Radiant energy – Source with recording detector – Using a stimulable phosphor
Patent
1993-09-08
1995-05-23
Hannaher, Constantine
Radiant energy
Source with recording detector
Using a stimulable phosphor
378 62, 378207, G03B 4202
Patent
active
054183731
ABSTRACT:
A tube voltage, at which each of at least two kinds of radiation having different energy levels is produced, is adjusted such that a ratio between a change in the image density of bones, which change occurs due to a beam hardening phenomenon of the radiation having a high energy level, and a change in the image density of the bones, which change occurs due to a beam hardening phenomenon of the radiation having a low energy level, may become approximately equal to a ratio between subtraction factors employed in a subtraction process. Each of at least two kinds of the radiation, each of which has been produced at the thus adjusted tube voltage, is irradiated to one of at least two stimulable phosphor sheets, and radiation images of the object are thereby stored on the stimulable phosphor sheets. The radiation images are then photoelectrically read out, and digital image signals are thereby obtained. Image signal components of the digital image signals, which represent corresponding picture elements in the radiation images, are then subtracted from each other, and a difference signal is thereby obtained which represents the image of only the bones represented by the radiation images.
REFERENCES:
patent: 3996471 (1976-12-01), Fletcher et al.
patent: 4761739 (1988-08-01), Shimura
patent: 5187731 (1993-02-01), Shimura
patent: 5210415 (1993-05-01), Ito
Fuji Photo Film Co. , Ltd.
Glick Edward J.
Hannaher Constantine
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