Dosimetry of a Small-Animal Irradiation Model using a 6 MV Linear Accelerator
- Instituto de Fisica, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, C.P. 04510, Mexico, D.F. (Mexico)
- Laboratorio de Fisica Medica, Instituto Nacional de Neurologia y Neurocirugia. Insurgentes Sur 3677, Col. La Fama, C. P. 14269, Tlalpan, Mexico, D. F. (Mexico)
A custom made rat-like phantom was used to measure dose distributions using a 6 MV linear accelerator. The phantom has air cavities that simulate the lungs and cylindrical inserts that simulate the backbone. The calculated dose distributions were obtained with the BrainScan v.5.31 TPS software. For the irradiation two cases were considered: (a) near the region where the phantom has two air cavities that simulate the lungs, and (b) with an entirely uniform phantom. The treatment plan consisted of two circular cone arcs that imparted a 500 cGy dose to a simulated lesion in the backbone. We measured dose distributions using EBT2 GafChromic film and an Epson Perfection V750 scanner working in transmission mode. Vertical and horizontal profiles, isodose curves from 50 to 450 cGy, dose and distance to agreement (DTA) histograms and Gamma index were obtained to compare the dose distributions using DoseLab v4.11. As a result, these calculations show very good agreement between calculated and measured dose distribution in both cases. With a 2% 2 mm criteria 100% of the points pass the Gamma test for the uniform case, while 98.9% of the points do it for the lungs case.
- OSTI ID:
- 21506964
- Journal Information:
- AIP Conference Proceedings, Vol. 1310, Issue 1; Conference: 11. Mexican symposium on medical physics, Mexico City (Mexico), 19-22 Mar 2010; Other Information: DOI: 10.1063/1.3531582; (c) 2010 American Institute of Physics; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
Similar Records
SU-F-SPS-02: Accuracy of the Small Field Dosimetry Using the Monte Carlo and Sequential Dose Calculation Algorithms of Multiplan Treatment Planning System Within and Beyond Heterogeneous Media for Cyberknife M6 Unit
Evaluation of superficial dosimetry between treatment planning system and measurement for several breast cancer treatment techniques
Related Subjects
COLLIMATORS
COMPARATIVE EVALUATIONS
CYLINDRICAL CONFIGURATION
DIFFERENTIAL THERMAL ANALYSIS
DOSIMETRY
IRRADIATION
ISODOSE CURVES
LINEAR ACCELERATORS
LUNGS
PHANTOMS
RADIATION DOSE DISTRIBUTIONS
RADIOTHERAPY
RATS
SIMULATION
TRANSMISSION
ACCELERATORS
ANIMALS
BODY
CONFIGURATION
EVALUATION
MAMMALS
MEDICINE
MOCKUP
NUCLEAR MEDICINE
ORGANS
RADIOLOGY
RESPIRATORY SYSTEM
RODENTS
STRUCTURAL MODELS
THERAPY
THERMAL ANALYSIS
VERTEBRATES