Quantification of image persistence in a digital angiography system.
Image persistence, as a characteristic of video imaging systems affecting the quality of fast moving fluoroscopic images, is shown to vary considerably. A simple quantitative method for measuring image persistence in a digital angiography system is presented, together with a series of image intensifier exposure-response curves. For the Saticon tube, used with the Siemens 3VA Digitron, it was found that persistence increased for low exposure rates and may increase to 31% at a 120 ms interval. In addition, a sharp increase in image persistence, from 8.3% to 33%, was observed within 18 months from installation of the system.
Okkalides
D P
DP
Radiation Physics Laboratory, Ippokrateio General Hospital, Thessaloniki, Greece.
Raptou
P D
PD
D015901:Angiography, Digital Subtraction; D005471:Fluoroscopy; D006801:Humans; D013679:Technology, Radiologic; D013997:Time Factors