Radiant energy – Automatic/serial detection of similar sources
Patent
1980-02-26
1981-06-30
Smith, Alfred E.
Radiant energy
Automatic/serial detection of similar sources
250337, G03C 516, G01T 111
Patent
active
042764734
ABSTRACT:
In a radiation image recording system in which a radiation image is once recorded in a stimulable phosphor and then read out and reproduced on a recording material, the gradation of the radiation image is processed to enhance the diagnostic efficiency and accuracy of the image. The radiation image is read out by scanning the stimulable phosphor by a stimulating ray to cause the phosphor to emit light of the amount corresponding to the radiation energy stored in the phosphor. The emitted light is detected and converted to an electric signal. The level of the electric signal is converted in such a way that the maximum level of the signal corresponding to the maximum density of the radiation image is converted to a level resulting in the optical density of 1.5 to 2.8 in the reproduced image on a recording material and the minimum level corresponding to the minimum density is converted to a level resulting in the optical density of fog density of the recording material to fog density plus 0.3, and a density curve in a coordinate having an ordinate representing the optical density and an abscissa representing the level of the electric signal has a positive gradient from the minimum level to the maximum level.
REFERENCES:
patent: 3859527 (1975-01-01), Luckey
patent: 3975637 (1976-08-01), Ikedo et al.
patent: 4149076 (1979-04-01), Albert
Ishida Masamitsu
Kato Hisatoyo
Matsumoto Seiji
Baker Joseph J.
Ferguson Jr. Gerald J.
Fields Carolyn E.
Fuji Photo Film Co. , Ltd.
Smith Alfred E.
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