Hologic Discovery / QDR-class DXA
Modality: Bone Densitometry (DXA)
Hologic's predecessor-generation fan-beam DXA platform — the legacy line that preceded the current Horizon family. QDR-class systems (Discovery A / W / Wi / C / Ci) covered the U.S. installed base through the 2000s and early 2010s. Still in widespread clinical service in community ophthalmology / endocrinology / rheumatology practices.
Variants in family
- Discovery A — top-tier; VFA + body composition + premium analytics.
- Discovery W / Wi — mid-tier.
- Discovery C / Ci — entry-tier value configuration.
- QDR-4500 — earlier-generation predecessor.
Distinctive technology
- Fan-beam acquisition — replaced earlier pencil-beam architecture; faster scan times.
- Hologic normative database — long-running clinical reference for U.S. screening continuity.
- Apex software ecosystem — Hologic's DXA acquisition / analysis software.
- VFA + body composition + atypical-femur modules on configured units (Discovery A).
Refurb posture
- Active refurb supply — Discovery A / W / Ci turnover as practices upgrade to Horizon.
- Software / Apex version drives analytics-package availability; outdated software constrains clinical use.
- Calibration / phantom-QC discipline is the operating-cost dominant variable.
- Vendor lock-in on serial patient comparison applies — Hologic-to-Hologic preferred for continuity.