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Objectives <p>To evaluate whether a dedicated, anatomically realistic knee phantom with orthopedic implants can be used to optimize clinical MRI sequences under realistic metallic conditions and to assess whether phantom-optimized sequences improve image quality compared with routine protocols.</p> Materials and methods <p>A 3D-printed knee phantom integrating a titanium screw and a stainless-steel fixation plate was developed. Phantom imaging was performed on a clinical 1.5&#xa0;T MRI system. In this exploratory proof-of-concept study, T1w and STIR sequences were iteratively optimized using the phantom and compared with vendor-default and routine clinical protocols. The phantom-optimized sequences were subsequently applied in three asymptomatic volunteers with metallic knee implants and compared with routine sequences. Image quality was independently assessed by four blinded readers using a 5-point Likert scale across spatial resolution, artifact reduction, and overall image quality.</p> Results <p>Phantom-optimized sequences achieved significantly higher image quality scores compared with routine protocols. Improvements were consistent across all three predefined criteria: spatial resolution (mean increase +0.70 points, <i>p</i> &lt; 0.001), artifact reduction (+0.65, <i>p</i> &lt; 0.001), and overall image quality (+0.78, <i>p</i> &lt; 0.001). These gains were observed for both T1-weighted and STIR acquisitions without extending acquisition times.</p> Conclusion <p>Phantom-guided optimization provides a reproducible, patient-independent framework for tuning MRI protocols near orthopedic hardware. Anatomically realistic phantoms represent a promising methodological tool for developing, testing, and standardizing MRI sequences under controlled and clinically relevant conditions.</p>

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Optimizing knee MRI near orthopedic hardware using a 3D-printed anatomical phantom

  • 期刊论文

  • 发表日期：

    2026年1月27日

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  • William Tracqui,
  • Habeeb Yusuff,
  • Lucile Hausser,
  • Alice Tournayre,
  • Guillaume Bierry,
  • Jean-Philippe Dillenseger,
  • Thibault Willaume

摘要

Objectives

To evaluate whether a dedicated, anatomically realistic knee phantom with orthopedic implants can be used to optimize clinical MRI sequences under realistic metallic conditions and to assess whether phantom-optimized sequences improve image quality compared with routine protocols.

Materials and methods

A 3D-printed knee phantom integrating a titanium screw and a stainless-steel fixation plate was developed. Phantom imaging was performed on a clinical 1.5 T MRI system. In this exploratory proof-of-concept study, T1w and STIR sequences were iteratively optimized using the phantom and compared with vendor-default and routine clinical protocols. The phantom-optimized sequences were subsequently applied in three asymptomatic volunteers with metallic knee implants and compared with routine sequences. Image quality was independently assessed by four blinded readers using a 5-point Likert scale across spatial resolution, artifact reduction, and overall image quality.

Results

Phantom-optimized sequences achieved significantly higher image quality scores compared with routine protocols. Improvements were consistent across all three predefined criteria: spatial resolution (mean increase +0.70 points, p < 0.001), artifact reduction (+0.65, p < 0.001), and overall image quality (+0.78, p < 0.001). These gains were observed for both T1-weighted and STIR acquisitions without extending acquisition times.

Conclusion

Phantom-guided optimization provides a reproducible, patient-independent framework for tuning MRI protocols near orthopedic hardware. Anatomically realistic phantoms represent a promising methodological tool for developing, testing, and standardizing MRI sequences under controlled and clinically relevant conditions.