C-Arm (Mobile Fluoroscopy)

C-shaped mobile fluoroscopic imaging system. X-ray tube on one end, image intensifier (legacy) or flat-panel detector (modern) on the other, joined by the rigid C structure that pivots around the patient. Used intra-operatively for real-time imaging in orthopedics, spine, pain management, vascular access, urology (ESWL, ureteral stenting), cardiac, intraoperative cholangiography, and general surgery.

Physics

Continuous-wave or pulsed X-ray fluoroscopy. Image intensifiers convert X-ray to visible light, then CCD or CMOS camera captures the optical signal. Modern flat-panel detectors convert X-ray directly to electrical signal, eliminating the II tube and removing the geometric distortion (pincushion) that legacy IIs exhibit at the periphery. Pulsed-fluoro modes drop dose substantially compared with continuous fluoro at equivalent visualization for slow-moving anatomy.

History

1950s — image intensifier invented.
1960s — mobile C-arm form factor emerges.
1999 — OEC 9800 ships — becomes the global workhorse and the de facto reference platform for two decades.
2010 — OEC 9900 Elite succeeds the 9800; flat-panel option arrives on the OEC line.
2010s — flat-panel detectors progressively replace image intensifiers on premium units; Siemens Cios Alpha and Philips Zenition establish flat-panel competition.
2020s — fully flat-panel mid-tier across the major OEMs; legacy 9800-class image-intensifier units remain dominant in the refurb market.

Key specs

II size (legacy) — 9" (orthopedic / pain default) or 12" (vascular / broader anatomy).
Flat-panel size (modern) — typically 21–31 cm across diagonal.
Arc depth — Standard or Super-C (deeper clearance for larger / complex-positioning patients).
Orbital control — manual, motor-driven (e.g., 9800 MD), or fully motorized on premium platforms.
Generator power — kW rating; kVp ceiling for penetration.
Software packages — General-Surgical (GSP), Endoscopy / Spine (ESP), Vascular, NeuroVascular, Cardiac. These shape image processing, default exposure, and review tools.

Systems

GE OEC 9800 family (legacy / refurb workhorse), OEC 9900 Elite (current GE flat-panel)
Ziehm Vision RFD family (premium flat-panel competitor)
Siemens Cios Alpha, Cios Fusion
Philips Veradius, Zenition
Philips BV Pulsera / BV Endura / BV Libra (legacy image-intensifier line)
Siemens Arcadis Avantic (predecessor-class)

Clinical applications

Diagnostic Cath — small / mobile cardiac fluoro adjuncts
Peripheral Angioplasty — selected mobile-supported cases
Stereotactic biopsy — adjacent fluoroscopy use
Spine / pain management — pedicle-screw verification, epidurals, facet blocks, medial branch, SI joint
Orthopedic fracture fixation, intraoperative cholangiography, ESWL, ureteral stenting

Service and refurb posture

Largest refurb market in imaging after ultrasound carts. OEC 9800-class units remain in active service worldwide; parts and aftermarket support are mature.
Mobile, battery-operated when needed, plugs in for sustained fluoro. Shared-generator architecture across variant configurations.
Tube life, II / detector condition, and software-package licensing are the price-determining variables on refurbs.
See GE OEC 9800 Field Guide for the canonical service playbook.

Regulatory

State fluoroscopy registration + operator licensing (per state).
RSO required at the institutional level.
Per-procedure dose monitoring under fluoroscopy-dose-tracking regulations adopted in many states.
Lead apron / thyroid shield / lead-glass standards for operating-team radiation safety.

Fluoroscopy Fixed-Table (sibling modality)
Digital Radiography
Intraoperative CT (adjacent intraoperative imaging)
GE OEC
Ziehm
GE OEC 9800 Field Guide
Surgeon — C-arm User
Biomed Engineer