Laser CT evaluation on normoxic PAGAT gel dosimeter

D. S. Kumar, E. J J Samuel, Y. Watanabe

Research output: Contribution to journalArticlepeer-review


Optical computed tomography has been shown to be a potentially useful imaging tool for the radiation therapy physicists. In radiation therapy, researchers have used optical CT for the readout of 3D dosimeters. The purpose of this paper is to describe the initial evaluation of a newly fabricated laser CT scanner for 3D gel dosimetry which works using the first generation principle. A normoxic PAGAT (Polyacrylamide Gelatin and Tetrakis) gel is used as a dosimeter for this analysis. When a laser passes through the gel phantom, absorption and scattering of photon take place. The optical attenuation coefficient of the laser can be obtained by measuring its intensity after passing through the gel by a sensor. The scanner motion is controlled by a computer program written in Microsoft Visual C++. Reconstruction and data analysis on the irradiated gel phantom is performed by suitable algorithm using Matlab software.

Original languageEnglish (US)
Article number012060
Pages (from-to)012060-012060
JournalJournal of Physics: Conference Series
Issue number1
StatePublished - 2013
Event7th International Conference on 3D Radiation Dosimetry, IC3DDose 2012 - Sydney, NSW, Australia
Duration: Dec 4 2012Dec 8 2012


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