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Diffusion-Weighted Echo Planar Imaging using MUltiplexed Sensitivity Encoding and Reverse Polarity Gradient in Head

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Multiplexed sensitivity encoding with reverse-polarity gradient (MUSE-DWEPI with RPG) significantly reduces geometric distortion in diffusion-weighted MRI compared to conventional methods. This advanced technique maintains accurate apparent diffusion coefficient measurements for head and neck imaging.

Keywords:
Head and neck regiondiffusion-weighted MRIecho planar imagingeddy currentgeometrical distortionmagnetic field inhomogeneitymultiplexed sensitivity encodingreverse-polarity gradients

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Area of Science:

  • Medical Imaging
  • Radiology
  • Diffusion-Weighted Magnetic Resonance Imaging (DW-MRI)

Background:

  • Geometric distortion (GD) is a significant challenge in diffusion-weighted echo-planar imaging (DWEPI), impacting image accuracy.
  • Multiplexed sensitivity encoding (MUSE) techniques aim to mitigate artifacts in DWEPI.
  • Reverse-polarity gradient (RPG) is a potential method to further reduce distortion in MRI sequences.

Purpose of the Study:

  • To compare the geometric distortion (GD) correction performance of single-shot DWEPI (SS-DWEPI), MUSE-DWEPI, and MUSE-DWEPI with RPG.
  • To evaluate the impact of these techniques on apparent diffusion coefficient (ADC) measurements in phantoms and head and neck cancer patients.
  • To assess the spatial accuracy and correlation of imaging data obtained by the three DW-MRI methods.

Main Methods:

  • Phantom studies using the American College of Radiology (ACR) phantom and a Quantitative Imaging Biomarker Alliance (QIBA) ice-water phantom at 3T MRI.
  • Acquisition of diffusion-weighted MRI data from 11 head and neck cancer patients using SS-DWEPI, MUSE-DWEPI, and MUSE-DWEPI with RPG.
  • Statistical analysis including Wilcoxon signed-rank (WSR) and Kruskal-Wallis (KW) tests for ADC values and qualitative radiologist ratings.

Main Results:

  • MUSE-DWEPI with RPG demonstrated significantly lower geometric distortion (0.17%) compared to MUSE-DWEPI (1.53%) and SS-DWEPI (2.1%) in the ACR phantom.
  • Root-mean-square errors for geometric distortion were substantially reduced with MUSE-DWEPI with RPG (0.58 mm) versus MUSE-DWEPI (3.37 mm) and SS-DWEPI (5.07 mm).
  • No significant differences in ADC measurements were found between the three methods for healthy tissues and neoplasms (P > .05), but MUSE-DWEPI with RPG showed improved spatial accuracy (R² = 0.791) in the head and neck region.

Conclusions:

  • MUSE-DWEPI with RPG effectively reduces geometric distortion in diffusion-weighted MRI compared to MUSE-DWEPI and conventional SS-DWEPI.
  • This technique preserves the accuracy of apparent diffusion coefficient measurements, crucial for quantitative analysis in oncology.
  • MUSE-DWEPI with RPG offers improved spatial accuracy for head and neck imaging, enhancing diagnostic reliability in DW-MRI studies.