Commissioning Procedures for Mechanical Precision and Accuracy in a Dedicated LINAC
- Unidad de Radiocirugia, Instituto Nacional de Neurologia y Neurocirugia Insurgentes Sur 3677. Col. La Fama, C.P., Laboratorio de Fisica Medica, Instituto Nacional de Neurologia y Neurocirugia Insurgentes Sur 3677. Col. La Fama, C.P. (Mexico)
- Unidad de Radiocirugia, Instituto Nacional de Neurologia y Neurocirugia Insurgentes Sur 3677. Col. La Fama, C.P. (Mexico)
Mechanical precision measurements are fundamental procedures for the commissioning of a dedicated LINAC. At our Radioneurosurgery Unit, these procedures can be suitable as quality assurance routines that allow the verification of the equipment geometrical accuracy and precision. In this work mechanical tests were performed for gantry and table rotation, obtaining mean associated uncertainties of 0.3 mm and 0.71 mm, respectively. Using an anthropomorphic phantom and a series of localized surface markers, isocenter accuracy showed to be smaller than 0.86 mm for radiosurgery procedures and 0.95 mm for fractionated treatments with mask. All uncertainties were below tolerances. The highest contribution to mechanical variations is due to table rotation, so it is important to correct variations using a localization frame with printed overlays. Mechanical precision knowledge would allow to consider the statistical errors in the treatment planning volume margins.
- OSTI ID:
- 21149281
- Journal Information:
- AIP Conference Proceedings, Vol. 1032, Issue 1; Conference: 10. Mexican symposium on medical physics, Mexico City (Mexico), 17-19 Mar 2008; Other Information: DOI: 10.1063/1.2979280; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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