What teleradiology is
Teleradiology separates where a study is acquired from where it is read. The imaging happens at the clinic, on the clinic's own CT, MR, ultrasound or X-ray equipment, with the patient physically present. The interpretation happens elsewhere, by a radiologist who is not on site, working from images sent to them over a network rather than a film or a disc handed across a desk.
The practice grew out of overnight remote coverage: hospitals covering emergency reads by sending studies to radiologists in a different time zone, so a 2am scan still got read by someone awake and on shift. That after-hours use case is still common, but teleradiology is no longer just a night and weekend fallback. For a clinic without in-house radiology, sending studies out for reading can simply be the routine model rather than the exception.
How it works technically
Underneath the term, the mechanics are the same regardless of which reading service is involved:
- 1The study is acquired on the clinic's imaging equipment and lands in the clinic's DICOM archive, the same as it would if the clinic read everything in house.
- 2The study is transferred to the reading service: a portal upload, a direct DICOM connection or VPN link, or a cloud exchange the provider runs.
- 3The remote radiologist opens the study in their own viewer, on their own workstation, wherever that physically is.
- 4The radiologist dictates and signs a report.
- 5The report is sent back to the clinic, ideally attached to the original study rather than living only in a separate portal.
The step worth paying attention to is where the clinic's own PACS sits in that chain. The PACS is what acquires and archives the study before it ever leaves, and it is what the signed report should attach to when it comes back. Teleradiology is the middle of that chain, not a replacement for either end of it.
When clinics use reading services
- No in-house radiologist. Many imaging centers and clinics, especially smaller or newer ones, do not employ a radiologist directly. Every study they acquire needs to go somewhere to be read, and a reading service is that somewhere.
- Night and weekend coverage. The original use case is still real: studies acquired outside a clinic's own radiologist's hours go to a remote reader instead of waiting until morning.
- Subspecialty second reads. A study that needs a neuroradiologist or a musculoskeletal specialist may go to a reading service even at a clinic that has general radiology coverage in house, because the subspecialty read is not available locally.
- Volume overflow. When a clinic's own reading capacity is full, extra volume goes out to a reading service rather than backing up the worklist.
How to choose a teleradiology provider
The practical differences between reading services show up in a handful of places, and they are worth asking about directly rather than assuming:
- Turnaround time by study type. A routine outpatient study and an urgent one do not move at the same speed, and a provider's stated turnaround should be specific to the kind of study a clinic actually sends, not a single blended number.
- Subspecialty coverage. General radiology coverage does not guarantee coverage for the specific subspecialty reads a clinic needs, so it is worth checking against the actual modality and study mix, not just the provider's marketing list.
- US-licensed and boarded readers. Worth confirming directly, along with which state licenses the radiologists hold and whether that matches where the clinic operates.
- How studies get to them. A VPN or direct DICOM connection, a secure portal upload, or a cloud exchange the provider maintains. Each has different setup work on the clinic's side and different implications for who touches the study in transit.
- How the report comes back. Attached to the study inside the clinic's own system, or only viewable in a separate provider portal the clinic's staff has to log into and cross-reference by hand.
- Pricing per read. Per-study pricing scales differently than a flat rate does, and it is worth running the clinic's actual monthly study volume against the provider's rate before signing rather than after.
Where the clinic's PACS fits
Teleradiology changes who reads a study. It does not change whether a clinic needs its own archive. A clinic still acquires the study, still needs it available for the visit it was taken for, and still needs it available years later if the same patient comes back or another provider requests the prior exam. None of that goes away because the interpretation happened somewhere else.
The honest version of this is that a reading service and a clinic's archive are two different things, and it is worth keeping them that way. With a self-hosted PACS like MiniPACS, the study stays archived at the clinic, on the clinic's own server, so the reading service never becomes the clinic's only copy of its own imaging. Reports attach to the study in the archive rather than living only in a separate provider login; the exact handoff mechanics, how studies reach the readers and how signed reports come back, are worth confirming with the specific provider before signing. If the reading service ever changes, or the clinic adds a second one, the clinic's own imaging history does not move with that decision, because it was never stored there in the first place.
For how a PACS works day to day, see what is PACS. For the tradeoffs between running the archive on the clinic's own server versus a cloud PACS, see cloud vs onsite. For how to compare PACS vendors on pricing and contract terms, see comparing vendors. For pricing and how MiniPACS fits alongside a reading service, see the landing.
FAQ
What is teleradiology?
Teleradiology is the practice of acquiring a medical imaging study in one location and having it interpreted by a radiologist somewhere else, with the images and the report moving over a network instead of a courier. The study is taken at the clinic where the patient is, sent electronically to a remote reading service, and the radiologist reads it from their own workstation, wherever that is.
How do studies get to the remote radiologist?
The study is acquired on the clinic's imaging equipment as DICOM, the standard imaging format. From there it moves to the reading service one of a few ways: a secure portal upload, a direct DICOM connection or VPN link between the clinic's system and the provider, or a cloud exchange the provider maintains. Whichever path, the study needs to leave the clinic's archive and land in a form the remote radiologist's viewer can open before a report comes back.
Does a clinic using teleradiology still need a PACS?
Yes. Teleradiology replaces who reads the study, not where it lives. A clinic still needs somewhere the study is acquired, archived, and made available for the current visit and any future one, and somewhere the signed report attaches once it comes back. A reading service that also becomes the clinic's only copy of its own imaging history is a different, riskier arrangement than a reading service that reads studies the clinic keeps archiving itself.
What should a clinic ask a teleradiology provider?
Turnaround time by study type, since routine and urgent studies do not move at the same speed. Subspecialty coverage for the modalities the clinic actually sends, not just general radiology. Whether readers are US-licensed and board-certified. How studies physically get to them: portal upload, VPN, or direct DICOM, and what that setup takes on the clinic's end. How the signed report comes back: attached to the study in the clinic's own system, or only visible in a separate provider portal. And how pricing works, since per-read pricing behaves very differently at low and high volume than a flat monthly rate does.
Who owns the archive when using a reading service?
That depends entirely on the setup, and it is worth asking directly rather than assuming. If the clinic runs its own PACS and grants the reading service access to send studies out and receive reports back, the clinic's archive stays the clinic's, on its own server, under its own backups and audit log. If the reading service's own system becomes the only place studies live, the clinic no longer controls its own imaging history and depends on that vendor to keep it, export it, or hand it back.