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<p>Metallic implants remain a major source of artifact formation in computed tomography (CT) imaging, yet the underlying material dependent attenuation mechanisms are not fully characterized. This study provides a comprehensive quantitative comparison of the photon-attenuation properties of cobalt–chromium–molybdenum (CoCrMo) and titanium–aluminum–vanadium (Ti–6Al–4V) orthopedic implant alloys using Monte Carlo N-Particle (MCNP6) simulations across the diagnostic energy range of 50–150&#xa0;keV, supported by theoretical data from the XCOM photon cross-section database. Radiation attenuation analysis showed that CoCrMo alloy provides higher shielding efficiency than Ti–6Al–4V alloy, which is consistent with the more pronounced computed tomography artifacts observed in patients with CoCrMo hemiarthroplasty implants. The excellent agreement between MCNP simulations and XCOM data (deviation &lt; 1%) validates the robustness of the simulation framework. These results demonstrate that alloy composition and density are primary determinants of photon material interactions and directly influence metal artifact severity, providing a physics-based rationale for material specific CT protocol optimization, implant selection considerations, and advanced artifact reduction strategies.</p>

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Assessment of radiation permeability of CoCrMo and Ti–6Al–4V implants by Monte Carlo simulation of mass attenuation coefficients

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Kamil Savaş,
  • Cüneyt May,
  • Atakan Küskün,
  • Yiğit Ali Üncü

摘要

Metallic implants remain a major source of artifact formation in computed tomography (CT) imaging, yet the underlying material dependent attenuation mechanisms are not fully characterized. This study provides a comprehensive quantitative comparison of the photon-attenuation properties of cobalt–chromium–molybdenum (CoCrMo) and titanium–aluminum–vanadium (Ti–6Al–4V) orthopedic implant alloys using Monte Carlo N-Particle (MCNP6) simulations across the diagnostic energy range of 50–150 keV, supported by theoretical data from the XCOM photon cross-section database. Radiation attenuation analysis showed that CoCrMo alloy provides higher shielding efficiency than Ti–6Al–4V alloy, which is consistent with the more pronounced computed tomography artifacts observed in patients with CoCrMo hemiarthroplasty implants. The excellent agreement between MCNP simulations and XCOM data (deviation < 1%) validates the robustness of the simulation framework. These results demonstrate that alloy composition and density are primary determinants of photon material interactions and directly influence metal artifact severity, providing a physics-based rationale for material specific CT protocol optimization, implant selection considerations, and advanced artifact reduction strategies.