ViewRay MRI-Guided Radiation Therapy System
ViewRay · Model MRI-Guided Radiation Therapy System
A rotating gantry assembly with three Cobalt-60 teletherapy heads and three multileaf collimators. A split-magnet MRI system for volumetric and multiplanar soft-tissue imaging. A patient couch, two in-room couch control panels, and a laser positioning system to facilitate initial patient setup. A control console, located just outside the treatment room, to start and stop treatment and monitor status. An operator console for MRI acquisition, patient positioning, dose prediction and reoptimization, and real-time tumor tracking. Integrated treatment planning and delivery software for creating treatment plans and managing the treatment delivery process. A planning station for defining structures and constraints and planning and optimizing treatments. Plan reviews may be conducted remotely. A database server containing patient and machine data used by the system.
Key tips
- ·Never bypass a radiation interlock to "just get the image" - this is one of the few true zero-tolerance rules in BMET work.
- ·Trend image-quality phantom results over time - drift shows up before an outright failure does.
- ·Portable/mobile units take real physical abuse from transport - check wheel locks and cable strain reliefs more often than fixed units.
Typical Failure Modes
Failure patterns typical of this equipment class - general BMET reference, not verified against this exact unit's own service history unless flagged. Severity is a category-level estimate.
Helium / cryogen pressure fault
HighSymptoms: Cold-head fault, quench alarm.
Root cause: Cold-head compressor wear or helium loss.
Gradient coil overheating
HighSymptoms: Sequence abort, thermal alarm.
Root cause: Cooling loop restriction or coil wear.
RF coil element failure
MediumSymptoms: Signal dropout, noise-band image artifact.
Root cause: Coil element or cable damage.
Recon / system software hang
LowSymptoms: Frozen console, acquisition timeout.
Root cause: Workstation or RAID degradation.
Serviceable Parts & Consumables
The parts a BMET typically services on this class of equipment. Service class and relative cost are general engineering estimates for the category, not figures from this unit's documentation. Part numbers appear only when pulled from this unit's own service manual. Always confirm intervals and pricing against the manufacturer.
RF receive coil
Most-replaced patient-facing component.
Class Major service partRel. cost $$$$R&R Moderate
Cold head / compressor
Critical for magnet cooling.
Class Major service partRel. cost $$$$R&R Expert-level
Gradient coil cooling pump
Class Periodic replacementRel. cost $$$R&R Difficult
Workstation RAID / GPU
Class Periodic replacementRel. cost $$$R&R Difficult
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| RF receive coil Most-replaced patient-facing component. | Major service part | $$$$ | Moderate |
| Cold head / compressor Critical for magnet cooling. | Major service part | $$$$ | Expert-level |
| Gradient coil cooling pump | Periodic replacement | $$$ | Difficult |
| Workstation RAID / GPU | Periodic replacement | $$$ | Difficult |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
PM Checklist
Preventive-maintenance tasks typical of this equipment class. Perform to the manufacturer's procedure and your facility's policy - this is general reference, not a schedule for this specific unit.
- ·Daily QC per modality: image-quality phantom test
- ·Tube and detector inspection
- ·Annual state-required radiation safety survey
- ·Vendor-scheduled preventive maintenance
Troubleshooting Approach
A structured starting point derived from the failure modes above. Follow the manufacturer's service documentation for the actual procedure.
Symptom: Helium / cryogen pressure fault
- Confirm the presentation - typically cold-head fault, quench alarm - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: cold-head compressor wear or helium loss.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the rF receive coil per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Symptom: Gradient coil overheating
- Confirm the presentation - typically sequence abort, thermal alarm - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: cooling loop restriction or coil wear.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the cold head / compressor per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Radiology / Imaging department
- Emergency Department (portable units)
- Operating Room (C-arms)
- Cath lab
- Bedside ICU (portable X-ray)
Documents & Manuals
No documents available for this device yet.
Safety & Recalls
Synced live from the FDA openFDA API.
- RECALL
Software anomalies affecting the French, German and Italian versions of treatment delivery system (TDS) software.
- RECALL
There is a potential that components of the receive coil can reach elevated temperatures which has the potential to cause a burn injury to the patient or user.
- RECALL
Registering dose and structures in the treatment delivery workflow could result in an alignment discrepancy between the imported previously delivered dose and the displayed patient anatomy and structures. The MRIdian TPDS software shows this misalignment to the user in the predicted dose-volume histogram (DVH). The misalignment impact may not be obvious to the user. During plan re-optimization the previously delivered dose would be incorrectly accounted for by the software. This may result in unexpectedly higher or lower dose than the intended dose calculated for the subsequent treatment plan. When this occurs in the treatment planning workflow, the registration fails to align the dose with the image and the user is unable to proceed.
- RECALL
A discrepancy between optimization and planning forward dose calculation between adaptive optimizations and AQA dose calculations can occur.
- RECALL
Issue with transferring treatment regiment from one system to another. Adequate instructions for transferring treatment plan(s) are not provided within the operator's manual or within the software operating system.
- RECALL
When editing the isocenter or the couch position of the plan while in the treatment workflow (in the Points screen) and re-optimizing, the software will not prompt the user to shift the couch to the new isocenter. As a result there is the potential to deliver dose to the initial isocenter rather than the new location.
- RECALL
The system loaded a completion fraction in the incorrect order after a treatment interruption.
- RECALL
ViewRay discovered that in the event that an encoder breaks or fails on the Patient Handling System (PHS, or couch), when attempting to restart the system, the couch could move unexpectedly.
- RECALL
The software was failing to determine new patient locations if imaging is not enabled during treatment.
- RECALL
ViewRay received a report that the couch moved unexpectedly into the bore after performing a RTCS reboot.
- RECALL
The software was not correctly using the RT (Radiation Therapy) to MR (Magnetic Resonance image) coordinate correction for non HFS (Head First Supine) patient orientations, resulting in slice mismatch error.
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