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Echo planar imaging with compressed sensitivity encoding (EPICS): Usefulness for head and neck diffusion-weighted

Naofumi Yoshida1, Takeshi Nakaura1, Kosuke Morita2

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Compressed SENSE echo planar imaging (EPICS) enhances head and neck MRI quality by improving contrast and reducing distortion. This advanced DWI technique maintains apparent diffusion coefficient values and scan times.

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Diffusion Magnetic Resonance ImagingEcho-Planar ImagingMagnetic Resonance ImagingNeckRetrospective Studies

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Area of Science:

  • Radiology
  • Medical Imaging
  • Magnetic Resonance Imaging

Background:

  • Diffusion-weighted imaging (DWI) is crucial for head and neck MRI.
  • Echo planar imaging (EPI) is a common DWI technique.
  • Compressed SENSE (CS) is an acceleration technique to improve MRI speed and quality.

Purpose of the Study:

  • To evaluate the performance of echo planar imaging with compressed SENSE (EPICS) for head and neck DWI.
  • To compare EPICS with conventional SENSE EPI techniques.

Main Methods:

  • Retrospective analysis of 32 patients undergoing head and neck DWI.
  • Comparison of conventional SENSE (factor=2), fast SENSE (factor=4), and EPICS (factor=4).
  • Quantitative analysis included contrast-to-noise ratio (CNR), apparent diffusion coefficient (ADC), geometric distortion, and coefficient of variation (CV). Qualitative analysis by two radiologists.

Main Results:

  • EPICS demonstrated higher CNR compared to fast SENSE.
  • Significantly lower anterior-posterior distortion was observed with EPICS versus conventional scans.
  • No significant differences in ADC values were found between EPICS and conventional scans.
  • EPICS showed a significantly lower coefficient of variation (CV) than conventional scans.

Conclusions:

  • Compressed SENSE, when combined with a high acceleration factor, enhances image quality, homogeneity, and reduces distortion in head and neck DWI.
  • EPICS maintains apparent diffusion coefficient values and scan time duration.
  • EPICS represents a promising advancement for head and neck DWI MRI.