2008 IGT Project Week Fast Imaging Library

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Team: Scott Hoge, Bob Kraft

Goals: Further integrate algorithms from the Fast Imaging Library (doc here: http://www.spl.harvard.edu/publications/item/view/1393) to enable interactive EPI measurements for perfusion, fMRI, and temperature monitoring using accelerated and efficient EPI-based MR acquisitions

Approach:

• complete a mechanism to maintain the phase in our pMRI-UNFOLD-EPI-PROPELLER acquisition technique, which is required for both temperature change estimation and EPI distortion correction
• incorporate real-time hooks into EPI sequence, to provide interactive acquisitions
• start investigations into radial EPI

Other Notes:

• This team will spend significant time on the MR scanner. Schedule here: http://calendar.yahoo.com/YYY,5107b4/srt,0/lmrc_ms_scanner/?v=2&t=1228608000

Results (to be completed and presented at the end of the week):

• extended accelerate short axis propeller epi to use partial Fourier
  • issues w/ recon pending due to susceptibility distortion from blade to blade
• implemented both double-sampled and 'racetrack' trajectory in epi psd, to collect self-ref data for b0 field map estimation
  • able to calculate relative phase changes using racetrack reference data
  • may be incompatible with unfold nyquist ghost removal method
• wfu epi psd updated to 3d
• modified fgre to use modular rthawk implementation
• rt epi not accomplished, due to difficulty getting rthawk to run on scanner

Fig 1 from Roopchansingh MRM 50:839, 2003