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Method for calibrating and detecting CT detector module

A detector and CT scanning technology, applied in radiation intensity measurement, computerized tomography scanner, echo tomography, etc., can solve problems such as misalignment, and achieve the effect of preventing artifacts and avoiding position deviation

Inactive Publication Date: 2008-12-24
SIEMENS SHANGHAI MEDICAL EQUIP LTD
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Problems solved by technology

[0006] In the process of replacing the detector module, it is necessary to ensure that the position of the replaced detector module is completely aligned with other modules on the detector, otherwise the replaced detector module will cause misalignment with other detector modules, resulting in Form tail shadows (artefacts) on the final generated CT image

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  • Method for calibrating and detecting CT detector module
  • Method for calibrating and detecting CT detector module
  • Method for calibrating and detecting CT detector module

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] Multi-slice spiral CT is the most popular CT equipment at present. Compared with single-slice spiral CT, the biggest difference between multi-slice spiral CT is to increase the number of detector rows in the z-axis direction to achieve the purpose of multi-slice sampling. Single-slice helical CT has a row of detectors in the z-axis direction, while multi-slice helical CT is composed of multiple rows of detectors to form a detector array, so this type of CT is also called multi-row helical CT.

[0027] A multi-row detector consists of several detector modules with the same structure. Structurally, each detector module includes several rows and several channels. The number of rows of each detector module is the number of rows of the entire CT detector, and the sum of the number of channels of all detector modules is the number of channels of the entire CT dete...

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Abstract

The invention provides a method for carrying out the calibration detection of a CT detector module, comprising the following steps: (1) the CT detector respectively detects and records scanning signals before and after the movement of a CT collimator; (2) the differences of the scanning signals are normalized, and a measurement value of the CT detector module is obtained by averaging and filtering; (3) the measurement value of the CT detector module is compared with a threshold, if the measurement value is outside the range of the threshold, the position of the CT detector module is re-adjusted and the calibration detection is carried out again; if the measurement value is in the range of the threshold or equal to the threshold, the calibration of the CT detector module is in line with the requirements. The adoption of the method of the invention can detect whether the position of the detector module after the replacement is consistent with the positions of other detector modules or not, thereby avoiding the position deviation of the detector after the replacement and further preventing the occurrence of artifacts on an obtained CT image.

Description

technical field [0001] The invention relates to a computerized tomography (CT; Computerized Tomography) method, in particular to a method for calibrating and detecting detectors in CT equipment. Background technique [0002] A typical CT device mainly includes three parts, namely a scanning part, an examination bed, and an operation console. Among them, the CT scanning part is mainly composed of X-ray tubes, high-voltage generators, detectors, data acquisition systems, and control computers. The X-ray tube emits an X-ray beam to scan the selected layer, and the detector converts the collected X-ray signal into an electrical signal, which is converted into a digital signal by an analog / digital (A / D) converter, and input to the computer for storage and processing. Through processing, the CT value (CT Number) of each unit volume of the layer is obtained, and arranged into a digital matrix (Digital Matrix). The digital matrix is ​​converted into an image on the monitor through...

Claims

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Application Information

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IPC IPC(8): G01T1/16A61B6/03
Inventor 邵军明江淳
Owner SIEMENS SHANGHAI MEDICAL EQUIP LTD
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