Radiation properties and dosimetric insights of Nylon CT phantoms: Advanced computational analysis using Phy-X, XCOM, and GATE/GEANT4
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This study investigates the potential of Nylon as a cost-effective alternative to polymethyl methacrylate (PMMA) phantoms for computed tomography (CT) dosimetry in resource-limited settings. Nylon’s radiation interaction properties, including mass attenuation coefficients, effective atomic numbers, and electron densities, were analyzed across the diagnostic energy range (1–150 keV) using Phy-X and XCOM computational frameworks. Monte Carlo simulations with GATE/GEANT4 validated these results by mapping dose distributions at tube voltages of 80, 110, and 130 kVp. Dosimetric performance was analyzed by comparing computed tomography dose index (CTDI) values for Nylon and PMMA phantoms. Nylon exhibited strong tissue equivalence, with deviations from water reducing from − 3.8 % to − 2.0 % within the CT diagnostic range and consistent differences with PMMA (+1.1 % to +1.4 %). CTDI values for Nylon were systematically lower: 2.73 vs. 2.9 mGy (− 5.86 %) at 80 kVp, 6.51 vs. 6.78 mGy (− 3.98 %) at 110 kVp, and 9.74 vs. 10.15 mGy (− 4.04 %) at 130 kVp. Adjustment factors between 1.041 and 1.062 enable conversion between Nylon and PMMA. These findings confirm Nylon as a viable and affordable alternative for CT dosimetry. Its dosimetric performance and radiation interaction properties support its use in maintaining quality assurance in CT imaging in resource-constrained environments
Abstract
This study investigates the potential of Nylon as a cost-effective alternative to polymethyl methacrylate (PMMA) phantoms for computed tomography (CT) dosimetry in resource-limited settings. Nylon’s radiation interaction properties, including mass attenuation coefficients, effective atomic numbers, and electron densities, were analyzed across the diagnostic energy range (1–150 keV) using Phy-X and XCOM computational frameworks. Monte Carlo simulations with GATE/GEANT4 validated these results by mapping dose distributions at tube voltages of 80, 110, and 130 kVp. Dosimetric performance was analyzed by comparing computed tomography dose index (CTDI) values for Nylon and PMMA phantoms. Nylon exhibited strong tissue equivalence, with deviations from water reducing from − 3.8 % to − 2.0 % within the CT diagnostic range and consistent differences with PMMA (+1.1 % to +1.4 %). CTDI values for Nylon were systematically lower: 2.73 vs. 2.9 mGy (− 5.86 %) at 80 kVp, 6.51 vs. 6.78 mGy (− 3.98 %) at 110 kVp, and 9.74 vs. 10.15 mGy (− 4.04 %) at 130 kVp. Adjustment factors between 1.041 and 1.062 enable conversion between Nylon and PMMA. These findings confirm Nylon as a viable and affordable alternative for CT dosimetry. Its dosimetric performance and radiation interaction properties support its use in maintaining quality assurance in CT imaging in resource-constrained environments