phase-cycled ssfp accelerated via disco
DESCRIPTION
Phase-Cycled SSFP Accelerated via DISCO. May 31, 2012 Jason 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 - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Phase-Cycled SSFP Accelerated via DISCO](https://reader035.vdocuments.site/reader035/viewer/2022062520/56815ed1550346895dcd6218/html5/thumbnails/1.jpg)
Phase-Cycled SSFP Accelerated via DISCO
May 31, 2012Jason Su
![Page 2: Phase-Cycled SSFP Accelerated via DISCO](https://reader035.vdocuments.site/reader035/viewer/2022062520/56815ed1550346895dcd6218/html5/thumbnails/2.jpg)
Acquisition
• 7T• 4-phase cycled FIESTA• ASSET 2.5x• 330x94x250 (pfile matrix) acquired• 512x512x250 reconstructed
![Page 3: Phase-Cycled SSFP Accelerated via DISCO](https://reader035.vdocuments.site/reader035/viewer/2022062520/56815ed1550346895dcd6218/html5/thumbnails/3.jpg)
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
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Sum of Squares – Fully Sampled
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Sum of Squares – 2.7x Accelerated
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Sum of Squares – Percent Difference
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Sum of Squares – Percent Difference
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Phase 1 – Fully Sampled
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Phase 1– 2.7x Accelerated
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Phase 2 – Fully Sampled
![Page 11: Phase-Cycled SSFP Accelerated via DISCO](https://reader035.vdocuments.site/reader035/viewer/2022062520/56815ed1550346895dcd6218/html5/thumbnails/11.jpg)
Phase 2 – 2.7x Accelerated
![Page 12: Phase-Cycled SSFP Accelerated via DISCO](https://reader035.vdocuments.site/reader035/viewer/2022062520/56815ed1550346895dcd6218/html5/thumbnails/12.jpg)
Phase 3 – Fully Sampled
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Phase 3 – 2.7x Accelerated
![Page 14: Phase-Cycled SSFP Accelerated via DISCO](https://reader035.vdocuments.site/reader035/viewer/2022062520/56815ed1550346895dcd6218/html5/thumbnails/14.jpg)
Phase 4 – Fully Sampled
![Page 15: Phase-Cycled SSFP Accelerated via DISCO](https://reader035.vdocuments.site/reader035/viewer/2022062520/56815ed1550346895dcd6218/html5/thumbnails/15.jpg)
Phase 4 – 2.7x Accelerated
![Page 16: Phase-Cycled SSFP Accelerated via DISCO](https://reader035.vdocuments.site/reader035/viewer/2022062520/56815ed1550346895dcd6218/html5/thumbnails/16.jpg)
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