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  3. Strong-gradient Diffusion-weighted Imaging Of Prostate Cancer Using An Inside-out Nonlinear Gradient Coil.
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  3. Strong-gradient Diffusion-weighted Imaging Of Prostate Cancer Using An Inside-out Nonlinear Gradient Coil.

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Strong-Gradient Diffusion-Weighted Imaging of Prostate Cancer Using an Inside-Out Nonlinear Gradient Coil.

Horace Z Zhang1, Nahla M H Elsaid2,3, Terence W Nixon2

  • 1Department of Biomedical Engineering, Yale University, New Haven, Connecticut, USA.

Magnetic Resonance in Medicine
|January 8, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

A novel nonlinear gradient coil significantly improves prostate diffusion-weighted imaging (DWI) quality. This technology enhances lesion detection and conspicuity in prostate cancer imaging.

Keywords:
diffusion MRIgradientprostate

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Area of Science:

  • Magnetic Resonance Imaging
  • Medical Physics
  • Radiology

Background:

  • Prostate diffusion-weighted imaging (DWI) is crucial for detecting prostate cancer.
  • Current DWI techniques can be limited by image quality and lesion conspicuity.
  • Advanced gradient coil technology may overcome these limitations.

Purpose of the Study:

  • To evaluate an inside-out nonlinear gradient coil for enhanced prostate DWI.
  • To assess improvements in image quality, lesion conspicuity, and signal-to-noise ratio (SNR).
  • To validate apparent diffusion coefficient (ADC) map accuracy.

Main Methods:

  • Developed and applied an inside-out nonlinear gradient coil for DWI with Echo Planar Imaging (EPI) readout.
  • Investigated and corrected for geometric distortion and eddy currents.
  • Acquired DWI data using protocols with bmax=1000 and 3000 s/mm², minimizing echo time (TE).
  • Compared nonlinear gradient results with linear gradient acquisitions in volunteers and patients.

    • Main Results:

    • Nonlinear gradient DWI showed reduced artifacts after corrections.
    • Apparent diffusion coefficient (ADC) maps demonstrated good agreement between linear and nonlinear gradients.
    • Significantly reduced echo time (TE) from 57-72 ms to 42-54 ms.
    • Increased signal-to-noise ratio (SNR) by 3%-38% (median 16-26%).
    • Improved lesion contrast-to-noise ratio (CNR) by a median of 133-217% and lesion-to-normal-tissue contrast ratio by 23%.

    Conclusions:

    • The inside-out nonlinear gradient coil significantly enhances prostate DWI quality.
    • This technology improves lesion conspicuity and SNR, aiding in prostate cancer detection.
    • The method offers a promising advancement for clinical prostate MRI.