A scanning system for digital analysis of cineangiography films.
A system for scanning and digital analysis of cinefilms is presented and its performance is compared with entirely digital radiographic equipment. Apart from the difference between logarithmic and linear gray-scale representation, a higher noise level was found in the scanning system. When its spatial resolution was assessed visually, it was comparable to that of the digital system, although lower than when the cinefilming and scanning steps were evaluated separately. Algorithms for the correction of varying exposure and geometric ("pin-cushion") distortion are also presented. It is concluded that digital analysis after scanning of cinefilms can be a useful alternative to completely digital cineradiographic studies.
Smedby
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Department of Diagnostic Radiology, Uppsala University, Sweden.
D000465:Algorithms; D016477:Artifacts; D002932:Cineangiography / Q000379:methods / Q000592:standards*; D005069:Evaluation Studies as Topic; D006801:Humans; D007089:Image Enhancement / Q000295:instrumentation / Q000592:standards; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D012986:Software Validation