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A kind of ct detector gap_size calibration plate and its calibration method, calibration assembly

A detector and calibration board technology, which is applied in the fields of radiological diagnosis instruments, medical science, diagnosis, etc.

Active Publication Date: 2022-05-27
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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  • A kind of ct detector gap_size calibration plate and its calibration method, calibration assembly
  • A kind of ct detector gap_size calibration plate and its calibration method, calibration assembly
  • A kind of ct detector gap_size calibration plate and its calibration method, calibration assembly

Examples

Experimental program
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Embodiment 1

[0032] The CT detector Gap_Size calibration board of this embodiment is applied to the Gap_Size calibration of the detector modules of 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] like figure 1 As shown, the calibration plate includes a plate body 1, and the plate body 1 has an array of gaps 10 distributed along its length direction, and the projection area of ​​each gap to the CT detector covers three columns of detector modules; the left side of the gap 10 is along the Z axis. The slanted surface structure extending in the Z direction makes the projection of the gap to a corresponding column of detector modules from completely covering to completely not covering the corresponding scintillation crystal plates; the right side of the gap 10 i...

Embodiment 2

[0048] The difference between the CT detector Gap_Size calibration method of this embodiment and Embodiment 1 is:

[0049] no need to base Fitting to obtain I=F(S), which can be directly based on the X-ray absorption I of each scintillation crystal plate i and the theoretical area S i The fitting obtains I=F(S), and the fitting accuracy is relatively reduced, which can meet the needs of different applications.

[0050] Correspondingly, the step (1) of “collecting the X-ray absorption amount I of each scintillation crystal slice of the detector module in the same column in the CT detector” can be omitted. i , and obtain the completely uncovered area of ​​each scintillation crystal slice as S 0 ", other steps can refer to embodiment 1;

[0051] The corresponding calibration plate and calibration assembly can refer to Example 1.

Embodiment 3

[0053] The difference between the CT detector Gap_Size calibration method of this embodiment and Embodiment 1 is:

[0054] The actual Gap_Size of the CT detector 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 Gap_Size of the CT detector.

[0055] For other steps, refer to Example 1;

[0056] The corresponding calibration plate and calibration assembly can refer to Example 1.

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Abstract

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. Wherein, the CT detector Gap_Size calibration board, the CT detector includes multiple columns of detector modules arranged along the X direction, each column of detector modules includes several scintillation crystal sheets arranged along the Z direction, and the calibration board includes The plate body has an array of gaps distributed along its length direction, and the projection area from each gap to the CT detector covers at least two columns of detector modules; the first side of the gap is a slope structure extending along the Z direction, so that The projection of the slit to the corresponding row of detector modules ranges from completely covering to not covering the corresponding scintillation crystal sheet at all. The present invention does not require the rotation of the CT scanning frame, and completely eliminates the influence of focus drift and mechanical deformation of the frame and the detector; it also does not need to perform nonlinear optimization solution, and there is no problem of difficult solution.

Description

technical field [0001] The invention belongs to the technical field of CT, and in particular relates to a Gap_Size calibration plate of a CT detector, 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 tomographic images 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 geometrical optical size is consistent with the theoretical geometrical optical size. The geometrical optical size involves many geometric parameters. Among them, the X-direction position of the detector scintillator, especially the X-direction position. The size of the air gap (Gap_Size) between adjacent detector modules is the most sensitive to the influence of detector imaging, and cannot be self-calibrated, so it needs to be guarante...

Claims

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Application Information

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Patent Type & Authority Patents(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