Compressed sensing acceleration of biexponential 3D-T_1ρ relaxation mapping of knee cartilage.

ABSTRACT:

Purpose

Use compressed sensing (CS) for 3D biexponential spin-lattice relaxation time in the rotating frame (T_1ρ ) mapping of knee cartilage, reducing the total scan time and maintaining the quality of estimated biexponential T_1ρ parameters (short and long relaxation times and corresponding fractions) comparable to fully sampled scans.

Methods

Fully sampled 3D-T_1ρ -weighted data sets were retrospectively undersampled by factors 2-10. CS reconstruction using 12 different sparsifying transforms were compared for biexponential T_1ρ -mapping of knee cartilage, including temporal and spatial wavelets and finite differences, dictionary from principal component analysis (PCA), k-means singular value decomposition (K-SVD), exponential decay

SUBMITTER: Zibetti MVW 

PROVIDER: S-EPMC6289851 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature