US 2018/0008215 A1Published application

Radiation imaging system

AssigneeCanon Kabushiki Kaisha

InventorsHiroshi Wayama, Minoru Watanabe, Keigo Yokoyama, Satoru Sawada, Kazuya Furumoto

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Abstract

A radiation imaging system includes pixel array, scanning circuit to scan rows of the pixel array, and readout circuit to read signals from the pixel array. Each pixel includes converter to generate electric signal corresponding to radiation and transistor connected to the converter. The readout circuit reads signal from the converter via the transistor. The system performs image capturing modes and conditioning mode of conditioning a threshold voltage of the transistor. In the conditioning mode, the scanning circuit supplies, to a gate of the transistor, an OFF voltage different from OFF voltages in the image capturing modes. The scanning circuit scans the rows in units of at least one row in the image capturing modes, and scans the rows in units of at least two rows in the conditioning mode.

Claims19

Dependent claims

A radiation imaging system including a pixel array having a plurality of pixels which are arranged to form a plurality of rows and a plurality of columns, a scanning circuit configured to scan the plurality of rows of the pixel array, and a readout circuit configured to read out signals from the pixel array, wherein

each pixel includes a converter configured to generate an electric signal corresponding to radiation and a transistor connected to the converter, and the readout circuit is configured to read out a signal from the converter of each pixel via the transistor,
the radiation imaging system performs a plurality of image capturing modes of capturing a radiation image and a conditioning mode of conditioning a threshold voltage of the transistor of each pixel, and in the conditioning mode, the scanning circuit supplies, to a gate of the transistor, an OFF voltage different from OFF voltages in the plurality of image capturing modes, and
the scanning circuit scans the plurality of rows in units of at least one row in the plurality of image capturing modes, and scans the plurality of rows in units of at least two rows in the conditioning mode.

each pixel includes a converter configured to generate an electric signal corresponding to radiation and a transistor connected to the converter, and the readout circuit is configured to read out a signal from the converter of each pixel via the transistor,
the radiation imaging system performs a plurality of image capturing modes of capturing a radiation image and a conditioning mode of conditioning a threshold voltage of the transistor of each pixel, and in the conditioning mode, the scanning circuit supplies, to a gate of the transistor, an OFF voltage different from OFF voltages in the plurality of image capturing modes, and
when a ratio of an ON period of the transistor of each pixel to a scanning period required to scan the plurality of rows by the scanning circuit is set as a duty ratio, a duty ratio in the conditioning mode is not lower than a lowest value of duty ratios in the plurality of image capturing modes.

Dependencies are inferred from the claim text.

Facts

Application: 15/631,205Filed 23 Jun 2017
Priority: JP 2016-1362948 Jul 2016
Published: 11 Jan 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

A61B 6/4208
Arrangements for detecting radiation specially adapted for radiation diagnosis: characterised by using a particular type of detector
A61B 6/4233
Characterised by using a particular type of detector: using matrix detectors
A61B 6/465
Displaying means of special interest: adapted to display user selection data, e.g. graphical user interface, icons or menus
A61B 6/5211
Devices using data or image processing specially adapted for radiation diagnosis: involving processing of medical diagnostic data