Comparative accuracy of lower limb bone geometry determined using MRI, CT, and direct bone 3D models.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
Joanna M StephenHadi El Daou

Abstract

Advancements in imaging and segmentation techniques mean that three dimensional (3D) modeling of bones is now increasingly used for preoperative planning and registration purposes. Computer tomography (CT) scans are commonly used due to their high bone-soft tissue contrast, however they expose subjects to radiation. Alternatively, magnetic resonance imaging (MRI) is radiation-free: however, geometric field distortion and poor bone contrast have been reported to degrade bone model validity compared to CT. The present study assessed the accuracy of 3D femur and tibia models created from "Black Bone" 3T MRI and high resolution CT scans taken from 12 intact cadaveric lower limbs by comparing them with scans of the de-fleshed and cleaned bones carried out using a high-resolution portable compact desktop 3D scanner (Model HDI COMPACT C210; Polyga). This scanner used structured light (SL) to capture 3D scans with an accuracy of up to 35 μm. Image segmentation created 3D models and for each bone the corresponding CT and MRI models were aligned with the SL model using the iterative closest point (ICP) algorithm and the differences between models calculated. Hausdorff distance was also determined. Compared to SL scans, the CT models had ...Continue Reading

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Citations

Apr 11, 2021·The International Journal of Medical Robotics + Computer Assisted Surgery : MRCAS·Zheng LiJin Lin
Jul 1, 2021·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Mateusz C FlorkowPeter R Seevinck

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