Unintended Attenuation in the Leksell Gamma Knife Perfexion Calibration-phantom Adaptor and Its Effect on Dose Calibration

Overview

Journal Med Phys

Specialty Biophysics

Date 2009 May 29

PMID 19472627

Citations 3

Authors

Jagdish P Bhatnagar

Josef Novotny Jr

Mubina A Quader

Greg Bednarz

M Saiful Huq

Affiliations

Soon will be listed here.

Abstract

The calibration of Leksell Gamma Knife Perfexion (LGK PFX) is performed using a spherical polystyrene phantom 160 mm in diameter, which is provided by the manufacturer. This is the same phantom that has been used with LGK models U, B, C, and 4C. The polystyrene phantom is held in irradiation position by an aluminum adaptor, which has stainless steel side-fixation screws. The phantom adaptor partially attenuates the beams from sectors 3 and 7 by 3.2% and 4.6%, respectively. This unintended attenuation introduces a systematic error in dose calibration. The overall effect of phantom-adaptor attenuation on output calibration of the LGK PFX unit is to underestimate output by about 1.0%.

Citing Articles

Experimental investigation of TRS-483 reference dosimetry correction factors for Leksell Gamma Knife® Icon™ beams.

Hager W, Kaveckyte V, Benmakhlouf H Med Phys. 2020; 48(1):434-444.

PMID: 33119131 PMC: 7894485. DOI: 10.1002/mp.14561.

A comparison of the convolution and TMR10 treatment planning algorithms for Gamma Knife radiosurgery.

Fallows P, Wright G, Harrold N, Bownes P J Radiosurg SBRT. 2018; 5(2):157-167.

PMID: 29657896 PMC: 5893456.

Target and peripheral dose from radiation sector motions accompanying couch repositioning of patient coordinates with the Gamma Knife(®) Perfexion(™).

Tran T, Wu V, Malhotra H, Steinman J, Prasad D, Podgorsak M Radiol Oncol. 2012; 45(2):132-42.

PMID: 22933947 PMC: 3423725. DOI: 10.2478/v10019-011-0012-9.