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Related Experiment Videos

Development of collimator insert for linac based stereotactic irradiation.

I R Singh1, S Brindha, B P Ravindran

  • 1Department of Radiotherapy, Christian Medical College and Hospital, Vellore, Tamil Nadu, India.

Physics in Medicine and Biology
|October 26, 1999
PubMed
Summary

Researchers developed custom collimator inserts using Cerrobend, achieving dosimetry accuracy within ±2.4% for clinical applications. This cost-effective method ensures suitability for various field sizes in radiation therapy.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Materials Science

Background:

  • Commercially available collimator inserts can be expensive or unavailable.
  • Accurate dosimetry is crucial for effective radiation therapy.
  • Local development of medical devices can reduce costs and improve accessibility.

Purpose of the Study:

  • To develop and validate custom collimator inserts using low-melting alloy (Cerrobend).
  • To compare dosimetry parameters (TMR, OAR, output factor) with commercial inserts.
  • To ensure clinical suitability through rigorous acceptance and dose verification testing.

Main Methods:

  • Fabrication of 15 mm collimator inserts using Cerrobend.
  • Dosimetric comparison with commercial Radionics inserts.

Related Experiment Videos

  • Performance of acceptance tests: concentricity, beam size, radiation leakage.
  • Dose verification using thermoluminescent dosimeters (7LiF rods) and FBX chemical dosimeters in a phantom.

    • Main Results:

    • Dosimetry parameters of developed inserts were comparable to commercial ones.
    • Acceptance tests confirmed suitability for clinical use.
    • Dose variations within +2.4% (7LiF) and -2.0% (FBX) were achieved during verification.

    Conclusions:

    • The developed Cerrobend collimator inserts are suitable for clinical use.
    • The fabrication method is standardized and cost-effective.
    • This facilitates the development of custom inserts for diverse field sizes in radiation therapy.