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Journal of Radiography & Radiation Sciences

2007;  (v 21): 1-11

 

An Evaluation of Some Common Laboratory Materials by X-Ray Attenuation, for use as Human Tissue Substitutes

Egbe NO, Nneoyi-Egbe AF, Inyang SO, Azogor WE.

Copyright © 2017 The Association Of Radiographers Of Nigeria. All Rights Reserved.

This work is licensed under the Creative Commons Attribution International License (CC BY).
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To develop readily available laboratory materials for probable use as imaging phantoms or test objects, Laboratory Magnesium Sulphate (MgSO4) and Table salt (NaCl) were used in the ratio 80:20% by weight with paraffin wax to form test materials (MgSO4:PW1) and (NaCl:PW2). Rice powder, gelatine separately, and a combination of gelatine (20g in 100ml of warm water) and 100g rice powder were also made into test objects. The ratios used were confirmed by matching different constituents by weight of the test samples with the web based photon interaction software XCOM designed by the National Institute of Science and Technology, USA, to obtain close matching with tissue data. Each test object was made into 1 cm blocks for exposure to narrow beam x-rays over the diagnostic energy range (50 – 150kV) under automatic exposure conditions. Good agreement within 10%, was found between the measured and calculated values for four of the five tested samples. Matching of the tested materials with mass attenuation coefficients of simulated tissue showed acceptable match at high photon energies of 0.04 – 0,05 MeV and above for gelatine, PW1 (paraffin wax + MgSO4.6H2O) and Rigel (Rice + gelatine). These materials can therefore be used as tissue substitutes in image quality studies.

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