Rapid steady-state MR imaging and its clinical applications
Date Issued
2003-07-31
Date
2003-07-31
Author(s)
DOI
912213E002078
Abstract
Images acquired using the TrueFISP
technique (true Fast Imaging with
Steady-state Precession) are generally
believed to exhibit T2/T1-weighting. In this
project, it is demonstrated that with the
widely used half-flip-angle preparation
scheme, approaching the steady state requires
a time length comparable to the scan time
such that the transient-state response may
dominate the TrueFISP image contrast.
Two-dimensional images of the human brain
were obtained using various phase encoding
matrices to investigate the transient-state
signal behavior. Contrast between gray and
white matter was found to change
significantly from proton-density- to
T2/T1-weighted as the phase encoding
matrix size increased, which was in good
agreement with theoretical predictions. It is
concluded that TrueFISP images in general
exhibit T2/T1-contrast, but should be more
appropriately regarded as exhibiting a
transient-state combination of proton-density
and T2/T1 contrast under particular imaging
conditions. Interpretation of tissue
characteristics from TrueFISP images in
clinical practice thus needs to be exercised
with caution.
Subjects
TrueFISP
steady-state free
precession
precession
transient state
gray/white
matter contrast
matter contrast
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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