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The purpose of this study is to develop a new and simple methodology for calculating mean size-specific dose estimates (SSDE) over the entire scan range (mSSDE) from weight and volume… Click to show full abstract
The purpose of this study is to develop a new and simple methodology for calculating mean size-specific dose estimates (SSDE) over the entire scan range (mSSDE) from weight and volume CT dose index (CTDIvol). We retrospectively analyzed data from a dose index registry. Scan areas were divided into two regions: chest and abdomen-pelvis. The original mSSDE was calculated by a commercially available software. The conversion formulas for mSSDE were estimated from weight and CTDIvol (SSDEweight) in each region. SSDEweight were compared with the original mSSDE using Bland-Altman analysis. Root mean square differences were 1.4 mGy for chest and 1.5 mGy for abdomen-pelvis. Our method using formulae can calculate SSDEweight using weight and CTDIvol without a dedicated software, and can be used to calculate DRL to optimize CT exposure doses.
Journal Title: Radiation Protection Dosimetry
Year Published: 2018
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