Rapid steady-state MR imaging and its clinical applications (2/2)
Date Issued
2004-07-31
Date
2004-07-31
Author(s)
DOI
922218E002017
Abstract
The feasibility of fat/water separation using
the balanced steady-state free precession (SSFP)
technique is demonstrated. The key idea is
based on the observation that at the nominal
values of TE = TR/2 in SSFP imaging, phase
coherence could be achieved at essentially only
two orientations, namely 00 and 1800 relative to
the RF pulses in the rotating frame, under the
assumption of TR << T2 and independent of the
steady-state free precession angle. This
property allows in-phase and out-of-phase SSFP
images to be obtained by proper choices of the
center frequency offset, hence permitting the
Dixon subtraction method to be utilized for
effective fat/water separation. The TR and
frequency offset for optimal fat/water separation
are derived from theories. Experimental results
on healthy subjects using a 3.0 Tesla system
show that nearly complete fat suppression can be
accomplished.
Subjects
Fat-water separation
Dixon method
in-phase out-of-phase images
steady-state free
precession
precession
Publisher
臺北市：國立臺灣大學電機工程學系暨研究所
Type
report
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