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Effects of slice selection and diffusion on T 2 measurement
Author(s) -
Wong S. T. S.,
Roos M. S.
Publication year - 1987
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.1910050407
Subject(s) - echo (communications protocol) , multislice , diffusion , selection (genetic algorithm) , wafer , nuclear magnetic resonance , spin echo , data set , echo planar imaging , physics , computer science , materials science , artificial intelligence , magnetic resonance imaging , medicine , computer network , optoelectronics , radiology , thermodynamics
This study examines slice selection and diffusion as sources of systematic error in T 2 estimates obtained from imaging experiments. The selective refocusing pulses in a multislice, two‐echo, spin‐warp experiment cause slice profiles of sequential echoes to change in shape. This results in bias in T 2 images calculated from the two‐echo data set. A method to correct the bias is presented. The effect of diffusion on T 2 images obtained with typical two‐echo imaging sequences was found to be negligible. © 1987 Academic Press, Inc.
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