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Zaznavanje anomalij v EPT MRI slikah možganov fantomov
ID Golob, Ožbej (Author), ID Sadikov, Aleksander (Mentor) More about this mentor... This link opens in a new window

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Abstract
Standardni MRI podatki so večinoma kvalitativne narave (prikazujejo kontrast med različnimi tkivi). Tomografija električnih lastnosti (EPT MRI) je kvantitativna tehnika, kar pomeni, da za vsako slikovno točko prikaže konkretno vrednost. V diplomskem delu smo raziskali področje EPT MRI ter ugotovili, da je s pomočjo strojnega učenja na EPT MRI slikah možno zaznati prisotnost anomalije. Kot vhodne podatke smo uporabili EPT MRI slike možganov fantomov. V sklopu diplomskega dela smo napisali dve različici algoritma za zaznavanje anomalij. Klasičen pristop za zaznavanje anomalij v beli snovi zazna območja, ki jih ločujejo robovi, nato pa na podlagi srednje vrednosti električne prevodnosti območij določi, katera območja predstavljajo anomalijo. S klasičnim pristopom smo zaznali anomalije, ki so približne velikosti kocke z robovi, dolgimi 14 mm. Druga različica algoritma izkoristi kvantitativne karakteristike EPT MRI in anomalije zaznava preko absolutnih vrednosti električne prevodnosti. Preko absolutnih vrednosti smo zaznali anomalije, ki so približne velikosti kocke z robovi, dolgimi 12 mm.

Language:Slovenian
Keywords:MRI, EPT MRI, strojno učenje, zaznavanje anomalij
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FRI - Faculty of Computer and Information Science
Year:2021
PID:20.500.12556/RUL-129660 This link opens in a new window
COBISS.SI-ID:75999747 This link opens in a new window
Publication date in RUL:06.09.2021
Views:1555
Downloads:126
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Secondary language

Language:English
Title:Anomaly detection in EPT MRI brain images of phantoms
Abstract:
Standard MRI data is mostly in a qualitative form (showing the contrast between different tissues). Electrical properties tomography (EPT MRI) is a quantitative technique, which means that it shows a specific value for each voxel. In this thesis we researched the field of EPT MRI and found that machine learning can be used to detect the presence of an anomaly in EPT MRI images. EPT MRI brain images of phantoms were used as input data. As part of the thesis, we wrote two versions of the anomaly detection algorithm. The classical approach for anomaly detection detects regions, separated by edges in white matter, and then determines which regions are an anomaly, based on the mean value of the electric conductivity. The classical approach has detected anomalies that are approximately the size of a cube with 14 mm long edges. The second version of the algorithm exploits the quantitative characteristics of EPT MRI and detects anomalies through absolute values of electrical conductivity. We have detected anomalies that are approximately the size of a cube with 12 mm long edges via absolute values.

Keywords:MRI, EPT MRI, machine learning, anomaly detection

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