Fluoroscopic method with reduced x-ray dosage

Details Fluoroscopic method with reduced x-ray dosage Fluoroscopic method with reduced x-ray dosage

1991-12-09

1993-06-29

Porta, David P.

X-ray or gamma ray systems or devices

Electronic circuit

Exposure timer

378 95, 378 98, 358111, H05C 164

Patent

active

052241416

ABSTRACT:
A method for fluoroscopically observing a living creature with reduced x-ray dosage is usable with a video monitor for displaying frames of image samples received during respective ones of frame scan intervals that regularly and successively occur at a display frame rate sufficiently high that brightness flicker is acceptably low to a human observer; an x-ray source that can be gated on for intervals not as long as a display frame; a fluoroscopic camera, including a raster-scanning video camera and a x-ray-to-light conversion apparatus with persistence not appreciably longer than a display frame; and frame filling apparatus for grabbing frames of image samples and interpolating between successively grabbed frames of image samples, when necessary, to generate frames of image samples at said display frame rate. During ones of said successive frame scan intervals, x-ray radiation is directed from the gated x-ray source through the living creature; the x-ray shadow of at least a portion of the living creature is viewed with the fluoroscopic camera; and the frame filling apparatus grabs frames of image samples from the raster-scanning video camera to be stored in frame stores and used as bases from which to compute fill frames of image samples. The frame filling apparatus continuously supplies to the video monitor the frames of image samples it generates at display frame rate.

REFERENCES:
patent: 4555728 (1985-11-01), Fenster et al.
patent: 4644398 (1987-02-01), Shimoni
patent: 4905264 (1990-02-01), Ogura

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