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

Hiroyuki Shinohara1,2, Takeyuki Hashimoto3, Nobuyuki Takeyama2

  • 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 summary is machine-generated.

Compressed sensing MRI (CS-MRI) with 50% sampling achieved image quality comparable to full sampling. Reconstruction methods showed minimal degradation, even with noise, indicating CS-MRI

Keywords:
MRIbrain imagecompressed sensingimage processingvisual evaluation

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Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging
  • Image Reconstruction

Background:

  • Compressed Sensing MRI (CS-MRI) offers potential for faster scan times.
  • Evaluating CS-MRI performance with reduced sampling is crucial for clinical application.
  • Standardized numerical and visual assessments are needed for robust validation.

Purpose of the Study:

  • To numerically and visually evaluate Compressed Sensing MRI (CS-MRI) using 2D Cartesian sampling.
  • To assess the impact of a 50% sampling ratio on image quality for various brain tissues.
  • To compare CS-MRI reconstruction quality against original images under different noise conditions.

Main Methods:

  • Numerical simulations using the BrainWeb MRI Database with T1-weighted, T2-weighted, and PD-weighted images.
  • Reconstruction via L1-norm minimization (wavelet transform and total variation) using the conjugate gradient method.
  • Visual evaluation by three radiologists assessing artifacts, anatomical structures, and tissue contrast.

Main Results:

  • In noise-free conditions, Root Mean Square Errors (RMSE) for T1WI ranged from 2.99-3.57, T2WI from 4.72-5.65, and PDWI from 1.91-2.36.
  • Anatomical Region of Interest (ROI) RMSE varied from 1.77-8.53.
  • Visual evaluation indicated CS-MRI quality was nearly equal to original images, with few artifacts; T1-CS and PD-CS images showed no significant degradation with noise levels ≤30 dB.

Conclusions:

  • Compressed Sensing MRI (CS-MRI) with 50% Cartesian sampling provides high-quality brain images comparable to fully sampled acquisitions.
  • Reconstruction techniques effectively preserve anatomical details and tissue contrast, with minimal artifacts.
  • CS-MRI demonstrates robustness to noise, suggesting its feasibility for clinical neuroimaging applications.