Correction of gradient pulse shape distortions in radial MRI

0568842 - ÚPT 2023 RIV CZ eng C - Conference Paper (international conference)
Vitouš, Jiří
Correction of gradient pulse shape distortions in radial MRI.
Proceedings II of the 28th Conference STUDENT EEICT 2022. Selected Papers. Brno: Brno University of Technology, Faculty of Electrical Engineering and Communication, 2022 - (Novák, V.), s. 264-268. ISBN 978-80-214-6030-0. ISSN 2788-1334.
[STUDENT EEICT 2022 /28./. Brno (CZ), 26.04.2022-26.04.2022]
R&D Projects: GA MŠMT(CZ) LM2018129; GA MŠMT(CZ) EF18_046/0016045; GA ČR(CZ) GA22-10953S
Institutional support: RVO:68081731
Keywords : MRI * gradient * Nelder–Mead * slice * adjustment
OECD category: Medical engineering
https://www.eeict.cz/eeict_download/archiv/sborniky/EEICT_2022_sbornik_2_v3.pdf

This paper focuses on the optimization of gradient-pulse shapes in MRI measurement. The main topic investigated in this paper is optimization of slice-selective gradient, where imperfections may produce phase distortion in the resulting image and also signal loss in the acquired signal. A method for correction is proposed based on the Nelder-Mead algorithm followed by coordinate ascent search in the neighborhood of the found solution. The adjustment is evaluated using a simple Fast low angle shot (FLASH) sequence with radial readout. The results show a significant improvement in the Free induction decay (FID) signal magnitude, echo stability, and an improvement in the homogeneity of image phase.
Permanent Link: https://hdl.handle.net/11104/0340112