Medical Biophysics 3503G Lecture Notes - Lecture 3: Mammography, Hyperbola
22 Apr 2014
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Document Summary
Contrast-detail analysis continued: hyperbola shape defined by two asymptotes, detection limited by. Systems: shows trade-off between resolution and snr, if you want finer spatial resolution, you have to decrease your snr and vice versa, resolution vs. snr trade-off in digital mammography (not tested on) Cancer triggers inflammatory processes that cause calcifications of healthy tissue around tumour. Image a large population including many individuals with and without disease: choose ordinal (put them in order) parameter or criteria as basis for diagnosis, objective: size, contrast, etc, subjective: n-point indicating radiologist"s certainty about diagnosis (typically n-5). False positive fraction ( fpf)= incorrect positive diagnoses. Tpf for all possible places we can out the threshold: plot (fpf, tpf) pairs obtained at each threshold, by definition the curve has to include (0,0) and (1,1) Detector: omniscient (always right); would expect tpf to be 1, and.
