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[Stereotactic radiosurgery using a linear accelerator (LINAC): simulation and positioning]

M Takayama¹, M Nakamura, H Ikezaki

¹Department of Radiology, Kyorin University School of Medicine.

No Shinkei Geka. Neurological Surgery

|March 1, 1995

Summary

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This study investigates using a linear accelerator (LINAC) for stereotactic radiosurgery, addressing key challenges like target simulation and patient positioning. The developed methods demonstrate feasibility for precise intracranial treatments.

Area of Science:

Neurosurgery
Radiation Oncology
Medical Physics

Context:

Gamma units are effective for stereotactic radiosurgery (SRS) of small intracranial lesions.
Linear accelerators (LINACs) present unique challenges for SRS, including accuracy, collimation, dosimetry, and target simulation.

Purpose:

To investigate and validate methods for target simulation and patient positioning in LINAC-based SRS.
To assess the clinical applicability of high-energy X-ray narrow beams for SRS.

Summary:

Developed and tested collimators producing narrow X-ray beams (9mm, 18mm, 27mm phi) suitable for SRS, confirmed by dose profiles.
Utilized CT scans for target simulation and a stereotactic frame for precise patient head fixation.
Employed laser pointers and a manipulator system to align the target with the LINAC isocenter, ensuring accurate irradiation.

Related Experiment Videos

Impact:

Provides a viable approach for LINAC-based SRS, potentially expanding treatment options for intracranial diseases.
Highlights the need for established dosimetry methods for high-energy X-ray narrow beams in SRS.
Demonstrates the successful integration of simulation, fixation, and targeting for precise radiosurgery.