3D Cartesian MRI with compressed sensing and variable view sharing using complementary poisson-disc sampling

Evan Levine, Bruce Daniel, Shreyas Vasanawala, Brian Hargreaves, Manojkumar Saranathan

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Purpose: To enable robust, high spatio-temporal-resolution three-dimensional Cartesian MRI using a scheme incorporating a novel variable density random k-space sampling trajectory allowing flexible and retrospective selection of the temporal footprint with compressed sensing (CS). Methods: A complementary Poisson-disc k-space sampling trajectory was designed to allow view sharing and varying combinations of reduced view sharing with CS from the same prospective acquisition. These schemes were used for two-point Dixon-based dynamic contrast-enhanced MRI (DCE-MRI) of the breast and abdomen. Results were validated in vivo with a novel approach using variable-flip-angle data, which was retrospectively accelerated using the same methods but offered a ground truth. Results: In breast DCE-MRI, the temporal footprint could be reduced 2.3-fold retrospectively without introducing noticeable artifacts, improving depiction of rapidly enhancing lesions. Further, experiments with variable-flip-angle data showed that reducing view sharing improved accuracy in reconstruction and T1 mapping. In abdominal MRI, 2.3-fold and 3.6-fold reductions in temporal footprint allowed reduced motion artifacts. Conclusion: The complementary-Poisson-disc k-space sampling trajectory allowed a retrospective spatiotemporal resolution tradeoff using CS and view sharing, imparting robustness to motion and contrast enhancement. The technique was also validated using a novel approach of fully acquired variable-flip-angle acquisition. Magn Reson Med 77:1774–1785, 2017.

Original languageEnglish (US)
Pages (from-to)1774-1785
Number of pages12
JournalMagnetic Resonance in Medicine
Volume77
Issue number5
DOIs
StatePublished - May 2017
Externally publishedYes

Keywords

  • compressed sensing
  • dynamic contrast-enhanced MRI
  • view sharing

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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