Where your PACS runs decides what happens when the internet drops, where your patients' images live and what you pay in year five. This comparison covers cloud, on-premise and hybrid deployment without assuming one size fits every centre.
Cloud PACS is for a centre with a reliable uplink that values remote reading and zero servers on site, and accepts that every scan depends on the internet. On-premise PACS is for a centre that wants images on its own network, working without internet, and is prepared to own backup and hardware.
Hybrid is for the centre that wants both: a node at the centre that receives and serves studies locally, plus a thin cloud layer for remote viewing and an encrypted offsite copy. It is the model most small centres in India end up choosing once they have lost a day to a broken connection.
The machine sends each study over the internet to the vendor's servers. Viewing, reporting and sharing happen in the browser against those servers. Nothing runs at the centre except the modality and a router. If the uplink slows, sends queue; if it fails, the study cannot be read until it is back. Pricing is typically a subscription or a per-study charge.
A server at the centre runs the DICOM receiver, archive and viewer. Studies never leave the building unless you send them. Reading is fast on the local network and unaffected by the internet. The centre owns the hardware, the backup discipline and the replacement cycle. Remote reading needs a VPN or a separately exposed viewer, which is where many on-premise setups become either insecure or unused.
A node at the centre does everything on-premise does, and a cloud layer adds two things: remote viewing for a radiologist at home or a second site, and an encrypted offsite copy of every study. When the internet is down the centre keeps scanning and reading; when it is back the cloud catches up. This is how AuraPACS is built.
If your centre has had an internet outage in the last month that lasted more than an hour, cloud-only is a risk you are taking on every scan. If your radiologist ever reads from home, pure on-premise will either be extended with a remote path or quietly bypassed with CDs and WhatsApp screenshots.
Whatever you choose, ask two questions every vendor should answer in writing: who owns the data, and how do you export all of it in DICOM if you leave. See how to choose a PACS for the rest of the checklist.
Neither is better in the abstract. Cloud wins on remote access and zero hardware; on-premise wins on independence from the internet and data locality. Hybrid combines the two and is usually the better fit for centres with unreliable connectivity that still want remote reading.
Not for new studies or reading. Some setups cache sends and forward them later, but the radiologist cannot open studies stored in the cloud until the connection returns. A hybrid node avoids this by keeping the archive local.
Images stay on your network, which many centres prefer. Security then depends on your own practices: access control, patching, and an offsite backup. A hybrid system keeps the local control and adds the encrypted offsite copy.
One node on the centre's network. With AuraPACS the demo runs from a small Windows installer against the demo server; after payment the full system is activated by Site ID and runs on the customer's own network.
Yes, if the cloud vendor lets you export every study in DICOM. Ask for the export terms before you sign the first contract, because that answer decides how easy the move will be.
Cloud: built in. On-premise: a VPN or a separately secured viewer. Hybrid: the cloud layer serves the study to a browser at home or a second site, with role-based access and an audit trail.
Describe your setup in a message. We will say which option fits, even when that option is not ours.
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