Publication detail

Quality of gradient magnetic fields estimation

KUBÁSEK, R. GESCHEIDTOVÁ, E. BARTUŠEK, K.

Original Title

Quality of gradient magnetic fields estimation

English Title

Quality of gradient magnetic fields estimation

Type

journal article - other

Language

en

Original Abstract

Imaging techniques based on the principle of nuclear magnetic resonance (MRI) can be used in the study of molecular transport phenomena in biological systems such as self-diffusion processes. The precision of determining the diffusion constants depends on generating the gradient pulse with high precision. For the purpose of determining the characteristics of time behaviour of gradient pulses a simple measuring method was developed and experimentally tested on a 4.7 T tomograph. The method is based on the principle of measuring the instantaneous frequency of MR signal in the presence of gradient pulse after the excitation of a thin defined layer of the examined specimen placed outside the gradient field centre. Using the above method, errors were found in the amplitude and time integral of generated gradient fields and in determining the diffusion constants for biological tissues.

English abstract

Imaging techniques based on the principle of nuclear magnetic resonance (MRI) can be used in the study of molecular transport phenomena in biological systems such as self-diffusion processes. The precision of determining the diffusion constants depends on generating the gradient pulse with high precision. For the purpose of determining the characteristics of time behaviour of gradient pulses a simple measuring method was developed and experimentally tested on a 4.7 T tomograph. The method is based on the principle of measuring the instantaneous frequency of MR signal in the presence of gradient pulse after the excitation of a thin defined layer of the examined specimen placed outside the gradient field centre. Using the above method, errors were found in the amplitude and time integral of generated gradient fields and in determining the diffusion constants for biological tissues.

Keywords

MR, NMR, Gradient magnetic field mesurement

RIV year

2006

Released

20.12.2006

Pages from

54

Pages to

57

Pages count

4

BibTex


@article{BUT43663,
  author="Radek {Kubásek} and Eva {Gescheidtová} and Karel {Bartušek}",
  title="Quality of gradient magnetic fields estimation",
  annote="Imaging techniques based on the principle of nuclear magnetic resonance (MRI) can be used in the study of molecular transport phenomena in biological systems such as self-diffusion processes. The precision of determining the diffusion constants depends on generating the gradient pulse with high precision. For the purpose of determining the characteristics of time behaviour of gradient pulses a simple measuring method was developed and experimentally tested on a 4.7 T tomograph. The method is based on the principle of measuring the instantaneous frequency of MR signal in the presence of gradient pulse after the excitation of a thin defined layer of the examined specimen placed outside the gradient field centre. Using the above method, errors were found in the amplitude and time integral of generated gradient fields and in determining the diffusion constants for biological tissues.",
  chapter="43663",
  journal="Journal of Electrical Engineering
",
  number="8/S",
  volume="2006",
  year="2006",
  month="december",
  pages="54",
  type="journal article - other"
}