Determination of small field synthetic single-crystal diamond detector correction factors for CyberKnife, Leksell Gamma Knife Perfexion and linear accelerator.

The aim of this study was to determine small field correction factors for a synthetic single-crystal diamond detector (PTW microDiamond) for routine use in clinical dosimetric measurements. Correction factors following small field Alfonso formalism were calculated by comparison of PTW microDiamond measured ratio MQclinfclin/MQmsrfmsr with Monte Carlo (MC) based field output factors ΩQclin,Qmsrfclin,fmsr determined using Dosimetry Diode E or with MC simulation itself. Diode measurements were used for the CyberKnife and Varian Clinac 2100C/D linear accelerator. PTW microDiamond correction factors for Leksell Gamma Knife (LGK) were derived using MC simulated reference values from the manufacturer. PTW microDiamond correction factors for CyberKnife field sizes 25-5 mm were mostly smaller than 1% (except for 2.9% for 5 mm Iris field and 1.4% for 7.5 mm fixed cone field). The correction of 0.1% and 2.0% for 8 mm and 4 mm collimators, respectively, needed to be applied to PTW microDiamond measurements for LGK Perfexion. Finally, PTW microDiamond MQclinfclin/MQmsrfmsr for the linear accelerator varied from MC corrected Dosimetry Diode data by less than 0.5% (except for 1 × 1 cm2 field size with 1.3% deviation). Regarding low resulting correction factor values, the PTW microDiamond detector may be considered an almost ideal tool for relative small field dosimetry in a large variety of stereotactic and radiosurgery treatment devices.

Veselsky T ，Novotny J Jr ，Pastykova V ，Koniarova I ... -  《-》

Monte Carlo calculated correction factors for the PTW microDiamond detector in the Gamma Knife-Model C.

Barrett JC ，Knill C 《-》

Dosimetry of cone-defined stereotactic radiosurgery fields with a commercial synthetic diamond detector.

Morales JE ，Crowe SB ，Hill R ，Freeman N ，Trapp JV ... -  《-》

Determination of the KQclinfclin,Qmsr fmsr correction factors for detectors used with an 800 MU/min CyberKnife(®) system equipped with fixed collimators and a study of detector response to small photon beams using a Monte Carlo method.

Moignier C ，Huet C ，Makovicka L 《-》

Evaluation of a synthetic single-crystal diamond detector for relative dosimetry on the Leksell Gamma Knife Perfexion radiosurgery system.

Mancosu P ，Reggiori G ，Stravato A ，Gaudino A ，Lobefalo F ，Palumbo V ，Navarria P ，Ascolese A ，Picozzi P ，Marinelli M ，Verona-Rinati G ，Tomatis S ，Scorsetti M ... -  《-》