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Treatment of Liver Metastases Using an Internal Target Volume Method for Stereotactic Body Radiotherapy
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Paraspinal volumetric modulated arc therapy.

J L Bedford1, H M Convery, V N Hansen

  • 1The Institute of Cancer Research and The Royal Marsden NHS Foundation Trust, Sutton, UK. james.bedford@icr.ac.uk

The British Journal of Radiology
|January 5, 2012
PubMed
Summary
This summary is machine-generated.

Volumetric modulated arc therapy (VMAT) effectively treats paraspinal tumors. This advanced radiation technique ensures precise dose delivery, sparing critical structures and completing treatment efficiently.

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Area of Science:

  • Radiation Oncology
  • Medical Physics

Background:

  • Paraspinal tumors present a complex treatment challenge due to proximity to the spinal cord.
  • Accurate dose delivery is crucial to maximize tumor control while minimizing radiation-induced toxicity.

Observation:

  • A single VMAT arc was planned using SmartArc software for a paraspinal tumor.
  • The treatment plan aimed for uniform dose coverage of the planning target volume (PTV) and sparing of the spinal cord planning risk volume (PRV).
  • Pre-treatment verification using diode array and radiochromic film confirmed plan accuracy.

Findings:

  • VMAT achieved homogeneous PTV dose coverage (D2% = 62.0 Gy, D98% = 55.6 Gy).
  • Spinal cord PRV received a maximum dose of 55.4 Gy to 0.1 cm³.
  • Pre-treatment verification showed high accuracy (98.8% with diode array, 93.4% with film).
  • Treatment delivery was completed successfully in a short time (2 min 15 s).

Implications:

  • VMAT is a suitable and effective method for treating complex paraspinal tumors.
  • This technique offers high-quality conformal dose distribution and efficient treatment delivery.
  • Successful implementation demonstrates VMAT's potential for challenging radiation oncology cases.