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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Enhanced 4D diffusion-weighted PROPELLER echo-planar imaging with collaborative blade reconstruction.

Lu Wang1,2,3, Tian Li3, Chenyang Liu3

  • 1College of Information Science and Engineering, Northeastern University, Shenyang, Liaoning, People's Republic of China.

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|November 14, 2025
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Summary
This summary is machine-generated.

A new four-dimensional diffusion-weighted imaging (4D-DWI) technique, 4D-DW-PROP-EPI-JBCR, significantly enhances image quality and geometric fidelity for image-guided radiotherapy (IGRT). This improved 4D-DWI reduces acquisition time and distortion, making it more clinically useful.

Keywords:
PROPELLER-EPIfour-dimensional diffusion-weighted imagingimage-guided radiotherapyjoint-blade collaborative reconstruction

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Area of Science:

  • Medical Imaging
  • Radiotherapy
  • Magnetic Resonance Imaging

Background:

  • Four-dimensional diffusion-weighted imaging (4D-DWI) offers superior soft-tissue contrast for image-guided radiotherapy (IGRT) compared to conventional 4D-magnetic resonance imaging.
  • Clinical application of 4D-DWI is limited by geometric distortion and prolonged acquisition times.

Purpose of the Study:

  • To introduce an improved respiratory-correlated 4D-DWI technique, 4D-DW-PROP-EPI-JBCR, addressing limitations of geometric distortion and acquisition time.
  • To evaluate the performance of the proposed technique against the previous 4D-DW-PROPELLER-EPI using simulations and in vivo experiments.

Main Methods:

  • The 4D-DW-PROP-EPI-JBCR technique involves data acquisition, coil sensitivity/phase error estimation, retrospective sorting, and joint-blade collaborative reconstruction (JBCR).
  • Performance was evaluated using metrics including k-space uniformity, point spread function (PSF) quality, sampling factor (SF), image quality (PSNR, SSIM, HFEN, SNR), and geometric fidelity (DSC, HD).
  • Paired t-tests were used for comparisons, with statistical significance set at P < 0.05.

Main Results:

  • 4D-DW-PROP-EPI-JBCR eliminated strict k-space uniformity requirements and achieved enhanced PSFs with fewer acquisitions compared to 4D-DW-PROPELLER-EPI.
  • Significant improvements in image quality were observed for 4D-DW-PROP-EPI-JBCR across all metrics: SSIM (0.83-0.92 vs 0.81-0.90), PSNR (20.56-25.20 vs 20.24-24.48), HFEN (0.49-0.678 vs 0.52-0.80), and SNR (31.1-32.6 dB vs 28.6-29.5 dB).
  • Excellent geometric fidelity (DSC: 0.90 ± 0.03, HD: 2.37 ± 1.12) and a reduced SF (1.9 vs 2.4) were achieved.

Conclusions:

  • The 4D-DW-PROP-EPI-JBCR technique enables distortion-free, respiratory-correlated 4D-DWI.
  • It reduces the sampling factor by over 20% compared to 4D-DW-PROPELLER-EPI.
  • This technique significantly enhances the clinical utility of 4D-DWI for abdominal IGRT.