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Optimal acceleration factor for image acquisition in turbo spin echo: diffusion-weighted imaging with compressed

Hiroyuki Takashima1,2, Mitsuhiro Nakanishi3, Rui Imamura3

  • 1Division of Radiology and Nuclear Medicine, Sapporo Medical University Hospital, Sapporo, Japan. takashima@sapmed.ac.jp.

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Summary

To reduce MRI scan time, researchers analyzed image quality and apparent diffusion coefficient (ADC) at various acceleration factors (AF). An AF below 8 is optimal for maintaining image quality and ADC accuracy.

Keywords:
Acceleration factorCompressed sensingTurbo spin echo diffusion-weighted image

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Area of Science:

  • Medical Imaging
  • Radiology
  • Magnetic Resonance Imaging

Background:

  • Accelerated Magnetic Resonance Imaging (MRI) techniques are crucial for reducing scan times.
  • Optimizing acceleration factors (AF) is essential to balance speed with diagnostic image quality and quantitative accuracy.

Purpose of the Study:

  • To determine the optimal acceleration factor (AF) for reducing MRI scan time while preserving image quality and apparent diffusion coefficient (ADC) accuracy.
  • To analyze the impact of increasing AF on DWI image quality and ADC measurements.

Main Methods:

  • MRI acquisitions were performed with AF ranging from 2 to 20.
  • Image quality was assessed using the structural similarity (SSIM) index for DWI images.
  • ADC accuracy was evaluated using the coefficient of variation (%CV).

Main Results:

  • A significant decrease in SSIM was observed at AF ≥ 8 compared to AF = 2 (p < 0.05).
  • The %CV of ADC increased significantly at AF ≥ 10 compared to the reference (p < 0.01).
  • Image quality and ADC measurements notably degraded at AF > 8.

Conclusions:

  • An acceleration factor (AF) below 8 is recommended for reducing MRI scan time.
  • Maintaining an AF < 8 ensures preservation of diagnostic image quality and ADC reliability.