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FID‐based lung MRI at 0.5 T: Theoretical considerations and practical implications
Author(s) -
Schmidt Maria A.,
Yang GuangZhong,
Gatehouse Peter D.,
Firmin David N.
Publication year - 1998
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.1910390423
Subject(s) - pulsatile flow , distortion (music) , signal (programming language) , waveform , projection (relational algebra) , computer science , signal to noise ratio (imaging) , noise (video) , nuclear magnetic resonance , flip angle , lung , magnetic resonance imaging , artificial intelligence , physics , biomedical engineering , nuclear medicine , medicine , radiology , image (mathematics) , algorithm , telecommunications , amplifier , radar , bandwidth (computing) , programming language
Abstract Pulse sequences based on FID signals and projection reconstruction (PR) were investigated for lung MRI at 0.5 T and evaluated for artifacts caused by: (1) k‐space mismapping due to either delay or distortion of the readout gradient waveform, (2) cardiac motion and pulsatile flow, and (3) respiratory motion. Nonstructured artifacts were described, simulated, and experimentally confirmed for the first time. Nonstructured artifacts did not impair the demonstration of structures of high signal‐to‐noise ratio (SNR) but generated quantitative errors in the image intensity analysis over the lung parenchyma. The use of FID‐based PR techniques for lung MRI is not justified at 0.5 T.