# US 5,352,903 A · Radiation image read-out apparatus

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- Number: US 5,352,903 A
- Document ID: US5352903A
- Status: Granted
- Kind: A
- Application number: 08/208,380
- Filed: 1994-03-10
- Granted: 1994-10-04
- Earliest claimed: 1993-03-11
- Assignees: Fuji Photo Film Co., Ltd.
- Inventors: Katsuhiro Kohda; Shigeru Saotome
- Web page: https://patentgrep.com/patent/US5352903A

## CPC

- G01T 1/2014: {Reading out of stimulable sheets, e.g. latent image}
- 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)

## Abstract

A radiation image read-out apparatus comprises a single light guide member constituted of a light guiding material. The light guide member comprises two input end faces for collecting light, which is emitted along a scanning line of stimulating rays and from two surfaces of a stimulable phosphor sheet having a radiation image stored thereon, and output end faces for radiating out the light, which has entered into the light guide member from the two input end faces. A single photodetector is located in close contact with the output end faces and photoelectrically detects the light radiated out of the light guide member. The input end faces of the light guide member comprise a first input end face for collecting the light, which is emitted from the front surface of the stimulable phosphor sheet, and a second input end face for collecting the light, which is emitted from the back surface of the stimulable phosphor sheet. The first and second input end faces of the light guide member stand facing the same scanning line.

## Claims

### Claim 1

A radiation image read-out apparatus, wherein a stimulable phosphor sheet, on which a radiation image has been stored, is scanned with stimulating rays, which cause the stimulable phosphor sheet to emit light in proportion to the amount of energy stored thereon during its exposure to radiation, the radiation image read-out apparatus comprising:
i) a single light guide member constituted of a light guiding material and comprising;
a) two input end faces for collecting the light, which is emitted along the scanning line of the stimulating rays and from two surfaces of said stimulable phosphor sheet, and
b) output end faces for radiating out the light, which has entered into said light guide member from the two input end faces, and
ii) a single photodetector, which is located in close contact with the output end faces and photoelectrically detects the light having been radiated out of said light guide member,
wherein the input end faces of said light guide member comprise a first input end face for collecting the light, which is emitted from the front surface of said stimulable phosphor sheet, and a second input end face for collecting the light, which is emitted from the back surface of said stimulable phosphor sheet, and
the first input end face and the second input end face of said light guide member stand facing the same scanning line.

### Claim 2 (depends on 1)

An apparatus as defined in claim 1 wherein the input end faces of said light guide member respectively stand facing the front surface and the back surface of said stimulable phosphor sheet, portions of said light guide member, which are adjacent to the output end faces, extend towards a side of a conveyance path, along which said stimulable phosphor sheet is conveyed, and the output end faces of said light guide member are located in close contact with said photodetector, which is located at a position outward from the conveyance path.

### Claim 3 (depends on 1)

An apparatus as defined in claim 1 wherein portions of said light guide member, which are adjacent to the output end faces, are cut into a plurality of strips, the strips are bundled, and end faces of the bundled strips, which end faces constitute the output end faces, are located in close contact with said photodetector.

### Claim 4 (depends on 1)

An apparatus as defined in claim 1 wherein the output end faces of said light guide member are combined with each other such that they are flush with each other and forms a single combined output end face, and the single combined output end face is located in close contact with said photodetector.

### Claim 5 (depends on 1)

An apparatus as defined in claim 1 wherein said stimulating rays are a laser beam.