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Motion-resolved four-dimensional abdominal diffusion-weighted imaging using PROPELLER EPI (4D-DW-PROPELLER-EPI).

Lu Wang1,2, Tian Li1, Jing Cai1

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A new four-dimensional diffusion-weighted PROPELLER EPI (4D-DW-PROPELLER-EPI) technique provides distortion-free imaging for abdominal radiotherapy. This advanced method improves motion resolution and acquisition efficiency, benefiting image-guided treatments.

Keywords:
4D-DWIK-B amplitude binningPROPELLER-EPIdistortion-free imagesgolden angle

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Area of Science:

  • Magnetic Resonance Imaging
  • Medical Physics
  • Radiotherapy Technology

Background:

  • Motion artifacts and geometric distortions in diffusion-weighted imaging (DWI) hinder accurate assessment of abdominal tumors.
  • Current 4D-DWI techniques struggle with adequate frame rates and image quality for real-time applications like radiotherapy.

Purpose of the Study:

  • To develop and evaluate a distortion-free, motion-resolved four-dimensional diffusion-weighted PROPELLER EPI (4D-DW-PROPELLER-EPI) technique.
  • To enhance the utility of 4D-DWI for clinical abdominal radiotherapy (RT).

Main Methods:

  • Proposed an improved abdominal 4D-DWI technique, 4D-DW-PROPELLER-EPI, based on 2D-DW-PROPELLER-EPI.
  • Implemented golden-angle multi-blade acquisition for efficient k-space coverage and flexible time-resolved data.
  • Developed a novel k-space and blade (K-B) amplitude binning method to optimize blade number and k-space uniformity.

Main Results:

  • Demonstrated the feasibility of distortion-free 4D-DWI using the proposed 4D-DW-PROPELLER-EPI in digital phantoms and healthy subjects.
  • The K-B amplitude binning method improved acquisition efficiency and data reconstruction performance, as shown by 4D completeness metrics.
  • The technique successfully resolved respiratory motion with improved frame rates.

Conclusions:

  • 4D-DW-PROPELLER-EPI with K-B amplitude binning provides distortion-free 4D-DWI for resolving respiratory motion.
  • This advanced technique holds significant potential for improving image-guided abdominal radiotherapy.