PRESAGE 3D dosimetry accurately measures Gamma Knife output factors

Gamma Knife Dosimetry & Treatment Planning

Study of a spherical phantom for Gamma knife dosimetry

Four 16 cm diameter spherical phantoms were modeled in this study: a homogenous water phantom, and three water phantoms with 1 cm thick shell each made of different materials (PMMA, Plastic WaterTM and polystyrene). The PENELOPE Monte Carlo code was utilized to simulate photon beams from the Leksell Gamma Knife (LGK) unit and to determine absorbed dose to water (Dw) from a single 18 mm beam del...

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 ...

Monte Carlo calculated output factors of a Leksell Gamma Knife unit.

The Leksell Gamma Knife is a standard radiosurgical tool for treating brain lesions by directing beams of gamma radiation to a specific region. The diameter of the gamma beams is confined by collimator systems and available collimator sizes are 4, 8, 14 and 18 mm. The reduction in dose rate for each collimator helmet is called the output factor (OPF). Experimental determination of OPFs is diffi...