Izgubna kompresija slik v stomatološki slikovni diagnostiki = Lossy image compression in dental diagnostic imaging : doktorsko delo
Fidler, Aleš, 1973-
The aim of the study was to evaluate the impact of JPEG lossy image compression on the determination of alveolar bone gain by quantitative digitalsubtraction radiography (DSR). Nine dry domestic pig ...mandible sections were radiographed three times ("Baseline", "No change", and "Gain") with standardized projection geometry. Bone gain was simulated by adding artificialbone chips (1, 4, and 15mg). Images were registred either before or after compression at four compression levels (1:7, 1:16, 1:22, and 1:31). No change areas in compressed and subtracted ĆNo change - BaselineĆ images and bone gain volumes in compressed and subtracted "Gain - Baseline" images were calculated and compared to the corresponding measurements performed in original subtracted images. Measurements of no change areas ("No change - Baseline") were only slightly affected by compressions of down to 1:22, applied either before or after registration. Simulated gain of alveolar bone ("Gain - Baseline") was underestimated when compression was performed before registration. The underestimation was bigger when small bone chips (1 mg) weremeasured and when higher compression rates were used. Bone chips of 4 and 15 mg were only slightly underestimated at compressions of 1:7, 1:16, and 1:22, applied before registration. Lossy JPEG commpression does not affect themeasurements of no change areas by DSR. Images undergoing substraction should be registered before compression and if so, J90 compression with compression ratio of 1:7 can be used to detect and measure 4mg and larger bonegain.
Vrsta gradiva - disertacija
; neleposlovje za odrasle
Založništvo in izdelava - Ljubljana : [A. Fidler], 2007
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