Autoradiography system for stimulable phosphor foils

Details Autoradiography system for stimulable phosphor foils Autoradiography system for stimulable phosphor foils

1988-10-24

1990-06-05

Fields, Carolyn E.

Radiant energy

Automatic/serial detection of similar sources

2504841, G01N 2304

Patent

active

049316435

ABSTRACT:
An autoradiography system for obtaining exposures from, and reading the latent image stored in, stimulable phosphor foils includes a cassette which receives a preparation of low energy radiation emitting tissue to be examined and two stimulable phosphor foils separated by a shielding plate consisting of material permeable to high energy radiation, but impermeable to low energy radiation. The cassette is surrounded by a high radiation absorbing housing. The preparation is disposed against one of the foils, so that the low energy radiation therefrom forms a latent image on the adjacent foil, but cannot pass through the shielding plate to form an image on the other foil. Both foils will, however, record and form a latent image of high energy radiation which may not be absorbed by the cassette housing. One of the foils thus exhibits a latent image due solely to background or thermal radiation, while the other phosphor foil has a latent image corresponding to the tissue, as well as the background and thermal radiation. A processing circuit is included in a read out system having a subtraction stage which subtracts electronic signals corresponding to the two latent images from each other, so that a tissure image free of background and thermal radiation noise is obtained. Insensitivity to thermal noise is obtained by insulating and cooling the cassette.

REFERENCES:
patent: 4686368 (1987-08-01), Anderson et al.
patent: 4734581 (1988-03-01), Hashive
"Color Photographs of The Night Sky are Made By Refrigerating The Film," Scientific American, vol. 221, No. 2, Aug. 1969, pp. 125-129.
"Product Review," Nature, vol. 326, Apr. 16, 1987, p. 725.

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