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03.08.2018 | Original Article

Diagnostic accuracy of third-generation dual-source dual-energy CT: a prospective trial and protocol for clinical implementation

verfasst von: Tim Nestler, Kai Nestler, Andreas Neisius, Hendrik Isbarn, Christopher Netsch, Stephan Waldeck, Hans U. Schmelz, Christian Ruf

Erschienen in: World Journal of Urology | Ausgabe 4/2019

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Abstract

Purpose

Uric acid (UA) calculi can be referred to chemolitholysis rather than invasive treatment. Dual-energy computed tomography (DECT) may be able to distinguish between UA and non-UA (NUA) calculi. The aim of this study was to evaluate the validity of third-generation DECT for the first time and to investigate whether combining DECT with clinical parameters can increase its predictive accuracy.

Materials and methods

All patients who presented to our emergency department between January 2015 and March 2017 with urinary stones were prospectively included in this observational study and underwent DECT with subsequent interventional stone removal. Stone composition was analyzed using infrared spectrometry as the gold standard. Predictive accuracy of DECT and clinical covariates was computed by assessing univariate and multivariate areas under the curve (AUCs).

Results

Of 84 patients with 144 urinary stones, 10 (11.9%) patients had UA stones according to infrared spectrometry, and the remaining stones were NUA or mixed stones. DECT had a positive predictive value of 100% and a negative predictive value of 98.5% for UA stones. The AUC for urine pH alone was 0.71 and 0.97 for DECT plus urine pH. No UA stones were found in patients with a urine pH above > 5.5. Mean DLP was 225.15 ± 128.60 mGy*cm and mean effective dose was 3.38 ± 1.93 mSv.

Conclusions

DECT is a safe method for assigning patients to oral chemolitholysis. Clinical preselection of patients based on urinary pH (< 6.0) leads to a more liable use of DECT. Third-generation DECT needs significant lower radiation doses compared to previous generations.

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Titel: Diagnostic accuracy of third-generation dual-source dual-energy CT: a prospective trial and protocol for clinical implementation
verfasst von: Tim Nestler
Kai Nestler
Andreas Neisius
Hendrik Isbarn
Christopher Netsch
Stephan Waldeck
Hans U. Schmelz
Christian Ruf
Publikationsdatum: 03.08.2018
Verlag: Springer Berlin Heidelberg
Erschienen in: World Journal of Urology / Ausgabe 4/2019
Print ISSN: 0724-4983
Elektronische ISSN: 1433-8726
DOI: https://doi.org/10.1007/s00345-018-2430-4

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Materials and methods

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