Dosimetric characteristics of Novalis shaped beam surgery unit.
The dosimetric characteristics of a new dedicated radiosurgical treatment unit are systematically measured in terms of its percent depth dose, beam profile, and relative scatter factor. High-resolution diode detector, mini-ion-chamber detector, and conventional Kodak XV films are used to measure dosimetric data for a range of field sizes from 6x6 mm to 100x100 mm. The effects of collimator size, micro-multileaf collimator shape, and detector type on the dosimetric data are investigated. Results indicate that, with careful design, accurate dosimetric data could be acquired using either a dedicated diode detector or a mini-ion-chamber detector, and film detector. Special attention is required when measuring dosimetric data for small field sizes such as 6x6 mm.
Department of Radiation Oncology, Henry Ford Hospital, Detroit, Michigan 48202, USA. fyin1@hfhs.org
Fang-Fang
FF
Yin
Jingeng
J
Zhu
Hui
H
Yan
Haiqun
H
Gaun
Rabih
R
Hammoud
Samuel
S
Ryu
Jae H
JH
Kim
D019544:Equipment Failure Analysis / Q000379:methods; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods*; D016634:Radiosurgery / Q000295:instrumentation*; D011880:Radiotherapy Planning, Computer-Assisted / Q000295:instrumentation / Q000379:methods; D020266:Radiotherapy, Conformal / Q000295:instrumentation / Q000379:methods*; D011882:Radiotherapy, High-Energy / Q000295:instrumentation* / Q000379:methods*; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D012666:Semiconductors; D012680:Sensitivity and Specificity