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On the Response of a Micro Non-Destructive Testing X-ray Detector.

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Summary

This study evaluates a 20 μm pixel pitch CMOS sensor (RadEye HR) with a scintillator screen. The detector shows excellent linearity and high detective quantum efficiency (DQE), offering superior resolution for imaging applications.

Keywords:
CMOSDQEGd2O2S:TbIEC 62220-1-1:2015ZnSe:Teimagingnon-destructive testingscintillators

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Area of Science:

  • Medical Physics
  • Imaging Technology
  • Materials Science

Background:

  • Advanced CMOS sensors are crucial for high-resolution imaging.
  • Evaluating imaging performance metrics ensures detector suitability for specific applications.
  • The RadEye HR sensor with a Gd2O2S:Tb scintillator represents a state-of-the-art system.

Purpose of the Study:

  • To assess the imaging performance of a 20 μm pixel pitch CMOS sensor (RadEye HR) coupled with a Gd2O2S:Tb scintillator.
  • To compare its resolution capabilities against other commercial CMOS sensors.
  • To explore its potential applications in industrial inspection and medical imaging, including dual-energy imaging.

Main Methods:

  • Performance metrics including signal transfer property (STP), modulation transfer function (MTF), normalized noise power spectrum (NNPS), and detective quantum efficiency (DQE) were measured.
  • Measurements followed the IEC 62220-1-1:2015 standard.
  • Resolution capabilities were benchmarked against other commercial CMOS sensors.

Main Results:

  • The detector demonstrated excellent linearity with an R² of 0.9978.
  • The detective quantum efficiency (DQE) peaked at 33% and maintained 10% at 3 cycles/mm.
  • Resolution capabilities were superior to other commercial CMOS sensors, except for a previous RadEye HR model.

Conclusions:

  • The 20 μm pixel pitch RadEye HR sensor offers high performance suitable for demanding imaging tasks.
  • Its resolution and efficiency make it a strong candidate for industrial inspection.
  • Further investigation into its medical imaging and dual-energy applications is warranted.