Rigid and Non-Rigid Motion Compensation in Weight-Bearing CBCT of the Knee Using Simulated Inertial Measurements

Maier J, Nitschke M, Choi JH, Gold G, Fahrig R, Eskofier B, Maier A (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Book Volume: 69

Pages Range: 1608-1619

Journal Issue: 5

DOI: 10.1109/TBME.2021.3123673

Abstract

Objective: Involuntary subject motion is the main source of artifacts in weight-bearing cone-beam CT of the knee. To achieve image quality for clinical diagnosis, the motion needs to be compensated. We propose to use inertial measurement units (IMUs) attached to the leg for motion estimation. Methods: We perform a simulation study using real motion recorded with an optical tracking system. Three IMU-based correction approaches are evaluated, namely rigid motion correction, non-rigid 2D projection deformation and non-rigid 3D dynamic reconstruction. We present an initialization process based on the system geometry. With an IMU noise simulation, we investigate the applicability of the proposed methods in real applications. Results: All proposed IMU-based approaches correct motion at least as good as a state-of-the-art marker-based approach. The structural similarity index and the root mean squared error between motion-free and motion corrected volumes are improved by 24-35% and 78-85%, respectively, compared with the uncorrected case. The noise analysis shows that the noise levels of commercially available IMUs need to be improved by a factor of 105 which is currently only achieved by specialized hardware not robust enough for the application. Conclusion: Our simulation study confirms the feasibility of this novel approach and defines improvements necessary for a real application. Significance: The presented work lays the foundation for IMU-based motion compensation in cone-beam CT of the knee and creates valuable insights for future developments.

Authors with CRIS profile

Involved external institutions

Ewha Womans University / 이화여자대학교 Korea, Republic of (KR) Stanford University United States (USA) (US) Siemens AG, Healthcare Sector Germany (DE)

How to cite

APA:

Maier, J., Nitschke, M., Choi, J.H., Gold, G., Fahrig, R., Eskofier, B., & Maier, A. (2022). Rigid and Non-Rigid Motion Compensation in Weight-Bearing CBCT of the Knee Using Simulated Inertial Measurements. IEEE Transactions on Biomedical Engineering, 69(5), 1608-1619. https://doi.org/10.1109/TBME.2021.3123673

MLA:

Maier, Jennifer, et al. "Rigid and Non-Rigid Motion Compensation in Weight-Bearing CBCT of the Knee Using Simulated Inertial Measurements." IEEE Transactions on Biomedical Engineering 69.5 (2022): 1608-1619.

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