22 March 2007 Validation of software for QC assessment of MTF and NPS
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Abstract
Modulation transfer function (MTF), noise power spectrum (NPS), and detective quantum efficiency (DQE) are widely accepted measures of digital radiographic system performance. However the implementation of these measurement methodologies has been limited to a handful of researchers using an assortment of techniques. A prototype edge tool and easy-to-use software program, which can generate MTF, NPS, and DQE results quickly and easily in the field, have been developed. The edge tool consists of 1mm or 250 μ thick tungsten with two polished edges. Edge and NPS data were obtained and analyzed by 3 investigators using three analysis methods: Method A, the software under development for this report; Method B, code available on the web site of one of the investigators [Saunders and Samei, Med. Phys. 33, 308-319 (2006)]; and Method C, code developed by two other of the investigators [Samei and Flynn, Med Phy. 30, 608-622, (2003)]. In all cases the differences between the results using Method B and Method A were less than 1%. The differences between Method A and Method C were larger, up to 5.26%. NPS were calculated using Method A and B. The results were very close, with average errors less than 2.5% for exposures of 27.3, 9.3, and 2.7 μGy. Analysis of data for a 10 cm misalignment shows no significant error for either the 250 μ or 1mm edge. The method developed gives results that correlate closely with results obtained from established methods. The software is easy-to-use and flexible in its application. The Edge Tool developed has the necessary precision to accurately determine the MTF values of the system. Further validation of NPS and DQE is ongoing.
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Walter Peppler, Walter Peppler, Wei Hong, Wei Hong, Robert Steinhauser, Robert Steinhauser, Bruce Whiting, Bruce Whiting, Ehsan Samei, Ehsan Samei, Michael Flynn, Michael Flynn, Steven Don, Steven Don, Nathan Corradini, Nathan Corradini, } "Validation of software for QC assessment of MTF and NPS", Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 65104F (22 March 2007); doi: 10.1117/12.713434; https://doi.org/10.1117/12.713434
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