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Related Experiment Videos

SMASH and SENSE: experimental and numerical comparisons.

B Madore1, N J Pelc

  • 1Lucas MRS Center, Department of Radiology, Stanford University School of Medicine, Stanford, California, USA. bruno@bwh.harvard.edu

Magnetic Resonance in Medicine
|May 30, 2001
PubMed
Summary

This study compared parallel imaging methods, finding SMASH had more artifacts than SENSE. SENSE offered good signal-to-noise ratio (SNR) initially but degraded with increased acceleration.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Technology

Background:

  • Parallel imaging techniques accelerate MRI acquisition by using multiple receiver coils.
  • Artifacts and noise are critical factors affecting image quality in parallel MRI.

Purpose of the Study:

  • To compare the artifact and noise performance of three distinct parallel imaging methods: SMASH, Cartesian SENSE, and the "scissors method."
  • To evaluate the impact of acceleration factors on image quality across different parallel imaging strategies.

Main Methods:

  • Implementation and comparison of original SMASH, Cartesian SENSE, and a novel "scissors method" for parallel MRI.
  • Experimental and numerical analysis of artifact and noise levels at various acceleration factors.

Main Results:

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  • SMASH (Simultaneous Acquisition of Spatial Harmonics) demonstrated significantly higher artifact levels compared to SENSE across all tested acceleration factors.
  • SENSE (Sensitivity Encoding) provided near-optimal signal-to-noise ratio (SNR) at lower acceleration factors.
  • Increasing acceleration in SENSE led to a sharp increase in noise, although artifact levels remained low.

Conclusions:

  • Cartesian SENSE offers a favorable balance of low artifacts and acceptable SNR at moderate acceleration factors compared to SMASH.
  • The "scissors method" and other parallel imaging approaches warrant further investigation to understand their performance across the full spectrum of applications.