Publication detail

Diffusion MRI: magnetic field inhomogeneities mitigation

MARCOŇ, P. BARTUŠEK, K. GESCHEIDTOVÁ, E. DOKOUPIL, Z.

Original Title

Diffusion MRI: magnetic field inhomogeneities mitigation

English Title

Diffusion MRI: magnetic field inhomogeneities mitigation

Type

journal article - other

Language

en

Original Abstract

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 procedures to mitigation of the artifacts. A technique reducing the examined spurious effects was designed, experimentally verified, and denominated as the three measurements 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 deionised water sample (<5%) it is necessary to select a b-factor value larger than 200x10^6 s.m-2. Temperature stabilisation with an accuracy better than 0.1 degree of celsius during the entire measuring process is a necessary prerequisite for the measurement of biological or material samples with a relative accuracy lower than 1%.

English abstract

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 procedures to mitigation of the artifacts. A technique reducing the examined spurious effects was designed, experimentally verified, and denominated as the three measurements 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 deionised water sample (<5%) it is necessary to select a b-factor value larger than 200x10^6 s.m-2. Temperature stabilisation with an accuracy better than 0.1 degree of celsius during the entire measuring process is a necessary prerequisite for the measurement of biological or material samples with a relative accuracy lower than 1%.

Keywords

correction, diffusion, inhomogeneity, eddy currents, magnetic resonance

RIV year

2012

Released

17.09.2012

Publisher

Versita Open, Versita Ltd. London

Location

London, Great Britain

Pages from

205

Pages to

212

Pages count

8

URL

BibTex


@article{BUT93943,
  author="Petr {Marcoň} and Karel {Bartušek} and Eva {Gescheidtová} and Zdeněk {Dokoupil}",
  title="Diffusion MRI: magnetic field inhomogeneities mitigation",
  annote="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 procedures to mitigation of the artifacts. A technique reducing the examined spurious effects was designed, experimentally verified, and denominated as the three measurements 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 deionised water sample (<5%) it is necessary to select a b-factor value larger than 200x10^6 s.m-2. Temperature stabilisation with an accuracy better than 0.1 degree of celsius during the entire measuring process is a necessary prerequisite for the measurement of biological or material samples with a relative accuracy lower than 1%.",
  address="Versita Open, Versita Ltd. London",
  chapter="93943",
  institution="Versita Open, Versita Ltd. London",
  number="5",
  volume="12",
  year="2012",
  month="september",
  pages="205--212",
  publisher="Versita Open, Versita Ltd. London",
  type="journal article - other"
}