H - Electricity – 05 – G
Patent
H - Electricity
05
G
358/11.2
H05G 1/00 (2006.01) A61B 6/00 (2006.01) H04N 5/32 (2006.01) H05G 1/64 (2006.01)
Patent
CA 1132266
ABSTRACT A method and apparatus for producing visible difference images derived from an X-ray image of an anatomical subject, comprising the steps of producing an X-ray image, converting it into television fields comprising trains of on-going video signals, digitally storing and integrating the on-going video signals over a time interval corresponding to a plurality of successive television fields and thereby producing stored and integrated video signals, recovering the stored and integrated video signals from storage and thereby producing integrated video signals, producing video difference signals by performing a subtraction between the integrated video signals and the on- going video signals outside the time interval, and converting the video difference signals into visible television difference images representing on-going changes in the X-ray image. The subtraction may be performed digitally or on ananalog basis. The time interval is preferably at least on the order of one complete cardiac cycle. One embodiment involves digitally storing and integrating the on-going video signals over a series of additional time intervals each corresponding to a plurality of successive television fields, preferably on the order of four television fields, and carrying out a series of subtractions between each of the additional successive inte- grated video signals and the first mentioned integrated video signals serving as integrated mask video signals, and thereby producing a series of successive digital difference video signals.
327771
Smart & Biggar
Wisconsin Alumni Research Foundation
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