Small flip-angle spokes with SAR constraints

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Citation

Guérin B, Gebhardt M, Cauley S, Adalsteinsson E, Wald LL (2014). "Local specific absorption rate (SAR), global SAR, transmitter power, and excitation accuracy trade‐offs in low flip‐angle parallel transmit pulse design." Magnetic Resonance in Medicine 71(4): 1446-1457.

What this code does

This Matlab code (no MEX, no GPU code) computes least-squares and magnitude least-squares pTx spoke pulses. The MLS problem can be solved using the phase adoption approach of Setsompop et al. or a full optimization strategy (see the file spokes_3/run_spokes.m and options therein). Spokes can be optimized for several frequencies (spatio-spectral design) in order to build in robustness to off-resonance effects.

Download files

The code can be downloaded here. A test dataset can be downloaded here.

Instructions

Unzip the code folder and add it to your path. Unzip the data folder and run the script run_spokes.m. There are several options in it that are straightforward to understand. Most of the spoke options (such as slice-thickness, slice-selection gradient, time-bandwidth product etc...) are specified in the text file spokes_def.txt and can be changed there.