Match the
treatment images.
A still from the simulator: today’s CBCT is offset from the planning CT in this axial view.
Plan CT · orangeToday CBCT · blue
Recorded simulator tourEducational demo · Not for clinical use · Media credits
Match the
Verify in
both views.
Compare the same images before and after guide placement. Red guides are offset; green guides align with the fiducials.
AP left · lateral right · before and after
Follow the
simulated delivery.
A recorded Beam On state, with monitor units and gantry angle shown. In the trainer, delivery requires manual Beam On.
Deploy the
imaging arms.
The kV imaging pair and MV detector are extended. Their positions are maintained in the next gantry view.
Rotate the gantry.
With both imaging systems extended, the gantry is rotated around isocentre. Its angle determines the beam direction.
Look inside the
treatment head.
The casing is hidden to expose representative accelerator and beam-shaping components. This is a teaching model, not manufacturer CAD.
Choose how you
want to practise.
Start with image registration, work through a complete simulated fraction, or explore the treatment room.
Image matching2D/2D, CBCT, and MR registration
Match AP and patient-left lateral images using 5DOF controls, or review CBCT and MR in three planes with up to 6DOF. Each case specifies the anatomy and training tolerance to use.
After a graded match, review the remaining error on each scored axis.
See a match-feedback example
The longitudinal correction is too small in this example; the other two axes are within the case limit.
| Axis | Residual | Feedback |
|---|---|---|
| Lateral | +0.10 cm | Within tolerance |
| Longitudinal | +0.40 cm | Under-corrected |
| Vertical | −0.10 cm | Within tolerance |
Full TreatmentFrom setup and verification to delivery
Connect image acquisition and registration with couch correction, machine preparation, verification, and simulated delivery. Positioning and Beam On remain explicit learner actions in the trainer.
Machine RoomGeometry, clearance, and internals
Explore 18 setups. Move the gantry, couch, kV arms, and MV imager around a representative training linac. Inspect clearance, 36 labelled internal components, the secondary jaws, and the 120-leaf MLC.
Independently authored geometry and educational proxies are identified in context.
Free public beta · Account required · No card · No patient uploads
Educational simulator only. Not a medical device or for clinical use. Setup errors, treatment scenarios, and displayed values are simulated. Optional support never changes trainer access.
No dose calculation or ARRT board preparation.
Current case library.
The library covers cranial, thoracic, abdominal, pelvic, and extremity anatomy across several matching methods.
Browse the case images and descriptions. Some previews omit head-derived imagery.
13 planar cases · 16 CBCT and MR cases · 8 public workflows
Source and derived content are identified in each case.
Research anatomy, synthetic targets, motion, setup errors, and plans are identified in context. Source-specific privacy evidence and gaps are recorded in the credits.
Open the data and image creditsBuilt from a learner’s need and shaped by clinical practice.
Created and maintained by Craig Utter, a practicing radiation therapist with a Bachelor of Science in Health Science.
About the projectBring the practice
into your classroom.
Assign practice modules, run a supervised Live Lab, and review private results. Students can also practise independently.
For instructors
Assign cases to your class and follow participation, progress, and help requests during Live Lab.
For students
Join your class with a code, complete assigned modules, and take part in instructor-led Live Lab sessions.
Actual classroom interfaces · fictional class and learner data
How grading and classroom visibility work
Registration attempts are server-graded; Full Treatment outcomes are labeled as simulator-reported. Results stay between the student and authorized class staff, remain private training records rather than competency credentials, and are not posted to a public leaderboard.
Live Lab does not expose student emails or patient images. Presence updates only after an explicit join and while the trainer tab is visible.
Open learning guides.
Review the concepts behind image matching before you practise, or return to a guide when you need a refresher.
Questions about access and use.
The trainer is educational software. It does not accept patient uploads and must not be used for clinical decisions.
Ask a question or suggest an improvementIs the trainer free?
Yes. The trainer is free during the public beta. A free account is required, and no card is needed.
Is it for clinical use?
No. This is an educational simulator, not a medical device, and it must not be used to plan, verify, or deliver clinical treatment. Setup errors, scenarios, and displayed values are simulated, and the trainer does not accept patient uploads.
Do I need an account?
Yes. A free account is required to open the trainer, access all public beta cases, and save your progress.
Who is it designed for?
It is designed for radiation therapy students, educators, training programs, and clinical staff. It can be used for IGRT registration practice and classroom demonstration without access to a treatment machine.
What types of matching can I practice?
You can practice 2D/2D registration and CBCT or MR three-plane matching, with 5DOF and 6DOF couch corrections. Cases include bony, soft-tissue, fiducial, and target-focused matching, plus connected Full Treatment workflows.
Open the RT Image Matching Trainer.
A free account is required. No card. No patient uploads.
Open the trainer