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Image reconstruction, projection data evaluating method and X ray CT device

A technology of projection data and evaluation method, applied in image data processing, calculation, image enhancement, etc., can solve the problem of poor reconstructed image quality and achieve good quality results

Inactive Publication Date: 2007-07-04
GECHINA RES & DEV CENT
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In this case, although the relatively best data in the measured projection data is used, the quality of the reconstructed image is not good because it is not completely relative data

Method used

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  • Image reconstruction, projection data evaluating method and X ray CT device
  • Image reconstruction, projection data evaluating method and X ray CT device
  • Image reconstruction, projection data evaluating method and X ray CT device

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Embodiment Construction

[0019] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments. FIG. 1 shows a block diagram of an X-ray CT apparatus. This device is an example of an embodiment of the present invention. An example of an embodiment of the device of the present invention is shown through the structure of the device. An example of an embodiment related to the method of the present invention is shown through the operation of this device.

[0020] As shown in FIG. 1 , this device includes a scanning gantry (gantry) 2 , an imaging table (table) 4 , and an operation console (console) 6 . The scanning gantry 2 has an X-ray tube 20 . X-rays (not shown) emitted from the X-ray tube 20 are formed into a fan-shaped X-ray beam (fan beam) by a collimator 22 and irradiated to an X-ray detector 24 .

[0021] The X-ray detector 24 has a plurality of detection elements arranged in an array along t...

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Abstract

A method which can reconstruct good quality images even without corresponding data according portion projection data of scanning and X-ray CT devices which can process said images reconstruction. It replaces the data points A without actual measuring projection data by its mirror point A 'with actual measuring projection data in image channel space collecting part of scanning actual measuring projection data to forming complete scanning projection data, reconstructs images according complete scanning projection data; when the mirror point A 'has not actual measuring projection data, it makes use of the actual measuring projection data of its near several data points B,C to building in data.

Description

[0001] This application is a divisional case of the parent case (application number: 03164845.2). technical field [0002] The present invention relates to an image reconstruction method, a projection data (data) evaluation method, and an X-ray computed tomography [CT (Computed Tomography)] device, and in particular relates to projection data based on partial scan (partial san) A method of reconstructing an image, a method of evaluating normality of projection data, and an X-ray CT apparatus for performing such image reconstruction or evaluation of projection data. Background technique [0003] In an X-ray CT device, only half-scan (half scan) measured projection data is collected in the image channel (view-channel) space, and the relative data contained in the measured projection data is used to supplement the full scan (full scan) Insufficient parts, reconstruct the image. (For example, JP-A-4-84940 (page 34, Figures 2-3)). [0004] Because the data points in the image c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03G06T5/00G06T15/00
Inventor 晏雄伟乡野诚丁玮王学礼
Owner GECHINA RES & DEV CENT
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