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

A projection data and image reconstruction technology, which is 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: 2005-04-06
GE MEDICAL SYST GLOBAL TECH CO LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

[0018] 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. figure 1 A block diagram showing 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.

[0019] Such as figure 1 As shown, the 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 .

[0020] The X-ray detector 24 has a plurality of detection elements arranged in an array al...

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Abstract

Disclosed are a method for rebuilding image with good quality in the condition of no relative data and X-ray CT device which can do the image rebuilding. In the image signal channel space for collecting projected data based on spiral scanning, use the projected data of its mirror point A'to supplement the data point A without projected data, forming full scanning projected data, then in accordance with which to rebuild the image, use the projected data of multiple data points B,C adjacent for interpolation when there is no projected data.

Description

technical field [0001] 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, in particular to reconstruction based on partial scan (partialscan) projection data. A method for constructing an image, a method for evaluating the normality of projection data, and an X-ray CT apparatus for performing such image reconstruction or evaluation of projection data. Background technique [0002] 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 3-4, Fig. 2-3)). [0003] Because the data points in the image channel space are discrete, the correct relative data may not exist in the measured projection ...

Claims

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Application Information

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IPC IPC(8): A61B6/03G06T5/00
Inventor 晏雄伟乡野诚丁玮王学礼
Owner GE MEDICAL SYST GLOBAL TECH CO LLC
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