Abstract
The objective of this investigation was to assess the computed tomography dose index (CTDI) for various tube potentials utilizing epoxy and polyester-resin phantoms, and compare the results to those obtained from a standard polymethyl methacrylate (PMMA) phantom, employing the GEANT4/GATE simulation framework. Three cylindrical phantoms with a diameter of 32 cm were simulated from epoxy resin, polyester resin and PMMA. The phantoms were analyzed for their atomic composition, effective atomic number, electron density, and mass density. The weighted CTDI (CTDIw) was calculated for each phantom at 80, 110 and 130 kV tube potentials based on measurements of the CTDI100, c and CTDI100, p. The results demonstrated that the CTDIw values of the epoxy and polyester phantoms were dependent on the tube potential and exhibited similar trends to the PMMA phantom. The maximum discrepancy in CTDIw between the epoxy and PMMA phantoms was 3%, while the maximum difference in CTDIw between the polyester and PMMA phantoms was 2%. Therefore, the researchers concluded that the physical properties of the resin materials were comparable to PMMA, and the phantoms displayed equivalent dosimetry behavior to the PMMA phantom at all tube potentials. This study determined that epoxy and polyester resin phantoms exhibited commensurate radiation dosimetry to a standard PMMA phantom for assessing CT dose. As such, the epoxy and polyester resin phantoms may be considered as a suitable substitute for the PMMA phantom when it is not readily available.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
