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Clinical Reproducibility of the Stone Volume Measurement: A "Kidney Stone Calculator" Study
Arthur Peyrottes1,2, Marie Chicaud1,3,4,5, Cyril Fourniol2
1GRC n°20, Groupe de Recherche Clinique Sur La Lithiase Urinaire, Hôpital Tenon, Sorbonne Université, 75020 Paris, France.
Journal of Clinical Medicine
|October 14, 2023
Summary
The Kidney Stone Calculator (KSC) software reliably estimates kidney stone burden, showing high inter-observer and intra-observer agreement. This tool aids in surgical planning for retrograde intra-renal surgery.
Area of Science:
- Urology
- Medical Imaging
- Software Development
Background:
- Accurate kidney stone burden estimation is crucial for predicting surgical outcomes in retrograde intra-renal surgery.
- Volumetric measurements offer superior stone burden stratification compared to linear measurements.
- The Kidney Stone Calculator (KSC) software was developed for 3D stone volume assessment and lithotrity duration estimation.
Purpose of the Study:
- To validate the reproducibility of the Kidney Stone Calculator (KSC) in clinical settings.
- To evaluate the inter-observer and intra-observer correlations of the KSC software.
- To assess the reliability of KSC for kidney stone burden estimation.
Main Methods:
- Fifty patients with renal stones were retrospectively analyzed.
- Three urologists with varying experience levels performed five KSC measurements per patient.
- Measurements were conducted on non-contrast-enhanced computed tomography (NCCT) images.
Main Results:
- High overall inter-observer correlation (Kendall's coefficient = 0.99, p < 0.0001).
- Inter-observer reproducibility exceeded 0.8 for all paired analyses.
- Intra-observer variation coefficients ranged from 4% to 6%, with Kendall's coefficient > 0.98 (p < 0.0001).
- Segmentation of complex stones showed lower reproducibility.
Conclusions:
- The Kidney Stone Calculator is a dependable tool for estimating kidney stone burden.
- The KSC's ability to estimate lithotrity duration is valuable for surgical planning.
- The software demonstrates high reliability for clinical use in urology.
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