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CT scans through metal scanning technique versus hardware composition

N Haramati1, R B Staron, K Mazel-Sperling

  • 1Department of Radiology, Albert Einstein College of Medicine, Bronx, NY 10467.

Computerized Medical Imaging and Graphics : the Official Journal of the Computerized Medical Imaging Society
|November 1, 1994
PubMed
Summary
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Titanium prostheses offer superior bone detail on CT scans compared to cobalt-chrome. Higher kVp or extended scan arcs did not improve image quality around metal implants.

Area of Science:

  • Medical Imaging
  • Radiology
  • Biomedical Engineering

Background:

  • Streak artifacts on CT scans of metal implants are a persistent challenge.
  • Existing artifact reduction methods often require specialized equipment or complex, non-automated calculations.
  • Higher beam energy in CT has shown potential for imaging thicker metal without significant image degradation.

Purpose of the Study:

  • To evaluate the image quality of bone surrounding metal prostheses using different CT scanning techniques.
  • To compare titanium and cobalt-chrome prostheses regarding image quality of adjacent bone.
  • To assess the impact of varying kVp and scan arc on CT image quality in the presence of metal.

Main Methods:

  • A double-blind survey of 28 radiology professionals assessed image quality.

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  • CT scans were performed on titanium, cobalt-chrome, and stainless steel implants.
  • Scans utilized varying techniques: 120 kVp, 140 kVp with different mA, s, and 360 vs. 420-degree rotation.

    • Main Results:

    • Titanium prostheses demonstrated significantly superior bone detail compared to cobalt-chrome (p < .0001).
    • No discernible advantage was found for higher kVp settings.
    • An increased scan arc of 420 degrees offered no improvement over the standard 360 degrees.

    Conclusions:

    • Titanium implants provide better visualization of surrounding bone on CT scans than cobalt-chrome implants.
    • Current CT techniques utilizing higher kVp or extended scan arcs do not enhance image quality around metal implants.
    • Optimizing CT parameters for metal artifact reduction requires further investigation beyond kVp and scan arc adjustments.