I am an assistant professor of Biomedical Engineering at Vanderbilt University.
My group and I perform our research at the Vanderbilt University Institute of Imaging Science (VUIIS).
2/10/2014 Our group's accepted ISMRM 2014 abstracts:
- Z Cao et al: Frequency encoding by Bloch-Siegert shift. Accepted for e-poster presentation in session 'Pulse Sequences & Constrast Mechanisms'
- P Gaur et al: Temperature map reconstruction directly from k-space with compensation for heating-induced geometric distortions. pdf link. Accepted for traditional poster presentation in session 'Thermotherapy & Thermometry.'
- P Gaur et al: Comparison of single- and multi-echo PRF-shift thermometry and method for penalized-likelihood multi-echo temperature reconstruction. pdf link. Accepted for traditional poster presentation in session 'Thermotherapy & Thermometry.'
- J Ianni et al: k-SPIRiT: Non-Cartesian SPIRiT image reconstruction with automatic trajectory error compensation. pdf link. Accepted for Power Poster presentation in session 'Powerful Acquisition & Recon Techniques.'
- A Sharma et al: SALSAS: Spectral-spatial excitation combined with z-shimming to mitigate through-plane signal loss in single-slice and multiband gradient echo imaging. Accepted for traditional poster presentation in session 'Acquisition Methods.'
We are currently looking for a postdoc to work in MR-guided HIFU! More information here (pdf link).
Some publications (Pubmed)
- RF pulse design for MRI, particularly parallel excitation
- MRI for guided interventions
- Fast algorithms
- Inverse problems
Please note that you will need Jeff Fessler's Medical Image Reconstruction
Toolbox in your path, in order to run most of this software. This can be
obtained from his website.
- ptx_test.tar.gz: MATLAB objects and examples of fast small- and large-tip-angle RF pulse design (parallel and single-channel). From this paper (Pubmed link) and this abstract (PDF link) and this paper (IEEE Xplore PDF link).
- maxphase_spsp_test.tar.gz: Example of maximum linear-phase spectral-spatial RF pulse design, developed to suppress fat in a long-TE/short-TR GRE sequence for thermometry. This package will also require John Pauly's RF design tools (rsl.stanford.edu). From this paper (Pubmed link).
- blochsim_cuda.zip: Crude mex+CUDA implementation of a multidimensional Bloch equation simulator for RF excitation. Hopefully some will find this useful as a starting point for a more robust MATLAB-callable CUDA-based Bloch simulator.
- rwtl1thermo.zip: Reweighted-l1 referenceless PRF-shift temperature estimation. From this paper (doi link).
- hybridthermo.zip: Hybrid
multibaseline and referenceless PRF-shift temperature
estimation. From this
paper (doi link).
- optimalcontrol.zip: Spin-domain
optimal control RF pulse design code. Based on the hard pulse
approximation. Included are multithreaded (pthreads) mex functions for bloch simulations and
- nuslr.zip: Nonuniform and multidimensional Shinnar-Le Roux RF pulse design, from this paper (doi link). Two examples are included: a spiral in-out refocusing pulse and a fat-suppressing spectral-spatial refocusing pulse for 3T. MATLAB's Parallel Computing Toolbox is used to implement two CUDA kernels, so you need both that toolbox and a CUDA-enabled NVIDIA GPU to use the software. The package will also require John Pauly's RF design tools (rsl.stanford.edu).
- Optimized Bloch-Siegert Encoding Pulse Library: From this abstract (pdf link). These pulses are a dramatic improvement over conventional pulses (e.g. Fermi) used in Bloch-Siegert B1 mapping, due to their short duration (so you get a shorter TE and lower SAR for the same sensitivity), and have a much wider operating bandwidth. Two .zip files are in that directory, containing pulses sampled on 6.4us and 10us grids. We've also included phase difference-to-|B1+| lookup tables and example MATLAB scripts and data to do the lookup. This is the work of Marcin Jankiewicz.
- b1plusslr.zip: MATLAB scripts to design B1+-selective excitation pulses using the Shinnar-Le Roux algorithm. The package will also require John Pauly's RF design tools (rsl.stanford.edu).
- kspacedemo.zip: MATLAB scripts and data to demo reconstruction of temperature maps from undersampled k-space data using k-space hybrid thermometry. From this manuscript.
Native Client SLR Pulse Design Tool
William Grissom (will DOT grissom AT vanderbilt DOT edu)