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Related Experiment Video

Updated: Sep 2, 2025

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High-dynamic-range micro-CT for nondestructive testing of titanium 3D-printed medical components.

Santiago Fabian Cobos1, Christopher James Norley2, Steven Ingo Pollmann2

  • 1University of Western Ontario, Schulich School of Medicine and Dentistry, Department of Medical Biophysics, London, Ontario, Canada.

Journal of Medical Imaging (Bellingham, Wash.)
|August 5, 2022
PubMed
Summary

A new dual-exposure technique enhances the dynamic range of low-cost micro-CT scanners. This high-dynamic-range CT (HDR-CT) improves nondestructive testing (NDT) of 3D-printed metal medical parts by increasing signal in highly attenuated areas.

Keywords:
additive manufacturinghigh-dynamic-range radiographylaser powder bed fusionmicro-CT imagingnondestructive testingx-ray imaging

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Area of Science:

  • Medical Imaging
  • Materials Science
  • Non-Destructive Testing (NDT)

Background:

  • Industrial micro-CT scanners are vital for NDT of 3D-printed medical components but often require expensive, high-energy X-ray sources.
  • Low-cost X-ray units are limited by signal loss in highly attenuating materials, causing artifacts and unreliable NDT.
  • Existing limitations make routine NDT of metal medical components prohibitively expensive.

Purpose of the Study:

  • To develop and implement a dual-exposure technique to extend the dynamic range (DR) of a low-energy micro-CT scanner.
  • To improve the signal-to-noise ratio in highly attenuated regions for NDT of 3D-printed medical components.
  • To enable cost-effective NDT of metal medical parts using accessible X-ray technology.

Main Methods:

  • Implemented a high-dynamic-range CT (HDR-CT) technique by combining projection images from two exposure levels, adjusting integration times.
  • Evaluated the HDR-CT technique using titanium-alloy test samples, including a resolution phantom and porous cylinders with varying porosities (60-90%).
  • Assessed improvements in void visualization and overall image quality compared to conventional CT scans.

Main Results:

  • The HDR-CT technique effectively increased the scanner's native 12-bit dynamic range to an effective 14-16 bits.
  • Projection images acquired at two exposure levels were successfully combined, enhancing signal in high-attenuation areas.
  • Void visualization and image conspicuity were significantly improved in HDR-CT reconstructions.

Conclusions:

  • The HDR-CT technique successfully extends the dynamic range of low-cost micro-CT systems.
  • This method offers improved contrast-to-noise ratio and defect visualization for NDT of 3D-printed metal medical components.
  • HDR-CT presents a promising, cost-effective solution for routine NDT of medium-sized titanium-alloy medical parts.