Diffusion MRI: Mitigation of Magnetic Field Inhomogeneities

0385190 - ÚPT 2013 RIV SK eng J - Journal Article
Marcon, P. - Bartušek, Karel - Dokoupil, Zdeněk - Gescheidtová, E.
Diffusion MRI: Mitigation of Magnetic Field Inhomogeneities.
Measurement Science Review. Roč. 12, č. 5 (2012), s. 205-212. ISSN 1335-8871. E-ISSN 1335-8871
R&D Projects: GA MŠMT ED0017/01/01; GA ČR GAP102/11/0318; GA ČR GAP102/12/1104
Institutional support: RVO:68081731
Keywords : correction * diffusion * inhomogeneity * eddy currents * magnetic resonance
Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering
Impact factor: 1.233, year: 2012

The article reports on certain artifacts that emerge during the in vitro diffusion-weighted imaging of physical samples. In this context, the authors analyze the influence of magnetic field inhomogeneity, temperature, or eddy currents and consider artifact mitigation procedures. A technique reducing the examined spurious effects was designed, experimentally verified, and denominated as the three measurement method. The technique proved to be useful mainly for the evaluation of a DWI image measured with a diffusion gradient in the z axis, where the relative measurement error decreased to 3.38 % (during measurement using two images, the relative error was greater than 19 %). For small errors within the measurement of diffusion constants of a deionized water sample (< 5 %) it was necessary to select a b-factor value larger than 200·106 s.m-2. Temperature stabilization with accuracy better than 0.1 °C during the entire measuring process is a necessary prerequisite for the measurement of biological or material samples with relative accuracy lower than 1 %.
Permanent Link: http://hdl.handle.net/11104/0214525