CN-121987232-A - Medical imaging device, collimator and processing method thereof

CN121987232ACN 121987232 ACN121987232 ACN 121987232ACN-121987232-A

Abstract

The application relates to medical imaging equipment, a collimator and a processing method thereof. Because the adjacent two rows of collimating holes of the collimating body are arranged in a staggered way, if the cross splicing method in the prior art is adopted, the splice is formed in the collimating holes, so that part of the collimating holes is blocked by the splice, or the splice is formed between the two collimating holes, and the thickness of a partition plate between the two collimating holes is increased, so that gamma photons of which part can enter the collimating holes are blocked, the sensitivity of the part is reduced, and the uniformity of the collimator is further influenced. In the collimator formed by splicing the spliced edges of the collimating bodies, the splice is positioned in the collimating holes, and although the splice is formed in the collimating holes, the equivalent aperture of the collimating holes at the splice is unchanged, namely the effective aperture is unchanged, so that the gamma photons entering the collimating holes are consistent in count, thereby ensuring the uniformity of the collimator and further ensuring the image quality.

Inventors

TANG SONGSONG
Wang Beien
LIU ZHONGZHI
DONG JUN
SUN YOUJUN

Assignees

上海联影医疗科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (10)

1. A method for processing a collimator, the method comprising: Acquiring a plurality of collimating bodies (110), wherein an included angle between a first splicing edge (112) and a second splicing edge (113) of each collimating body (110) is an acute angle or an obtuse angle, each collimating body (110) is provided with a plurality of rows of collimating holes (111), and every two adjacent rows of collimating holes (111) are arranged in a staggered manner; Dividing a plurality of collimating bodies (110) into two groups, and splicing first splicing edges (112) of the two collimating bodies (110) of the same group to form a collimating module with a first splice (120); And splicing the second splicing edges (113) of two adjacent collimating modules to form a collimator with a second splicing seam (130), wherein the first splicing seam (120) and the second splicing seam (130) are respectively positioned in the collimating holes (111) at corresponding positions, and the equivalent aperture of the collimating holes (111) of the splicing seam area is equal to the aperture of the collimating holes (111) of the non-splicing seam area.
2. The method of processing a collimator of claim 1, wherein the step of obtaining a plurality of collimating bodies (110) includes determining a cross-sectional area of the collimating aperture (111) of the split area based on a cross-sectional area of the collimating aperture (111) of the non-split area.
3. A method of processing a collimator according to claim 1, characterized in that the side length of the collimating aperture (111) of a patchwork area is larger than the side length of the collimating aperture (111) of a non-patchwork area.
4. The method of processing a collimator according to claim 1, wherein the first and second slits (120, 130) divide the collimating aperture (111) at the corresponding position in two equal parts, respectively.
5. The method of processing a collimator according to claim 1, characterized in that along a hole depth direction of the collimating aperture (111), at least part of an extending direction of the first joint (120) intersects the hole depth direction; Along the hole depth direction of the collimation hole (111), at least part of the extending direction of the second splice joint (130) is intersected with the hole depth direction.
6. The method according to claim 5, wherein at least one of the first and second slits (120, 130) is of a diagonal type or at least one of the first and second slits (120, 130) is of a stepped type along a hole depth direction of the collimating hole (111).
7. The method of processing a collimator according to claim 1, wherein the step of obtaining a plurality of collimator bodies (110) comprises: establishing a 3D model of the collimator (110); and sintering and forming the collimating body (110) by utilizing a selective laser sintering method according to the 3D model of the collimating body (110).
8. The method of processing a collimator according to claim 7, wherein the step of sintering the collimator body (110) by a selective laser sintering method according to a 3D model of the collimator body (110) includes: Depositing a fusible powder onto a forming plate; Controlling the motion trail of the laser beam according to the data of the 3D model, and scanning and melting the meltable powder; and adjusting the intensity of the laser beam to sinter and then solidify the fusible powder within the preset layer height range.
9. A collimator manufactured by the method of any one of claims 1 to 8.
10. A medical imaging device comprising a detector and a collimator according to claim 9.

Description

Medical imaging device, collimator and processing method thereof Technical Field The application relates to the technical field of medical imaging, in particular to medical imaging equipment, a collimator and a processing method thereof. Background SPECT (Single Photon Emission Computed Tomography ) is a nuclear medicine imaging technique used to generate three-dimensional images of radioisotope distribution in the body. SPECT techniques combine radioisotope labeled tracers, gamma cameras (GAMMA CAMERA), and computer image processing techniques for diagnosis and monitoring of a variety of diseases. The role of the collimator in SPECT is to let each scintillator pixel receive gamma photons of the corresponding region and to block gamma photons outside the field of view from entering this scintillator pixel. The processing precision of the collimator has great influence on the imaging performance of the system, and directly determines the quality of the finally obtained image. It is difficult to manufacture a collimator of a larger size at a time, so that a segmented processing is generally adopted, and then the segmented collimators are spliced. In the related art, the seams among the segmented collimators are uneven, so that the uniformity of the collimators is influenced, and the image quality is influenced. Disclosure of Invention Accordingly, it is necessary to provide a method for processing a collimator, which solves the problem that the uniformity of the collimator is affected in the conventional collimator processing method. A method of processing a collimator, the method of processing a collimator comprising: Acquiring a plurality of collimating bodies, wherein the included angle between the first splicing edge and the second splicing edge of each collimating body is an acute angle or an obtuse angle, each collimating body is provided with a plurality of rows of collimating holes, and every two adjacent rows of collimating holes are arranged in a staggered manner; dividing a plurality of collimating bodies into two groups, and splicing the first splicing edges of the two collimating bodies in the same group to form a collimating module with a first splicing seam; And splicing the second splicing edges of the two adjacent collimating modules to form a collimator with a second splicing seam, wherein the first splicing seam and the second splicing seam are respectively positioned in the collimating holes at corresponding positions, and the equivalent aperture of the collimating holes in the splicing seam area is equal to the aperture of the collimating holes in the non-splicing seam area. In one embodiment, the step of obtaining a plurality of collimating bodies includes determining a cross-sectional area of the collimating aperture of the split area based on a cross-sectional area of the collimating aperture of the non-split area. In one embodiment, the side length of the collimating aperture of the seam region is greater than the side length of the collimating aperture of the non-seam region. In one embodiment, the first and second seams respectively divide the collimating aperture at the corresponding position into two equal parts. In one embodiment, along the hole depth direction of the collimation hole, at least part of the extending direction of the first splice joint is intersected with the hole depth direction; And along the hole depth direction of the collimation hole, at least part of the extending direction of the second splice joint is intersected with the hole depth direction. In one embodiment, at least one of the first and second seams is diagonal or at least one of the first and second seams is stepped along the depth direction of the collimation hole. In one embodiment, the step of obtaining a plurality of collimating bodies includes: Establishing a 3D model of the collimating body; And sintering and forming the collimation body by using a selective laser sintering method according to the 3D model of the collimation body. In one embodiment, the step of sintering the collimating body using a selective laser sintering method according to a 3D model of the collimating body comprises: Depositing a fusible powder onto a forming plate; Controlling the motion trail of the laser beam according to the data of the 3D model, and scanning and melting the meltable powder; and adjusting the intensity of the laser beam to sinter and then solidify the fusible powder within the preset layer height range. The collimator is manufactured by adopting the method for manufacturing the collimator. A medical imaging device comprising a detector and a collimator as described above. According to the processing method of the collimator, since the adjacent two rows of the collimating holes of the collimator body are arranged in a staggered manner, if the cross splicing method in the prior art is adopted, the splice is formed in the collimating holes, so that part of the collimating holes is blocked by the splice,