Title :
The influence of motion on T1/T2 from cardiac-type phase-encoding direction
Author :
Liu, Shinshang ; Bohning, Daryl E. ; Carter, Bruce ; McCutcheon, Martin J. ; Pohost, Gerald M.
Author_Institution :
Dept. of Biomed. Eng., Alabama Univ., Birmingham, AL, USA
Abstract :
The authors report on a study to determine the effect of cardiac-type motion in the phase-encoding direction on the determination of T1/T2, th ratio of the tissue relaxation times, from multiecho spin-echo and inversion recovery nuclear magnetic resonance (NMR) data, with and without triggering. A motion phantom was designed to imitate the speed of heart wall motion. The phantom was also lined with material to simulate myocardial T 1/T2. It was found that neither oscillatory motion in the phase-encoding direction nor frequency variations significantly affect measurements of T1 and T2 as long as multiple data points are used and partial volumes with blood or other tissues are avoided
Keywords :
biomedical NMR; cardiology; nuclear spin-lattice relaxation; patient diagnosis; spin-spin relaxation; T1/T2; cardiac-type phase-encoding direction; frequency variations; heart wall motion speed; inversion recovery nuclear magnetic resonance; motion phantom; multiecho spin-echo nuclear magnetic resonance; oscillatory motion; partial volume; tissue relaxation time; Biological materials; Frequency measurement; Heart; Imaging phantoms; Magnetic materials; Motion measurement; Myocardium; Nuclear magnetic resonance; Phase measurement; Volume measurement;
Conference_Titel :
Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in
Conference_Location :
Seattle, WA
DOI :
10.1109/IEMBS.1989.95890
