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How should low-contrast detail detectability be measured in fluoroscopy?
Linköping University, Faculty of Health Sciences. Linköping University, Department of Medicine and Care, Radiation Physics. Östergötlands Läns Landsting, Centre of Surgery and Oncology, Department of Radiation Physics.ORCID iD: 0000-0003-3352-8330
2004 (English)In: Medical physics (Lancaster), ISSN 0094-2405, Vol. 31, no 9, 2564-2576 p.Article in journal (Refereed) Published
Abstract [en]

The relationship and precision of four methods for measuring the low-contrast detail detectability in fluoroscopic imaging were studied. These included the physical measurement of the accumulation rate of the square of the signal-to-noise ratio (SNRrate2), two-alternative forced-choice (2-AFC) experiments, sixteen-alternative forced-choice (16-AFC) experiments and subjective determination of the threshold contrast. The precision and sensitivity of the threshold contrast measurement were seen to be modest in the constancy testing of fluoroscopic equipment: only large changes in system performance could be reliably detected by that method. The measurement of the SNRrate2 is suggested instead. The relationship between the results of the various methods were studied, and it was found that human performance can be related to SNRrate2 by introducing the concept of the effective image information integration time (teff). When measured for an unlimited observation time, it depicts the saturation of human performance in detecting a static low-contrast detail in dynamic image noise. Here, teff was found to be about 0.6 s in 2-AFC tests and 0.3 s in 16-AFC tests. © 2004 American Association of Physicists in Medicine.

Place, publisher, year, edition, pages
2004. Vol. 31, no 9, 2564-2576 p.
Keyword [en]
fluoroscopy, image quality, detectability, threshold contrast detail detectability, signal-to-noise ratio, quality assurance, multiple-alternative forced-choice, statistical decision theory
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-23442DOI: 10.1118/1.1779357Local ID: 2893OAI: diva2:243756
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2013-09-03

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Sandborg, Michael
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