Journal
CLINICAL JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY
Volume 8, Issue 7, Pages 1089-1097Publisher
AMER SOC NEPHROLOGY
DOI: 10.2215/CJN.10561012
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Funding
- National Institute of Diabetes and Digestive and Kidney Diseases of the National Institutes of Health [DK056943, DK056956, DK056957, DK056961]
- National Center for Research Resources General Clinical Research Centers [RR000039, RR00585, RR23940, RR000032]
- National Center for Research Resources Clinical and Translational Science Awards [RR025008, RR024150, RR033179, RR025777, UL1TR000165, RR024153, UL1TR000005]
- Otsuka Corp.
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Objective To evaluate the performance of a semi-automated method for the segmentation of individual renal cysts from magnetic resonance (MR) images in patients with autosomal dominant polycystic kidney disease (ADPKD). Design, setting, participants, & measurements This semi-automated method was based on a morphologic watershed technique with shape-detection level set for segmentation of renal cysts from MR images. T2-weighted MR image sets of 40 kidneys were selected from 20 patients with mild to moderate renal cyst burden (kidney volume < 1500 ml) in the Consortium for Radiologic Imaging Studies of Polycystic Kidney Disease (CRISP). The performance of the semi-automated method was assessed in terms of two reference metrics in each kidney: the total number of cysts measured by manual counting and the total volume of cysts measured with a region-based thresholding method. The proposed and reference measurements were compared using intraclass correlation coefficient (ICC) and Bland-Altman analysis. Results Individual renal cysts were successfully segmented with the semi-automated method in all 20 cases. The total number of cysts in each kidney measured with the two methods correlated well (ICC, 0.99), with a very small relative bias (0.3% increase with the semi-automated method; limits of agreement, 15.2% reduction to 17.2% increase). The total volume of cysts measured using both methods also correlated well (ICC, 1.00), with a small relative bias of <10%(9.0% decrease in the semi-automated method; limits of agreement, 17.1% increase to 43.3% decrease). Conclusion This semi-automated method to segment individual renal cysts in ADPKD kidneys provides a quantitative indicator of severity in early and moderate stages of the disease.
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