GATE simulations of CTDI for patient dose

Chang-Lae Lee; Hee-Joung Kim; Hyo-Min Cho; Hye-Suk Park; A-Ram Yoo

doi:10.1117/12.811544

13 March 2009 GATE simulations of CTDI for patient dose

Chang-Lae Lee, Hee-Joung Kim, Hyo-Min Cho, Hye-Suk Park, A-Ram Yoo

Author Affiliations +

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72584V (2009) https://doi.org/10.1117/12.811544
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

The purpose of this study was to demonstrate CTDI estimation using GATE simulations, and to extend its techniques to various CT applications. We simulated various phantom sizes to estimate CTDI100 values for different patients. The simulations were performed using a single axial scan using standard PMMA (polymethylmethacrylate) head and body phantoms. Simulations of exposure in air were performed to compare simulated results with physically measured data. Simulations of absorbed dose in PMMA digital phantoms were performed to compare simulated results with physically measured data in corresponding PMMA physical phantoms at 5 different positions (at center, and 12hr, 3hr, 6hr, 9hr positions in phantoms). Additional simulations were performed for PMMA digital phantoms of various diameters (1-50 cm) at various kVp (80, 100, 120, 140 kVp) and mAs (100, 200, 300, 400 mAs) levels. For the PMMA head and body phantoms, the results of simulations showed an agreement with measured data by a maximum percent difference of 8.3% (head), 4.2% (body) for all energies applied. For the different positions, the results of simulations showed an agreement with measured data by a maximum per position difference of 4.7% (head), 5.1% (body) for 120 kVp. Within these limitations, for both various kVp and mAs levels, the results showed that CTDI100 values nonlinearly decreased as a function of diameter. For various diameters, the results showed that the CTDI100 values nonlinearly and linearly increased as a function of kVp and mAs, respectively.

Citation Download Citation

Chang-Lae Lee, Hee-Joung Kim, Hyo-Min Cho, Hye-Suk Park, and A-Ram Yoo "GATE simulations of CTDI for patient dose", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72584V (13 March 2009); https://doi.org/10.1117/12.811544

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