CN107544041B - Magnetic resonance imaging test phantom assembly - Google Patents
Magnetic resonance imaging test phantom assembly Download PDFInfo
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Abstract
The invention provides a magnetic resonance imaging test phantom assembly, which comprises a plurality of modules which are sequentially arranged at intervals in the axial direction (the vertical direction), wherein each module is used for completing the image quality test of one or more magnetic resonance imaging systems. Compared with the prior art, the test phantom provided by the invention can be used in one or more arbitrary combinations, and a plurality of combinations form a so-called comprehensive test phantom. The comprehensive testing die body organically integrates all the testing modules into one die body, so that the testing and carrying are convenient, and the quality control and quality guarantee of the magnetic resonance equipment in a hospital are also convenient. The comprehensive test die body enables the environment of the solution where each test module is located to be uniform, test conditions are unified, and test data are comparable.
Description
Technical Field
The invention relates to the field of magnetic resonance imaging, in particular to a magnetic resonance imaging test phantom assembly.
Background
Magnetic resonance imaging test phantoms play a very important role in performance testing, Quality Control (QC) and Quality Assurance (QA) of magnetic resonance systems, and various magnetic resonance test phantoms exist at present and are used for different test items and test methods.
A general test phantom is usually only specific to a specific test item or test method, so that a plurality of phantoms are usually required to be used for comprehensively evaluating a certain magnetic resonance device, which is inconvenient for testing and carrying, and errors or even errors are introduced into test results due to changes in load caused by different phantoms and different formulations. A comprehensive test phantom combining various test modules can solve such problems.
There are today international Magphan SMR series phantoms of the American Association of physics in Medicine (AAPM) and ACR MRI phantom of the American College of Radiology (ACR) which both correspond to their respective standards for magnetic resonance testing, but neither of these institutional standards has yet to be fully introduced into the country.
The current domestic standard for measuring the image quality parameters of the magnetic resonance equipment, YY/T0482-2010, measurement of main image quality parameters of medical imaging magnetic resonance equipment, is IEC62464-1:2007 converted from the International Electrotechnical Commission (IEC), and mainly measures six parameters of signal-to-noise ratio, uniformity, layer thickness of two-dimensional scanning, spatial resolution, two-dimensional geometric distortion and ghost, but currently, a comprehensive test phantom aiming at one or more of the standards is lacked.
Disclosure of Invention
In order to solve the above problems, the present invention provides a magnetic resonance imaging test phantom assembly.
A magnetic resonance imaging test phantom assembly comprises a plurality of modules which are sequentially arranged at intervals in the axial direction (up-down direction), each module is used for completing the image quality test of one or more magnetic resonance imaging systems, the magnetic resonance imaging test phantom assembly comprises a first module for testing geometric distortion, a first carrier comprising a plate-shaped structure, a first channel extending along a first direction and a second channel extending along a second direction are arranged on the first carrier, the first channel and the second channel are intersected and form a grid structure, and a hole-shaped structure extending along a third direction is arranged at the intersection of the first channel and the second channel.
Preferably, the first direction and the second direction are perpendicular.
Preferably, the hole-type structures penetrate through the upper and lower surfaces of the first carrier.
Preferably, the width of the first channel and the second channel ranges from 1mm to 2mm, and the depth ranges from 5mm to 15 mm.
Preferably, the third direction is perpendicular to the first direction and the second direction.
Preferably, the grid cells in the grid structure have the same size in the first and second directions.
Preferably, a second module for testing ghosting is included, the second module including a second carrier on which one or more hole-type structures are disposed.
Preferably, the diameter of the hole-type structure on the second carrier is greater than or equal to 50 mm.
Preferably, a third module for testing the spatial resolution is included, the third module comprising a third carrier, the third carrier having an array of apertures disposed thereon.
Preferably, there are at least 5 groups of 4 x 4 arrays of orifices included.
Preferably, the small holes are circular holes, and the diameter of each small hole is 0.4mm-2 mm.
Preferably, the test device further comprises a fourth die body for testing the spatial resolution, wherein the fourth die body comprises a fourth carrier and a plurality of groups of modules, and each group of modules is fixedly arranged on the fourth carrier.
Preferably, each group of modules is of an equally spaced lamellar structure, the spacing is 1mm-3mm, and the thickness of the lamellar is 0.5-2 mm.
Preferably, the test device further comprises a fifth mold body for testing the thickness of the layer, wherein the fifth mold body comprises a fifth carrier and a wedge-shaped structure, and the wedge-shaped structure is fixedly arranged on the fifth carrier.
Preferably, the wedge-shaped structures comprise two wedge-shaped structures, and the angle between the inclined surface and the bottom surface of the two wedge-shaped structures is 10-12 degrees.
Preferably, a sixth phantom for testing signal-to-noise ratio and/or homogeneity is further included, the sixth phantom comprising an interior region filled with a solution for generating magnetic resonance signals.
Preferably, the inner diameter of the inner region of the sixth mold body is 180mm to 220 mm.
In contrast to the prior art, the test phantom provided above may be used in any combination of one or more, a plurality of which form a so-called composite test phantom. The comprehensive testing die body organically integrates all the testing modules into one die body, so that the testing and carrying are convenient, and the quality control and quality guarantee of the magnetic resonance equipment in a hospital are also convenient. The comprehensive test die body enables the environment of the solution where each test module is located to be uniform, test conditions are unified, and test data are comparable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions and advantages of 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 other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural view of a test phantom assembly for magnetic resonance imaging according to the present invention;
FIG. 2 is a schematic view of a first mold body according to the present invention;
FIG. 3 is a schematic view of a second mold body according to the present invention;
FIG. 4 is a schematic representation of the structure of a third mold body according to the present invention;
FIG. 5 is a schematic view of a fourth mold body according to the present invention;
FIG. 6 is a schematic structural view of a fifth mold body according to the present invention;
FIG. 7 is a schematic view of a sixth mold body according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, a magnetic resonance imaging test phantom assembly 900 includes a plurality of modules spaced apart in an axial direction (up-down direction), and each module is configured to perform one or more image quality tests of a magnetic resonance imaging system.
As shown in fig. 2, the mri test phantom assembly 900 includes a first module 10 for testing geometric distortion, the first phantom 10 includes a first carrier 101 having a plate-like structure, and having a first channel 1011 extending in a first direction and a second channel 1012 extending in a second direction, and the first channel and the second channel intersect and form a grid structure, wherein the first direction is perpendicular to the second direction. In one embodiment, the width of the first channel and the second channel ranges from 1mm to 2mm, and the depth ranges from 5mm to 15 mm. In one embodiment, the grid cells in the grid structure are the same size in the first direction and the second direction. The thickness of the carrier is 10mm-30 mm.
A hole type structure 1013 extending along a third direction is arranged at the intersection of the first channel and the second channel. The hole-type structure penetrates through the upper surface and the lower surface of the first carrier, and the third direction is perpendicular to the first direction and the second direction.
In practical applications, the first mold body 10 is formed by processing a chessboard-like square grid on a material that does not generate a magnetic resonance signal, where the edges of the grid are half-through slots and the vertices are full-through holes, so that the edges and vertices of the grid can be clearly distinguished during scanning, and measurement is facilitated.
As shown in fig. 3, the magnetic resonance imaging test phantom assembly 900 includes a second module 20 for testing ghosting, the second module including a second carrier 201 on which one or more hole-type structures are disposed, the diameter of the hole-type structures on the second carrier being greater than or equal to 50 mm. As shown in fig. 3, in the present embodiment, the second carrier is provided with 2 hole-type structures, which are through holes or non-through holes.
As shown in fig. 4, the mri test phantom assembly 900 includes a third module 30 for testing spatial resolution, the third module 30 including a third carrier 301 having an array of apertures 302 disposed thereon. In one embodiment, said third carrier 301 is provided with at least 5 sets 4 x 4 of arrays of pores. In one embodiment, the apertures are circular holes having a diameter of 0.4mm to 2 mm. In one embodiment, the aperture pitch of each set is equal to the aperture diameter.
When testing, the theoretical pixel size of the magnetic resonance image needs to be set to be smaller than or equal to the diameter of the small hole, and if two small holes separated from the same group can be distinguished in the scanned image, the resolution of the magnetic resonance system is considered to be equal to or better than the diameter of the group of small holes. The purpose of the matrix is to measure the spatial resolution in two mutually perpendicular directions in one scan. The testing method adopting the small hole array is a very practical method, and the wide applicability of the die body testing assembly is improved.
As shown in fig. 5, the magnetic resonance imaging test phantom assembly 900 includes a fourth phantom 40 for testing spatial resolution, the fourth phantom includes a fourth carrier 401 and a plurality of sets of modules 402, and each set of modules 402 is fixedly disposed on the fourth carrier 401. Each set of modules 402 is a structure of equally spaced sheets, in one embodiment, the spacing is between 1mm and 3mm, and the thickness of the sheets is between 0.5 and 2 mm.
The third mold body and the fourth mold body for testing the spatial resolution are respectively a porous model and a periodic model. According to the degree that each module is easy to be attached with bubbles when being filled with solution and the convenience of using a bubble removing tool, the hole-shaped module and the periodic pattern module with the spatial resolution are placed at the position close to the water filling port.
As shown in fig. 6, the magnetic resonance imaging test phantom assembly 900 includes a fifth phantom 50 for testing a layer thickness, where the fifth phantom 50 includes a fifth carrier 501 and a wedge structure 502, and the wedge structure 501 is fixedly disposed on the fifth carrier 501. In one embodiment, the fifth mold body comprises two wedge-shaped structures, and the angle between the inclined surface and the bottom surface of the two wedge-shaped structures is 10-12 degrees.
As shown in fig. 7, the magnetic resonance imaging test phantom 900 includes a sixth phantom 60 for testing signal-to-noise ratio and/or homogeneity, the sixth phantom 60 including an interior region 601, the interior region 601 filled with a solution for generating magnetic resonance signals, in one embodiment, the interior region of the sixth phantom has an inner diameter of 180mm to 220 mm.
The six molded bodies may be used in any combination of one or more, and a plurality of the molded bodies may be used in combination to form a so-called integrated test molded body. The comprehensive testing die body organically integrates all the testing modules into one die body, so that the testing and carrying are convenient, and the quality control and quality guarantee of the magnetic resonance equipment in a hospital are also convenient. The comprehensive test die body enables the environment of the solution where each test module is located to be uniform, test conditions are unified, and test data are comparable.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (14)
1. A magnetic resonance imaging tests die body subassembly, includes several modules of interval arrangement in proper order in upper and lower direction, and each module is used for accomplishing one or more magnetic resonance imaging system's image quality test, its characterized in that: the test device comprises a first module for testing geometric distortion, a first carrier with a plate-shaped structure, a second carrier with a plate-shaped structure, a first channel and a second channel, wherein the first channel extends along a first direction, the second channel extends along a second direction, the first direction is vertical to the second direction, the first channel and the second channel are crossed to form a grid structure, a hole-shaped structure extending along a third direction is arranged at the crossed point of the first channel and the second channel, the hole-shaped structure penetrates through the upper surface and the lower surface of the first carrier, and the third direction is vertical to the first direction and the second direction;
the grid structure is a chessboard-like square grid, the edges of the chessboard-like square grid are semi-through grooves, the top points of the chessboard-like square grid are full-through holes, and the chessboard-like square grid is in a ladder shape at the four corners.
2. The magnetic resonance imaging test phantom assembly according to claim 1, wherein said first and second channels have a width in the range of 1mm to 2mm and a depth in the range of 5mm to 15 mm.
3. The magnetic resonance imaging test phantom assembly according to claim 1, wherein the grid cells in said grid structure are of the same size in the first and second directions.
4. The magnetic resonance imaging test phantom assembly of claim 1, comprising a second module for testing ghosting, the second module comprising a second carrier having one or more hole-type structures disposed thereon.
5. The magnetic resonance imaging test phantom assembly according to claim 4, wherein the diameter of the hole-type structures on the second carrier is equal to or greater than 50 mm.
6. The magnetic resonance imaging test phantom assembly of claim 1, including a third module for testing spatial resolution, said third module including a third carrier, said third carrier having an array of apertures disposed thereon.
7. The magnetic resonance imaging test phantom assembly according to claim 6, comprising at least 5 sets of 4 x 4 arrays of apertures.
8. The mri test phantom assembly of claim 6, wherein said apertures are circular apertures having a diameter of 0.4mm to 2 mm.
9. The magnetic resonance imaging test phantom assembly of claim 1, further comprising a fourth phantom for testing spatial resolution, the fourth phantom comprising a fourth carrier and a plurality of sets of modules, each set of modules fixedly disposed on the fourth carrier.
10. The mri test phantom assembly of claim 9, wherein each set of modules is of an equally spaced lamellar structure, said spacing being between 1mm and 3mm, said lamellae having a thickness of between 0.5 and 2 mm.
11. The magnetic resonance imaging test phantom assembly of claim 1, further comprising a fifth phantom for testing layer thickness, the fifth phantom including a fifth carrier and a wedge structure fixedly disposed on the fifth carrier.
12. The magnetic resonance imaging test phantom assembly according to claim 11, comprising two wedge-shaped structures having a slope at an angle of 10 ° -12 ° to the bottom surface.
13. The magnetic resonance imaging test phantom assembly according to claim 1, further comprising a sixth phantom for testing signal-to-noise ratio and/or homogeneity, said sixth phantom comprising an interior region filled with a solution for generating magnetic resonance signals.
14. The magnetic resonance imaging test phantom assembly according to claim 13, wherein the interior region of the sixth phantom has an inner diameter of 180mm to 220 mm.
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| CN108828484A (en) * | 2018-05-25 | 2018-11-16 | 中国计量科学研究院 | A kind of Quality Control die body of magnetic resonance imager |
| CN109009114B (en) * | 2018-08-08 | 2021-04-23 | 北京市计量检测科学研究院 | Image performance detection device of three-azimuth magnetic resonance imaging equipment |
| CN109350865B (en) * | 2018-11-26 | 2020-06-09 | 泰山医学院 | Magnetic resonance guided imaging quality control phantom of radiotherapy system |
| CN109782202B (en) * | 2018-12-14 | 2020-05-15 | 天津大学 | Static magnetic resonance test body model system |
| CN109782203B (en) * | 2018-12-14 | 2020-07-31 | 天津大学 | Dynamic magnetic resonance test body model system |
| CN109633504B (en) * | 2018-12-14 | 2020-05-15 | 天津大学 | Dynamic-static composite magnetic resonance test body model system |
| CN109709505A (en) * | 2018-12-27 | 2019-05-03 | 潍坊新力超导磁电科技有限公司 | A kind of moisture film for superconducting magnetic resonance equipment |
| CN109856174B (en) * | 2018-12-27 | 2020-01-31 | 潍坊新力超导磁电科技有限公司 | line pair type high contrast resolution testing assembly and slide fixing device thereof |
| CN111696047B (en) * | 2019-03-14 | 2023-08-22 | 四川中测辐射科技有限公司 | Imaging quality determining method and system of medical imaging equipment |
| DE102019112313A1 (en) | 2019-05-10 | 2020-11-12 | MRI-STaR - Magnetic Resonance Institute for Safety, Technology and Research GmbH | Test specimen for analyzing and monitoring the image quality of MR tomographs |
| CN111257816B (en) * | 2020-04-07 | 2021-07-30 | 江苏力磁医疗设备有限公司 | Gel mold for simulating cerebral hemorrhage and preparation method and application thereof |
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| JP3419889B2 (en) * | 1994-06-09 | 2003-06-23 | 株式会社日立メディコ | Magnetic resonance imaging equipment |
| CN201259533Y (en) * | 2008-09-23 | 2009-06-17 | 王国柱 | A magnetic resonance quality control integrated test phantom |
| CN102478650B (en) * | 2010-11-29 | 2014-02-12 | 泰山医学院 | Small-sized desktop type magnetic resonance quality control and comprehensive test phantom |
| CN203149106U (en) * | 2013-01-31 | 2013-08-21 | 上海联影医疗科技有限公司 | Testing device used for magnetic resonance imaging |
| CN103356194B (en) * | 2013-08-03 | 2015-01-28 | 南方医科大学 | Positioning component of multi-parameter testing phantom for magnetic resonance quality control and testing phantom |
| CN203365665U (en) * | 2013-08-03 | 2013-12-25 | 康立丽 | Magnetic resonance quality control multiparameter testing phantom |
| CN203591259U (en) * | 2013-09-24 | 2014-05-14 | 西门子(深圳)磁共振有限公司 | Die body of magnetic resonance imaging system |
| CN203720341U (en) * | 2013-12-09 | 2014-07-16 | Ge医疗系统环球技术有限公司 | Test die and magnetic resonance device |
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