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Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
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Quantifying motion for pancreatic radiotherapy margin calculation.

Gillian Whitfield1, Pooja Jain, Melanie Green

  • 1Academic Radiation Oncology, The University of Manchester, United Kingdom.

Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology
|March 14, 2012
PubMed
Summary
This summary is machine-generated.

Pancreatic radiotherapy target motion is significant, requiring larger margins. Advanced techniques like 4D planning and online correction can reduce margins for improved pancreatic cancer treatment.

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Area of Science:

  • Radiation Oncology
  • Medical Imaging
  • Cancer Research

Background:

  • Pancreatic radiotherapy (RT) faces challenges due to uncertain patient and organ motion.
  • Accurate targeting is crucial for effective treatment and minimizing toxicity.

Purpose of the Study:

  • To quantify 3D patient and organ motion during pancreatic RT.
  • To calculate necessary treatment margins based on observed motion.
  • To evaluate the impact of advanced planning and correction techniques on margins.

Main Methods:

  • Acquisition of cone-beam computed tomography (CBCT) and orthogonal fluoroscopy images from 13 locally advanced pancreatic cancer patients.
  • Calculation of bony setup errors using CBCT.
  • Determination of inter- and intra-fraction fiducial motion using CBCT projections and fluoroscopy.

Main Results:

  • Systematic setup errors ranged from 2.0-3.2 mm, with random errors up to 3.6 mm.
  • Fiducial motion showed substantial variation, with intra-fractional motion up to 20.6 mm longitudinally.
  • Calculated clinical to planning target volume (CTV-PTV) margins were 1.4 cm (lateral), 1.4 cm (vertical), and 3.0 cm (longitudinal), reducible with 4D planning and online correction.

Conclusions:

  • Standard CTV-PTV margins may be insufficient for pancreatic RT due to target motion.
  • Improved immobilization, individualized respiratory motion management, online setup correction, and 4D planning are recommended to enhance targeting accuracy.