Epic Radiant is the radiology module within Epic’s electronic health record (EHR) system. It functions as a radiology information system (RIS), giving schedulers, technologists, and radiologists the tools they need to manage imaging workflows from start to finish: scheduling exams, documenting procedures, communicating results, and tracking films. If your hospital or clinic runs Epic, Radiant is the piece that handles everything related to diagnostic imaging.
What Radiant Actually Does
At its core, Radiant manages the life cycle of a radiology order. A referring physician places an imaging order elsewhere in Epic, and Radiant picks it up from there. Schedulers use it to book the exam using rules-based scheduling, which automatically matches the order to the right equipment, room, and time slot based on criteria the department has configured. Technologists use it to document what happened during the scan. Radiologists use it to protocol studies, read images, and deliver reports back to the ordering provider.
The system also handles results communication and detailed statistical reporting, so department managers can track turnaround times, volumes, and other performance metrics. Optional tools extend its functionality into breast imaging (mammography tracking, recall management) and interventional radiology for procedure-specific documentation.
How It Connects to Imaging Equipment and PACS
Radiant doesn’t display the images themselves. That job belongs to a PACS (picture archiving and communication system), which stores and renders the actual scans. What Radiant does is integrate tightly with PACS and imaging equipment through a set of standardized connections.
On the PACS side, Epic offers APIs that support single sign-on, patient context synchronization, and study context synchronization. In practice, this means a radiologist can click on a study in Radiant and have the correct images open automatically in their PACS viewer without logging in again or searching for the patient. Real-time measurement exchange lets data flow between the two systems so findings captured in the PACS can appear in the Epic record.
On the equipment side, Radiant communicates with scanners and other modalities using DICOM, the universal standard for medical imaging. Several specific DICOM interfaces make this work:
- Modality Work List: Sends patient and exam details directly to the scanner, so technologists don’t have to re-type demographic information at the machine.
- Modality Performed Procedure Step: Lets the scanner notify Radiant when a procedure starts and when it’s complete, keeping the order status accurate in real time.
- Structured Reporting: Allows modalities to send specific measurements from the exam (like dose information or quantitative results) back into Epic in a structured format.
- Secondary Capture: Forwards key images flagged by the technologist into the patient’s Epic chart, so clinicians outside radiology can view them without opening the full PACS.
There’s also a web-based image access API that generates secure, contextual links to launch images in an enterprise viewer. This is what allows a primary care physician reviewing a patient’s chart to click a link and see the relevant scan directly.
How Radiant Fits Into the Broader Epic System
One of Radiant’s main selling points is that it isn’t a standalone system. It’s built into the same database as every other Epic module, which means radiology data lives alongside lab results, medications, surgical notes, and everything else in the patient’s record. When a provider orders an imaging study, that order flows seamlessly into Radiant. When the radiologist signs a report, it flows back to the ordering provider’s inbox and becomes part of the permanent chart.
This closed-loop design ensures that orders, alerts, and communications stay connected. A critical finding flagged by a radiologist triggers notifications within the same system the referring physician already works in. There’s no interface engine translating messages between separate vendors, which reduces the risk of results getting lost or delayed. The system also links with other Epic ancillary modules covering areas like cardiology and pathology, creating a single longitudinal record across specialties.
Who Uses It and Where
Radiant is used primarily at large hospitals and academic medical centers, though Epic has expanded into smaller health systems over the years. It earned a “Best in KLAS” designation for large hospital radiology systems, and Epic broadly dominates the EHR market at major U.S. health systems. If you’re joining a radiology department at a hospital that uses Epic, there’s a strong chance you’ll be working in Radiant daily.
Deploying Radiant is part of a larger Epic implementation, not a standalone project. A full Epic rollout at a health system typically takes many months of scoping, configuration, testing, and training before go-live. UC San Diego’s student health implementation, for example, took about 10 months from start to finish. Larger, more complex hospital deployments with multiple ancillary modules like Radiant often run considerably longer.
The Day-to-Day Experience
For schedulers, Radiant is where you book and manage imaging appointments. The rules engine handles much of the complexity: matching contrast requirements, equipment compatibility, and patient prep instructions to the right appointment type.
For technologists, it’s the system where you pull up your worklist each shift, confirm patient identity, document the procedure, flag key images, and mark exams as complete. Because Radiant communicates with the scanner through DICOM, much of the exam metadata populates automatically.
For radiologists, Radiant is the command center. You protocol incoming studies (assigning the right exam type and any contrast requirements), manage your reading worklist, and dictate reports. Most sites integrate speech recognition software so radiologists can dictate directly into the system. Once the report is signed, it’s immediately available to the entire care team through Epic’s shared record.
For referring physicians and other clinicians, the interaction with Radiant is mostly invisible. They see imaging results, reports, and key images within the same Epic chart they use for everything else. That seamless experience is, in many ways, the whole point of building radiology into a unified EHR rather than running it as a separate system.