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25.09.2017 | Original Article

CT-calculometry (CT-CM): advanced NCCT post-processing to investigate urinary calculi

verfasst von: Valentin Zumstein, Patrick Betschart, Lukas Hechelhammer, Hans-Peter Schmid, Dominik Abt, Magdalena Müller-Gerbl

Erschienen in: World Journal of Urology | Ausgabe 1/2018

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Abstract

Purpose

This study aimed at evaluating the potential of CT-calculometry (CT-CM) as a novel method to determine mineralisation, composition, homogeneity and volume of urinary calculi based on preoperative non-contrast-enhanced computed tomography (NCCT) scans.

Materials and methods

CT-CM was performed in preoperative NCCTs of 25 patients treated for upper tract urinary calculi by ureterorenoscopy or percutaneous nephrolithotomy. Absolute mineralisation values were achieved by use of quantitative CT-osteoabsorptiometry and compared to Fourier infrared spectroscopy as a reference for stone composition. Homogeneity was assessed by advanced software-based NCCT post-processing and visualised by using a maximum intensity projection algorithm. Volumetric measurement was performed by software-based three-dimensional reconstruction.

Results

CT-CM was feasible in all of the 25 NCCTs. Absolute mineralisation values calculated by quantitative CT-OAM might be used to identify the most frequent stone types. High levels of inhomogeneity could be detected even in pure component stones. Volumetric measurement could be performed with minimal effort.

Conclusions

CT-CM is based on advanced NCCT post-processing software and represents a novel and promising approach to determine mineralisation, composition, homogeneity and volume of urinary calculi based on preoperative NCCT. CT-CM could provide valuable information to predict outcome of different stone treatment methods.

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Titel: CT-calculometry (CT-CM): advanced NCCT post-processing to investigate urinary calculi
verfasst von: Valentin Zumstein
Patrick Betschart
Lukas Hechelhammer
Hans-Peter Schmid
Dominik Abt
Magdalena Müller-Gerbl
Publikationsdatum: 25.09.2017
Verlag: Springer Berlin Heidelberg
Erschienen in: World Journal of Urology / Ausgabe 1/2018
Print ISSN: 0724-4983
Elektronische ISSN: 1433-8726
DOI: https://doi.org/10.1007/s00345-017-2092-7

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