Hologic Horizon — Engineer Field Guide

Top failure modes

1. Detector drift — daily calibration phantom catches it. Skipping daily QC is the #1 mistake.
2. Motor belt wear on C-arm — scan line tracking errors.
3. Patient table cable flex — intermittent communication.
4. Software licensing — body composition and atypical femur are separate licenses that can lapse.

Accepting a refurbished Horizon

• Daily / weekly / monthly QC logs for last 12 months
• Phantom precision data
• License set documented
• ACR DXA accreditation status + transferability