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CT detector Gap_Size calibration plate and calibration method and calibration assembly thereof

A calibration method and detector technology, applied in the fields of radiological diagnosis instruments, medical science, diagnosis, etc., can solve problems such as inability to remove, numerical instability, and inability to solve

Active Publication Date: 2021-06-25
FMI MEDICAL SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the calibration process, the CT gantry needs to be rotated, which cannot remove the influence caused by the focus drift and the mechanical deformation of the gantry and the detector; in addition, it is also necessary to solve the nonlinear optimization problem, when the adjacent detector modules to be solved When the number of Gap_Size between is too large, it will cause numerical instability, and it is difficult to solve, or even impossible to find a solution

Method used

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  • CT detector Gap_Size calibration plate and calibration method and calibration assembly thereof
  • CT detector Gap_Size calibration plate and calibration method and calibration assembly thereof
  • CT detector Gap_Size calibration plate and calibration method and calibration assembly thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The CT detector Gap_Size calibration board of this embodiment is applied to Gap_Size calibration of detector modules in adjacent columns of the CT detector.

[0033] Specifically, the CT detector includes multiple columns of detector modules arranged along the X direction, and each column of channel detector modules includes several scintillation crystal slices arranged along the Z direction.

[0034] Such as figure 1 As shown, the calibration board includes a board body 1, and the board body 1 has arrayed gaps 10 distributed along its length direction, and the projection area of ​​each gap to the CT detector covers three rows of detector modules; the left side of the gap 10 is along the Z The slant structure extending in the direction, so that the projection of the gap to the corresponding row of detector modules turns from completely covering to completely covering the corresponding scintillation crystal sheets; the right side of the gap 10 is a planar structure exten...

Embodiment 2

[0048] The CT detector Gap_Size calibration method of this embodiment is different from Embodiment 1 in that:

[0049] no basis Fitting obtains I=F(S), which can be directly based on the X-ray absorption I of each scintillation crystal sheet i and theoretical area S i The fitting results in I=F(S), and the fitting accuracy is relatively reduced, which can meet the requirements of different application occasions.

[0050] Correspondingly, the step (1) of "collecting the X-ray absorption I of each scintillation crystal sheet of the same row of detector modules in the CT detector" can be omitted. i ”, and obtain the area of ​​each scintillation crystal piece that is not covered at all as S 0 ", other steps can refer to embodiment 1;

[0051] For the corresponding calibration board and calibration assembly, refer to Embodiment 1.

Embodiment 3

[0053] The CT detector Gap_Size calibration method of this embodiment is different from Embodiment 1 in that:

[0054] The actual CT detector Gap_Size is the average value of the actual Gap_Size of the CT detectors corresponding to the three columns of detector modules corresponding to the gap, which further improves the calibration accuracy of the CT detector Gap_Size.

[0055] Other steps can refer to embodiment 1;

[0056] For the corresponding calibration board and calibration assembly, refer to Embodiment 1.

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Abstract

The invention belongs to the technical field of CT, and particularly relates to a CT detector Gap_Size calibration plate and a calibration method and a calibration assembly thereof. According to the CT detector Gap_Size calibration plate, the CT detector comprises a plurality of rows of detector modules arranged in the X direction, each row of detector module comprises a plurality of scintillation crystal pieces arranged in the Z direction, the calibration plate comprises a plate body, the plate body is provided with array cracks distributed in the length direction of the plate body, and the projection area from each crack to the CT detector at least covers two rows of detector modules; the first side of each crack is of an inclined plane structure extending in the Z direction, so that the projection of the cracks to the corresponding column of detector modules is from completely covering to completely not covering the corresponding scintillation crystal sheets. The CT scanning frame does not need to rotate, and the influence caused by focus drift and mechanical deformation of the rack and the detector is completely removed; and non-linear optimization solution does not need to be carried out so that the problem of difficult solution does not exist.

Description

technical field [0001] The invention belongs to the technical field of CT, and in particular relates to a CT detector Gap_Size calibration board, a calibration method thereof, and a calibration assembly. Background technique [0002] Computed tomography (computed tomography, CT) is a device that uses X-ray rotation to irradiate the object to be measured, and then obtains a tomographic image of the object through computer processing. In CT scanning imaging, in order to obtain better image quality, it is necessary to ensure that the actual geometric optical size is consistent with the theoretical geometric optical size. The geometric optical size involves many geometric parameters. Among them, the X-direction position of the detector scintillator, especially the The size of the air gap (Gap_Size) between adjacent detector modules is the most sensitive to the imaging effect of the detector, and it cannot be self-calibrated, so it needs to be guaranteed by machining; however, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03
CPCA61B6/585A61B6/032
Inventor 王斌徐琴陈伟刘建宏
Owner FMI MEDICAL SYST CO LTD