Compartmentalized low-rank recovery for high-resolution lipid unsuppressed MRSI

作者：Bhattacharya Ipshita; Jacob Mathews^*

来源：Magnetic Resonance in Medicine, 2017, 78(4): 1267-1280.

DOI：10.1002/mrm.26537

• MR spectroscopic imaging
• lipid suppression
• low-rank models
• chemical shift imaging
• fast sequences
• spiral trajectory
• dual-density acquisition

PurposeTo introduce a novel algorithm for the recovery of high-resolution magnetic resonance spectroscopic imaging (MRSI) data with minimal lipid leakage artifacts, from dual-density spiral acquisition.
MethodsThe reconstruction of MRSI data from dual-density spiral data is formulated as a compartmental low-rank recovery problem. The MRSI dataset is modeled as the sum of metabolite and lipid signals, each of which is support limited to the brain and extracranial regions, respectively, in addition to being orthogonal to each other. The reconstruction problem is formulated as an optimization problem, which is solved using iterative reweighted nuclear norm minimization.
ResultsThe comparisons of the scheme against dual-resolution reconstruction algorithm on numerical phantom and in vivo datasets demonstrate the ability of the scheme to provide higher spatial resolution and lower lipid leakage artifacts. The experiments demonstrate the ability of the scheme to recover the metabolite maps, from lipid unsuppressed datasets with echo time (TE)=55 ms.
ConclusionThe proposed reconstruction method and data acquisition strategy provide an efficient way to achieve high-resolution metabolite maps without lipid suppression. This algorithm would be beneficial for fast metabolic mapping and extension to multislice acquisitions. Magn Reson Med 78:1267-1280, 2017.

• 出版日期2017-10