Radiographic apparatus and radiation detection signal processing method

A technology of radiation detection and radiography, applied in X-ray equipment, radiation measurement, X/γ/cosmic radiation measurement, etc., can solve problems such as residual images and FPD residual images

Inactive Publication Date: 2005-02-16
SHIMADZU SEISAKUSHO CO LTD
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  • Description
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Problems solved by technology

[0003] However, as a radiation detector for detecting such an image ( In the case of radiation detection equipment), the time delay of FPD may cause residual image
So unless the lagging part is completely removed, there is also the problem of residual images

Method used

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  • Radiographic apparatus and radiation detection signal processing method
  • Radiographic apparatus and radiation detection signal processing method
  • Radiographic apparatus and radiation detection signal processing method

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Embodiment Construction

[0086] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0087] figure 1 is a block diagram showing the general structure of the fluoroscopic apparatus according to the present invention.

[0088] Such as figure 1 As shown, the fluoroscopic apparatus includes an X-ray tube (radiation emitting device) 1 for emitting X-rays to a patient M; an FPD 2 (radiation detection device) for detecting X-rays transmitted through the patient M; an analog-to-digital converter 3 (signal sampling device), for digitizing the X-ray detection signal (radiation detection signal) acquired from FPD (flat-panel X-ray detector) 2 with predetermined sampling time interval Δt; Detection signal processor 4, with for creating an X-ray image based on the X-ray detection signal output from the digital-to-analog converter 3; and an image monitor 5 for displaying the X-ray image created by the detection signal processor 4. That is, the ap...

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Abstract

A subtraction image is obtained, by a subtraction process (DSA process), from a live image and a mask image. A lag-behind part included in each X-ray detection signal is considered due to an impulse response formed of exponential functions. The lag-behind part is removed from each X-ray detection signal by a recursive computation to obtain a corrected X-ray detection signal. The live image and mask image are obtained from such corrected detection signals.

Description

technical field [0001] The present invention relates to a radiographic apparatus for medical and industrial use and a radiation detection signal processing method for detecting radiation based on radiation extracted from the radiation detection apparatus at predetermined sampling intervals by a signal sampling apparatus when radiation is emitted from the radiation emitting apparatus. signal to obtain radiographic images. More particularly, the present invention relates to a technique for improving image quality that is sensitive to damage of DSA (subtraction processing) images due to time lags that occur in radiation detection equipment. Background technique [0002] Typically, one type of radiographic equipment is designed for digital subtraction angiography (DSA) to observe the condition of a patient's blood vessels. The apparatus is operable to perform radiographs of a predetermined portion of the patient prior to injection of the contrast medium, and then to perform rad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/00A61B6/00G06T1/00G06T5/20G06T5/50H04N5/325H05G1/00
CPCA61B6/487A61B6/504H04N5/325A61B6/481A61B6/00
Inventor 冈村升一藤井圭一足立晋平泽伸也吉牟田利典田边晃一浅井重哉西村晓弘
Owner SHIMADZU SEISAKUSHO CO LTD
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