Apparatus for reading radiation image information

Details Apparatus for reading radiation image information Apparatus for reading radiation image information

1991-04-19

1992-08-11

Hannaher, Constantine

Radiant energy

Automatic/serial detection of similar sources

G03B 4200

Patent

active

051381613

ABSTRACT:
The improved apparatus for reading radiation image information uses a scanning optical unit to scan excitation light two-dimensionally over the surface of a stimulable phosphor sheet having radiation image information stored and recorded therein, so that stimulated emission is produced in accordance with the recorded radiation image information and collected by means of a light collecting unit that is composed of a condenser mirror and an optical guide and that is located along and close to the main scanning of said excitation light, which stimulated emission is thereafter read photoelectrically with a photodetector. In order to insure that the flare produced from the phosphor sheet or the light collecting unit or by some other factors will not make a second entry into the phosphor sheet to produce undesirable stimulated emission, the apparatus includes at least one of the following means: a flare absorbing means that is located on the back side of the condenser mirror; a slit plate provided between the scanning optical unit and the light collecting unit; a flexible light-shielding member suspended upstream of the main scanning line; and a means that is provided on the exit face of the optical guide to prevent the flare from being reflected towards the entrance face of the optical guide. Because of this structural feature, the radiation image information read as an electric signal with the apparatus provides an image signal of good quality that has high contrast but low noise.

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