Dennis Rottke1,2, Julia Dreger1, Kunihiko Sawada3, Kazuya Honda3, Dirk Schulze1. 1. 1 Digital Diagnostic Center , Freiburg im Breisgau , Germany. 2. 2 Department of Odontology, Oral and Maxillofacial Radiology, Faculty of Medicine, Umeå University , Umeå , Sweden. 3. 3 Department of Radiology, Nihon University School of Dentistry , Tokyo , Japan.
Abstract
OBJECTIVE: : To compare effective dose differences when acquiring (1) dose reduction mode and (2) manual mode in a MORITA R100 CBCT. METHODS: : 24 exposure protocols with different technique factors were performed in both the dose reduction mode and the manual mode in a Veraviewepocs 3D R100 cone beam CT device. 48 TLD were placed in a RANDO head phantom at 24 different sites. Effective doses were calculated according to the formalism published in the 103rd ICRP report. RESULTS: : Effective doses for the dose reduction mode protocols ranged from 14 to 156 µSv [mean = 57 µSv, standard deviation (SD) = 37 µSv], whereas effective doses for the manual mode protocols ranged from 22 to 267 µSv (mean = 94 µSv, SD = 65 µSv). Thus, across all protocols, the dose reduction mode leads to a drop of the effective dose by 38 % (SD = 6 %). CONCLUSIONS: : The estimated effective doses are significantly lower if dose reduction protocols are acquired.
OBJECTIVE: : To compare effective dose differences when acquiring (1) dose reduction mode and (2) manual mode in a MORITA R100 CBCT. METHODS: : 24 exposure protocols with different technique factors were performed in both the dose reduction mode and the manual mode in a Veraviewepocs 3D R100 cone beam CT device. 48 TLD were placed in a RANDO head phantom at 24 different sites. Effective doses were calculated according to the formalism published in the 103rd ICRP report. RESULTS: : Effective doses for the dose reduction mode protocols ranged from 14 to 156 µSv [mean = 57 µSv, standard deviation (SD) = 37 µSv], whereas effective doses for the manual mode protocols ranged from 22 to 267 µSv (mean = 94 µSv, SD = 65 µSv). Thus, across all protocols, the dose reduction mode leads to a drop of the effective dose by 38 % (SD = 6 %). CONCLUSIONS: : The estimated effective doses are significantly lower if dose reduction protocols are acquired.