Fluoroscopy (Fixed-Table)
Room-based fluoroscopy systems used for GI studies (barium swallow, small bowel follow-through, barium enema), urology (voiding cystourethrogram, retrograde), and general fluoroscopic procedures. Distinct from cath-lab interventional X-ray — different dose rates, different clinical workflows, different team compositions.
Two architectural variants:
- Under-table tube — patient lies on a table with the X-ray tube underneath and the detector (image intensifier or flat panel) above. Traditional R/F room. Radiologist + technologist at the table.
- Over-table tube (remote fluoroscopy) — tube above, detector under the table. Room controlled from an adjacent shielded console. Less operator radiation exposure.
Clinical applications
- GI studies — upper GI series (barium swallow), small bowel follow-through, barium enema, esophagram
- Urology — voiding cystourethrogram (VCUG), retrograde urethrogram, cystogram
- Hysterosalpingogram — fertility workup, tubal patency
- T-tube cholangiogram — biliary
- Arthrography — joint studies (less common now, MRI preferred)
- Barium swallow — modified barium swallow for dysphagia evaluation
Key specs
- Tube position — under-table (classic) vs over-table (remote)
- Detector — flat panel (modern) vs image intensifier (legacy)
- Table — tilting (critical for contrast flow), can-step patient (barium swallow positioning)
- Fluoro pulse modes — 7.5 / 15 / 30 fps typical
- Spot film capability — digital acquisition during fluoro for specific images
- Dose-management features — last-image-hold, dose tracking
Systems
- Siemens Luminos dRF
- Philips EasyDiagnost Eleva
- Canon Medical Ultimax-i (fluoro + DR hybrid)
- Shimadzu Sonialvision
Clinical workflow differences vs cath lab
- Contrast — water-soluble GI contrast or barium (low ionic vs cath lab's iodinated IV contrast)
- Team — radiologist + tech; no interventional cardiologist, no hemodynamics, no sterile cath-style draping
- Dose rate — lower than interventional cath (fluoroscopy for positioning and swallowing observation, not continuous therapeutic imaging)
- Procedure length — 10–45 min typical (vs multi-hour cath lab cases)
Service reality
- Tube life — longer than cath lab (lower duty cycle) but shorter than fixed DR (continuous fluoro use)
- Table mechanics — tilting + height adjustment wears over time
- Flat panel aging (newer systems) or image-intensifier end-of-life (legacy)
Regulatory
State fluoroscopy license. Physician fluoro operator credentialing (varies by state). Radiation dose tracking. Annual physicist survey.