, the supporting plate is provided with two countersunk head screw holes, the supporting plate is correspondingly provided with two countersunk head screw holes, and the supporting plate are fixed together through a first fixing bolt and a second fixing bolt.
The invention has the advantages that:
1. compared with the prior similar products, the tissue-imitated phantom designed and manufactured according to the invention is specially used for detecting and evaluating the imaging uniformity and the focus discovery capability of the ultrasonic tomography equipment;
2. by the design of the inclined plane sound window, the invention avoids the false image caused by multiple reflections between the transducer and the sound window;
3. according to the invention, by designing the distribution of the target lines, the lateral (circumferential) imaging uniformity and the axial (radial) imaging uniformity of the ultrasonic tomography imaging equipment for scanning and imaging of the annular array in different directions of the circumference can be detected and measured;
4. the tissue-imitating body model has original maintainability, and the service life of the body model can be greatly prolonged by regular maintenance and injection maintenance.
Drawings
FIG. 1 is a side external view of a phantom of tissue of the present invention for imaging uniformity detection in an ultrasonic tomography device;
FIG. 2 is a perspective view of the interior of a silent window of a mock tissue phantom of the present invention for ultrasound tomography imaging uniformity detection;
FIG. 3 is a side cutaway view of a phantom of tissue of the present invention for imaging uniformity detection in an ultrasonic tomography device;
FIG. 4 is a front top view of a phantom of the invention used for imaging uniformity detection in an ultrasonic tomography device;
figure 5 is a schematic diagram of a tissue phantom simulated embodiment of the invention for use in imaging uniformity detection in an ultrasonic tomography device.
Reference numerals:
1. tissue phantom 2, upper panel 3 and acoustic window
4. Target line 6, supporting plate 8 and lower panel
10. Supporting plate 11, round hole 12 and plugging rubber
14. Background tissue-like material 15, annular array transducer
41. Outer ring uniformity target group 42 and middle ring uniformity target group
43. Target line with uniform circle center
51. First support column 52, second support column
71. First fixing bolt 72 and second fixing bolt
91. First sound-absorbing sleeve 92, second sound-absorbing sleeve
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
All of the meters used for quality testing are periodically certified or calibrated as required by the medical instrument manufacturing industry and professional quality testing agencies quality systems. The ultrasonic tissue-imitating body model belongs to a tissue substitute, and has formed a rule of regular detection and comparison from the end of the last century because the ultrasonic tissue-imitating body model directly influences the judgment on whether the quality of ultrasonic diagnostic equipment is qualified or not, and is recognized and followed by various related fields. The product corresponding to the invention is used for quality detection and evaluation of the ultrasonic tomography equipment and imaging uniformity detection of the ultrasonic imaging equipment.
The tissue-imitating body model is used specially for detecting and evaluating the comprehensive imaging performance and focus discovering ability of ultrasonic tomography imaging equipment and is one passive ultrasonic device for ensuring the quality of medical ultrasonic equipment. Ultrasonic computed tomography (USCT) generally uses a ring array ultrasonic transducer to scan and image a human body (such as breast) in a water tank, and the imaging modes include a B-mode using ultrasonic reflected wave signals, a sound velocity measurement imaging mode using transmitted wave signals, and an acoustic attenuation mode. The ultrasonic scanning tomography can be realized in various ways, such as forming a series of tomography images through longitudinal mechanical scanning of an annular array, forming tomography images after mechanical scanning of a plurality of pairs of transducers and spatial sampling, or performing electronic scanning tomography by using a spatial semi-ellipsoidal array transducer. The ultrasonic tomography device generally uses deaerated water as a coupling medium between a transducer and a human body, is mainly used for three-dimensional ultrasonic scanning imaging of breasts, and can also be used for tomography imaging of limbs and other parts.
As shown in fig. 1 and fig. 2, the invention provides a Tissue phantom for detecting imaging uniformity of an ultrasonic tomography device, wherein the Tissue phantom 1 is in a circular truncated cone shape and mainly comprises a phantom housing, a supporting plate 6, an acoustic window 3, a plurality of target lines 4 and a background Tissue-simulating Material (TMM) 14. The upper panel 2 and the lower panel 8 form the upper and lower surfaces of the circular truncated cone shape. The phantom shell consists of an upper panel 2, a lower panel 8, a first supporting column 51, a second supporting column 52 and a supporting plate 10, and the phantom shell and the supporting plate 6 are made of hard structural plastics; preferably, the rigid structural plastic is organic glass (PMMA, chemical name is polymethyl methacrylate) material, and may be other structural plastics, such as ABS acrylonitrile-butadiene-styrene terpolymer, polyvinyl chloride plastic, and the like. The upper panel 2 and the lower panel 8 form the upper and lower surfaces of the circular truncated cone shape. The phantom shell is formed by gluing an upper panel 2, a lower panel 8, a first supporting column 51, a second supporting column 52 and a supporting plate 10, a closed space is formed together with a sound window 3 pasted on the side surface, a background tissue imitating material 14 is filled in the closed space, the sound window 3 is connected with the upper panel 2, the lower panel 8 and the supporting plate 10, the included angle range of the tangent plane of the sound window 3 and the lower panel 8 is 60-90 degrees, the angle of the included angle is determined by the surface distance between the sound window 3 and a transducer and the size of the longitudinal direction of the transducer, and the angle is used for avoiding multiple reflections between the sound window 3 and the transducer. The first support column 51 and the second support column 52 are sleeved between the upper panel 2 and the lower panel 8; the first and second support columns 51 and 52 are sleeved with a first sound-absorbing sleeve 91 and a second sound-absorbing sleeve 92, and the materials are sound-absorbing materials for absorbing incident sound waves and avoiding multiple reflection artifacts caused by reflected sound waves. The outer sides of the upper panel 2 and the lower panel 8 are marked with the positions of a plurality of target lines 4. The acoustic window 3 is made of a polyester film material with the thickness of 50-100 mu m and is used for simulating the acoustic characteristics of human epidermal tissues.
The background tissue-imitating material 14 is a material for imitating acoustic parameters of human soft tissues, the material is a water-based polymer gel matrix composite material, the sound velocity of the background tissue-imitating material 14 is (1540 +/-10) m/s, the slope of the acoustic attenuation coefficient of the background tissue-imitating material 14 is (0.7 +/-0.05) dB/(cm & MHz), and the tissue-imitating material parameters are values measured under the condition that the temperature is [ (23 +/-3) DEG C ].
The position that top panel 2 and lower panel 8 correspond is opened has a plurality of target line trompils, and preferred diameter is 0.3mm for many target lines 4 of location, and target line 4 is the nylon wire of diameter 0.1mm-0.3mm, and every target line 4 all runs through to lower panel 8 from top panel 2 perpendicularly, and 4 both ends of target line are fixed respectively in top panel 2 and outside one side of lower panel 8, and every target line 4 has the same pulling force so that target line 4 evenly tightens. The position of the target line 4 and the size of the hole are machined by a precision numerical control machine tool so as to ensure the precision of the positioning and the spacing of the hole.
As shown in FIG. 3, a circular hole 11 is formed in the center of the supporting plate 10 to serve as a passage for filling the background tissue-imitating material 14. The round hole 11 is blocked by a blocking rubber 12 with excellent elasticity, the material of the round hole is a vacuum rubber, and the round hole is used as an injection and air suction inlet during the maintenance of the imitated tissue material.
Two countersunk head screw holes are formed in the supporting plate 6, two identical countersunk head screw holes are formed in the corresponding positions of the supporting plate 10, the first fixing bolt 71 penetrates through one countersunk head screw hole of the supporting plate 6 and the corresponding countersunk head screw hole in the supporting plate 10, the second fixing bolt 72 penetrates through the other countersunk head screw hole of the supporting plate 6 and the corresponding countersunk head screw hole in the supporting plate 10, and therefore the supporting plate 6 and the supporting plate 10 are fixed together. The support plate 6 plays a role in supporting and keeping the phantom steady for the tissue-mimicking phantom.
The tissue-imitating material 14 is a core part of the ultrasonic phantom, and the functional failure is caused by the variation of the composition, the state and the acoustic characteristics of the tissue-imitating material, the tissue-imitating material of the ultrasonic tissue-imitating phantom has maintainability, liquid contained in the tissue-imitating material can be evaporated and lost through gaps of a shell of the phantom, the tissue-imitating material can lose water and shrink after the phantom is used for a long time, and the phantom can be completely failed and cannot be recovered under the condition of severe water loss. The tissue-imitating material can be maintained daily by using an aqueous maintenance solution, and the aqueous maintenance solution can be injected by using an injection needle through the bottom closed rubber 12 at the bottom; the aqueous maintenance liquid is specially prepared for the tissue-imitating material. The daily maintenance period is related to the temperature and humidity environment of the phantom. The service life of the phantom can be greatly prolonged by daily supplementing and maintaining liquid for maintenance.
As shown in fig. 4, the target line 4 is embedded in the background tissue-imitated material 14, and the target line 4 is divided into different target groups according to different purposes, including an outer circle uniformity target group 41, a middle circle uniformity target group 42, and a circle center uniformity target line 43, and is used for detecting the imaging uniformity of the ultrasonic tomography device for scanning and imaging the annular array in different circumferential directions.
The circle center uniformity target line 43 passes through the circle center of the upper panel 2 and the circle center of the lower panel 8; the target line of the middle ring uniformity target group 42 vertically passes through the upper panel 2 and the lower panel 8 and is away from the circle center r1On the arc of (1) and is uniformly distributed, r1The value range of (A) is 20mm-50 mm; the target line of the outer ring uniformity target group 41 vertically passes through the upper panel 2 and the lower panel 8 and is away from the circle center r2On the arc of (1) and is uniformly distributed, r2Has a value range of 50mm-90mm
Fig. 5 is a schematic diagram of the tissue phantom used for detecting the imaging performance of an ultrasonic tomography imaging device, and the whole structure is in a closed or semi-closed water tank, and degassing treatment is usually required. The device in the embodiment uses a circular array transducer 20, i.e. the transducer is arranged in a partial or full circular arc. The phantom 1 is placed in water, typically with the lower panel 8 placed on a horizontal platform submerged in water. It is often necessary to have the water level of the water bath for ultrasonic coupling higher than the top panel of the phantom. The center of the phantom is ensured to coincide with the center of the transducer, and measures are taken to remove bubbles attached to the acoustic window. Starting imaging equipment, setting the imaging equipment in a transmitting-receiving state of all array elements, adjusting the upper and lower positions of an ultrasonic probe, and enabling a radiation surface to be aligned with a phantom acoustic window to obtain a two-dimensional image of a material and a structure in a phantom;
circumferential geometric position accuracy (geometric error) measurement: completely displaying and freezing the images of each target group, measuring the distance between adjacent target lines in each target group one by using an electronic vernier ranging system configured by the detected instrument, and finding out the x with the maximum difference between the measured value and the nominal value (10mm) of the phantomiNominal value x as given when phantom leaves factory0Then, the formula for calculating the accuracy of the circumferential geometric positions at positions 20mm and 50mm away from the acoustic window is as follows:
|(xi-x0)/x0|×100％
circumferential uniformity (standard deviation) measurement: completely displaying the images of the outer circle uniformity target group and the middle circle uniformity target group, freezing, and measuring the distance between adjacent target lines in each target group one by using an electronic vernier ranging system configured by a detected instrument to be yiAnd ziI is 1, 2, 3, … … n, and the average value of the measured values of the outer circle uniformity target group is ypAnd zpThen, the formula for calculating the circumferential uniformity is respectively as follows:
Figure BDA0002306408840000061
after the test, the mold is taken out of the water and the surface is wiped off with a soft towel or the like.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. The utility model provides a imitate tissue phantom that is used for supersound tomography equipment formation of image homogeneity to detect which characterized in that, imitate the tissue phantom and be the round platform form, include: a phantom shell, an acoustic window (3), a support plate (6), a background tissue imitating material (14) and a plurality of target lines (4); the phantom shell is formed by fixedly connecting an upper panel (2), a lower panel (8) and a supporting plate (10), the phantom shell and a sound window (3) which is stuck and connected with the side surface of the circular truncated cone form a closed space, a background tissue imitating material (14) is filled in the closed space, and each target line (4) vertically penetrates through the lower panel (8) from the upper panel (2) and is embedded in the background tissue imitating material (14); an inlet for filling a background tissue-imitating material (14) is formed in the supporting plate (10), and a plugging rubber is attached to the inlet; and a supporting and protecting plate (6) is fixed outside the supporting plate (10).
2. The tissue phantom according to claim 1, wherein the phantom housing and the support plate (6) are both made of rigid structural plastic.
3. The phantom according to claim 1, wherein the acoustic window (3) is a 50-100 μm thick polyester film.
4. The tissue-mimicking phantom according to claim 3, wherein the acoustic window (3) is connected to the upper panel (2), the lower panel (8) and the support plate (10), and an angle between a tangent plane of the acoustic window (3) and the lower panel (8) is in a range of 60 ° to 90 °.
5. The tissue phantom according to claim 1, characterized in that a first support column (51) and a second support column (52) are provided between the upper panel (2) and the lower panel (8); the first support column (51) is sleeved with a first sound absorption sleeve (91), the second support column (52) is sleeved with a second sound absorption sleeve (92), and the first sound absorption sleeve (91) and the second sound absorption sleeve (92) are made of sound absorption materials.
6. The tissue phantom according to claim 1, wherein the inlet of the support plate (10) is a circular hole (11) and is blocked by a blocking rubber (12), and the blocking rubber (12) is made of a vacuum rubber.
7. The tissue phantom according to claim 6, wherein the background tissue-mimicking material (14) is an aqueous polymer gel-based composite material, and the background tissue-mimicking material (14) is maintained by a maintenance fluid injected through the plugging rubber (12).
8. The tissue-imitating phantom according to claim 1, wherein a plurality of target line openings are arranged at corresponding positions of the upper panel (2) and the lower panel (8) for positioning a plurality of target lines (4), two ends of each target line (4) penetrate through the corresponding target line openings of the upper panel (2) and the lower panel (8) and are fixed on the upper surface of the upper panel (2) and the lower surface of the lower panel (8), and the target lines (4) are nylon lines with diameters of 0.1mm-0.3 mm.
9. The tissue phantom according to claim 8, wherein the plurality of target lines are divided into circle center uniformity target lines (43), 3 middle circle uniformity target groups (42) and 3 outer circle uniformity target groups (41), the circle center uniformity target lines (43) passing through the circle center of the upper panel (2) and the circle center of the lower panel (8); the target line of the middle ring uniformity target group (42) vertically penetrates through the upper panel (2) and the lower panel (8) and is away from the circle center r1On the arc of (1) and is uniformly distributed, r1The value range of (A) is 20mm-50 mm; the target line of the outer ring uniformity target group (41) vertically penetrates through the upper panel (2) and the lower panel (8) and is away from the circle center r2On the arc of (1) and is uniformly distributed, r2The value range of (A) is 50mm-90 mm.
10. The tissue phantom according to claim 1, wherein the supporting plate (6) is provided with two countersunk screw holes, the supporting plate (10) is correspondingly provided with two countersunk screw holes, and the supporting plate (10) and the supporting plate (6) are fixed together through a first fixing bolt (71) and a second fixing bolt (72).
CN201911241635.XA 2019-12-06 2019-12-06 Tissue-imitated phantom for detecting imaging uniformity of ultrasonic tomography equipment Pending CN110742650A (en)

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