The effect of tube voltage combination on image artefact and radiation dose in dual-source dual-energy CT: comparison between conventional 80/140 kV and 80/150 kV plus tin filter for gout protocol
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In dual-source CT, dual-energy (DE) performance is affected by various X-ray tube voltage combinations with and without tin filter (Sn). The purpose of this study was to assess the utility of the 80/150 Sn kV voltage combination in terms of image artefact and radiation dose for DECT gout protocol, compared with the conventional 80/140 kV.
Seventy-four patients with suspected gout who underwent dual-source DECT examinations scanned at 80/140 kV (n = 37) and at 80/150 Sn kV (n = 37) were included. Patients’ age, sex, and serum uric acid levels were matched between the two groups. The types and incidence of image artefacts and radiation dose were evaluated.
The 80/150 Sn kV group had significantly fewer patients with artefacts, compared to the 80/140 kV group [11 (30 %) of 37 vs 35 (94.6 %) of 37, p < 0.001]. Except for the motion artefact, the rest of the artefacts—skin, nail bed, submillimetre, motion, vascular, beam-hardening, clumpy artefact along tendon—were significantly less observed in the 80/150 Sn kV acquisitions. The dose-length product (DLP) and effective dose were significantly lower for the 80/150 Sn kV acquisitions compared with the 8s0/140 kV scans (DLP: 104.46 ± 10.66 mGy·cm vs 344.70 ± 56.39 mGy·cm, p < 0.001; effective dose: 1.04 ± 0.11 mSv vs 3.45 ± 0.56 mSv, p < 0.001).
The 80/150 Sn kV voltage combination in dual-source DECT system could be used as one of the artefact reduction methods while reducing radiation dose for gout protocol when compared to the conventional 80/140 kV.
• DECT has emerged as the leading modality for non-invasive diagnosis of gout.
• Various X-ray tube voltage combinations are now feasible in dual-source DECT.
• The 80/150 Sn kV acquisition could facilitate artefact reduction in gout protocol.
KeywordsGout Tomography, X-ray computed Tin Artefacts Radiation dosage
American College of Rheumatology/European League Against Rheumatism
CT dose index
Monosodium urate monohydrate
This work was supported by the Gachon University research fund of 2017 (GCU-2017-5259).
This study has received funding by the Gachon University Research Center, Incheon, South Korea (GCU-2017-5259).
Compliance with ethical standards
The scientific guarantor of this publication is Ji Young Jeon, M.D.
Conflict of interest
The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.
Statistics and biometry
No complex statistical methods were necessary for this paper.
Written informed consent was waived by the Institutional Review Board.
Institutional Review Board approval was obtained.
• case-control study/observational
• performed at one institution
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