Abstract
Purpose To implement a 5D (three spatial + two spectral) correlated spectroscopic imaging sequence for application to human calf. Theory and Methods Nonuniform sampling was applied across the two phase encoded dimensions and the indirect spectral dimension of an echo planar-correlated spectroscopic imaging sequence. Reconstruction was applied that minimized the group sparse mixed l 2,1-norm of the data. Multichannel data were compressed using a sensitivity map-based approach with a spatially dependent transform matrix and utilized the self-sparsity of the individual coil images to simplify the reconstruction. Results Single channel data with 8× and 16× undersampling are shown in the calf of a diabetic patient. A 15-channel scan with 12× undersampling of a healthy volunteer was reconstructed using 5 virtual channels and compared to a fully sampled single slice scan. Group sparse reconstruction faithfully reconstructs the lipid cross peaks much better than l 1 minimization. Conclusion COSY spectra can be acquired over a 3D spatial volume with scan time under 15 min using echo planar readout with highly undersampled data and group sparse reconstruction. Magn Reson Med 74:1199-1208, 2015.
Original language | English (US) |
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Pages (from-to) | 1199-1208 |
Number of pages | 10 |
Journal | Magnetic resonance in medicine |
Volume | 74 |
Issue number | 5 |
DOIs | |
State | Published - Nov 2015 |
Externally published | Yes |
Keywords
- 3D spectroscopic imaging
- EP-COSI
- calf muscle
- compressed sensing
- group sparsity
- nonuniform sampling
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging