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- W2073526088 abstract "Purpose: To measure surface dose in CT exam using isotropic high sensitivity MOSFET dosimeters calibrated by Monte Carlo(MC) simulations. Method and Materials: The EGSnrc MC code was used to model the x‐ray source of a Phillips PQ5000 CT simulator for energies ranging from 80 – 140 kVp. Half‐value layers and profiles measured in air were used as a means of validation for the CT x‐ray source model. A model of the MOSFET was build which allowed us to simulate their energy response. The MOSFET dosimeters (Thomson and Nielsen) were calibrated on the surface of a CTDI head phantom by comparing the measured dose (mV) to the calculated dose (mGy) in a voxel at the surface. Surface dose measurements were carried out on the CTDI phantom and compared with dose calculations. Results: The agreement between the simulated and measured HVL is within 2.2% over the whole kVp and filtration range. The measured and simulated profiles are within 3% up to 14 cm off‐axis and within 7.2 % over the full fan beam width considered in this study. Simulated and measuredMOSFET energy response in‐air are within 5.4 % over 80–140 kVp range. The MOSFET exhibit an over‐response of about 10 % at 80 kVp compared to 140 kVp. Discrepancies between measured and calculated surface dose on the CTDI phantom increase as we move away from the point of dose normalization. Conclusion:MOSFET dosimeters offer a fast and easy means of accurately measuring surface dose in CT examinations." @default.
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- W2073526088 date "2005-06-23" @default.
- W2073526088 modified "2023-09-26" @default.
- W2073526088 title "Sci-PM Fri - 08: Accurate surface dose measurements in CT exam using isotropic high sensitivity MOSFET dosimeters calibrated by Monte Carlo simulations" @default.
- W2073526088 doi "https://doi.org/10.1118/1.2031040" @default.
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