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Systems and methods for correcting projected images

A technology of projected images and correction coefficients, applied in the field of computed tomography, which can solve problems such as discrepancies, erroneous medical diagnosis, changes in radiation dose, etc., to reduce costs, improve quality, and improve image quality.

Active Publication Date: 2022-05-31
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the gantry rotates, the radiation dose delivered to the subject may vary, which may cause inconsistencies between projected images
For example, fluctuations in the dose of the X-ray source will cause the actual gray value of the projected image to differ from its ideal gray value at various gantry angles
The imaging quality of the CT images of the subject reconstructed based on these projection images is poor, which may lead to wrong medical diagnosis or inaccurate positioning of subsequent treatment

Method used

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  • Systems and methods for correcting projected images

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Embodiment Construction

[0036] In the following detailed description, numerous specific details are set forth by way of example in order to provide insight into the related invention.

[0037] The terminology used herein is used to describe specific exemplary embodiments only, and is not intended to be limiting. unless

[0038] It should be understood that the terms "system", "module", "unit" and / or "subunit" used in the present invention are

[0039] Generally, "module", "unit" and / or "subunit" as used in the present invention refers to storage in hardware or firmware

[0040] Unless expressly indicated otherwise, it should be understood that when a unit, engine, module or subunit is "located on," "connected to,"

[0042] One aspect of the present invention relates to a system and method for correcting at least two projected images of a subject. said to

[0043] FIG. 1 is a schematic diagram of an exemplary CT system 100 shown in accordance with some embodiments of the present invention. In some embod...

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Abstract

A method for correcting projection images, comprising: acquiring at least two projection images of an object under inspection, the at least two projection images are generated from scan data acquired by a CT scanner at at least two gantry angles, each projection The image corresponds to a rack angle. The method further includes correcting a first projection image of the at least two projection images according to a process for generating a corrected projection image. The process of generating a corrected projection image includes performing a first correction on the first projection image to generate a preliminary corrected first projection image based on the first projection image and a second projection image of the at least two projection images. projecting an image; and based on at least a portion of the preliminary corrected first projected image, performing a second correction on the preliminary corrected first projected image to generate a corrected first projected image corresponding to a first gantry angle.

Description

System and method for correcting projected images [0001] Priority Statement This application requires the PCT application that the application number submitted on November 8, 2017 is PCT / CN2017 / 110032 and Priority of PCT Application No. PCT / CN2018 / 087884, filed on May 22, 2018, the contents of which are cited in The way is included here. technical field [0003] The present invention relates to computed tomography (CT) techniques, and more particularly, to correcting projections in CT image reconstruction Image system and method. Background technique [0004] In recent years, CT technology has been widely used in clinical examination and medical diagnosis. During a CT scan, X-rays The imaging source and detector can be rotated around the subject with the gantry to scan the subject at multiple gantry angles. based on Scanning the data, multiple projection images corresponding to the corners of the gantry can be generated. However, when the gantry rotates, deliver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03A61B6/02A61B6/00G06T5/00
CPCA61B6/022A61B6/032A61B6/035A61B6/5264G06T2207/20068G06T2207/10081G06T5/00G06T11/005G06T2211/424G06T11/008
Inventor 杨宏成朱建伟孙海宁J·墨子
Owner SHANGHAI UNITED IMAGING HEALTHCARE