X-ray or gamma ray systems or devices – Electronic circuit – Exposure timer
Patent
1984-11-21
1987-02-17
Church, Craig E.
X-ray or gamma ray systems or devices
Electronic circuit
Exposure timer
358111, H05G 164
Patent
active
046445757
ABSTRACT:
A slit collimation system includes a signal absorptive plate assembly having a narrow slit located between a source of x-ray radiation and an object such as a patient undergoing a diagnostic imaging procedure. An image intensifier tube is located on the other side of the object and is optically coupled to an imaging device such as a television camera. The camera generates an image of the slit as well as x-ray scatter in succeeding TV frames as the slit is scanned, i.e. moved linearly over the object. Each TV frame is digitized and fed into a recursive loop including a digital memory adapted to store a complete TV frame which is comprised of an array of pixels. Pixel intensity values of successive frames are logically combined so that the video information in the shadow of the slit is accepted while the remainder of the video information which includes scatter and noise is rejected resulting in an x-ray image which is free of scatter.
REFERENCES:
patent: 4436095 (1984-03-01), Kruger
patent: 4468697 (1984-08-01), Verhoeven
patent: 4493096 (1985-01-01), Rieke
patent: 4549307 (1985-10-01), Macovski
Kruger Robert A.
Sorenson James A.
Church Craig E.
Freeman John C.
University of Utah
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