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Motion layer decomposition calibration of x-ray ct imagers

An X-ray, motion technology used in radiological diagnostic testing/calibration, instruments for radiological diagnostics, material analysis using wave/particle radiation, etc. still valid etc.

Active Publication Date: 2015-02-04
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different changes in position can occur for each movement, which can lead to uncompensated image artifacts when imaging an object The machine does not accurately reconstruct the absorption coefficient
Air calibrations that correct for attenuation and intensity changes due to scanner elements may not still be valid from the time the air calibration is generated to the time the subject is imaged

Method used

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  • Motion layer decomposition calibration of x-ray ct imagers
  • Motion layer decomposition calibration of x-ray ct imagers
  • Motion layer decomposition calibration of x-ray ct imagers

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Experimental program
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Embodiment Construction

[0022] Referring to FIG. 1 , a typical flat panel X-ray computed tomography system includes a source 2 , a filter 4 , a shutter / collimator 6 , a detector 8 and an anti-scatter grating 10 . Source 2 is for example an X-ray tube anode emitting X-rays. The X-ray filter 4 includes a beam shaper or filter unit that filters X-rays. A shutter / collimator 6 limits the extent of the X-ray beam that passes through the object and strikes the detector. The source 2, filter 4, shutter / collimator 6 are typically positioned on one arm of the system or at the end of an arm of the system. However, other geometries such as rings are also contemplated. After passing through object 12 , the x-rays pass through anti-scatter grating 10 and are detected by x-ray detector 8 . The detector 8 and anti-scatter grating 10 are typically located on opposite sides of the source 2, filter 4, shutter / collimator 6, eg at the other end or another arm of the system. The collimator typically confines the cross...

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PUM

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Abstract

An x-ray computed tomography system (14) includes a gantry (15), a plurality of elements (18), and one or more processors (28). The gantry (15) moves to different orientations and generates x-ray data which includes image projection data at a plurality of the orientations. The plurality of elements (18) connect to the gantry and cause x-ray attenuation of the generated projection data. The one or more processors (28) are programmed to receive (60) the generated x-ray data and decompose (62) the received image projection data into indications of relative positions of the plurality of elements at different orientations of the gantry.

Description

technical field [0001] The following generally relates to X-ray computed tomography. It finds particular application in connection with, and is described with particular reference to, scanner calibration and image artifact compensation. However, it should be understood that the invention also applies to other use cases and is not necessarily limited to the applications described above. Background technique [0002] X-ray computed tomography systems such as cone beam computed tomography (CBCT), 3D rotational angiography, X-ray CT (XCT), interventional X-ray, C-arm transmit X-rays and detect all objects after passing through the object. X-rays are emitted to reconstruct the image. Air calibration or rotational gain calibration projection images are typically collected at each of the multiple gantry locations without the object and stored for uniformity correction for the corresponding location. The stored uniformity correction data for each gantry position is used in image ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/00G06T11/00A61B6/03
CPCA61B6/582A61B6/032A61B6/584A61B6/5205G06T11/005G06T2211/412A61B6/4035A61B6/42A61B6/4233A61B6/4441A61B6/58A61B6/583G01N23/046G21K1/025G21K1/04
Inventor J·布雷多诺E·S·汉西斯
Owner KONINKLJIJKE PHILIPS NV