Abstract #2402
Steady-state imaging with 3D inner volume excitation
Hao Sun 1 , Jeffrey A. Fessler 1 , Douglas C. Noll 2 , and Jon-Fredrik Nielsen 2
1
Electrical Engineering and Computer Science,
University of Michigan, Ann Arbor, Michigan, United
States,
2
Biomedical
Engineering, University of Michigan, Ann Arbor,
Michigan, United States
Steady-state gradient echo sequences are generally not
suitable for reduced field of view (rFOV) imaging using
3D tailored excitation pulses, due to the long duration
of conventional 3D RF pulses. Recently, a method for
joint RF pulse and continuous k-space trajectory design
was proposed that produces tailored RF pulses capable of
exciting a non-smooth 3D pattern even with a single RF
coil and short pulse duration (e.g., 4 ms). However, it
is unknown whether this RF pulse is sufficiently
accurate for rFOV steady-state imaging since even small
residual flip angles outside the rFOV can lead to
relatively large steady-state signal. In this work, we
evaluate using the joint RF pulse design method in for
Inner Volume excitation (IVex) in three steady state
sequences: RF-spoiled gradient echo (SPGR), balanced
SSFP (bSSFP), and the recently proposed Small-Tip Fast
Recovery (STFR) sequence. STFR can produce similar
tissue signal and contrast as bSSFP, however we
hypothesized that the outer-volume signal for IVex-STFR
and IVex-bSSFP may differ.
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