phase-cycled ssfp accelerated via disco

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