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A novel deformable lung phantom with programably variable external and internal correlation.

Maida Ranjbar1, Pouya Sabouri1, Carlo Repetto1

  • 1Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore, MD, 21201, USA.

Medical Physics
|March 29, 2019
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Summary
This summary is machine-generated.

This study introduces a novel, programmable lung motion phantom that accurately simulates complex human respiration. The new phantom enables reproducible testing of advanced radiotherapy motion management strategies.

Keywords:
deformable lung phantomprogrammablerespiratory motion managementsurrogate-based lung motion modelvariable correlation

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Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Biomedical Engineering

Background:

  • Current lung motion phantoms for radiotherapy lack the complexity to simulate realistic human respiration.
  • Simplistic phantom designs hinder the accurate evaluation of advanced motion management techniques.
  • Complexities include external/internal deformation, variable hysteresis, and inter-anatomical motion correlation.

Purpose of the Study:

  • To design and implement a programmable lung motion phantom capable of simulating complex respiratory motions.
  • To enable reproducible changes in external-internal and internal-internal marker correlation.
  • To improve the validation of radiotherapy motion management strategies.

Main Methods:

  • Developed an in-house lung module from natural latex foam within a commercial phantom shell.
  • Integrated two independently programmable linear actuators for anterior-posterior (AP) and superior-inferior (SI) motion.
  • Embedded radiopaque markers on the external surface and within the lung module.
  • Validated motion accuracy and reproducibility using kV fluoroscopy with mathematical and patient-recorded motion traces.

Main Results:

  • Achieved high reproducibility with marker motion ranges accurate to within 0.5 mm.
  • Demonstrated variable correlation between internal-internal and internal-external marker displacements.
  • Observed a wide range of correlation parameters (-11 to 17) for SI and AP motion components.
  • Showed reduced uncertainty in estimating internal motion by monitoring a region of interest compared to a single point.

Conclusions:

  • Successfully designed and implemented a programmable, deformable lung motion phantom.
  • The phantom allows for reproducible adjustments of external-internal and internal-internal marker correlations.
  • This advanced phantom facilitates more rigorous validation of radiotherapy motion management techniques.