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Radioactive-ray photographic apparatus and radioactive-ray detection signal processing method

一种放射线检测、放射线照相的技术，应用在X射线设备、辐射的测量、辐射强度测量等方向，能够解决不能避免伪像、不能获得X射线图像、时滞没有被消除等问题

Inactive Publication Date: 2005-02-16
SHIMADZU SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the only result obtained is that the above techniques cannot avoid artifacts caused by time lag, and cannot obtain satisfactory X-ray images
It has been confirmed that the time lag caused by the FPD is not eliminated

Method used

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  • Radioactive-ray photographic apparatus and radioactive-ray detection signal processing method
  • Radioactive-ray photographic apparatus and radioactive-ray detection signal processing method
  • Radioactive-ray photographic apparatus and radioactive-ray detection signal processing method

Examples

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no. 1 example

[0115] figure 1 The block diagram shown shows the overall structure of the fluoroscopy apparatus in the first embodiment of the present invention.

[0116] Such as figure 1 As shown, the fluoroscopy equipment includes: X-ray tube 1 (radiation emitting device) for emitting X-rays to the patient M; FPD2 (radiation detection device) for detecting X-rays transmitted through the patient M; analog-to-digital conversion A device 3 (signal sampling device) is used to digitize the X-ray detection signal (radiation detection signal) acquired from FPD2 (flat panel X-ray detector) with a predetermined sampling time interval Δt; The X-ray detection signal output by the analog-to-digital converter 3 creates an X-ray image; and an image monitor 5 for displaying the X-ray image created by the detection signal processor 4 . That is, the fluoroscopy apparatus is configured to acquire an X-ray image from the X-ray detection signal acquired from the FPD 2 through the analog-to-digital convert...

no. 2 example

[0183] A second embodiment of the present invention will be described below with reference to the drawings.

[0184] Figure 8 The shown flowchart shows the steps up to the impulse response determination of the X-ray detection signal processing method in the second embodiment. Apart from the special function of the impulse response determiner 12, the fluoroscopic device in the second embodiment is the same as the fluoroscopic device in the first embodiment. In the X-ray detection signal processing method in the second embodiment, the steps after determining the impulse response and the recursive calculation performed by the time lag canceller 11 are the same as those in the first embodiment, and will not be described here again.

[0185] Figure 8 Steps S2 to S8 in the flow chart of the second embodiment shown are related to Figure 4 Steps S2 to S8 in the flowchart of the first embodiment shown are the same.

[0186] [Step S1a] The operator predicts that the signal decays...

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Abstract

A radiographic apparatus removes lag-behind parts from radiation detection signals taken from an FPD as X rays are emitted from an X-ray tube, on an assumption that the lag-behind part included in each X-ray detection signal is due to an impulse response formed of a plurality of exponential functions with different attenuation time constants. When a single attenuation time constant and intensity are provisionally set, checking is made whether an attenuation to a noise level of X-ray detection signals occurs in an X-ray non-emission state following an X-ray emission state. When the set attenuation time constant and intensity are found appropriate (OK), the impulse response having the single exponential function is determined valid. Corrected radiation detection signals are obtained by removing the lag-behind parts using the impulse response determined.

Description

technical field [0001] The present invention relates to a radiographic apparatus for medical or industrial use and a radiation detection signal processing method for obtaining radiation from radiation detection signals acquired from the radiation detection apparatus at predetermined sampling intervals by a signal sampling apparatus when a radiation emitting apparatus emits radiation. image. In particular, the present invention relates to a technique for determining a time constant and an intensity of an exponential function constituting an impulse response of a radiation detection apparatus. Background technique [0002] In medical fluoroscopy equipment which is a typical example of radiography, a flat panel X-ray detector (hereinafter appropriately referred to as "FPD") has recently been used as an X-ray detection device for detecting the generation of X-rays emitted from an X-ray tube. X-ray transmission images of the patient. The FPD includes a large number of semicondu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/04A61B6/00G01T1/00G01T1/17G01T1/24G21K5/02
CPCY10S378/901A61B6/4441A61B6/4233A61B6/587G01T1/171A61B6/583A61B6/00
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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