• Lubis, Lukmanda Evan
• Najmah, Windi Dliya
• Muliyanti, Yuni
• Hariyati, Ika
• Mart, Terry
• Bosmans, Hilde
• Ryangga, Dea
• Soejoko, Djarwani Soeharso

Abstract

<jats:p>This article aims to present the development, construction, and evaluation of an alternative computed tomography dose index (CTDI) phantom. Epoxy resin was mixed with an iodine-based contrast agent to produce radiological characteristics resembling polymethyl methacrylate (PMMA) as a standard CTDI phantom. As a preliminary study, testing was carried out using computed tomography images (80 and 120 kVp) on 12 variations of epoxy-iodine resin mixtures to obtain relative electron density (<jats:italic toggle="yes">ρe</jats:italic>) values and effective atomic numbers (<jats:italic toggle="yes">Zeff</jats:italic>) of the samples. The alternative CTDI phantoms were then constructed with a resin-iodine mixture using iodine concentrations that yield on closest <jats:italic toggle="yes">ρe</jats:italic> and <jats:italic toggle="yes">Zeff</jats:italic> values to those of PMMA. The evaluation was carried out by comparing dose measurement results at various energies between the alternative phantom and the International Electrotechnical Commission-standard CTDI phantom. At a concentration of 0.46%, the epoxy resin has <jats:italic toggle="yes">ρe</jats:italic> and <jats:italic toggle="yes">Zeff</jats:italic> with a deviation against PMMA of 0.12% and 1.58%, respectively, so that composition was chosen for the alternative CTDI phantom construction. The average dose discrepancy values were 5% and 1%, respectively, for the head and body phantoms in the tested tube voltages of 80 kVp, 100 kVp, 120 kVp, and 135 kVp. The Student’s <jats:italic toggle="yes">t</jats:italic>-test result between the alternative and the standard phantoms also showed <jats:italic toggle="yes">P</jats:italic> &lt; 0.05, indicating the comparability of the alternative CTDI phantom with the standard CTDI phantom.</jats:p>

Topics

• density
• tomography
• resin
• dosimetry