CT (computed tomography) dose modulation method and device, CT scanning method and CT system

A technology of dose modulation and CT value, which is applied in the field of image processing, can solve problems such as positioning image inclusion, achieve the effects of improving accuracy, ensuring diagnostic image quality, and reducing radiation dose

Active Publication Date: 2018-04-20
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a CT dose modulation method, device, CT scanning method, and CT system, which solve the technical problem that the positioning image used in CT dose modulation in the prior art only contains two-dimensional distribution information of absorbed dose

Method used

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  • CT (computed tomography) dose modulation method and device, CT scanning method and CT system
  • CT (computed tomography) dose modulation method and device, CT scanning method and CT system
  • CT (computed tomography) dose modulation method and device, CT scanning method and CT system

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Embodiment 1

[0066] figure 1 It is a flow chart of the CT dose modulation method provided by Embodiment 1 of the present invention. The technical solution of this embodiment is applicable to the case of acquiring clinical CT diagnostic images through helical scanning of a CT machine. The method can be executed by the CT dose modulation device provided by the embodiment of the present invention, the device can be implemented in the form of software and / or hardware, and configured to be applied in a processor, the processor is usually set in a control device connected to the spiral CT equipment in the computer.

[0067] A tomographic image of a clinical CT is usually reconstructed from scanning data obtained by a CT machine scanning a target part of a subject under a preset dose rate. In order to reduce the dose of radiation received by the subject and improve the quality of the diagnostic image, usually a lower scanning dose rate is used to obtain the localization image of the target part...

Embodiment 2

[0087] image 3 It is a flow chart of the method for determining absorbed dose distribution information provided by Embodiment 2 of the present invention. The embodiment of the present invention optimizes the determination of the absorbed dose distribution information of the target site according to the tomographic images corresponding to multiple body layers in the above embodiments. Such as image 3 As shown, the steps of the method for determining the absorbed dose distribution information include:

[0088] S21. Obtain the weighted sum of CT values ​​of all pixels of the tomographic image corresponding to each body layer, and use the weighted sum of CT values ​​as the first absorbed dose corresponding to each body layer.

[0089] The absorbed dose distribution information in the z-axis direction usually refers to the absorbed dose relationship between different z-axis coordinate values. To obtain the absorbed dose relationship corresponding to the z-axis coordinate value,...

Embodiment 3

[0122] Figure 7 It is a flow chart of the method for determining absorbed dose distribution information provided by Embodiment 3 of the present invention. On the basis of the above-mentioned embodiments, an optimization is performed on determining the absorbed dose distribution information of the target site according to the tomographic images corresponding to multiple body layers. Such as Figure 7 As shown, the steps of the method for determining absorbed dose distribution information include:

[0123] S21. Acquire a first focus path of tomographic images corresponding to multiple volume layers, where first focus positions in the first focus path are distributed in a spiral shape.

[0124] When the CT machine obtains the scan data of the target part of the subject through spiral scanning, its focus trajectory is spiral, so each z-axis coordinate value in the focus trajectory corresponds to only one focus position, and, because the focus trajectory is a three-dimensional s...

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Abstract

An embodiment of the invention discloses a CT (computed tomography) dose modulation method and device, a CT scanning method and a CT system. The method includes the steps: acquiring sectional images corresponding to a plurality of body sections of a target portion of a patient to be examined; determining absorption dose distribution information of the target portion according to the sectional images corresponding to the body sections; determining dose modulation information for CT diagnostic scanning according to the absorption dose distribution information of the target portion. The sectionalimages corresponding to the body sections are formed by reconstructing scanning data acquired by spirally positioning and scanning the target portion of the patient to be examined. The method solvesthe problem that CT positioning images only comprise absorption dose two-dimensional distribution information in the prior art. The sectional images serve as positioning images for CT dose modulation.

Description

technical field [0001] Embodiments of the present invention relate to the field of image processing, and in particular to a CT dose modulation method and device, a CT scanning method, and a CT system. Background technique [0002] CT (Computed Tomography, referred to as CT), that is, the positioning image commonly used by computerized tomography is similar to the projection map of XR. Due to the compression of three-dimensional information into a two-dimensional plane, the three-dimensional information of the scanned object is lost, which in turn causes the organs to overlap. It is convenient for doctors to identify organs. [0003] In addition, the commonly used absorbed dose modulation technology in CT is to calculate the absorbed dose or contour width of the scanned object on each z-axis coordinate value according to the above-mentioned positioning image, and then obtain the absorbed dose or contour width according to the z-axis coordinate value The change of the X-ray a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03
CPCA61B6/032A61B6/4411A61B6/5211A61B6/54
Inventor 林阳阳
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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