A 46-year-old with leg weakness is scheduled for fluoroscopy-guided lumbar myelography with iodinated contrast, needing consent, time-out and sterile needle placement in the subarachnoid space. Which technologist assistance best supports safe myelography and lumbar puncture performance?

Fluoroscopy-guided lumbar myelography with iodinated contrast is an invasive intrathecal procedure requiring infection control, imaging access, and patient safeguards, so maintaining a strict sterile field, assisting with prone fluoroscopic positioning, and monitoring vitals with consent verification directly supports safe subarachnoid placement, real-time guidance, and required consent and time-out compliance for leg weakness evaluation. The supine fluoroscopic approach fails on positioning because supine is standard for many barium and general studies but denies posterior midline access needed for lumbar puncture and prevents prone-oblique trajectory and contrast filling. The approach centered on contrast reaction management fails on verification because allergy monitoring is routine in contrast imaging yet it cannot replace documented consent and time-out required before intrathecal puncture. The clean aseptic preparation approach fails on sterility because limited clean technique suits peripheral tasks but subarachnoid entry demands full sterile field with drape, gloves, and tray discipline to prevent meningitis. An exam caveat is to avoid confusing intrathecal myelography with epidural injection or bedside non-fluoroscopic tap, which share trays but differ in space, guidance, contrast, and positioning. A practical check is to verify signed consent, allergy and anticoagulant history, complete time-out, confirm sterile setup and prone vitals baseline, then document contrast type, dose, and tolerance.