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Abstract:
Three-dimensional TrueFISP: The TrueFISP sequence
as proposed by Oppelt et al. in 1986 offers a
high contrast between myocardium and intraventricular
cavity, which is desirable for accurate assessment of
ventricular function. A significant drawback of True-
FISP is its sensitivity to off-resonance effects caused by
an imperfect shim, chemical shifts, eddy currents, and
Maxwell effects. An extension of the two-dimensional
TrueFISP sequence to an ECG gated three-dimensional
TrueFISP sequence is thus not straight forward and
requires a very carefully designed acquisition scheme.
The current implementation of our gated three-dimensional
TrueFISP sequence allows to acquire the complete
heart in its diastolic phase within about 20
heartbeats with a resolution of 2 x 2 x 3 mm. In addition,
a three-dimensional TrueFISP cine technique with
a time resolution of 80 ms and a spatial resolution of
3 x 4 x 4 mm was implemented.
hTcersion recoveo" TrueFISP: Two-dimensional inversion
recovery TrueFISP is a new method for T1 quantification
of the myocard within several heartbeats. The
intrinsically T~ weighted FLASH readout module was
replaced by a TrueFISP readout module to continuously
acquire the recovery of longitudinal magnetization
alter inversion or saturation. Quantitative T~
measurements on phantoms and on humans based on
FLASH and TrueFISP were compared to the gold standard of separately acquired TI measurements. Applications of IR TrueFISP may include quantitative assessment of myocard damage after CA administration.
