Automated volumetric assessment by noncontrast computed tomography in the surveillance of nephrolithiasis

Urology
Sutchin R PatelPerry J Pickhardt

Abstract

To evaluate the use of automated volumetric assessment for stone surveillance and compare the results with manual linear measurement. We retrospectively reviewed patients seen in our stone clinic who had undergone 2 noncontrast computed tomography (NCCT) scans without stone intervention during the interval between scans. Thirty patients met our inclusion criteria and underwent longitudinal assessment for urolithiasis via NCCT (mean interval 583.2 days, range 122-2030). Fifty-two discrete calculi were analyzed. Three board certified radiologists measured maximal linear stone size in the axial plane using electronic calipers on soft tissue (ST) and bone windows (BWs). Automated stone volume was also obtained by each reader using a dedicated prototype software tool for stone evaluation. Mean stone linear size and volume was 4.9 ± 2.8 mm (ST), 4.5 ± 2.6 mm (BW), and 116.2 ± 194.6 mm(3) (window independent), respectively. Mean interobserver variability for linear size measurement was 16.4 ± 10.5% (ST) and 20.3 ± 13.8% (BW). Interobserver variability for volumetric measurement was 0%. Of the 52 persistent stones, the mean percent change in linear stone size between CT studies was 39.3 ± 46.7% (ST) and 42.9 ± 53.1% (BW) growth, compar...Continue Reading

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Citations

Apr 13, 2017·AJR. American Journal of Roentgenology·Alice E HuangCynthia H McCollough
Oct 27, 2017·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Dmitry GilAlexey Vertegel
Nov 21, 2018·The British Journal of Radiology·Virginia B PlanzPerry J Pickhardt
Sep 28, 2017·World Journal of Urology·Valentin ZumsteinMagdalena Müller-Gerbl

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