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Binderless storage phosphor screen with needle shaped crystals

a technology of phosphor screen and needle crystal, which is applied in the direction of photosensitive material auxillary/base layer, coating, photographic process, etc., can solve the problem that the production method cannot be used to produce high-quality screens, and achieve the effect of low noise, high sharpness, and good compromise between the speed of the recording system

Inactive Publication Date: 2001-07-12
AGFA GEVAERT AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0008] It is an object of the invention to provide a stimulable phosphor screen useful in an X-ray recording system with a very good compromise between speed of the recording system (i.e. as low as possible patient dose) with an image with high sharpness and low noise.
[0015] It has now been found that it is possible to improve a binderless phosphor screen comprising an alkali halide phosphor by producing it in such a manner that the phosphor is present on the support as needle-like crystals having a specific crystal orientation. It has been found that, when a phosphor screen showing high

Problems solved by technology

However, this production method can not be used to produce high quality screens with every arbitrary phosphor available.

Method used

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  • Binderless storage phosphor screen with needle shaped crystals
  • Binderless storage phosphor screen with needle shaped crystals
  • Binderless storage phosphor screen with needle shaped crystals

Examples

Experimental program
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Embodiment Construction

[0047] Preparation of the phosphor

[0048] CsBr:Eu screens were made via thermal vapour deposition of CsBr and EuOBr. To this aim, CsBr was mixed with EuOBr and placed in a container in a vacuum deposition chamber. The phosphor was deposited on a glass disk with a thickness of 1.5 mm and a diameter of 40 mm. The distance between the container and the substrate was 10 cm. During evaporation, the substrate was rotated at 12 rpm. The container with starting materials was heated to a temperature of 750.degree. C.

[0049] Before the start of the evaporation, the chamber was evacuated to a pressure of 4.10.sup.-5 mbar. During the evaporation process, Ar was introduced in the chamber.

[0050] Variables in the deposition process were the substrate temperature and the Ar gas pressure. The different screens were produced under the conditions listed in Table 1. The Eu-concentration in the evaporated screens was measured with X-ray fluorescence and was of the order of 800 ppm.

[0051] Via Scanning Elec...

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Abstract

A binderless storage phosphor screen with needle shaped crystals, wherein the phosphor is an alkalihalide phosphor and the needles show high [100] unit cell orientation in the plane of the screen.

Description

[0001] The applications claims the benefit of U.S. Provisonal Application No. 60 / 211,927 filed Jun. 16, 2000.[0002] The present invention relates to a binderless storage phosphor screen with needle shaped phosphors.[0003] A well known use of storage phosphors is in the production of X-ray images. In U.S. Pat. No. 3,859,527 a method for producing X-ray images with a photostimulable phosphor, which are incorporated in a panel is disclosed. The panel is exposed to incident pattern-wise modulated X-ray beam and as a result thereof the phosphor temporarily stores energy contained in the X-ray radiation pattern. At some interval after the exposure, a beam of visible or infra-red light scans the panel to stimulate the release of stored energy as light that is detected and converted to sequential electrical signals which (are) be processed to produce a visible image. For this purpose, the phosphor should store as much as possible of the incident X-ray energy and emit as little as possible o...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K11/77G03C1/005G03C1/12G03C1/76G03C5/16G03C5/17G21K4/00
CPCC09K11/7733G03C1/0051G03C1/12G03C1/122G03C1/7614G03C5/16G03C5/17G21K4/00G21K2004/06G03C2200/03G03C2001/03511G03C2001/03535G03C2001/7635G03C2200/40G03C2007/3025G03C2005/168
Inventor HELL, ERICHFUCHS, MANFREDMATTERN, DETLEFSCHMITT, BERNHARDLEBLANS, PAUL
Owner AGFA GEVAERT AG
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