TG-142 – Check Phantom

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The TG-142 Check Phantom is designed with efficiency in mind while implementing a fully-comprehensive range of TG-142 QA test protocols.


Key Features:

  • < 90 Minutes Start to Finish (Monthly)
  • Simple, Step-By-Step Protocols
  • iQA Auto Analysis Software
The TG-142 Check Phantom + iQA checks these items for AAPM TG-142 Monthly:



  • Jaw Position & Light Field Coincidence
  • Light Field vs Radiation Field Coincidence
  • ODI Verification
  • Table / Couch Angles
  • MLC Leaf Position Accuracy
  • Picket Fence


  • Photons & Electrons
  • Typical Dose Rate Output Constancy
  • Dynamic Wedge Constancy
  • Energy Constancy
  • Flatness & Symmetry (Profile Constancy)

MV EPID, kV Planar Imaging

  • Scaling
  • Spatial Resolution
  • Contrast
  • Noise
  • Uniformity

CBCT Imaging

  • HU Constancy & Contrast Visibility
  • Geometric Distortion
  • Spatial Resolution
  • Low Contrast Resolution
  • Noise
  • Uniformity

Full Description


The purpose of the TG-142 Check Phantom + iQA is to provide an efficient, budget-friendly constancy check workflow and data collection solution for monthly QA in accordance with the  AAPM TG-142 Protocol.


  • Clinical Physicists responsible for multiple machines at one site, or many sites
  • RO Networks seeking data-driven hardware and process monitoring to achieve standardization
  • LINAC manufacturers seeking a standardized and efficient solution for TG-142 implementation
  • Research  & Education organizations

Constancy Verification vs. Calibration

The TG-142 Phantom and iQA software is intended to be used as an independent and repeatable constancy verification solution to quickly determine:

  • Has my system deviated since last baseline calibration? To what extent?
  • Where are deviations occurring for hardware, software, processes?
  • Are these deviations acceptable within the scope of AAPM TG-142 as well as our internal clinical procedures?
  • How is the system at Site A performing in comparison to the system at Site B, C, D, etc?