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X-ray computed tomography apparatus

An X-ray and X-ray tube technology, which is applied in the field of X-ray computed tomography equipment, can solve the problem that the image quality cannot meet the requirements, etc.

Inactive Publication Date: 2008-07-30
GE MEDICAL SYST GLOBAL TECH CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the contrary, when the dose of X-ray is reduced, the problem will appear, and the image quality will not meet the requirements

Method used

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  • X-ray computed tomography apparatus
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  • X-ray computed tomography apparatus

Examples

Experimental program
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Effect test

no. 1 example

[0111] This is an embodiment in which images of tomographic images based on a plurality of X-ray tube voltages are fed back in order to adjust the image quality of each tomographic image subjected to dual-energy scanning to conform to an index value corresponding to the target image quality Refactor conditions, readjust.

no. 2 example

[0113] This is an embodiment in which multiple x-ray tube voltage based slices are adjusted in such a way that each tomographic image undergoing a dual energy scan is given an index value corresponding to the target image quality and that the index value meets the requirements Analyze image imaging conditions and image reconstruction conditions.

no. 3 example

[0115] This is an embodiment where when a misregistration artifact is found in each tomographic image subjected to the dual energy scan, a registration or alignment correction is performed so that the images of the tomographic images subjected to the dual energy scan Quality optimized to target image quality, i.e. index value.

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Abstract

The present invention provides an X-ray CT apparatus capable of improving image quality of a dual energy image. The X-ray CT apparatus comprises an X-ray tube for applying X rays having a first energy spectrum and X rays having a second energy spectrum different from the first energy spectrum to a subject, an X-ray data acquisition unit for acquiring X-ray projection data of the first energy spectrum projected onto the subject and X-ray projection data of the second energy spectrum projected thereonto, dual energy image reconstructing unit for image-reconstructing tomographic images indicative of X-ray tube voltage-dependent information at X-ray absorption coefficients related to a distribution of atoms, based on the X-ray projection data of the first energy spectrum and the X-ray projection data of the second energy spectrum, and adjusting unit for adjusting conditions for the image reconstruction in order to optimize the tomographic images indicative of the X-ray tube voltage-dependent information.

Description

technical field [0001] The present invention relates to the technology of an X-ray CT apparatus and an X-ray CT image reconstruction method used therefor, which optimizes the two-dimensional distribution of information related to X-ray tube voltage represented by X-ray absorption coefficients related to atomic distribution Spatial resolution and image noise of a tomographic image (ie, a tomographic image subjected to so-called dual-energy scanning in medical X-ray CT (Computed Tomography) equipment or the like). Background technique [0002] In an X-ray CT apparatus utilizing a two-dimensional X-ray surface detector, when obtaining a tomographic image of a two-dimensional distribution of given atoms, tomography based on low X-ray tube voltage and high X-ray tube voltage is performed, such as As shown in Fig. 4, tomographic images with low X-ray tube voltage and high X-ray tube voltage are thus obtained. Then, the low X-ray tube voltage tomographic image and the high X-ray t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/02
CPCA61B6/542A61B6/4035A61B6/405A61B6/027A61B6/583
Inventor 西出明彦乡野诚
Owner GE MEDICAL SYST GLOBAL TECH CO LLC
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