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KMID : 1151820210150060869
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Journal of the Korean Society of Radiology
2021 Volume.15 No. 6 p.869 ~ p.875
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Derivation of the Effective Energy Calculation Formula of the X-ray Beam Generated by the CT Simulator
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Kim Jong-Eon
Lee Sang-Hun
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Abstract
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The purpose of this study is to derive a formula for calculating the effective energy of an X-ray beam generated by a CT simulator. Under 90, 120, and 140 kVp X-ray beams, the CT number calibration insert part of the AAPM CT performance phantom was scanned 5 times with a CT simulator. The CT numbers of polyethylene, polystyrene, water, nylon, polycarbonate, and acrylic were measured for each CT slice image. The average value of CT number measured under a single tube voltage and the linear attenuation coefficients corresponding to each photon energy calculated from the data of the National Institute of Standards and Technology were linearly fitted. Among the obtained correlation coefficients, the photon energy having the maximum value was determined as the effective energy. In this way, the effective energy of the X-ray beam generated at each tube voltage was determined. By linearly fitting the determined effective energies(y) and tube voltages(x), y=0.33026x+30.80263 as an effective energy calculation formula was induced.
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KEYWORD
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CT number , Tube voltage , Effective energy , CT simulator
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