# US 9,521,347 B2 · Radiation imaging apparatus and radiation imaging system

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- Number: US 9,521,347 B2
- Document ID: US9521347B2
- Status: Granted
- Kind: B2
- Application number: 14/692,856
- Filed: 2015-04-22
- Published: 2015-11-05
- Granted: 2016-12-13
- Earliest claimed: 2014-05-01
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Jun Kawanabe; Minoru Watanabe; Keigo Yokoyama; Masato Ofuji; Kentaro Fujiyoshi; Hiroshi Wayama
- Web page: https://patentgrep.com/patent/US9521347B2

## CPC

- G01T 1/17: Circuit arrangements not adapted to a particular type of detector {(pulse-selection circuits H03K, G01R)}
- H04N 23/30: for generating image signals from X-rays
- H04N 25/62: Detection or reduction of noise due to excess charges produced by the exposure, e.g. smear, blooming, ghost image, crosstalk or leakage between pixels
- G01T: MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N23/00; tubes for determining the presence, intensity, density or energy of radiation or particles H01J47/00)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A radiation imaging apparatus includes a plurality of conversion elements configured to convert radiation into an electric signal to obtain a radiation image, a sensor for monitoring radiation, a processing unit configured to process signals output from output electrodes of the plurality of conversion elements and an output electrode of the sensor, and a shield. The signal output from the output electrode of the sensor is supplied to the processing unit via a signal line. The shield is arranged such that capacitive coupling between the output electrodes of the plurality of conversion elements and the signal line is reduced.

## Claims

### Claim 1

A radiation imaging apparatus, comprising:
a plurality of conversion elements configured to convert radiation into an electric signal to obtain a radiation image;
a sensor for monitoring radiation;
a processing unit configured to process signals output from output electrodes of the plurality of conversion elements and an output electrode of the sensor; and
a shield,
wherein the signal output from the output electrode of the sensor is supplied to the processing unit via a signal line, and
the shield is arranged such that capacitive coupling between the output electrodes of the plurality of conversion elements and the signal line is reduced.

### Claim 2 (depends on 1)

The radiation imaging apparatus according to claim 1, wherein
the shield includes a portion arranged between the output electrodes of the plurality of conversion elements and the signal line.

### Claim 3 (depends on 1)

The radiation imaging apparatus according to claim 1, wherein
the signal line is used for transmitting a signal from the output electrode of the sensor to the processing unit, and for transmitting a signal from the output electrode of at least one conversion element of the plurality of conversion elements to the processing unit.

### Claim 4 (depends on 1)

The radiation imaging apparatus according to claim 1, wherein
the signals output from the output electrodes of the plurality of conversion elements are transmitted to the processing unit via a column signal line, which is different from the signal line.

### Claim 5 (depends on 4)

The radiation imaging apparatus according to claim 4, wherein
in an orthogonal projection on a surface parallel to an imaging area in which the plurality of conversion elements are arrayed, the signal line does not overlap with the output electrodes of the plurality of conversion elements.

### Claim 6 (depends on 4)

The radiation imaging apparatus according to claim 4, wherein
the shield includes a portion arranged on the same layer as the output electrodes of the plurality of conversion elements.

### Claim 7 (depends on 1)

The radiation imaging apparatus according to claim 1, wherein
the shield includes a portion arranged on the same layer as a bias line for supplying a bias potential to the conversion elements and the sensor.

### Claim 8 (depends on 1)

The radiation imaging apparatus according to claim 1, wherein
the processing unit detects an electric signal that appears in the shield.

### Claim 9 (depends on 8)

The radiation imaging apparatus according to claim 8, wherein
based on the electric signal that appears in the shield, the processing unit corrects a signal obtained from the sensor.

### Claim 10 (depends on 1)

A radiation imaging system, comprising:
a radiation source configured to generate radiation; and
the radiation imaging apparatus according to claim 1.