Iranian Journal of Medical Physics

Iranian Journal of Medical Physics

Tissue Substitute Materials for the Human Colorectal Cancer Tissue

Document Type : Original Paper

Authors
Emmanuel Okon Esien-umo 1
Joseph Abebe Obu 2
Ndubuisi Ozoemena Chiaghanam 3
Akwa Egom Erim 4
Nneoyi Onen Egbe 5
1 Department of Radiography and Radiological Science, Faculty of Allied Medical Sciences, University of Calabar, Calabar, Cross River State
2 Department of Physics, Faculty of Physical Sciences, University of Calabar
3 Department of Radiography and Radiological Science, University of Calabar, Calabar-Nigeria
4 Department of Radiography and Radiological science, Faculty of allied medical sciences, University of Calabar, Calabar, Cross River State, Nigeria
5 Department of Radiography & Radiological Science, University of Calabar, Nigeria
10.22038/ijmp.2022.64221.2099
Abstract
Introduction: Due to the high radiation dose used in radiotherapy, the human tissue is usually replaced with tissue substitutes in order to develop new treatment techniques. Tissue substitutes have not been reported for colorectal cancer tissue (CRC). This study aims at developing tissue substitutes for the CRC tissue with respect to the mass attenuation (µm) and mass energy absorption coefficients (µen/ρ) within the energy range of 6 – 15MV.
Material and Methods: Colorectal cancer tissue and four locally sourced materials namely beeswax, gelatine, rice powder, clay, and their mixtures – Clarice, gelarice, gelaclay, and bewaclay were subjected to Rutherford Backscattering Spectrometry (RBS) to determine their elemental composition. Results from the RBS were used in XCOM, a web-based photon interaction software designed by the National Institute of Standards and Technology, USA to determine their theoretical µm and µen/ρ values. Again, these materials were exposed to a narrow beam of x-rays at energies of 6 and 15MV to obtain their experimental µm and µen/ρ values.
Results: Revealed that the ratio of CRC tissue to the test materials ranged from 0.946 (beeswax) to 1.07 (clay) for both theoretical and experimental values with bewaclay having a ratio of 1.01 compared with 1.00 for CRC and a p = 0.541 and p = 0.663 with respect to µm and µen/ρ respectively.
Conclusion: Bewaclay with the closest match can be used as a tissue substitute for the CRC tissue between
6 – 9MV with respect to µm and µen/ρ as parameters for matching.
Keywords
Mass Attenuation Coefficient
Mass Energy Absorption Coefficient
Radiotherapy
Cancer
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Iranian Journal of Medical Physics
Volume 20, Issue 3
May and June 2023
Pages 136-145

  • Receive Date 08 March 2022
  • Revise Date 09 June 2022
  • Accept Date 26 June 2022