Radiation Dose Evaluation in 3D Rotation Angiography and Cone-beam Computed Tomography with a Flat Panel Detector

The aim of this study was to evaluate radiation dose in patients undergoing three-dimensional rotation angiography (3DRA) and cone-beam computed tomography (CBCT) using a flat panel detector (FPD). Radiation doses were measured for angiography equipment using small silicon-photodiode dosimeters that were implanted in various positions in tissues and organs within an anthropomorphic phantom of a standard Japanese adult male. Output signals from the dosimeters were read out on a computer, from which organ and effective doses were calculated according to guidelines published in International Commission on Radiological Protection Publication 103. Lens doses and effective doses obtained in this study were 1.6 mGy and 0.13 mSv for 3DRA, 20 mGy and 1.7 mSv for CBCT (normal mode). 3DRA provided substantial lens doses and effective dose reduction, which were 8% of the doses in CBCT (normal mode).