Comparative analysis of several detectors for the measurement of radiation transmission and leakage from a multileaf collimator
Por:
Lárraga-gutiérrez J.M., Galván De la Cruz O.O., García-garduño O.A., Ballesteros-zebadúa P.
Publicada:
1 ene 2014
Resumen:
The multileaf collimator (MLC) is the standard device used to shape radiation beams for 3-d conformal and intensity-modulated radiation therapy (IMRT). Due to the inherent properties of MLC, there is a small amount of radiation transmitted through the leaves, called radiation transmission (RT). Accurate measurements of this radiation are required to commission and validate IMRT-capable treatment planning systems because this radiation may impact the dosimetry of IMRT-calculated dose distributions. This work compares several detectors in the measurement of RT for a micro-multileaf collimation system. The results show that there are statistically significant differences in the measured RT values between detectors from 3.5 to 12.5% for the same MLC model and less than 0.2% relative to the isocentre dose for an open reference field. However, although small in magnitude, these differences may impact the dosimetry of IMRT treatment planning by up to 1.78Gy to the healthy tissue surrounding the target for a treatment of 60Gy in 30 fractions. By the later, these differences must be included as a source of uncertainty in IMRT dose delivery. Also, it must be established which detector offers the most reliable results in the measurement of the RT by using Monte Carlo simulation methods. © 2013 Associazione Italiana di Fisica Medica.
Filiaciones:
Lárraga-gutiérrez J.M.:
Laboratorio de Física Médica, Instituto Nacional de Neurología y Neurocirugía, Insurgentes Sur 3877, C.P. 14269, México D.F., Mexico
Unidad de Radioneurocirugía, Instituto Nacional de Neurología y Neurocirugía, Insurgentes Sur 3877, C.P. 14269, México, D.F., Mexico
Galván De la Cruz O.O.:
Unidad de Radioneurocirugía, Instituto Nacional de Neurología y Neurocirugía, Insurgentes Sur 3877, C.P. 14269, México, D.F., Mexico
García-garduño O.A.:
Laboratorio de Física Médica, Instituto Nacional de Neurología y Neurocirugía, Insurgentes Sur 3877, C.P. 14269, México D.F., Mexico
Unidad de Radioneurocirugía, Instituto Nacional de Neurología y Neurocirugía, Insurgentes Sur 3877, C.P. 14269, México, D.F., Mexico
Ballesteros-zebadúa P.:
Laboratorio de Física Médica, Instituto Nacional de Neurología y Neurocirugía, Insurgentes Sur 3877, C.P. 14269, México D.F., Mexico
Unidad de Radioneurocirugía, Instituto Nacional de Neurología y Neurocirugía, Insurgentes Sur 3877, C.P. 14269, México, D.F., Mexico
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