Development of a 3-dimensional dosimetry system for Leksell Gamma Knife Perfexion

Development of a Monte Carlo model for treatment planning dose verification of the Leksell Gamma Knife Perfexion radiosurgery system

Detailed Monte Carlo (MC) modeling of the Leksell Gamma Knife (GK) Perfexion (PFX) collimator system is the only accurate ab initio approach appearing in the literature. As a different approach, in this work, we present a MC model based on film measurement. By adjusting the model parameters and fine-tuning the derived fluence map for each individual source to match the manufacturer's ring outpu...

Phantom Positioning Variation in the Gamma Knife® Perfexion Dosimetry

Radiation dosimetry in the Leksell Gamma Knife treatment room

The medical technology company Elekta is the manufacturer of the worldwide used Leksell Gamma Knife, LGK, an instrument specially designed for treating brain disorders. Sweden today has two LGKs treating patients, one of an older model and one newer. Both are owned by the Karolinska Hospital and placed in Stockholm. The radioactive sources of Cobalt in the machine lead to an enhanced radiation ...

Choice of phantom materials for dosimetry of Leksell Gamma Knife unit: a Monte Carlo study.

In calculations for the Leksell Gamma Knife, GammaPlan employs a tissue equivalent material without the presence of a skull bone, while dosimetry work is based on a polystyrene phantom. The compatibility of these dose distributions is uncertain. The Monte Carlo technique was employed to determine the radial dose distributions from a single 14 mm collimator helmet in 160 mm diam phantoms with di...

Effective usage of a clearance check to avoid a collision in Gamma Knife Perfexion radiosurgery with the Leksell skull frame

Skull frame attachment is one of the most significant issues with Gamma Knife radiosurgery. Because of the potential for suffering by patients, careful control of the frame position is required to avoid circumstances such as collision between the frame or the patient's head and the collimator helmet, and inaccessible target coordinates. This study sought to develop a simulation method to find t...