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Resolution enhanced T 1 ‐insensitive steady‐state imaging
Author(s) -
Derakhshan Jamal J.,
Nour Sherif G.,
Sunshine Jeffrey L.,
Griswold Mark A.,
Duerk Jeffrey L.
Publication year - 2012
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.23290
Subject(s) - steady state free precession imaging , image resolution , nuclear magnetic resonance , physics , adiabatic process , imaging phantom , flip angle , optics , magnetic resonance imaging , medicine , radiology , thermodynamics
Abstract Resolution enhanced T 1 ‐insensitive steady‐state imaging (RE‐TOSSI) is a new MRI pulse sequence for the generation of rapid T 2 contrast with high spatial resolution. TOSSI provides T 2 contrast by using nonequally spaced inversion pulses throughout a balanced steady‐state free precession (SSFP) acquisition. In RE‐TOSSI, these energy and time intensive adiabatic inversion pulses and associated magnetization preparation are removed from TOSSI after acquisition of the data around the center of k ‐space. Magnetization evolution simulations demonstrate T 2 contrast in TOSSI as well as reduction in the widening of the point spread function width (by up to a factor of 4) to a near ideal case for RE‐TOSSI. Phantom experimentation is used to characterize and compare the contrast and spatial resolution properties of TOSSI, RE‐TOSSI, balanced SSFP, Half‐Fourier Acquisition Single‐Shot Turbo Spin Echo (HASTE), and turbo spin echo and to optimize the fraction of k ‐space acquired using TOSSI. Comparison images in the abdomen and brain demonstrate similar contrast and improved spatial resolution in RE‐TOSSI compared with TOSSI; comparison balanced SSFP, HASTE, and turbo spin echo images are provided. RE‐TOSSI is capable of providing high spatial resolution T 2 ‐weighted images in 1 s or less per image. Magn Reson Med, 2012. © 2011 Wiley Periodicals, Inc.