PMID: 9167156May 1, 1997Paper

Efficiency of low-contrast detail detectability in fluoroscopic imaging

Medical Physics
M J Tapiovaara

Abstract

The detectability of a static low-contrast detail in the dynamic fluoroscopic image of a homogeneous phantom was assessed by physical measurement of the signal-to-noise ratio (SNR) and by psychophysical measurement of the human observer detectability index d'. The two-alternative forced-choice method was used for human observer tests. The image data consisted of digitally recorded fluoroscopic image sequences which were displayed in a continuous loop of varying length (1-50 frames) at a rate of 25 frames/s. Human detection performance was seen to improve with the SNR in all cases studied: when the signal was made stronger, the image noise lower, or when the SNR in the image sequence was made higher by increasing the length of the image sequence. The results imply that the statistical efficiency of humans decreases slowly when the number of frames in the displayed loop is increased. This decrease of efficiency with loop length was not seen in all test series, however, and it is possible that the phenomenon is partly related to the high d' values found at the greatest loop lengths studied. When the display contrast was high, the statistical efficiency of the human observer was 30%-40% for both static and dynamic images. The effic...Continue Reading

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Citations

Nov 16, 2001·The British Journal of Radiology·E VanoC Macaya
Mar 3, 2001·The British Journal of Radiology·E VanoC Macaya
Jul 11, 2006·Journal of Biomedical Optics·Brian W PogueKeith D Paulsen
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Mar 29, 2019·Physics in Medicine and Biology·Marco BertoliniCaterina Ghetti

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