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Image reconstruction device and image reconstruction method

An image reconstruction, pixel value technology, applied in image generation, image data processing, instruments, etc., can solve problems such as X-ray radiation hazards

Inactive Publication Date: 2014-03-05
HITACHI LTD
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Problems solved by technology

[0004] Although X-ray CT equipment is widely used in the medical field as a kind of image diagnosis, the radiation caused by X-rays is harmful.

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  • Image reconstruction device and image reconstruction method
  • Image reconstruction device and image reconstruction method
  • Image reconstruction device and image reconstruction method

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Embodiment Construction

[0025] The present invention is an image reconstruction device. Based on the difference between the calculated projection data and the metered projection data obtained by performing forward projection calculation on the reconstructed image, it performs successive approximate calculations to generate a successive approximate reconstructed image. The reconstructed image is The image reconstruction device reconstructed based on the metering projection data is characterized by comprising: an acquisition unit that acquires an image quality parameter valued by an operator; a weight calculation unit that calculates a weight coefficient based on the image quality parameter; and An iterative approximation calculation unit that performs an iterative approximation calculation based on a value obtained by weighted addition of the pixel value thus obtained and the pixel value obtained at the previous iteration using the weight coefficient.

[0026] Furthermore, the present invention is an i...

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Abstract

In order to provide an image reconstruction device with which images having the quality required by the operator can be produced when cross-sectional images are reconstructed using iterative approximation, the invention is an image reconstruction device that performs iterative approximation based on the difference between measured projection data and calculated projection data obtained by forward projection of a reconstructed image reconstructed on the basis of the measured projection data. The image reconstruction device is characterized in being provided with: an input unit where image quality parameters that the operator considers to be important are input; a weighting computation unit that computes weighting coefficients based on the image quality parameter; and an iterative approximation unit that performs iterative approximation based on values obtained from weighted addition of pixel values that are about to be determined using the weighting coefficient and pixel values that were determined in the previous iteration.

Description

technical field [0001] The present invention relates to an image reconstruction device and an image reconstruction method for reconstructing a cross-sectional image through successive approximation calculations based on metrological projection data acquired by an X-ray CT (Computed Tomography) device, and in particular to an image reconstruction method while maintaining the characteristics of the original image. Technology to improve picture quality. Background technique [0002] An X-ray CT apparatus is a device that reconstructs a cross-sectional image based on metrological projection data obtained from various angles obtained by irradiating X-rays from around a subject, and displays the cross-sectional image. Methods for reconstructing cross-sectional images based on metrological projection data are broadly classified into analytical methods and successive approximation methods. The analytical method is a method of analyzing and obtaining an image based on the projection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03
CPCG06T11/006G06T2211/412G06T2211/424
Inventor 高桥悠后藤大雅广川浩一
Owner HITACHI LTD
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