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Bachelor's Thesis
Author of thesis: Júlia Vlčanová
Acad. year: 2025/2026
Supervisor: Ing. Tomáš Jordánek
Reviewer: Ing. Martin Lamoš, Ph.D.
This bachelor's thesis addresses the preprocessing of electroencephalographic (EEG) signals recorded simultaneously with functional magnetic resonance imaging (fMRI) and the comparison of two independent component analysis methods for artefact reduction. A literature review covers the principles of simultaneous EEG-fMRI acquisition, the types of artefacts arising in the magnetic resonance (MR) environment, and available correction methods. Based on these findings, a preprocessing pipeline was designed and applied to data from 22 participants, comprising gradient and pulse artefact removal, manual annotation of motion artefacts, frequency filtering, and independent component analysis (ICA). The thesis presents a graphical user interface implemented in MATLAB App Designer, which integrates individual preprocessing steps, including both standard ICA and joint ICA, into a single controllable environment with support for batch processing of multiple subjects. Both methods were evaluated using spectral analysis and quantitative signal quality metrics: RMS (root mean square), maximum gradient, and signal-to-noise ratio (SNR), where EEG data acquired in a shielded cabin outside of the MR environment were used as a reference for data obtained in the MR environment. Joint ICA achieved statistically significantly better results than standard ICA for the data from the MR environment (p < 0.001): the RMS median decreased by 29.6%, the maximum gradient by 30.9%, and SNR improved by 36.6%, while biologically relevant alpha activity was preserved, indicating successful processing.
EEG, fMRI, simultaneous EEG-fMRI, artefacts, gradient artefact, ballistocardiogram artefact, EEG signal preprocessing, ICA, joint ICA, graphical user interface, MATLAB
Date of defence
16.06.2026
Result of the defence
Defended (thesis was successfully defended)
Grading
A
Process of defence
Student prezentoval výsledky své práce a komise byla seznámena s posudky. Ing. Jakubíčková položila otázku, proč byl pro řešení práce zvolen MATLAB namísto Pythonu, zda toto řešení nepřinášelo určitá omezení a zda je výsledná aplikace uživatelsky přívětivá. Doc. Kudrna položil otázku k použitým zdrojům a možnostem dalšího rozšíření práce. Ing. Smital položil otázku, v jakém úseku signálu jsou vyhledávány poškozené části signálu a z jakého časového úseku je počítáno výkonové spektrum. Student obhájil bakalářskou práci a odpověděl na otázky členů komise a oponenta.
Language of thesis
Slovak
Faculty
Fakulta elektrotechniky a komunikačních technologií
Department
Department of Biomedical Engineering
Study programme
Biomedical Technology and Bioinformatics (BPC-BTB)
Composition of Committee
doc. Ing. Petr Kudrna, Ph.D. (předseda) Ing. Markéta Jakubíčková, Ph.D. (místopředseda) MUDr. Zuzana Nováková, Ph.D. (člen) Ing. Lukáš Smital, Ph.D. (člen) Ing. Vratislav Harabiš, Ph.D. (člen) Ing. Larisa Chmelíková, Ph.D. (člen)
Supervisor’s reportIng. Tomáš Jordánek
Grade proposed by supervisor: A
Reviewer’s reportIng. Martin Lamoš, Ph.D.
Grade proposed by reviewer: A
Responsibility: Mgr. et Mgr. Hana Odstrčilová