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Dose Uncertainty Due to Energy Dependence in Dual-energy Computed Tomography by Daisuke Kawahara; Takatoshi Toyoda; Kazushi Yokomachi; Chikako Fujioka; Yasushi Nagata is a scholarly article available to read on EtoBox.

What is Dose Uncertainty Due to Energy Dependence in Dual-energy Computed Tomography about?

## Purpose To evaluate the absolute dose uncertainty at 2 different energies and for the large and small bowtie filters in dual-energy computed tomography (DECT). ## Material and methods Measurements were performed using DECT at 80 kV and 140 kilovoltage peak (kVp), and single-energy computed tomography (CT) at 120 kV. The absolute dose was calculated from the mass-energy absorption obtained from the half-value layer (HVL) of aluminium. ## Results The difference in the water-to-air ratio of the mean mass energy-absorption coefficients at 80 kV and 140 kV was 2.0% for the small bow-tie filter and 3.0% for the large bow-tie filter. At lower tube voltages, the difference in the absorbed dose with the large and small bow-tie filters was larger. ## Conclusions The absolute dose uncertainty due to energy dependence was 3.0%, which could be reduced with single-energy beams at 120 kV or by using the average effective energy measurement with dual-energy beams.

Author

Daisuke Kawahara; Takatoshi Toyoda; Kazushi Yokomachi; Chikako Fujioka; Yasushi Nagata

Published

2023