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1/2023
vol. 88 Chest radiology
abstract:
Original paper
Dose uncertainty due to energy dependence in dual-energy computed tomography
Daisuke Kawahara
1
,
Takatoshi Toyoda
2
,
Kazushi Yokomachi
2
,
Chikako Fujioka
2
,
Yasushi Nagata
1, 3
1.
Department of Radiation Oncology, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima City, Japan
2.
Radiation Therapy Section, Division of Clinical Support, Hiroshima University Hospital, Hiroshima City, Japan
3.
Hiroshima High-Precision Radiotherapy Cancer Centre, Hiroshima City, Japan
© Pol J Radiol 2023; 88: e270-e274
Online publish date: 2023/06/07
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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. keywords:
dual-energy CT, energy absorption coefficient |
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