Abstract
CAIPIRINHA-accelerated 2D bSSFP imaging with improved banding behavior using Gradient-Controlled Local Larmor Frequency (GC-LOLA)
Highlights
Cardiac MRI often requires a careful trade-off between SNR, spatio-temporal resolution and slice coverage
We propose a new method, called gradient-controlled local larmor adjustment (GC-LOLA), that eliminates the drawback of the RF-encoded combination in two steps: (1) By slightly unbalancing the slice select gradient, the Larmor frequency is made locally dependent, which compensates the relative shift between the pass-bands
(2) In addition, the RF phase cycles are modified to shift the centers of the aligned pass-bands to resonance
Summary
Cardiac MRI often requires a careful trade-off between SNR, spatio-temporal resolution and slice coverage. High SNR and flow/motion robustness, bSSFP has become the dominant sequence. Drawbacks are high SAR levels and sensitivity to B0 inhomogeneities. MSCAIPIRINHA [1] has emerged as a standard method. By simultaneously scanning multiple slices, it provides acceleration in slice direction with minimal SNR penalty. Two methods are available: The first [2] employs RFbased multi-slice encoding [1], generating slice-specific shifts in the bSSFP pass-band structure effectively reducing the off-resonance robustness by a factor of two. The second [3] applies balanced gradient encoding during readout, potentially increasing the sensitivity to eddy currents for small inter-slice distances because encoding changes from excitation to excitation
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