Flow-independent subtractive non-contrast enhanced MRA using flow insensitive and sensitive SSFP-echo
Michael C Langham 1 , Cheng Li 1 , and Felix Wehrli 1
Radiology, University of Pennsylvania,
Philadelphia, Pennsylvania, United States
We demonstrate a new subtractive flow-independent
non-contrast MRA using flow insensitive and sensitive
SSFP-echo signal. The balanced SSFP spectral signal can
be sampled by acquiring multiple data sets with
different linear phase increments. The 1D Fourier
transform of the phase-cycled data sets resolves the
modes of the SSFP normally coalesced in a bSSFP pulse
sequence, including the desired flow-insensitive SSFP-echo.
On the other hand, unbalanced SSFP pulse sequence can be
used to isolate flow-sensitive SSFP-echo signal.
Subtraction removes the muscle tissue and lipid signals
whereas contrast between arterial and venous blood is
maximized by exploiting arterial bloods longer T2.
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