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A halo-ring technique for fractionated stereotactic radiotherapy
B G Clark1, E B Podgorsak, L Souhami
1Department of Medical Physics, Montréal General Hospital, McGill University, Québec, Canada.
The British Journal of Radiology
|June 1, 1993
Summary
Fractionated stereotactic radiotherapy extends radiosurgery for brain diseases. This technique improves treatment by sparing normal cells, enhancing the therapeutic ratio for intracranial conditions.
Area of Science:
- Neurosurgery
- Radiation Oncology
- Medical Physics
Background:
- Stereotactic radiosurgery is effective for non-malignant brain diseases like arteriovenous malformations.
- Fractionated stereotactic radiotherapy (FSRT) is an extension of radiosurgery for intracranial disease.
Purpose of the Study:
- To describe an extension of linear accelerator-based radiosurgical technique to fractionated treatment of intracranial disease.
- To detail the physical requirements and quality assurance procedures for FSRT using a halo-ring immobilization system.
Main Methods:
- Initial treatment uses a stereotactic frame for localization and immobilization.
- Subsequent treatments utilize a neurosurgical halo-ring for immobilization.
- A technique for checking rotational beam parameters and collimator alignment prior to treatment is employed.
Main Results:
- Fractionated stereotactic radiotherapy spares normal cells within the treatment volume.
- The technique improves the therapeutic ratio compared to single-fraction radiosurgery.
- Stringent quality assurance ensures spatial accuracy with halo-ring immobilization.
Conclusions:
- Fractionated stereotactic radiotherapy is a viable extension of radiosurgery for intracranial diseases.
- The halo-ring system and rigorous quality assurance are crucial for accurate FSRT delivery.
- This approach enhances treatment efficacy by improving the therapeutic ratio.