Sebastian Hirsch1,2 and Stefan Hetzer1,2
1Berlin Center for Advanced Neuroimaging, Charité - Universitätsmedizin Berlin, Berlin, Germany, 2Bernstein Center for Computational Neuroscience, Berlin, Germany
1Berlin Center for Advanced Neuroimaging, Charité - Universitätsmedizin Berlin, Berlin, Germany, 2Bernstein Center for Computational Neuroscience, Berlin, Germany
MRSequoia is introduced as a novel software tool to aid sequence developers in the design and validation of MR sequences. It operates on the timing produced by the scanner vendor’s sequence simulator and provides visualization, validation and export to MRiLab for spin physics simulations.
Visualization of one shot of the spin-echo sequence using MRSequoia’s built-in visualizer. Zooming and panning can be achieved with the two sliders or the buttons adjacent to it. In the table underneath, information about the sequence atoms at the position of the vertical blue line at the center of the plot is displayed.
Code to import the sequence timing from the Siemens IDEA simulator output and to perform a check that TR is consistent across all shots. The selector extracts all RF pulses (represented by class TXAtom) with a flip angle of 90°. The check then consists in verifying that the temporal spacing between subsequent pulses is constant. The output of the tests indicates that 129 such TX pulses were found (one dummy + 128 phase-encode shots), and that all of them are spaced 5 seconds apart, thus indicating success of the test.
