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STUK-A196
TAPIOVAARA Markku. STUK-A196. Objective Measurement of Image Quality
in Fluoroscopic X-ray Equipment: FluoroQuality. Helsinki 2003, 50 pp. + apps.
13 pp.
Keywords medical imaging, x-ray imaging, fluoroscopy, image quality,
statistical decision theory, ideal observer, quasi-ideal observer, detectability,
signal-to-noise ratio, SNR, accumulation rate of the signal-to-noise ratio
squared, SNR2rate, Wiener spectrum, spatio-temporal noise power spectrum,
NPS, temporal lag, optimisation, quality control, measurement method,
computer program
Abstract
The report describes FluoroQuality, a computer program that is developed in
STUK and used for measuring the image quality in medical fluoroscopic
equipment. The method is based on the statistical decision theory (SDT) and
the main measurement result is given in terms of the accumulation rate of the
signal-to-noise ratio squared (SNR2rate). In addition to this quantity several
other quantities are measured. These quantities include the SNR of single
image frames, the spatio-temporal noise power spectrum and the temporal lag.
The measurement method can be used, for example, for specifying the image
quality in fluoroscopic images, for optimising the image quality and dose rate in
fluoroscopy and for quality control of fluoroscopic equipment. The theory
behind the measurement method is reviewed and the measurement of the
various quantities is explained. An example of using the method for optimising
a specified fluoroscopic procedure is given. The User’s Manual of the program is
included as an appendix. The program is available free of charge for research
work and program evaluation purposes by contacting the author.
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