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Continuous real time 3D motion reproduction using dynamic MRI and precomputed 4DCT deformation fields.

Damien Dasnoy-Sumell1, Kevin Souris2, G Van Ooteghem2

  • 1Institute of Information and Communication Technologies, Electronics and Applied Mathematics, Universite Catholique de Louvain, Louvain-la-Neuve, Belgium.

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This study presents a novel method for real-time tumor motion tracking during radiotherapy using combined MRI and CT imaging. The technique accurately reconstructs 4D CT images, improving adaptive radiotherapy precision.

Keywords:
IGRTMRIimage deformationmotion modelreal-time tracking

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Area of Science:

  • Medical Imaging
  • Radiation Oncology
  • Image-guided Therapy

Background:

  • Radiotherapy for mobile tumors necessitates advanced imaging to mitigate motion-related inaccuracies.
  • Integrated magnetic resonance imaging (MRI) and linear accelerator systems enable real-time, non-ionizing imaging for motion tracking.

Purpose of the Study:

  • To develop and validate a method for real-time motion tracking using MRI and reconstructing 4D CT images for adaptive radiotherapy.
  • To combine MRI's motion tracking capabilities with CT's dose calculation requirements.

Main Methods:

  • A novel approach combining 2D fast MRI and CT imaging for real-time motion tracking.
  • Utilizing manually placed navigators for tracking organ interfaces visible in both MRI and CT.
  • Employing precomputed deformation fields from 4D CT to reconstruct real-time 3D CT sequences.

Main Results:

  • The developed method precisely tracks tumor motion using MRI.
  • Real-time reconstruction of 3D CT images accurately reflects tracked motion.
  • The final 4D CT image sequence reproduces MRI-captured motion with sub-2mm precision.

Conclusions:

  • This integrated MRI-CT approach enables accurate, real-time motion compensation in radiotherapy.
  • The method enhances adaptive radiotherapy by providing precise, motion-corrected imaging.
  • The technique offers improved treatment accuracy for mobile tumors.