Comparison of detectability in pulsed versus continuous fluoroscopy: a simulation study

Richard Aufrichtig; Cecil W. Thomas; Grover W. Gilmore; David L. Wilson

doi:10.1117/12.59515

1 May 1992 Comparison of detectability in pulsed versus continuous fluoroscopy: a simulation study

Richard Aufrichtig, Cecil W. Thomas, Grover W. Gilmore, David L. Wilson

Proceedings Volume 1653, Medical Imaging VI: Image Capture, Formatting, and Display; (1992) https://doi.org/10.1117/12.59515
Event: Medical Imaging VI, 1992, Newport Beach, CA, United States

Abstract

X-ray fluoroscopy is a significant source of x-ray dose to patients and hospital staff. One technique proposed for reducing dose is pulsed fluoroscopy at reduced frame rates, typically 15 frames/sec for cardiac angiography. Because the human visual system acts as a temporal low-pass filter, simply reducing the frame rate may not allow a dose reduction. In fact, one can argue that for equivalent visualization, the dose per frame should be doubled when the frame rate is halved. We address the question of proper dose by comparing detectability in simulated pulsed and continuous fluoroscopy displays on a unique device called the video tachistoscope. The visual task for the subjects is to detect stationary, computer-generated, low- contrast disks on a flat background in the presence of noise. The disks form a contrast-detail phantom and are displayed in continuous and pulsed mode on either side of a single video monitor. We find similar detectability and visibility in noise when the dose for pulsed is reduced by 25% of that for continuous.

Citation Download Citation

Richard Aufrichtig, Cecil W. Thomas, Grover W. Gilmore, and David L. Wilson "Comparison of detectability in pulsed versus continuous fluoroscopy: a simulation study", Proc. SPIE 1653, Medical Imaging VI: Image Capture, Formatting, and Display, (1 May 1992); https://doi.org/10.1117/12.59515

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