Rekonstrukcijski algoritmi u računalnoj tomografiji

master's thesis

• Title (english): Reconstruction algorithms in computed tomography
• Author: Dora Gadžić
• Mentor: Marko Katić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2022-05-12, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Precision Mechanical Engineering

Abstract

Računalna tomografija jedna je od metoda nerazornih ispitivanja koje se temelji na prikupljanju dvodimenzionalnih projekcija mjernog objekta prilikom rotacije istog oko osi. U računalnom sustavu CT uređaja prikupljaju se mjerni podatci, te se pomoću rekonstrukcijskih algoritama provodi rekonstrukcija trodimenzionalnog volumena. U okviru ovog radu stavlja se naglasak upravo na „open-source“ rekonstrukcijske algoritme, čija je primjenjivost ispitana na realnim podacima izmjerenima na CT uređaju u Laboratoriju za precizna mjerenja dužina pri Fakultetu strojarstva i brodogradnje Sveučilišta u Zagrebu.
U prvom, uvodnom poglavlju dan je opći pregled računalne tomografije i rekonstrukcijskih algoritama. U drugom poglavlju detaljnije je objašnjena matematička podloga na kojoj počivaju rekonstrukcijski algoritmi. Također je izvršena analiza učinkovitosti svakog algoritma pojedinačno i zatim je prikazana je usporedba istih. U trećem poglavlju opisan je „open-source“ računalni alat ASTRA Toolbox i dan je uvid u sintaksu potrebnu za rekonstrukciju dvodimenzionalnog i trodimenzionalnog prikaza pomoću dostupnih rekonstrukcijskih algoritama. Četvrto poglavlje sadrži rezultate rekonstrukcija i osvrt na iste, utemeljen na usporedbi rezultata, te osvrt na primjenjivost „open-source“ algoritama u ASTRA Toolbox alatu na realne podatke. Posljednje, peto poglavlje donosi zaključak donesen na temelju rezultata iz četvrtog poglavlja.

Abstract (english)

Computed tomography is the non-destructive testing method based on the collection of two-dimensional projections of the measuring object during its rotation around the axis. In the computer system of CT devices, measured data are collected, and the reconstruction of three-dimensional volume is performed using reconstruction algorithms. The emphasis of this thesis is put on the open-source reconstruction algorithms, whose applicability was performed on real data, measured on a CT device in the Laboratory for Precise Length Measurements at the Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb.
In the first, introductory chapter a general overview of the of computed tomography and reconstruction algorithms is given. The second chapter outlines detailed mathematical model on which the reconstruction algorithms are based. An analysis of each algorithm efficiency was performed as well, and afterwards, comparison was presented. In the third chapter, open-source ASTRA Toolbox was presented and insight into the syntax required for the reconstruction of two-dimensional and three-dimensional view using available reconstruction algorithms is given. Chapter four contains the reconstruction results and their interpretation based on the comparison of results, but also insight into ASTRA Toolbox open-source reconstruction algorithms applicability to real data. Finally, the fifth chapter gives a conclusion based on the results presented in the fourth chapter.

• Keywords: računalna tomografija; rekonstrukcijski algoritmi; 3D rekonstrukcija; povratna projekcija; ASTRA Toolbox
• Keywords (english): computed tomography; reconstruction algorithms; 3D reconstruction; back projection; ASTRA Toolbox
• Language: croatian
• URN:NBN: urn:nbn:hr:235:367675
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-05-09 10:58:16