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KMID : 1151820170110060501
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Journal of the Korean Society of Radiology
2017 Volume.11 No. 6 p.501 ~ p.508
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The Dependence of CT Scanning Parameters on CT Number to Physical Density Conversion for CT Image Based Radiation Treatment Planning System
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Baek Min-Gyu
Kim Jong-Eon
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Abstract
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The dependence of CT scanning parameters on the CT number to physical density conversion from the CT image of CT and CBCT electron density phantom acquired by the CT scanner using in radiotherapy were analyzed by experiment. The CT numbers were independent of the tube current product exposure time, slice thickness, filter of image reconstruction, field of view and volume of phantom. But the CT numbers were dependent on the tube voltage and cross section of phantom. As a result, for physical density range above 0, the maximum CT number difference observed at the tube voltage between 90 and 120 kVp was 27%, and the maximum CT number difference observed between CT body and head electron density phantom was 15%.
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KEYWORD
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CT scanner, CT number, Electron densvity phantom, Physical density, Tube voltage
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