Quality assurance for gamma knife stereotactic radiosurgery

Area of Science:

• Medical Physics
• Radiosurgery Technology
• Quality Assurance in Healthcare

Background:

• Stereotactic radiosurgery (SRS) units, specifically Gamma Knife systems utilizing focused Cobalt-60 (60Co) beams, are increasingly adopted globally.
• Over 58 units are operational, with 11 more planned, highlighting the need for robust maintenance protocols.
• The University of Pittsburgh Medical Center (UPMC) has utilized this technology for seven years, treating over 1500 patients.

Purpose of the Study:

• To establish a comprehensive quality assurance (QA) program for stereotactic radiosurgical units (Gamma Knife).
• To ensure the consistent performance and safety of SRS units, thereby preventing accidents.
• To maintain compliance with current regulatory standards for medical radiation equipment.

Main Methods:

• Development of a QA program encompassing physics, dosimetry, and safety parameters.
• Implementation of a tiered checking schedule: daily, weekly, monthly, and annual checks.
• Inclusion of specific tolerances and timetables for each QA item, informed by seven years of measurement experience.

Main Results:

• The developed QA program is designed to detect out-of-tolerance conditions in SRS units.
• While actual error margins are minimal, the program incorporates larger tolerances to account for equipment and technique variability.
• The program has been validated through extensive use in patient treatment and ongoing system monitoring.

Conclusions:

• The implemented quality assurance program effectively identifies and prevents potential problems associated with Gamma Knife unit operation.
• Adherence to the outlined QA procedures is crucial for maintaining the safety and efficacy of stereotactic radiosurgery.
• This program serves as a model for ensuring the reliable performance of SRS technology in clinical settings.