Detail publikace

Longitudinal Relaxation Time Measurement in MR with Transient-state Magnetization

GESCHEIDTOVÁ, E. BARTUŠEK, K.

Originální název

Longitudinal Relaxation Time Measurement in MR with Transient-state Magnetization

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

angličtina

Originální abstrakt

To measure the relaxation times T1 of polarized gases an unusual method has been proposed that makes use of the transient state of the magnetization of the nuclei being measured. The transient state is the result of multiple excitations by RF pulses with a small flip angle and an appropriate repetition time TR. The method was designed and experimentally tested for measuring the relaxation times T1 of polarized gases with transient-state magnetization, based on measuring the MR signal levels after the termination of RF pulses. For a higher precision of determining T1 two measurements with different repetition times were performed. The relaxation time was calculated from one or two measurements, using an optimization method. In the method described no precise calibration of the flip angle of RF pulses is necessary. The measuring precision achieved was better than 1%, and it depends on a precise determination of the magnitude of MR signal. The technique described will be used when measuring the properties of polarized gases or even liquids in porous materials.

Klíčová slova

Relaxation time, MR tomography, multiple excitation,

Autoři

GESCHEIDTOVÁ, E.; BARTUŠEK, K.

Rok RIV

2008

Vydáno

24. 3. 2008

Nakladatel

The Electromagnetic academy

Místo

Cambridge, USA

ISBN

978-1-934142-00-4

Kniha

PIERS 2008 Hangzhou

Strany od

591

Strany do

594

Strany počet

4

BibTex

@inproceedings{BUT26404,
  author="Eva {Gescheidtová} and Karel {Bartušek}",
  title="Longitudinal Relaxation Time Measurement in MR with Transient-state Magnetization",
  booktitle="PIERS 2008 Hangzhou",
  year="2008",
  pages="591--594",
  publisher="The Electromagnetic academy",
  address="Cambridge, USA",
  isbn="978-1-934142-00-4"
}