GE HealthCare SIGNA PET/MR
GE HealthCare · Model SIGNA PET/MR
A comprehensive set of sequences designed to generate high-resolution images with T1, T2, T2 FLAIR, PD-weighted and MRA contrast with sound levels that are within 3dB of ambient conditions The system includes PET characterized RF coils that have been calibrated and attenuation corrected for during PET/MR whole body simultaneous scanning. The GEM Suite of flexible coils are designed for MR imaging of smaller structures and patient comfort Offers high channel count, analog to digital-optical signal conversion where it matters - inside the scan room to minimize noise and signal degradation, but away from the patient RF body coils are water and air-cooled for optimum duty-cycle performance, short repetition time (TR) and echo time (TE), producing sharp and clear images < 400ps timing resolution for fast TOF performance 25cm axial FOV for sensitivity and coverage 21cps/kBq for exceptional sensitivity
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.
Workstation RAID / GPU
Class Periodic replacementRel. cost $$$R&R Difficult
RF receive coil
Most-replaced patient-facing component.
Class Major service partRel. cost $$$$R&R Moderate
Cold head / compressor
Critical for magnet cooling.
Class Major service partRel. cost $$$$R&R Expert-level
Gradient coil cooling pump
Class Periodic replacementRel. cost $$$R&R Difficult
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Workstation RAID / GPU | Periodic replacement | $$$ | Difficult |
| RF receive coil Most-replaced patient-facing component. | Major service part | $$$$ | Moderate |
| Cold head / compressor Critical for magnet cooling. | Major service part | $$$$ | Expert-level |
| Gradient coil cooling pump | Periodic replacement | $$$ | Difficult |
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.
Technical Specs
- Clinical Use
- Whole Body
- Gantry (Max. Clearance)
- 60 cm
- Magnetic Field Strength
- 3 T
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.
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