8 June 2023 Automatic measurement of kidney dimensions in two-dimensional ultrasonography is comparable to expert sonographers
Author Affiliations +
Abstract

Purpose

Length and width measurements of the kidneys aid in the detection and monitoring of structural abnormalities and organ disease. Manual measurement results in intra- and inter-rater variability, is complex and time-consuming, and is fraught with error. We propose an automated approach based on machine learning for quantifying kidney dimensions from two-dimensional (2D) ultrasound images in both native and transplanted kidneys.

Approach

An nnU-net machine learning model was trained on 514 images to segment the kidney capsule in standard longitudinal and transverse views. Two expert sonographers and three medical students manually measured the maximal kidney length and width in 132 ultrasound cines. The segmentation algorithm was then applied to the same cines, region fitting was performed, and the maximum kidney length and width were measured. Additionally, single kidney volume for 16 patients was estimated using either manual or automatic measurements.

Results

The experts resulted in length of 84.8 ± 26.4 mm [95% CI: 80.0, 89.6] and a width of 51.8 ± 10.5 mm [49.9, 53.7]. The algorithm resulted a length of 86.3 ± 24.4 [81.5, 91.1] and a width of 47.1 ± 12.8 [43.6, 50.6]. Experts, novices, and the algorithm did not statistically significant differ from one another (p > 0.05). Bland–Altman analysis showed the algorithm produced a mean difference of 2.6 mm (SD = 1.2) from experts, compared to novices who had a mean difference of 3.7 mm (SD = 2.9 mm). For volumes, mean absolute difference was 47 mL (31%) consistent with ∼1 mm error in all three dimensions.

Conclusions

This pilot study demonstrates the feasibility of an automatic tool to measure in vivo kidney biometrics of length, width, and volume from standard 2D ultrasound views with comparable accuracy and reproducibility to expert sonographers. Such a tool may enhance workplace efficiency, assist novices, and aid in tracking disease progression.

© 2023 Society of Photo-Optical Instrumentation Engineers (SPIE)
Rohit Singla, Cailin E. Ringstrom, Ricky Hu, Zoe Hu, Victoria A. Lessoway, Janice Reid, Christopher Nguan, and Robert N. Rohling "Automatic measurement of kidney dimensions in two-dimensional ultrasonography is comparable to expert sonographers," Journal of Medical Imaging 10(3), 034003 (8 June 2023). https://doi.org/10.1117/1.JMI.10.3.034003
Received: 21 December 2022; Accepted: 19 May 2023; Published: 8 June 2023
Lens.org Logo
CITATIONS
Cited by 1 scholarly publication.
Advertisement
Advertisement
RIGHTS & PERMISSIONS
Get copyright permission  Get copyright permission on Copyright Marketplace
KEYWORDS
Kidney

Ultrasonography

Image segmentation

Diseases and disorders

Biometrics

Education and training

Statistical analysis

Back to Top