04355331 is referenced by 46 patents and cites 3 patents.

An x-ray source projects successive high and low energy x-ray beam pulses through a body and the resultant x-ray images are converted to optical images. Two image pick-up devices such as TV cameras that have synchronously operated shutters receive the alternate images and convert them to corresponding analog video signals. In some embodiments, the analog signals are converted to a matrix of digital pixel signals that are variously processed and subtracted and converted to signals for driving a TV monitor display and analog storage devices. In other embodiments the signals are processed and subtracted in analog form for display. The high and low energy pulses can follow each other immediately so good registration between subtracted images is obtainable even though the anatomy is in motion. The energy levels of the x-ray pulses are chosen to maximize the difference in attenuation between the anatomical structure which is to be subtracted out and that which remains.

Title
X-ray image subtracting system
Application Number
6/229249
Publication Number
4355331
Application Date
January 28, 1981
Publication Date
October 19, 1982
Inventor
William H Wesbey
New Berlin
WI, US
Gary S Keyes
Hartland
WI, US
Jean Pierre J Georges
Waukesha
WI, US
Agent
Ralph G Hohenfeldt
Assignee
General Electric Company
IPC
H04N 5/32
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