Phase-Cycled SSFP Accelerated via DISCO May 31, 2012 Jason Su
Feb 15, 2016
Phase-Cycled SSFP Accelerated via DISCO
May 31, 2012Jason Su
Acquisition
• 7T• 4-phase cycled FIESTA• ASSET 2.5x• 330x94x250 (pfile matrix) acquired• 512x512x250 reconstructed
Processing
• Matlab retrospective application of DISCO on ASSET-reconstructed DICOM images
• Unfortunately couldn’t work from pfile due to offline.recon version incompatability
• 4x undersampled B region (across the 4 phase cycles)– Net accel. of 2.7x
Sum of Squares – Fully Sampled
Sum of Squares – 2.7x Accelerated
Sum of Squares – Percent Difference
Sum of Squares – Percent Difference
Phase 1 – Fully Sampled
Phase 1– 2.7x Accelerated
Phase 2 – Fully Sampled
Phase 2 – 2.7x Accelerated
Phase 3 – Fully Sampled
Phase 3 – 2.7x Accelerated
Phase 4 – Fully Sampled
Phase 4 – 2.7x Accelerated
Conclusions
• There is a “loss” of some of the bands in the individual phase images– But the net result in the SOS combination looks
more or less like a loss of SNR• Usually DISCO is done on a per coil channel
basis, this may have an effect on the result– Here it was done just on the reconstructed
magnitude image