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European Radiology
Published in: European Radiology 3/2019

01-03-2019 | Musculoskeletal

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

Authors: Ji Young Jeon, Sheen-Woo Lee, Yu Mi Jeong, Han Joo Baek

Published in: European Radiology | Issue 3/2019

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Abstract

Objectives

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.

Methods

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.

Results

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).

Conclusions

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.

Key Points

• 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.
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Metadata
Title
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
Authors
Ji Young Jeon
Sheen-Woo Lee
Yu Mi Jeong
Han Joo Baek
Publication date
01-03-2019
Publisher
Springer Berlin Heidelberg
Published in
European Radiology / Issue 3/2019
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-018-5622-9

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