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Fabrication and Characterization of Optical Tissue Phantoms Containing Macrostructure
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An externally and internally deformable, programmable lung motion phantom.

Yam Cheung1, Amit Sawant1

  • 1UT Southwestern Medical Center, University of Texas, Dallas, Texas 75390.

Medical Physics
|May 17, 2015
PubMed
Summary
This summary is machine-generated.

A novel programmable lung phantom accurately mimics real respiratory motion, improving accuracy for lung radiotherapy and motion management studies. This tool enhances validation of external and internal tumor tracking strategies.

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Area of Science:

  • Medical Physics
  • Radiotherapy
  • Medical Imaging

Background:

  • Current lung radiotherapy motion management relies on external surrogates for tumor motion.
  • Existing lung phantoms lack realistic internal and external thoracic deformation during respiration.
  • This limitation hinders accurate validation of respiratory motion management techniques.

Purpose of the Study:

  • To develop and test a programmable lung phantom with both external and internal deformability.
  • To create a more realistic model of thoracic anatomy deformation during respiration.
  • To provide a tool for validating lung radiotherapy motion management strategies.

Main Methods:

  • Constructed a deformable lung phantom using a commercial shell and a custom latex foam insert.
  • Programmed a motion platform with sinusoidal and patient-recorded tumor trajectories.
  • Validated phantom performance using kV x-ray fluoroscopy to assess marker reproducibility and correlation.
  • Applied the phantom to test surface photogrammetry, image registration (NiftyReg), and 4D CT accuracy.

Main Results:

  • The phantom accurately reproduced various respiratory motion patterns, including hysteresis.
  • Marker trajectory reproducibility was within 0.25 mm RMS error.
  • High correlation (R > 0.95) was observed between internal and external marker motion.
  • Validated systems (VisionRT, NiftyReg) showed high accuracy with the phantom.
  • 4D CT localization error increased with irregular patient-derived motion.

Conclusions:

  • Developed a realistic, deformable, and programmable lung phantom for motion studies.
  • The phantom is a valuable tool for validating clinical and investigational motion management in thoracic radiotherapy.
  • This realistic simulation aids in improving the accuracy of lung cancer treatment.