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Deep-learning segmentation of ultrasound images for automated calculation of the hydronephrosis area to renal parenchyma ratioopen access

Authors
Song, Sang HoonHan, Jae HyeonKim, Kun SukCho, Young AhYoun, Hye JungKim, Young InKweon, Jihoon
Issue Date
Jul-2022
Publisher
대한비뇨기과학회
Keywords
Congenital anomalies of kidney and urinary tract; Deep learning; Hydronephrosis; Ultrasonography
Citation
Investigative and Clinical Urology, v.63, no.4, pp.455 - 463
Indexed
SCIE
SCOPUS
KCI
Journal Title
Investigative and Clinical Urology
Volume
63
Number
4
Start Page
455
End Page
463
URI
https://scholarworks.korea.ac.kr/kumedicine/handle/2021.sw.kumedicine/61255
DOI
10.4111/icu.20220085
ISSN
2466-0493
Abstract
Purpose We investigated the feasibility of measuring the hydronephrosis area to renal parenchyma (HARP) ratio from ultrasound images using a deep-learning network. Materials and Methods The coronal renal ultrasound images of 195 pediatric and adolescent patients who underwent pyeloplasty to repair ureteropelvic junction obstruction were retrospectively reviewed. After excluding cases without a representative longitudinal renal image, we used a dataset of 168 images for deep-learning segmentation. Ten novel networks, such as combinations of DeepLabV3+ and UNet++, were assessed for their ability to calculate hydronephrosis and kidney areas, and the ensemble method was applied for further improvement. By dividing the image set into four, cross-validation was conducted, and the segmentation performance of the deep-learning network was evaluated using sensitivity, specificity, and dice similarity coefficients by comparison with the manually traced area. Results All 10 networks and ensemble methods showed good visual correlation with the manually traced kidney and hydronephrosis areas. The dice similarity coefficient of the 10-model ensemble was 0.9108 on average, and the best 5-model ensemble had a dice similarity coefficient of 0.9113 on average. We included patients with severe hydronephrosis who underwent renal ultrasonography at a single institution; thus, external validation of our algorithm in a heterogeneous ultrasonography examination setup with a diverse set of instruments is recommended. Conclusions Deep-learning-based calculation of the HARP ratio is feasible and showed high accuracy for imaging of the severity of hydronephrosis using ultrasonography. This algorithm can help physicians make more accurate and reproducible diagnoses of hydronephrosis using ultrasonography.
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