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[Numerical and Visual Evaluations of Compressed Sensing MRI Using 2D Radial Sampling].

Hiroyuki Shinohara1,2, Takeyuki Hashimoto3, Daiki Tamada4

  • 1Tokyo Metropolitan University.

Igaku Butsuri : Nihon Igaku Butsuri Gakkai Kikanshi = Japanese Journal of Medical Physics : an Official Journal of Japan Society of Medical Physics
|February 9, 2018
PubMed
Summary

This study investigated two-dimensional radial compressed sensing (2D radial CS) MRI for brain imaging. Results show promising image quality for T1-weighted, T2-weighted, and proton density-weighted images, suggesting its potential for clinical use.

Keywords:
MRIbrain imagecompressed sensingimage processingvisual evaluation

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Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging (MRI)
  • Compressed Sensing (CS)

Background:

  • Two-dimensional radial compressed sensing (2D radial CS) offers incoherence sampling in k-space, distinct from conventional Cartesian MRI.
  • The potential of 2D radial CS in MRI applications remains underexplored.
  • This study provides a comprehensive evaluation of 2D radial CS for brain imaging.

Purpose of the Study:

  • To numerically and visually evaluate the performance of 2D radial CS MRI.
  • To assess image reconstruction quality across different brain tissue types and weighting schemes.

Main Methods:

  • Utilized the Brainweb MRI Database for T1-weighted (T1WI), T2-weighted (T2WI), and proton density-weighted (PDWI) brain images.
  • Employed 80-spoke radial sampling with 256 pixels per spoke.
  • Reconstruction involved minimizing the L1 norm (wavelet transform and total variation) subject to data fidelity.

Main Results:

  • Numerical evaluation showed low Root Mean Square Error (RMSE) for T1WI (3.75-5.05) and PDWI (3.44-4.46) across anatomical regions.
  • T2WI exhibited slightly higher RMSE (8.75-11.65), with ROI-specific values ranging from 4.31 to 6.99.
  • Radiologist visual evaluation yielded high scores: 96% for T1WI, 74-81% for T2WI, and 81-89% for PDWI, indicating good artifact, structure, and contrast representation.

Conclusions:

  • 2D radial CS MRI demonstrates effective image reconstruction for various brain contrasts.
  • The technique shows potential for clinical applications, particularly for T1WI and PDWI.
  • Further investigation is warranted to optimize 2D radial CS for T2WI and broader clinical implementation.