US 2002/0153491 A1Published application

X-ray flat panel detector

AssigneeKabushiki Kaisha Toshiba

InventorsYasuhiro Sugawara, Takayuki Tomisaki, Manabu Tanaka, Akira Tsukamoto

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Abstract

An X-ray flat panel detector includes sensor elements constituted by a plurality of effective pixels that detect X-rays and a plurality of dummy pixels that are arranged adjacent to the effective pixel area and generate electrical signals irrelevant to X-rays, signal lines which read out electrical signals from the respective pixels, scanning lines which scan the respective pixels, a first electrostatic wiring line which distributes static electricity accumulated in the signal lines, and a second electrostatic wiring line which distributes static electricity accumulated in the scanning lines. A plurality of dummy pixels are classified into a DA area where noise superposed on the signal lines are removed and a DB area where noise superposed on the scanning lines are removed. The first and second electrostatic wiring lines are laid out around the sensor elements, and physically disconnected between the DA area and the DB area.

Claims20

Dependent claims

An X-ray flat panel detector comprising:

an effective pixel array in which a plurality of pixel electrodes are arrayed in a matrix and accumulate charges;
a photoconductor which covers said effective pixel array and generates charges on the basis of incident X-rays;
a bias electrode which is formed on a second surface of said photoconductor, covers an area of said pixel electrodes, and applies a bias voltage between said photoconductor and said pixel electrodes;
a plurality of signal lines to read out electronic signals from said effective pixel array;
a plurality of scanning lines to scan said effective pixel array;
first dummy pixels which are arranged adjacent to said effective pixel array and remove noise superposed on said plurality of signal lines;
second dummy pixels which are arranged adjacent to said effective pixel array and remove noise superposed on said plurality of scanning lines;
a first protective electrode which is arranged in correspondence with said first dummy pixels and electrically shields said bias electrode and said plurality of signal lines or said plurality of scanning lines;
and
a second protective electrode which is arranged in correspondence with said second dummy pixels, disconnected from said first protective electrode and electrically shields said bias electrode and said plurality of signal lines or said plurality of scanning lines.

7 more elements

An X-ray flat panel detector comprising:

an effective pixel array in which a plurality of pixel electrodes are arrayed in a matrix and accumulate charges;
a photoconductor which covers said effective pixel array and generates charges on the basis of incident X-rays;
a plurality of first signal lines to read out electronic signals from said effective pixel array;
a plurality of first scanning lines to scan said effective pixel array;
and
an electrostatic dispersion wiring line which is connected directly or via a nonlinear element to at least one of said plurality of first signal lines and at least one of said plurality of first scanning lines, and distributes static electricity accumulated in at least one of said plurality of first signal lines or said plurality of first scanning lines,
wherein said electrostatic dispersion wiring line has a first auxiliary wiring line to disconnect said electrostatic dispersion wiring line between a connecting portion between said electrostatic dispersion wiring line and at least one of said plurality of first signal lines and a connecting portion between said electrostatic dispersion wiring line and at least one of said first scanning lines.

4 more elements

An X-ray flat panel detector comprising:

an effective pixel array in which a plurality of pixel electrodes are arrayed in a matrix and accumulate charges;
a photoconductor which covers said effective pixel array and generates charges on the basis of incident X-rays;
a plurality of first signal lines to read out electronic signals from said effective pixel array;
a plurality of first scanning lines to scan said effective pixel array;
an electrostatic dispersion wiring line which is connected directly or via a nonlinear element to at least one of said plurality of first signal lines and at least one of said plurality of first scanning lines, and distributes static electricity accumulated in at least one of said plurality of first signal lines or said plurality of first scanning lines;
first dummy pixels which remove noise superposed on said plurality of signal lines;
second dummy pixels which remove noise superposed on said plurality of scanning lines;
a plurality of second signal lines to read out electronic signals from said first dummy pixels;
and
second scanning lines to scan said second dummy pixels,
wherein said electrostatic dispersion wiring line has
a first wiring line which is connected to at least one of said plurality of first signal lines and at least one of said plurality of second signal lines,
a second wiring line which is connected to at least one of said plurality of first scanning lines, and
a third wiring line which is connected to at least one of said plurality of second scanning lines.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/127,758Filed 23 Apr 2002
Priority: JP 2001-12468223 Apr 2001
Published: 24 Oct 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G01T 1/2928
Static instruments for imaging the distribution of radioactivity in one or two dimensions; Radio-isotope cameras: using solid state detectors
H04N 25/671
Applied to fixed-pattern noise, e.g. non-uniformity of response: for non-uniformity detection or correction
H04N 25/673
For non-uniformity detection or correction: by using reference sources
G01T
Measurement of nuclear or x-radiation