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Radiation photography device

A photographic device, radiation technology, applied in the fields of radiological diagnostic equipment, medical science, diagnosis, etc., can solve problems such as insufficient research, and achieve the effect of excellent contrast

Inactive Publication Date: 2009-12-23
HITACHI MEDICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, other applications, especially attempts to increase image contrast, have not been sufficiently studied

Method used

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Experimental program
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Effect test

no. 1 Embodiment approach

[0057] figure 1 It is a diagram showing a preferred embodiment of the radiographic apparatus (hereinafter referred to as "X-ray CT apparatus") of the present invention. The X-ray CT apparatus 1 of the present invention includes a gantry 2 , and the gantry 2 has an X-ray source 3 , a collimator 4 and a detector array 5 located on the opposite surface of the gantry 2 . The detector array 5 is formed of detector elements 6 that detect X-rays transmitted through a subject on a pedestal (not shown). The detector elements 6 are arranged in a row shape, or a plurality of rows arranged side by side. Each detector element 6 generates an electrical signal indicating the intensity of the incident X-ray beam, that is, the attenuation of the X-ray beam when it passes through the subject. X-ray projection data can be acquired by rotating the gantry 2 around the rotation center 8 while the X-rays 7 are irradiated from the X-ray source 3 . The gantry 2 and the X-ray source 3 are controlled...

no. 2 Embodiment approach

[0076] Figure 5 This is the flow of processing from acquisition of projection data to display of composite images in the second embodiment of the X-ray CT apparatus of the present invention.

[0077] In step S501, first collect projection data (S501). The method for collecting data may be the same as that of the first embodiment.

[0078]In step S502, the reconstruction unit 14 generates a first reconstructed image and a second reconstructed image for the projection data of each energy spectrum (S502).

[0079] In step S503, the mixing ratio calculation unit 15 calculates the effective atomic number of the pixel or local area of ​​interest (S503). The mixing ratio calculation unit 15 segments the first reconstructed image and the second reconstructed image by tissues having the same biological function. In multi-energy CT, instead of obtaining the overall attenuation coefficient as in conventional CT, a pair of images representing the respective attenuations from contrast ...

no. 3 Embodiment approach

[0090] Figure 7 This is the processing flow from the acquisition of projection data to the display of the composite image in the third embodiment of the X-ray CT apparatus of the present invention.

[0091] In step S701, projection data is first acquired (S701). The method of data collection may be the same as that of the first embodiment and the second embodiment.

[0092] In step S702, the reconstruction unit 14 generates a first reconstructed image and a second reconstructed image for the projection data of each energy spectrum (S702).

[0093] In step S703, the mixing ratio calculation unit 15 calculates the local standard deviation of the pixel values ​​around the pixel of interest, or the local standard deviation of the local area (S703).

[0094] In step S704, the mixing ratio calculation unit 15 compares the local standard deviation (SD1) of the first reconstructed image generated from the projection data acquired by the first energy spectrum and the projection data...

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Abstract

The radiographic apparatus according to the present invention is characterized in that the image processing unit includes: an acquisition unit that acquires projection data of the first energy spectrum and projection data of the second energy spectrum; A first image of projection data of an energy spectrum is synthesized with a second image based on projection data of the second energy spectrum according to prescribed synthesis conditions to generate a composite image; and a display unit displays the generated composite image.

Description

technical field [0001] The present invention relates to a radiographic apparatus and an image processing program, and more particularly, to a technique useful for generating higher-resolution tomographic images from data acquired using a plurality of X-ray energies. [0002] This application is an application accompanying Japanese Patent Application No. 2005-145166 based on the Japanese Patent Law and a claim of Paris priority based on Japanese Patent Application No. 2005-232060, and is intended to enjoy Japanese Patent Application No. 2005-145166 and Japanese Patent Application No. 2005-232060 applications by reference are accepted for the benefit of Background technique [0003] Patent Document 1 discloses multi-energy CT (multienergy CT) that irradiates two types of X-rays having different energy spectra. When X-rays having a spectral width are transmitted through a subject, since most of the low-energy X-rays are absorbed, a so-called beam hardening effect in which the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03
CPCA61B6/4241A61B6/482
Inventor 后藤大雅宫崎靖广川浩一尾见康夫
Owner HITACHI MEDICAL CORP
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