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Collimator calibration method, device, CT system and storage medium

A correction method and collimator technology, applied in the field of medical instruments, can solve problems such as inaccurate width, affecting CT image imaging quality, mechanical errors, etc., and achieve the effect of improving imaging quality

Active Publication Date: 2022-04-15
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to certain mechanical errors in the installation process of the ball tube 110, the collimator 120 and the detector array 130, when the CT system is used for scanning imaging, due to the set position of the collimator 120 and the first blade, The width of the collimation slit formed by the second blade is inaccurate, which affects the imaging quality of CT images

Method used

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  • Collimator calibration method, device, CT system and storage medium
  • Collimator calibration method, device, CT system and storage medium
  • Collimator calibration method, device, CT system and storage medium

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Embodiment 1

[0027] Figure 1B It is a flowchart of a collimator calibration method in Embodiment 1 of the present invention. The present invention is applicable to Figure 1A Shown is the case where mechanical errors in the CT system are compensated. The method is executed by a collimator calibration device, which is realized by software and / or hardware and configured in a CT system. Among them, see Figure 1A , the CT system includes a tube 110, a collimator 120 and a detector array 130, wherein the collimator 120 includes a first leaf and a second leaf, and the first leaf and the second leaf are along the same reference axis move.

[0028] like Figure 1B A collimator correction method shown includes:

[0029] S110. Respectively acquire current code values ​​corresponding to when the first vane and the second vane move to a target closing point.

[0030] see Figure 1A , wherein the target closure point O is the intersection of the reference axis and the line connecting the focal p...

Embodiment 2

[0045] figure 2 It is a flow chart of a collimator calibration method in Embodiment 2 of the present invention. The embodiment of the present invention performs additional optimization on the basis of the technical solutions of the foregoing embodiments.

[0046] Further, before the operation "respectively obtain the current code values ​​corresponding to when the first blade and the second blade move to the target closing point", add "acquire scan data and determine the number of acceptable rays according to the scan data". Target detector array; according to the positional relationship between the tube, the first blade, the second blade and the target detector array, respectively determine the distance between the first blade and the target closing point and the second distance between the second blade and the target closing point; according to the first distance and the second distance, respectively control the first blade and the second blade move to the target closing ...

Embodiment 3

[0067] Figure 3A It is a flowchart of a collimator calibration method in Embodiment 3 of the present invention. The embodiments of the present invention provide a preferred implementation manner based on the technical solutions of the foregoing embodiments.

[0068] like Figure 3A A collimator correction method shown includes:

[0069] S301. Scan the air medium to obtain current scanning data, and determine the radiation intensity of each detector according to the current scanning data.

[0070] S302. Determine that the detectors whose ray intensity is not less than a set threshold are target detector arrays.

[0071] Wherein, the threshold is set as the radiation intensity corresponding to the scanning data obtained by collecting the air medium when the tube does not emit radiation. see Figure 3B The radiation intensity diagrams corresponding to each row of detectors are shown. Among them, the abscissa is the number of detector rows, the ordinate is the ray intensity...

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Abstract

Embodiments of the present invention disclose a collimator calibration method, device, CT system and storage medium. The method includes: respectively acquiring current codes corresponding to the first blade and the second blade when they move to a target closing point value; wherein, the target closing point is the intersection of the line connecting the focus of the tube and the target point of the detector array and the reference axis; the first blade and the second blade in the collimator move along the reference axis; respectively; A correction value is determined according to the difference between the current code value of the first blade, the second blade and the corresponding preset code value, so as to correct the collimator position according to the correction value. The adoption of the above technical solution enables to compensate the mechanical error caused by the installation process of the tube, the collimator and the detector array when the CT system is used for scanning, thereby improving the imaging quality of the CT image.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of medical instruments, and in particular to a collimator calibration method, device, CT system, and storage medium. Background technique [0002] Clinically used computerized tomography (Computed Tomography, CT) imaging is based on the different degrees of attenuation of X-rays by different tissues or organs of the human body, and using X-rays to irradiate the human body to obtain images after X-rays have been attenuated by various tissues of the human body, and use Images are used as a reference for disease diagnosis. [0003] see Figure 1A , in the CT imaging process, in order to reduce the interference of scattered rays, reduce the patient's radiation dose, and improve the imaging quality of CT images, a collimator 120 is usually arranged between the tube 110 and the detector array 130 to Collimates the X-rays emitted by the tube. Wherein, the collimator 120 includes a first leaf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03
Inventor 李兵
Owner SHANGHAI UNITED IMAGING HEALTHCARE