# US 2016/0366755 A1 · X-ray imaging apparatus

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2016/0366755 A1
- Document ID: US20160366755A1
- Status: Published application
- Kind: A1
- Application number: 15/180,407
- Filed: 2016-06-13
- Published: 2016-12-15
- Earliest claimed: 2015-06-12
- Assignees: Vieworks Co., Ltd.
- Applicants: Vieworks Co., Ltd.
- Inventors: Dong Kook Han
- Web page: https://patentgrep.com/patent/US20160366755A1

## CPC

- A61B 6/542: {involving control of exposure}
- A61B 6/4233: {using matrix detectors}
- H05G 1/44: in which the switching instant is determined by measuring the amount of radiation directly {(dosimetry in general G01T1/02)}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- H05G: X-RAY TECHNIQUE (investigating or analysing materials by the use of X-rays G01N23/00; apparatus for X-ray photography G03B42/02; X-ray tubes H01J35/00; TV systems having X-ray input H04N5/321)

## Abstract

The present invention relates to an X-ray imaging apparatus that includes a bias voltage source that provides a bias voltage to pixels that detect X-rays and an automatic exposure control (AEC) processing unit that detects a current flowing between the bias voltage source and the pixels and outputs an AEC signal.

## Claims

### Claim 1

An X-ray imaging apparatus comprising:
a bias voltage source that provides a bias voltage to pixels that detect X-rays; and
an automatic exposure control (AEC) processing unit that detects a current flowing between the bias voltage source and the pixels and outputs an AEC signal.

### Claim 2 (depends on 1)

The X-ray imaging apparatus of claim 1, wherein the bias voltage source provides the bias voltage to photodiodes included in the pixels through a common electrode, and the AEC processing unit detects a current flowing between the common electrode and the bias voltage source.

### Claim 3 (depends on 1)

The X-ray imaging apparatus of claim 1, wherein the AEC processing unit includes:
a detector that detects the current and converts into a voltage signal; and
an output unit that outputs an AEC signal depending on a voltage output by the detector.

### Claim 4 (depends on 3)

The X-ray imaging apparatus of claim 3, wherein the output unit includes:
an integrator that integrates the voltage and outputs a voltage according to the integration result; and
a comparator that compares the voltage according to the integration result and a reference value and outputs the comparison result as the AEC signal.

### Claim 5 (depends on 4)

The X-ray imaging apparatus of claim 4, wherein the output unit further includes a compensator that compensates for an output of the integrator due to an offset of the current.

### Claim 6 (depends on 5)

The X-ray imaging apparatus of claim 5, wherein the compensator provides a voltage corresponding to an output value of the detector corresponding to an offset of the current, to any one of input electrodes of the integrator.

### Claim 7 (depends on 5)

The X-ray imaging apparatus of claim 5, wherein the output unit further includes an offset processor that offsets the voltage according to the integration result by an offset voltage due to the compensator.

### Claim 8 (depends on 3)

The X-ray imaging apparatus of claim 3, wherein the output unit includes:
an integrator that integrates the voltage and outputs a voltage according to the integration result; and
an amplifier that amplifies the voltage according to the integration result and outputs the amplified voltage as the AEC signal.

### Claim 9 (depends on 8)

The X-ray imaging apparatus of claim 8, wherein the output unit further includes a compensator that compensates for an output of the integrator due to an offset of the current.

### Claim 10 (depends on 9)

The X-ray imaging apparatus of claim 9, wherein the compensator provides a voltage corresponding to an output value of the detector corresponding to an offset of the current, to any one of input electrodes of the integrator.

### Claim 11 (depends on 9)

The X-ray imaging apparatus of claim 9, wherein the output unit further includes an offset processor that offsets the voltage according to the integration result by an offset voltage due to the compensator.

### Claim 12 (depends on 3)

The X-ray imaging apparatus of claim 3, wherein the detector includes a switch that allows bypassing the current.

### Claim 13 (depends on 12)

The X-ray imaging apparatus of claim 12, wherein the switch is opened or closed according to an operation state of an X-ray detector.

### Claim 14 (depends on 2)

The X-ray imaging apparatus of claim 2, wherein the common electrode is classified into a plurality of groups, and the AEC processing unit is included in each of the groups.