Innovations in imaging hardware have led to a revolution in our ability to visualise vascular networks in 3D at high resolution. The segmentation of microvascular networks from these 3D image volumes and interpretation of their meaning in the context of physiological and pathological processes unfortunately remains a time consuming and error-prone task. Deep learning has the potential to solve this problem, but current supervised analysis frameworks require human-annotated ground truth labels. To overcome these limitations, we present an unsupervised image-to-image translation deep learning model called the vessel segmentation generative adversarial network (VAN-GAN). VAN-GAN integrates synthetic blood vessel networks that closely resemble real-life anatomy into its training process and learns to replicate the underlying physics of an imaging system in order to learn how to segment vasculature from 3D biomedical images. To demonstrate the potential of VAN-GAN, the framework was applied to the challenge of segmenting vascular networks from images acquired using mesoscopic photoacoustic imaging (PAI). With a variety of in silico, in vitro and in vivo pathophysiological data, including patient-derived breast cancer xenograft models, we show that VAN-GAN facilitates accurate and unbiased segmentation of 3D vascular networks from PAI volumes. By leveraging synthetic data to reduce the reliance on manual labelling, VAN-GAN lower the barriers to entry for high-quality blood vessel segmentation to benefit imaging studies of vascular structure and function.

/pdf/segmentation-of-3d-blood-vessel-networks-using-unsupervised-13mnvosk.pdf

Segmentation of 3D blood vessel networks using unsupervised deep learning

With the FDA approval of Artificial Intelligence (AI) for point-of-care clinical diagnoses, model generalizability is of the utmost importance as clinical decision-making must be domain-agnostic. A method of tackling the problem is to increase the dataset to include images from a multitude of domains; while this technique is ideal, the security requirements of medical data is a major limitation. Additionally, researchers with developed tools benefit from the addition of open-sourced data, but are limited by the difference in domains. Herewith, we investigated the implementation of a Cycle-Consistent Generative Adversarial Networks (CycleGAN) for the domain adaptation of Optical Coherence Tomography (OCT) volumes. This study was done in collaboration with the Biomedical Optics Research Group and Functional & Anatomical Imaging & Shape Analysis Lab at Simon Fraser University. In this study, we investigated a learning-based approach of adapting the domain of a publicly available dataset, UK Biobank dataset (UKB). To evaluate the performance of domain adaptation, we utilized pre-existing retinal layer segmentation tools developed on a different set of RETOUCH OCT data. This study provides insight on state-of-the-art tools for domain adaptation compared to traditional processing techniques as well as a pipeline for adapting publicly available retinal data to the domains previously used by our collaborators.

Domain Adaptation via CycleGAN for Retina Segmentation in Optical Coherence Tomography.

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Domain Adaptation via CycleGAN for Retina Segmentation in Optical Coherence Tomography.