AWS Details Hybrid Hub-and-Spoke Pattern for Cloud-Native Medical PACS Architecture

AWS Architecture published a comprehensive reference architecture outlining a hybrid hub-and-spoke pattern for modernizing hospital Picture Archiving and Communication Systems (PACS). As hospital networks expand, individual health systems generate millions of DICOM imaging studies annually—totaling between 50 and 200 terabytes of high-resolution data per year per system. The architecture establishes local edge nodes at individual hospital facilities connected via AWS Direct Connect or Site-to-Site VPN to a centralized AWS cloud archive governed by automated Amazon S3 lifecycle tiering. For enterprise cloud architects in healthcare and regulated sectors, this pattern addresses the critical operational friction between local diagnostic latency and centralized retention mandates. Radiologists demand sub-second image retrieval times that standard WAN links cannot reliably support during peak clinical hours, leading to localized storage sprawl. The hybrid blueprint treats local facility PACS instances as active working-set caches (the spokes) while federating the durable system of record in the cloud (the hub). This eliminates siloed departmental storage arrays while ensuring continuous on-site clinical workflows even during temporary wide-area network degradations. The architectural shift mirrors broader industry modernization patterns seen across distributed data platforms, where edge-to-core topology replaces lift-and-shift migrations. As healthcare organizations prepare their datasets for computer vision models, foundation model evaluations, and multimodal diagnostics, storing petabytes of DICOM blobs across fragmented SAN/NAS hardware blocks downstream integration. Centralizing image stores into cloud object tiers with standard metadata schemas creates an accessible data lake for automated analytics without compromising localized regulatory compliance or high-availability clinical requirements. Practitioners implementing this pattern must carefully model egress patterns and S3 lifecycle transitions to avoid unexpected retrieval costs. Fast-moving diagnostic sets should reside in short-term local caches, transitioning to S3 Standard and subsequently to S3 Glacier Flexible or Deep Archive as studies age past initial read windows. Network architects should ensure redundant multi-carrier interconnects are active before deprecating on-premises replication targets, and PACS administrators must validate vendor compatibility with asynchronous cloud ingestion APIs to prevent backpressure on acquisition modalities.