Modern PACS can be deployed on‑premises, in the cloud, or in hybrid configurations. Each model offers different trade‑offs in scalability, security, latency, and cost.
On‑Premises PACS
A traditional model where all servers, storage, and networking reside within the facility.
- Scalability: Limited by physical hardware; expansion requires capital investment.
- Security: Full control over data governance, but also full responsibility for patching and hardening.
- Latency: Lowest latency for local modalities and workstations.
- Cost: High upfront cost; predictable ongoing maintenance.
- Best for: Large hospitals with strong IT teams and strict data‑sovereignty requirements.
Hybrid PACS
Combines local infrastructure with cloud storage or compute.
- Scalability: Cloud tiers allow elastic growth for long‑term archive or overflow.
- Security: Shared responsibility; requires careful identity and access management.
- Latency: Local performance for active studies; cloud latency for deep archive retrieval.
- Cost: Balanced CAPEX/OPEX; cost optimization depends on tiering policies.
- Best for: Multi‑site systems, growing organizations, or facilities transitioning to cloud.
Cloud PACS
All major components—archive, database, routing, and viewing—run in cloud environments.
- Scalability: Near‑infinite storage and compute elasticity.
- Security: Strong cloud-native controls but requires rigorous configuration.
- Latency: Dependent on network quality; mitigated by edge caching.
- Cost: OPEX‑based; costs scale with usage.
- Best for: Small facilities, teleradiology groups, or organizations prioritizing agility and reduced infrastructure overhead.