1. bSSFP Simulations
The goal of these simulations is to show the effect of noise on different pcSSFP reconstruction schemes
Further examine the uniformity of the max signal across the phase cycle curve with some flip angles
Look at the multi-component SSFP equation used in mcDESPOT to see how it handles band
The volume fraction is set to 1.0 so that the model should degrade to the single component one

2. bSSFP of 3T-WM
Dotted line shows reconstructed values with noise. Note that MIP is heavily affected by noise as expected. SOS and Complex Sum are comparable with a slight edge to Complex Sum.

3. bSSFP of 3T-WM

4. bSSFP of 3T-GM

5. bSSFP of 3T-GM

6. 3T DESPOT1
There were existing questions about the effect of HOS and ARC on T1 mapping
In a previous repeatability in vivo experiment between 2 days, there was somewhat poor control of HOS which may have affected the results
ARC images produced corrupted T1 maps compared to the fully sampled and ASSET
However this could have been caused by poor control of HOS (it was enabled on day 1 but not day 0) for the ARC scans
Recent DISCO experiments have shown that ARC images created with offline.recon produce corrupted maps
There was significant shading in the ARC images
Fundamentally doesn’t really make sense why ARC would be corrupted but not ASSET

7. Methods 3T2, scanned 4/1/2012 Agar sphere phantom 32ch NOVA coil
8ch also acquired but DICOMs missing
Acquired:
w/ Autoshim
Fully sampled, SPGR (up to 14 deg) and SSFP (up to 60 deg)
ARC2x1.5 SPGR and SSFP
w/ HOS
Fully sampled, SPGR and SSFP
ARC2x1.5, SPGR and SSFP
Bloch-Siegert maps are processed but need to be incorporated into fitting
Old fitting routines only allow DESPOT-HIFI, not arbitrary kappa map

8. T1 Map - Fully Sampled - Autoshim
0ms
1500ms

9. T1 Map - ARC2x1.5 - HOS
0ms
1500ms

10. T1 Map - ARC2x1.5 - Autoshim
0ms
1500ms

11. T1 Map - ARC2x1.5 - HOS
0ms
1500ms

12. Discussion Hard to say if there’s any additional shading added by ARC
Need to try to reconstruct from pfile with offline.recon to compare against the shown GE ARC reconstruction