Validation of a calculation algorithm for organ doses in the existing CT dosimetry tools using paediatric anthropomorphic phantom measurements

Background: Rapid and user-friendly software tools for individual estimates of organ doses in CT are of the utmost importance to support the professionals in the choice of the appropriate imaging modalities. Most CT-dosimetry tools, like CT Expo [1], CT Dosimetry [2], as well as a new dosimetry tool [3], rely on the assumption that organ doses estimated for one CT scanner can be converted to other CT scanner using the ratio of the Computed Tomography Dose Index (CTDI) between two CT scanners. We tested this assumption for paediatric patients using physical phantom measurements for various protocols and CT scanners. Measurements were compared with dosimetry tools.