Název:
Correction of gradient pulse shape distortions in radial MRI
Autoři:
Vitouš, Jiří Typ dokumentu: Příspěvky z konference Konference/Akce: STUDENT EEICT 2022 /28./, Brno (CZ), 20220426
Rok:
2022
Jazyk:
eng
Abstrakt: 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.
Klíčová slova:
adjustment; gradient; MRI; Nelder–Mead; slice Číslo projektu: LM2018129 (CEP), EF18_046/0016045, GA22-10953S (CEP) Poskytovatel projektu: GA MŠk, GA MŠk, GA ČR Zdrojový dokument: Proceedings II of the 28th Conference STUDENT EEICT 2022. Selected Papers, ISBN 978-80-214-6030-0, ISSN 2788-1334