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Updated: Feb 5, 2026

X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
Published on: September 11, 2011
Comparison of manual and dose reduction modes of a MORITA R100 CBCT
Dennis Rottke1,2, Julia Dreger1, Kunihiko Sawada3
11 Digital Diagnostic Center , Freiburg im Breisgau , Germany.
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.
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