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Related Experiment Videos

Implementation of multiple isocentre treatment for dynamic radiosurgery

R Ramani1, P F O'Brien, P Davey

  • 1Division of Medical Physics, Toronto Sunny Brook Regional Cancer Centre, North York, Ontario, Canada.

The British Journal of Radiology
|July 1, 1995
PubMed
Summary

A new multiple isocenter technique for radiosurgery improves treatment of complex, non-spherical, or multiple lesions. This advanced method ensures accurate dose delivery for challenging cancer cases.

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Area of Science:

  • Neurosurgery
  • Radiation Oncology
  • Medical Physics

Background:

  • Single isocenter dynamic rotation radiosurgery introduced in 1988 at T-BRCC.
  • Over 100 patients treated with single isocenter technique.
  • 25-30% of patients presented with complex targets (non-spherical or multiple lesions).

Observation:

  • A significant proportion of patients (25-30%) presented with non-spherical or multiple lesions requiring complex dose distribution planning.
  • Overlapping dose distributions and normalization posed challenges for treating these complex targets.

Findings:

  • A multiple isocenter technique was developed and implemented in September 1992 to address complex target geometries.
  • Dose verification using radiochromic film in a phantom demonstrated agreement between planned and delivered doses within +/- 1 mm.

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  • The study examined the impact of multiple isocenters on dose distribution penumbra.

    • Implications:

    • The multiple isocenter technique offers improved precision for radiosurgery in cases with non-spherical or multiple brain lesions.
    • Accurate dose delivery and normalization are crucial for optimizing treatment outcomes in complex radiosurgical cases.
    • This advancement enhances the capability to manage challenging brain tumor targets with radiosurgery.