Radiation detector

Patent metadata

Field	Value
Publication number	US-10564300-B2
Application number	US-201815905381-A
Country	US
Kind code	B2
Filing date	Feb 26, 2018
Priority date	Jul 11, 2017
Publication date	Feb 18, 2020
Grant date	Feb 18, 2020

Abstract

A radiation detector includes a substrate, control lines provided on the substrate and extending in a first direction, data lines provided on the substrate and extending in a second direction crossing the first direction, and detection parts arranged in a matrix. Each detection part includes a thin film transistor and a conversion part converting radiation or light into electricity. Further, a control circuit switches an on state and an off state of each thin film transistor and a signal detection circuit reads out image data in the on state of the thin film transistor. Further, the detector judges a start time of radiation incidence based on a value of the image data read out in the on state of each thin film transistor.

First claim

What is claimed is:

1. A radiation detector, comprising:
a substrate;
a plurality of control lines provided on the substrate and extending in a first direction;
a plurality of data lines provided on the substrate and extending in a second direction crossing the first direction;
a plurality of detection parts arranged in a matrix, each of the plurality of detection parts including a thin film transistor and a conversion part, the thin film transistor electrically connected to one of the plurality of control lines and one of the plurality of data lines, the conversion part electrically connected to the thin film transistor, the conversion part configured to convert radiation or light into electricity;
a control circuit configured to, for each detection part of the plurality of detection parts, switch an on state and an off state of the thin film transistor included in the detection part;
a signal detection circuit configured to, for each detection part of the plurality of detection parts, read out image data in the on state of the thin film transistor included in the detection part; and
an incident radiation detection part configured to detect a start of radiation incidence, based on a value of the image data read out in the on state of the thin film transistor included in one of the plurality of detection parts,
wherein the control circuit is further configured to, during a process of scanning each of the plurality of control lines extending in the first direction:
select a first control line of the plurality of control lines by switching the thin film transistors electrically connected to the first control line to the on state,
select a second control line of the plurality of control lines by switching the thin film transistors electrically connected to the second control line to the on state, and
select a third control line of the plurality of control lines by switching the thin film transistors electrically connected to the third control line are switched to the on state,

wherein the signal detection circuit is further configured to, during the process of scanning each of the plurality of control lines extending in the first direction:
read out the image data by reading out signals of each of the plurality of data lines electrically connected to the thin film transistors switched in the on state, and
read out correction data by reading out signals of each of the plurality of data lines between selecting the first control line and selecting the second control line and between selecting the second control line and selecting the third control line, wherein each of the thin film transistors of the plurality of detection parts is in the off state during the read out of the correction data.

2. The radiation detector according to claim 1 , further comprising an image processing part configured to process a radiation image based on the image data, wherein the image processing part is configured to correct the image data using the correction data.

3. The radiation detector according to claim 2 , wherein the signal detection circuit is further configured to, during the process of scanning the plurality of control lines extending in the first direction, provide image indexes identifying the image data and the correction data read out at a time of reading out the image data, after reading out the image data, or both before reading out the image data and after reading out the image data.

4. The radiation detector according to claim 3 , wherein the image processing part is further configured to extract the image data and the correction data based on the image indexes, process the correction data, and correct the image data by using the processed correction data.

5. The radiation detector according to claim 1 , wherein the signal detection circuit is further configured to, during the process of scanning the plurality of control lines extending in the first direction, convert a difference between the read out image data and the read out correction data into a digital signal and output the digital signal.

6. The radiation detector according to claim 1 , wherein
the control circuit is further configured to, in response to the incident radiation detection part detecting the start of radiation incidence, scan the plurality of control lines repeatedly.

7. The radiation detector of claim 1 , wherein the signal detection circuit is further configured to read out both of the image data and the correction data every time a control signal for scanning one of the plurality of control lines extending in the first direction is output from the control circuit.

8. The radiation detector of claim 1 , wherein the signal detection circuit is configured to read out the correction data immediately before and immediately after reading out the image data, during the process of scanning the plurality of control lines extending in the first direction.

Assignees

• Toshiba Electron Tubes & Devic
• Canon Electron Tubes & Devices Co Ltd

Inventors

• Onihashi Hiroshi

Classifications

• G01T1/24

  with semiconductor detectors · CPC title

• G21K4/00

  Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens (photographic processes using X-ray intensifiers G03C5/17; discharge tubes comprising luminescent screens H01J1/62; cathode ray tubes for X-ray conversion with optical output H01J31/50) · CPC title

• G01T1/208 Primary

  Circuits specially adapted for scintillation detectors, e.g. for the photo-multiplier section · CPC title

• G01T1/247 Primary

  Detector read-out circuitry (for processing gain or off-set correction H04N) · CPC title

• G01T1/2018

  Scintillation-photodiode combinations · CPC title