Publications by authors named "Michael A S Lamba"
Measurement of low-energy backscatter factors using GAFCHROMIC film and OSLDs.
J Appl Clin Med Phys
November 2012
Article Synopsis
- The study focuses on measuring radiation doses from low-voltage X-rays used in radiotherapy, specifically Grenz and superficial X-rays around 20 and 100 kVp.
- It explores different measurement methods, including standard ion chambers, GAFCHROMIC EBT2 film, and optically stimulated luminescent dosimeter (OSLD) crystals, to assess backscatter factors in that context.
- Findings reveal that the ion chamber method was the least accurate, while GAFCHROMIC films provided reliable results, and OSLDs showed good performance for smaller field sizes but increased response in larger ones; specific backscatter values were about 5% higher than standard recommendations.
The purpose of this study was to compare the peripheral doses to various organs from a typical head and neck intensity-modulated radiation therapy (IMRT) treatment delivered by linear accelerator (linac) and helical TomoTherapy. Multiple human CT data sets were used to segment critical structures and organs at risk, fused and adjusted to an anthropomorphic phantom. Eighteen contours were designated for thermoluminescent dosimeter (TLD) placement.
View Article and Find Full Text PDFThe purpose of this study was to present a theoretical analysis of how the presence of bone in interstitial brachytherapy affects dose rate distributions. This study was carried out using a Monte Carlo simulation of the dose distribution in homogeneous medium for 3 commonly used brachytherapy seeds. The 3 seeds investigated in this study are iridium-192 (192Ir) iodine-125 (125I), and palladium-103 (103Pd).
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