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Leksell Gamma Knife coordinate setting slippage: how often, how much?
Robert L Foote1, Bruce E Pollock, Michael J Link
1Division of Radiation Oncology and Department of Neurologic Surgery, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA. robert@mayo.edu
Journal of Neurosurgery
|October 16, 2004
Summary
Coordinate setting slippage during gamma knife surgery (GKS) is rare but occurs. This slippage, though infrequent, is linked to patient weight and generally falls within the system
Area of Science:
- Neurosurgery
- Medical Physics
Background:
- Gamma Knife Surgery (GKS) is a stereotactic radiosurgery technique.
- Accurate coordinate targeting is crucial for effective GKS treatment.
Purpose of the Study:
- To assess the frequency and extent of coordinate setting slippage in GKS.
- To identify factors influencing coordinate slippage during GKS procedures.
Main Methods:
- Analysis of coordinate data (x, y, z) and gamma angles from 36 patients undergoing GKS.
- Post-treatment verification of 1548 coordinates and 258 isocenters on a Leksell unit.
- Evaluation of slippage incidence, affected settings, and magnitude.
Main Results:
- Coordinate setting slippage was observed but found to be infrequent during GKS.
- The magnitude of slippage was typically within the inherent error margins of the stereotactic system.
- A significant correlation was identified between patient weight and the occurrence of slippage.
Conclusions:
- Coordinate setting slippage can occur in Leksell GKS but is a rare event.
- Observed slippage is generally minor and within acceptable stereotactic system tolerances.
- Patient weight is a significant factor associated with coordinate setting slippage in GKS.