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Related Experiment Video

Updated: Jun 6, 2026

Three-Dimensional Phase Resolved Functional Lung Magnetic Resonance Imaging
10:44

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Published on: June 21, 2024

Inter-fraction variations in respiratory motion models.

J R McClelland1, S Hughes, M Modat

  • 1Centre for Medical Image Computing, University College London, UK. j.mcclelland@cs.ucl.ac.uk

Physics in Medicine and Biology
|December 15, 2010
PubMed
Summary
This summary is machine-generated.

Patient-specific respiratory motion models are crucial for radiotherapy. Models built at the start of treatment often fail later due to significant inter-fraction motion variations.

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Area of Science:

  • Medical Physics
  • Radiotherapy
  • Image-guided therapy

Background:

  • Respiratory motion significantly impacts radiotherapy accuracy.
  • Existing motion models may not remain valid throughout treatment.
  • Inter-fraction variations necessitate adaptive treatment strategies.

Purpose of the Study:

  • To develop patient-specific respiratory motion models.
  • To analyze inter-fraction variations in respiratory motion.
  • To evaluate the accuracy of motion prediction over time.

Main Methods:

  • Deformable registration of Cine CT data to determine internal motion.
  • Derivation of a respiratory surrogate signal from 3D skin surface data.
  • Investigation of three models relating internal motion to the surrogate signal.
  • Acquisition of data from six lung cancer patients at two time points (start and end of radiotherapy).

Main Results:

  • Models accurately predicted motion within the same dataset (start or end).
  • Models showed significant prediction errors when applied to the other dataset.
  • Inter-fraction variations were primarily spatially varying baseline shifts.
  • Changes in anatomy and motion trajectories were also observed.

Conclusions:

  • Patient-specific respiratory motion models are essential for accurate radiotherapy.
  • Models require frequent updating due to significant inter-fraction variations.
  • Adaptive radiotherapy strategies should account for anatomical and motion trajectory changes.