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CN-224220154-U - Correction device for registration accuracy of multi-modality imaging system

CN224220154UCN 224220154 UCN224220154 UCN 224220154UCN-224220154-U

Abstract

The application provides a correction device for registration accuracy of a multi-modality imaging system. The correction device comprises a support and at least four point sources, wherein the support comprises at least four supporting rods, a point source accommodating part is arranged on each supporting rod, a virtual three-dimensional structure is formed at the top of each supporting rod, each point source accommodating part is respectively positioned at the position of one top, the at least four point sources are respectively accommodated in the at least four point source accommodating parts, the point sources are made of high-density materials with solution adsorption capacity, and when the correction device is used for correcting a multi-mode imaging system, each point source absorbs radioactive source solution. The correction device provided by the application comprises the point source with the solution adsorption capacity, the point source can fully absorb the radioactive source solution to form the radioactive point source, the high density characteristic of the point source can replace contrast agent to image under CT scanning, the mixed solution of the radioactive source and the contrast agent is not needed, and the correction effect is very good.

Inventors

  • REN HONGPING
  • YIN LI
  • DAI MEILING
  • Xu Wangchu

Assignees

  • 滨松光子科技(廊坊)有限公司

Dates

Publication Date
20260512
Application Date
20250417

Claims (9)

  1. 1. A correction apparatus for registration accuracy of a multi-modality imaging system, comprising: the bracket comprises at least four supporting rods, wherein each supporting rod is provided with a point source accommodating part, the tops of the at least four supporting rods form a virtual three-dimensional structure, each point source accommodating part is respectively positioned at one top part, and And at least four point sources respectively accommodated in the at least four point source accommodating parts, wherein the point sources are made of high-density materials with solution adsorption capacity, and each point source absorbs radioactive source solution when the multi-mode imaging system is corrected by using the correction equipment.
  2. 2. The correction device according to claim 1, characterized in that the high density material is a material with micro-pores dispersed in a matrix; Optionally, the point source is made of at least one of medical stone, montmorillonite, kaolinite, illite, and synthetic molecular sieve.
  3. 3. Correction device according to claim 1 or 2, characterized in that the point source is a sphere, the volume of which is less than or equal to 10mm 3 ; Optionally, the volume difference of any two of the point sources is within a predetermined range.
  4. 4. The correction device according to claim 1 or 2, characterized in that the support further comprises a central support block, on which at least four of the struts are fixed according to the distribution of the virtual solid structure; optionally, the volume of the virtual stereo structure is greater than or equal to 4 times the volume of the central support block; Optionally, the virtual three-dimensional structure is a polyhedron, and the central supporting block is a sphere or a polyhedron with the same shape as the virtual three-dimensional structure; Optionally, a threaded hole is formed in a portion, connected with the supporting rod, of the central supporting block, a first threaded column is arranged at one end of the supporting rod, and the supporting rod is in threaded connection with the central supporting block through the threaded hole and the first threaded column.
  5. 5. The correction device of claim 4, wherein the bracket comprises eight struts, the vertices of the eight struts comprising a virtual cube structure; The side length of the center support block is not more than 10cm, and the side length of the virtual cube structure is 20-40 cm.
  6. 6. The correction device according to claim 1 or 2, characterized in that the point source housing comprises a housing groove for placing the point source and a sealing head for sealing the point source in the housing groove.
  7. 7. The correction apparatus according to claim 6, wherein the accommodation groove has a groove body, an inlet portion connected to an open end of the groove body, and a screw portion provided at an end of the inlet portion remote from the groove body, the inlet portion and the screw portion being cylindrical, the sealing head being provided with a second screw column capable of being connected to the screw portion and sealing the inlet portion and the groove body; Optionally, the lateral dimension of the inside of the open end is equal to or greater than the maximum lateral dimension of the outside contour of the point source and within 2mm of each other; Optionally, the sum of the longitudinal dimension of the inner side of the tank body and the longitudinal dimension of the inner side of the inlet portion is equal to or greater than the maximum longitudinal dimension of the point source outer profile, and the difference in dimension is within 2 mm; optionally, the point source is a sphere, and the inner side of the groove body is a cylinder or is provided with an arc surface; Optionally, the side surface of the sealing head is provided with an embossing pattern.
  8. 8. Correction device according to claim 1 or 2, characterized in that the support is made of a material having low absorption characteristics for gamma rays and X-rays; optionally, the bracket is made of acrylic and/or carbon fiber.
  9. 9. Correction device according to claim 1 or 2, characterized in that the radioactive source solution is a Tc-99m radioactive source solution or an F-18 radioactive source solution.

Description

Correction device for registration accuracy of multi-modality imaging system Technical Field The application relates to the field of medical instruments, in particular to a correction device for registration accuracy of a multi-mode imaging system. Background The multi-mode imaging technology is to use different imaging technologies to carry out multi-dimensional and three-dimensional imaging on the same patient so as to obtain more comprehensive and accurate medical image information. Common multi-modality imaging techniques include PET-CT, SPECT-CT, and the like. In PET-CT and SPECT-CT techniques, CT provides anatomical imaging and PET/SPECT provides functional imaging, and the CT image can be used for positioning a specific position of the PET/SPECT image in a human body and also for performing attenuation correction on the PET/SPECT image. The fusion technology can exert the advantages of two imaging inspection technologies and make up the respective defects, so that the information quantity obtained on the image is greatly improved, the sensitivity, the specificity and the accuracy of disease diagnosis are improved, the early diagnosis and the judgment of curative effect on the disease can be realized, and the effect of 1+1>2 is realized. When PET-CT and SPECT-CT work, the CT image and the PET/SPECT image need to be fused into one image accurately, so that accurate positioning and attenuation correction of focus positions are realized. In order to ensure the accuracy, stability and consistency of the equipment in the production, manufacture and use processes and the accuracy of image fusion, the registration accuracy correction of the equipment is required to be carried out regularly. Registration accuracy correction for PET-CT, SPECT-CT is required here using correction models. In the prior art, correction models are mainly prepared by mixing a Tc-99m solution with a high-density CT contrast medium in a certain proportion, and then injecting the mixed solution into a plurality of containers. The solutions distributed in each container need to be equal in volume, equal in density and equal in radioactivity. Currently, the container for containing the mixed solution is generally in a cylindrical tube shape or in an inverted cone shape with a wide upper part and a narrow lower part, such as CN103584878A, CN104665857a. However, these schemes have the following drawbacks in practical operation: 1. When the mixed solution is injected into the container, it is difficult to ensure that the injection amount of each container is consistent, so that the activity of the radioactive source of each point source is inconsistent, and the identification of each point source in the correction process is deviated, the side wall of the container is easy to be stained with the radioactive source in the injection process, so that the radioactive source is not distributed as a spherical point source, the identification of each point source in the correction process is deviated, air bubbles are easy to appear in the injection process, and the positioning is inaccurate due to the existence of the air bubbles. 2. The container is in a cylindrical tube shape or in an inverted cone shape with a wide upper part and a narrow lower part, when PET/SPECT and CT are scanned by 360 degrees, the data collected in all directions have different directions due to uneven distribution of the radioactive sources, so that the radioactive sources are positioned inaccurately, and the central coordinates of the radioactive sources cannot be determined. 3. The radioactive source is liquid, so that the radioactive source is easy to leak in the injection process, radioactive pollution is caused to the environment, personnel and equipment, unsafe exists, and the radioactive source in the model can shake in the moving process or the scanning equipment collecting process, so that the side wall of the container is stained with the radioactive source, and the leakage risk is increased when the radioactive source is positioned inaccurately. 4. Because the mixed solution has certain requirements on the proportion of the radioactive source and the contrast agent, the proportion of the contrast agent and the radioactive source needs to be strictly controlled, when the proportion is inaccurate, the PET/SPECT image and the CT image can be unclear, and the accuracy of registration correction is affected, however, in the actual operation process, the proportion is strictly controlled with great difficulty because the decay time of the radioactive source is relatively short. The matters in the background section are only those known to the inventors and do not, of course, represent prior art in the field. Disclosure of utility model To solve at least one of the above technical problems, the present application provides a correction apparatus for registration accuracy of a multi-modality imaging system, including: the bracket comprises at least four supporting rod