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Radiographic image detector and gain setting method for radiographic image detector

A technology for radiography and image detectors, which is applied in the fields of instruments for radiological diagnosis, image communication, applications, etc., and can solve problems such as complex image correction processing and so on.

Active Publication Date: 2012-08-15
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the second method will complicate the image correction process after A / D conversion

Method used

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  • Radiographic image detector and gain setting method for radiographic image detector
  • Radiographic image detector and gain setting method for radiographic image detector
  • Radiographic image detector and gain setting method for radiographic image detector

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Embodiment Construction

[0041] exist figure 1 Among them, an x-ray radiography system 10 is composed of an x-ray projector 11 and a radiography apparatus 12 . The x-ray projector 11 is composed of an x-ray source 13 , an x-ray source controller 14 for controlling the x-ray source 13 , and an activation switch 15 . The x-ray source 13 has an x-ray tube 13a for radiating x-rays and a collimator 13b for confining the radiation field of the x-rays from the x-ray tube 13a.

[0042] The x-ray tube 13b has: a cathode including a filament for emitting thermions; and an anode (target) against which thermions strike to radiate x-rays. The collimator 13b may eg be made of x-ray shielded lead plates put together in a double cross configuration to form a central aperture through which the x-rays pass. The lead plate is movable to change the size of the central aperture in order to confine the radiation field to an appropriate extent.

[0043] The x-ray source controller 14 includes: a high voltage generator fo...

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Abstract

In a radiography system, after a radiation dose, signal charges are accumulated in sensor pixels in an imaging area of a flat panel detector corresponding to the dosed amounts of radioactive rays on the pixels. The signal charges are read out from the pixels and converted into voltage signals representative of density levels of respective pixels of a radiographic image. Before reading the signal charges, a dose profile representative of distribution of the dosed amounts of radioactive rays is measured by leak currents from the pixels or bias currents through bias lines for applying a bias voltage to the pixels. Based on the contrast or difference between the maximum value and the minimum value in the dose profile, a gain of amplifiers for the voltage signals is determined such that the gain increases with decreasing contrast.

Description

technical field [0001] The present invention relates to a radiographic image detector and a gain setting method for the radiographic image detector. Background technique [0002] In the medical field, radiography systems for imaging with radioactive rays such as x-rays are known. The x-ray radiography system includes: an x-ray projector having an x-ray source for radiating x-rays; X-rays are then received, thereby acquiring radiographs or x-ray images representing information about the subject. As a radiographic apparatus, an x-ray image detector using a flat panel detector (FPD) instead of a conventional x-ray film or an imaging panel (IP) has recently been developed and used in practice, which is capable of outputting digital images of acquired x-ray images. data, as disclosed in JPA 2009-219538. [0003] As described in this prior art, the FPD includes: a detection panel having an imaging area in which a large number of pixels are arranged in a matrix to accumulate the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/00
CPCH04N5/361H04N5/3653H04N5/32H04N25/672H04N25/63H04N25/67H04N25/30
Inventor 近藤洁
Owner FUJIFILM CORP
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