20.500.12556/DKUM-80997 Razvoj metode po-obdelave trirazsežnih rekonstrukcij medicinskih preiskav z računalniško tomografijo magistrsko delo Development of post-processing method for three-dimensional reconstruction of computed tomography medical examinations V magistrskem delu je opisan proces razvoja metode in določanja ustreznih parametrov po-obdelave trirazsežnih rekonstrukcij segmentacij preiskav z računalniško tomografijo (CT). Raziskava je omejena na primere večjih kostnih defektov lobanjskih kosti. V delu je naprej predstavljen postopek segmentacije in trirazsežne rekonstrukcije rezultatov CT preiskave v obliki DICOM podatkov. Na osnovi enega primera je predstavljen vpliv debeline sloja CT preiskave na velikost stopničastega efekta in gostoto trikotnikov mreže rekonstruiranega modela. Enak primer je potem uporabljen za predstavitev posameznih operacij po-obdelave za glajenje, zmanjševanje gostote trikotnikov, sproščanje in urejanje mreže rekonstruiranega modela. Predstavljeni sta tudi metodi ocenjevanja učinka glajenja in določanja odstopanja od začetne trirazsežne geometrije. Glede na rezultate raziskave ne enem primeru z dvema različnima debelinama slojev preiskave sta bila izbrana dva postopka z različnimi vrednostmi parametrov po-obdelave, ki sta bila uporabljena za po-obdelavo trirazsežnih rekonstrukcij desetih različnih primerov CT preiskav lobanj. Opravljena je bila analiza učinkov posameznih operacij po-obdelave na gladkost modela, gostoto trikotnikov in zagotavljanje dopustnega odstopanja od prvotne geometrije rekonstrukcije. V zaključku so podane glavne ugotovitve predstavljene raziskave in podane smernice za nadaljnje delo na obravnavanem področju. This work describes the process of method development and determination of appropriate parameters for post-processing of three-dimensional reconstructions of segmentation examinations with computed tomography (CT). Research is limited to cases of major cranial bone defects. The work further presents the process of segmentation and three-dimensional reconstruction of the results of CT examination in the DICOM data form. Based on one example, the influence of the thickness of the CT examination layer on the magnitude of the staircase effect and the density of the triangles of the mesh of the reconstructed model is presented. The same example is then used to present the individual post-processing operations for smoothing, reducing, relaxing and regularizing the mesh of the reconstructed model. Methods for estimating the smoothing effect and determining the deviation from the initial three-dimensional geometry are also presented. Based on the results of one study with two different thicknesses of the examination layers, two procedures with different values of post-processing parameters were selected and used post-processing of three-dimensional reconstructions of ten different cases of CT examinations of skulls. An analysis of the effects of individual post-processing operations on the smoothness of the model, the density of the triangles, and deviations from the original geometry of the reconstruction was performed. In conclusion, the main findings of the presented research are presented and guidelines for further work in the field are given. segmentacija poobdelava odstopanja trirazsežna rekonstrukcija računalniška tomografija. segmentation post-processing deviations three-dimensional reconstruction computed tomography. true true false [Š. Ekselenski Vuzem] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2021-12-05 10:36:13 2022-02-07 10:15:14 2022-09-03 03:06:53 0000-00-00 00:00:00 2022 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (X, 33 f.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 004.9:616-089.844(043.2) 120092675 MAG_Ekselenski_Vuzem_Spela_2022.pdf MAG_Ekselenski_Vuzem_Spela_2022.pdf 1 397C3D1E4EF323160043FC05752941E3 d9545f236caa53e770112480502b2152c7fc0f101a5b9c5ee008cc33a84b7336 79025be8-87f4-11ec-8783-00155d000105 20.500.12556/dkum/181e4634-3b30-447a-a469-e42c81c5a239 https://dk.um.si/Dokument.php?lang=slv&id=156426 Fakulteta za strojništvo 0 0 0