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Weighting Method of Projection Data in CT Imaging

A technology of projection data and functions, applied in image data processing, projection reproduction, image generation, etc., can solve problems such as being unsuitable for 3D reconstruction, and the cone angle increase has no correspondence.

Active Publication Date: 2017-03-01
TOSHIBA MEDICAL SYST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing research does not correspond to the increase of the cone angle and is not suitable for 3D reconstruction

Method used

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  • Weighting Method of Projection Data in CT Imaging
  • Weighting Method of Projection Data in CT Imaging
  • Weighting Method of Projection Data in CT Imaging

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0028] Below, while referring to the attached Figure 1 A method of weighting projection data of the X-ray computed tomography apparatus according to the present embodiment will be described. figure 1 It is a figure showing the structure of the X-ray computed tomography apparatus concerning this embodiment. An X-ray computed tomography apparatus (also referred to as a projection data measurement system) according to this embodiment includes a gantry 1 . The gantry 1 includes an X-ray source 3 and a two-dimensional array X-ray detector 5 . The X-ray source 3 and the two-dimensional array type X-ray detector 5 are mounted on the rotary ring 2 so as to face each other across the subject. The subject is placed on the movable top of the bed 6 . The rotary ring 2 rotates while the bed 6 moves along the rotary axis at a predetermined speed. The platform / bed controller 9 synchronously controls the rotation of the rotating ring 2 and the sliding movement of the bed 6 . Projection ...

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Abstract

The purpose is to improve the effect of weighting the projection data of the CT imaging system. The projection data weighting method of an embodiment collects projection data along a circular orbit using a cone beam. The projection data are appended with weights determined according to the weighting function wEGR(β,γ) normalized according to the function uEGR(φ(β)) for ECG synchronous reconstruction (ECG) was obtained. uEGR(φ(β)) is normalized by the sum of uEGR(φ(βcn)) in the range of n=-NPI to n=NPI (PI=π). φ represents the heartbeat phase, β represents the viewing angle, βcn represents the relative viewing angle, and γ represents the fan angle of the cone beam.

Description

technical field [0001] Embodiments of the present invention relate to projection data weighting methods for CT imaging systems. Background technique [0002] The reconstruction algorithm increases in importance as the number of detector columns increases and the cone angle increases. Conventionally, a motion-invariant FBP type (Katsevich algorithm: Katsevich algorithm) helical cone beam algorithm has been used. In its algorithm, only PI (π: half-turn) size data is used in the spiral. That is, if N (N=1, 3, . . . ) is used as a number representing a half-turn of the spiral, only data within the N-PI window, that is, data of a certain first half-turn size is used. [0003] There are problems shown below in the weighting of the N-PI window. Since the measurement data outside the N-PI window is not used, the subject is exposed to unnecessary radiation. Furthermore, since the same weight is used for all the data within the N-PI window, the algorithm shows sensitivity to the b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03
CPCA61B6/032A61B6/4085A61B6/5205A61B6/5288G06T11/005G06T2211/412A61B6/027
Inventor A·扎米亚京江苏碧珊中西知
Owner TOSHIBA MEDICAL SYST CORP