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- Title
Dictionary learning compressed sensing reconstruction: pilot validation of accelerated echo planar J-resolved spectroscopic imaging in prostate cancer.
- Authors
Joy, Ajin; Nagarajan, Rajakumar; Saucedo, Andres; Iqbal, Zohaib; Sarma, Manoj K.; Wilson, Neil; Felker, Ely; Reiter, Robert E.; Raman, Steven S.; Thomas, M. Albert
- Abstract
Objectives: This study aimed at developing dictionary learning (DL) based compressed sensing (CS) reconstruction for randomly undersampled five-dimensional (5D) MR Spectroscopic Imaging (3D spatial + 2D spectral) data acquired in prostate cancer patients and healthy controls, and test its feasibility at 8x and 12x undersampling factors. Materials and methods: Prospectively undersampled 5D echo-planar J-resolved spectroscopic imaging (EP-JRESI) data were acquired in nine prostate cancer (PCa) patients and three healthy males. The 5D EP-JRESI data were reconstructed using DL and compared with gradient sparsity-based Total Variation (TV) and Perona-Malik (PM) methods. A hybrid reconstruction technique, Dictionary Learning-Total Variation (DLTV), was also designed to further improve the quality of reconstructed spectra. Results: The CS reconstruction of prospectively undersampled (8x and 12x) 5D EP-JRESI data acquired in prostate cancer and healthy subjects were performed using DL, DLTV, TV and PM. It is evident that the hybrid DLTV method can unambiguously resolve 2D J-resolved peaks including myo-inositol, citrate, creatine, spermine and choline. Conclusion: Improved reconstruction of the accelerated 5D EP-JRESI data was observed using the hybrid DLTV. Accelerated acquisition of in vivo 5D data with as low as 8.33% samples (12x) corresponds to a total scan time of 14 min as opposed to a fully sampled scan that needs a total duration of 2.4 h (TR = 1.2 s, 32 k x ×16 k y ×8 k z , 512 t 2 and 64 t 1 ).
- Subjects
SPECTROSCOPIC imaging; PROSTATE cancer; PROSTATE cancer patients; COMPRESSED sensing; MAGNETIC resonance imaging
- Publication
MAGMA: Magnetic Resonance Materials in Physics, Biology & Medicine, 2022, Vol 35, Issue 4, p667
- ISSN
0968-5243
- Publication type
Article
- DOI
10.1007/s10334-022-01029-z