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Calibration method and device for CT image as well as CT system

A CT image and calibration method technology, which is applied in image enhancement, image analysis, and measurement devices, can solve the problems of low accuracy and insufficient timeliness of post-calibration technology calibration of CT images, so as to improve reliability and improve image calibration Effect, the effect of saving maintenance cost

Active Publication Date: 2014-10-08
TSINGHUA UNIV +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The present invention provides a method and device for calibrating CT images and a CT system to solve the technical problems of insufficient timeliness and low accuracy in post-calibration technology of CT images in the prior art

Method used

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  • Calibration method and device for CT image as well as CT system
  • Calibration method and device for CT image as well as CT system
  • Calibration method and device for CT image as well as CT system

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Embodiment Construction

[0057] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0058] Embodiments of the present invention firstly provide a calibration method for CT images, see figure 1 ,include:

[0059] Step 101: setting a fixed calibration piece outside the channel area of ​​the CT scanning device and within its maximum reconstruction area, and storing the theoretical value of the fixed calibration piece;

[0060] Ste...

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Abstract

The invention provides a calibration method and device for a CT image as well as a CT system. The method comprises steps as follows: arranging fixed type calibration pieces outside a channel area of a CT scanning device and inside a largest reconstruction area and storing theoretical values of the fixed type calibration pieces; collecting projection data of the fixed type calibration pieces and obtaining actual reconstruction images of the fixed type calibration pieces; and comparing the actual reconstruction images with the corresponding stored theoretical values and establishing a mapping function that calibrates the actual reconstruction images into theoretical values. According to the calibration method and device for the CT image as well as the CT system, the calibration quality can be effectively improved, the image calibration effect is enhanced, the reliability of the CT scanning device is improved, the maintenance cost is saved, and a high actual application value is obtained.

Description

technical field [0001] The invention relates to the technical field of radiation imaging detection, in particular to a calibration method and device for CT images and a CT system. Background technique [0002] CT technology has played an important role in security inspections and other occasions because it can eliminate the influence of overlapping objects. The traditional CT uses a slip ring device to obtain projection data at different angles through the rotation of the X light source and the detector, and obtains the tomographic image through the reconstruction method to obtain the internal information of the detected luggage item. Multi-energy spectrum analysis refers to the use of the difference in the X-ray absorption properties of a certain material for different energies to distinguish the material. Combined with CT technology and multi-energy spectrum analysis technology, the current luggage inspection equipment can reconstruct the atomic number and electron densit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
CPCA61B6/032A61B6/583A61B6/5205G01N23/04G01V5/224G01V5/226G01N23/046G06T11/003G06T2207/10081
Inventor 张丽金鑫黄清萍孙运达
Owner TSINGHUA UNIV
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