Analysis of the Attenuation Coefficient of Composite Silicone Rubber and Gliceryn for Soft Tissue Phantom Applications

Document Type: Original Paper

Authors

1 Department of Physics, Hasanuddin University

2 Physics Department, Hasanuddin University, Makassar Indonesia

3 Department of Physics, Hasanuddin university

4 Department of Physics, Gadjah Mada University

Abstract

Introduction: Phantom is an object that can be used for study to find high accuracy position of the radiation dose. Phantom produced from combination of the silicone rubber as a matrix and glycerin as a filler to form composite for replaced the human soft tissue. The composite were carried out by using CT Simulator for determining the attenuation coefficient which was dependent on the X-ray energy and the effective atomic number of absorber.
Material and Methods: Phantom has been synthesized from silicone rubber without and with additional of glycerin 10% and 20%. The type of silicone rubber in this study is Room Temperature Vulcanized (RTV) 52 with blue catalyst by a ratio of 100:5 (wt%). Samples were scanned by using CT simulator to obtain the images and then exported to the eclipse treatment planning system for analysis. The region of interest (ROI) is in the center of an area of 50 x 50 pixels was given in the image to determining the CT number.
Results: The ROI results for the sample without and by additional glycerin 10% and 20% resulting the CT values are 287.4 HU, 280.5 HU and 225.2 HU, respectively which were in the range of the human soft tissue. Attenuation coefficients of the three samples are 0.239 cm-1 for without glycerin, 0.238  0.001 cm-1 for 10% glycerin and 0.233  0.001 cm-1 for 20% glycerin. The value of half value layer (HVL) is 2.902  0.001 cm, 2.911  0.001 cm and 2.980  0.001 cm, respectively for phantom without glycerin and with 10% and 20% of glycerin.
Conclusion: Phantoms in this study shows high potentials as an objects of research in radiotherapy and educational purposes. In this study shows the best composition for study of human liver is composite with 20% glycerin.

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Articles in Press, Accepted Manuscript
Available Online from 24 April 2019
  • Receive Date: 08 March 2019
  • Revise Date: 12 April 2019
  • Accept Date: 24 April 2019