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Varex PaxScan Flat-Panel Detector Family

The broadest-deployment flat-panel X-ray detector family in the imaging industry — PaxScan panels appear under multiple OEM brand names across digital radiography, mobile DR, cath labs, fluoroscopy, dental, and radiation-therapy portal imaging. Varex Imaging sells PaxScan as a component to OEMs rather than direct to clinical sites; the same physical panel SKU may ship as a "Brand X DR detector" and a "Brand Y fluoroscopy detector" with no end-user-visible indication of common origin.

PaxScan covers a wide size and pixel-pitch range:

  • 2520-class (~25 × 20 cm) — small-format panels for cath / fluoro and specialty applications.
  • 3030 / 3025 / 3024-class (~30 × 30 cm) — fluoroscopy and small DR.
  • 4030-class (~40 × 30 cm) — DR retrofit, mammography-adjacent.
  • 4343-class (~43 × 43 cm) — large-format DR, cath, portal imaging.

Pixel pitch varies from ~96 µm (high-resolution / cath) to ~194 µm (high-frame-rate / fluoroscopy), with CsI or gadolinium-oxysulfide scintillator options.

Fits (representative — not exhaustive)

PaxScan-class panels appear in:

  • Multiple fixed-room DR retrofit packages (post-CR-conversion deployments).
  • Mobile DR systems from second-tier OEMs.
  • Linac portal imaging (radiotherapy treatment-verification imaging on Varian / Elekta platforms).
  • Industrial / NDT / security X-ray systems (out of scope for the medical vault but reflects component-supply scale).

End users typically encounter PaxScan as the underlying part behind an OEM-branded "DR detector" or "fluoro detector" — the OEM badging is the visible interface, the Varex SKU is the underlying part.

Failure modes

  • Dead-pixel growth — cumulative single-pixel failure over panel lifetime; correctable up to a threshold via the calibration map.
  • Scintillator degradation — CsI moisture ingress / yellowing over very long lifetime; manifests as quantum-efficiency drop and higher noise.
  • Readout-ASIC failure — line / column artifacts; panel-replacement-only.
  • Mechanical impact — drops on portable units; cracked-glass panels are unrepairable.
  • Cable / connector wear — flexible-cable interfaces on portable units suffer flex-cycle fatigue.

Diagnosis

  • Bad-pixel-map trending — service-log review.
  • Flat-field uniformity acquisition on QC.
  • Dose-to-detector / quantum-noise trending.
  • Visible-artifact pattern recognition in clinical images.

Replacement

  • Component-level swap is straightforward where Varex-direct or aftermarket supply is available.
  • OEM-routed replacement through the parent OEM's service organization is the standard path for clinical sites under contract.
  • Gain / offset / bad-pixel-map regeneration post-swap, plus image-quality acceptance.

Field notes

  • Aftermarket supply is meaningfully better than vertically-integrated detector platforms (Trixell Pixium, in-house Canon / Hologic panels) — multi-customer component sales drive secondary-market liquidity.
  • Cross-OEM compatibility at the panel level is a refurb-economics feature even when OEM service organizations don't formally support cross-platform substitution.
  • Portable / mobile DR detectors age fastest in the fleet — drop incidence is the dominant operating cost.

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