C-arm troubleshooting guide: symptoms, causes and first-line checks

First principles before you troubleshoot

Stop using the unit if there is any smell of burning, visible damage, exposed wiring or uncontrolled movement. Never open covers or high-voltage compartments unless you are authorised and trained; the generator and tube contain hazardous voltages. Record the exact symptom, the mode in use, the time and any error message before touching anything, as this speeds up the repair.

Always consult the manufacturer's service manual for model-specific procedures. The suggestions below are general and do not replace it.

C-arm image quality problems and artefacts

Dark, bright or noisy images often come from the exposure settings, a wrong mode or patient thickness, so first confirm the mode, kV, mA and any automatic brightness behaviour. If the image is consistently noisy at normal settings, suspect detector calibration, a failing tube or generator drift, which need an engineer and a quality control test. See our maintenance and QC guide.

C-arm image artefacts have recognisable causes: lines or dead pixels point to the flat panel or its calibration; geometric distortion and brightness fall-off at the edges are typical of an ageing image intensifier; bright spots or ghosting may come from detector lag or a missing offset or gain calibration; and streaks near metal are often caused by metallic implants. Some models, such as the PLX C22, include metal artefact suppression software.

C-arm overheating and cooling faults

Overheating is usually flagged by a thermal warning, a forced pause or reduced output during long fluoroscopy. Check that the cooling intakes and fans are not blocked, that the filter is clean and that the room is not too warm. Allow the unit to cool as the manual requires and review how much continuous fluoroscopy is being used.

Units with active cooling, such as the Villa Arcovis DRF-C, depend on working fans and clean air paths. If the warning returns after normal cooling, the cooling system or a temperature sensor may be faulty and needs service. Frequent overheating can shorten tube life.

• Check intake and exhaust clearance
• Clean or replace filters per the manual
• Reduce continuous fluoroscopy; use pulsed mode
• Record how long the unit ran before the warning

C-arm error codes, collisions and movement faults

Write down the C-arm error codes exactly as shown, together with the sequence of actions that preceded them, and look them up in the manual. Many codes clear after a controlled restart, but a code that returns needs service. Do not repeatedly restart a unit with a high-voltage or tube error.

Brakes that do not hold, sluggish movement or noise from the vertical lift or arc point to mechanical wear, cable strain or low battery on assisted units. After any collision, stop and inspect the detector, cables and arc for damage before using the unit. Image-intensifier models such as the PLX C1112 have five mechanical movements that should be checked in turn.

Transfer failures and when to call service

If images do not reach PACS, check the network cable and link, the DICOM destination settings, the date and time, the storage capacity and any firewall changes before suspecting the unit. Keep a log of failures with times to help the IT team.

Call service for repeated error codes, persistent artefacts, overheating, mechanical faults or any safety concern. Beckfinity provides maintenance support and can advise on spares and repair for the C-arms we supply; contact us. For purchased second-hand units see our article on refurbished C-arms.