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Single projection driven real-time multi-contrast (SPIDERM) MR imaging using pre-learned spatial subspace and linear

Pei Han1,2, Junzhou Chen2,3, Jiayu Xiao3

  • 1Biomedical Imaging Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA, United States of America.

Physics in Medicine and Biology
|June 13, 2022
PubMed
Summary

A new Single Projection Driven Real-time Multi-contrast (SPIDERM) MRI technique generates real-time 3D images with low latency. This novel method enables adaptive simulation and real-time image guidance for MR-guided radiation therapy.

Keywords:
MR multitaskingMR-guided radiation therapyreal time MRsubspace imaging

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Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging (MRI)

Background:

  • Real-time 3D MRI is crucial for dynamic procedures like image-guided radiation therapy.
  • Existing techniques often face limitations in speed, contrast flexibility, and latency.

Purpose of the Study:

  • To develop and assess the feasibility of a novel Single Projection Driven Real-time Multi-contrast (SPIDERM) MRI technique.
  • To enable on-the-fly generation of real-time 3D images with flexible contrast weightings and low latency.

Main Methods:

  • SPIDERM utilizes a 'prep' scan for subject-specific model learning and a 'live' scan for real-time data acquisition.
  • Images are reconstructed on-the-fly using computationally efficient matrix multiplication.
  • Multi-contrast imaging allows for data-driven regeneration of contrast-frozen images.

Main Results:

  • SPIDERM achieved a low latency of approximately 55 ms from data acquisition to image generation.
  • High correlation (R2≥0.983) was observed between SPIDERM and reference images for motion displacement.
  • Digital phantom and in-vivo studies demonstrated acceptable geometric accuracy and good image quality.

Conclusions:

  • SPIDERM successfully generates real-time multi-contrast 3D MRI with low latency.
  • The SPIDERM framework shows potential for adaptive simulation and real-time guidance in MR-guided radiation therapy.