2010 Winter Project Week Fast Imaging Library + Siemens EPI

Key Investigators

• BWH: Scott Hoge
• Utah: Nick Todd, Dennis Parker

Objective

Incorporate improved EPI Nyquist ghost correction techniques and on-line parallel imaging reconstruction modules into the multi-shot EPI sequence used by the HiFU project at Utah.

Approach, Plan

Our plan for the project week is to ...

• modify the multi-shot EPI sequence to include temporal encoding
• integrate fast imaging library calls into ICE image reconstruction chain

Progress

• Temporal encoding of single-shot EPI complete. extending to segmented EPI sequence.
• Functor created to reconstruct acquired data in Siemens ICE framework
• Modified Functor Makefiles to link in NCIGT Fast Imaging Library

Progress

• On Acquisition
  • Single-shot EPI pulse sequence modified to include temporal encoding.
  • Data acquired on Siemens machine
  • Images reconstructed using EPI-GESTE show very low Nyquist ghosts, much lower than the product reconstruction code

• • Double-shot EPI pulse sequence modified to include temporal encoding
  • PLACE method to remove ghosts works (but with loss of temporal resolution), EPI-GESTE still needs some work.

• On Reconstruction
  • EPI-GESTE Functor defined for Siemens ICE processing chain
  • NCIGT Fast Imaging library linked into functor
  • currently debugging the functor

Background

• We have a new method for self-referenced EPI ghost correction (EPI-GESTE)
• Goal for the week: implement on Siemens, both pulse sequence changes and on-line recon
  • temporal encoding of EPI data acquisition
  • application of parallel imaging algorithms

References

• Fast Imaging Library