Residual image erasure control using photomultiplier bleeder res

Details Residual image erasure control using photomultiplier bleeder res Residual image erasure control using photomultiplier bleeder res

1985-06-05

1987-08-18

Howell, Janice A.

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

2503272, G01T 1105

Patent

active

046879374

ABSTRACT:
In a radiation image recording and reproducing system using a stimulable phosphor sheet, a voltage generated at a bleeder resistor of a photomultiplier for conducting image read-out is detected at the step of radiation image read-out at least for the stimulable phosphor sheet or a portion thereof where the level of X-ray exposure amount is higher than a predetermined level, and the exposure amount of erasing light is controlled on the basis of the detected voltage. Or, the erasing light exposure amount is controlled on the basis of an output current of the photomultiplier when the output current is equal to or smaller than a predetermined value when is smaller than a saturated value of the output current, and the bleeder resistor voltage of the photomultiplier is detected and the erasing light exposure amount is controlled on the basis of the detected voltage when the output current of the photomultiplier is larger than the predetermined value.

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patent: 4584482 (1986-04-01), Suzuki et al.

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