Improved image quality for static blade magnetic resonance imaging using the total-variation regularized least absolute deviation solver

Hsin Chia Chen, Haw Chiao Yang, Chih Ching Chen, Seb Harrevelt, Yu Chieh Chao, Jyh Miin Lin, Wei Hsuan Yu, Hing Chiu Chang, Chin Kuo Chang, Feng Nan Hwang

Research output: Contribution to journalArticlepeer-review

Abstract

In order to improve the image quality of BLADE magnetic resonance imaging (MRI) using the index tensor solvers and to evaluate MRI image quality in a clinical setting, we imple-mented BLADE MRI reconstructions using two tensor solvers (the least-squares solver and the L1 total-variation regularized least absolute deviation (L1TV-LAD) solver) on a graphics processing unit (GPU). The BLADE raw data were prospectively acquired and presented in random order before being assessed by two independent radiologists. Evaluation scores were examined for con-sistency and then by repeated measures analysis of variance (ANOVA) to identify the superior algorithm. The simulation showed the structural similarity index (SSIM) of various tensor solvers ranged between 0.995 and 0.999. Inter-reader reliability was high (Intraclass correlation coefficient (ICC) = 0.845, 95% confidence interval: 0.817, 0.87). The image score of L1TV-LAD was significantly higher than that of vendor-provided image and the least-squares method. The image score of the least-squares method was significantly lower than that of the vendor-provided image. No signifi-cance was identified in L1TV-LAD with a regularization strength of λ = 0.4–1.0. The L1TV-LAD with a regularization strength of λ = 0.4–0.7 was found consistently better than least-squares and vendor-provided reconstruction in BLADE MRI with a SENSitivity Encoding (SENSE) factor of 2. This warrants further development of the integrated computing system with the scanner.

Original languageEnglish
Pages (from-to)555-572
Number of pages18
JournalTomography
Volume7
Issue number4
DOIs
StatePublished - Dec 2021

Keywords

  • BLADE MRI
  • Graphic processing unit (GPU)
  • Least absolute deviation
  • Non-uniform fast Fourier transform (NUFFT)

Fingerprint

Dive into the research topics of 'Improved image quality for static blade magnetic resonance imaging using the total-variation regularized least absolute deviation solver'. Together they form a unique fingerprint.

Cite this