Van den Broeck Joyce, Vereecke Evie, Wirix-Speetjens Roel, Vander Sloten Jos
KU Leuven, Biomechanics Section, Celestijnenlaan 300C, 3001 Leuven, Belgium; Materialise NV, Technologielaan 15, 3001 Leuven, Belgium.
KU Leuven, Department of Development & Regeneration @ Kulak, Etienne Sabbelaan 53, 8500 Kortrijk, Belgium.
Med Eng Phys. 2014 Jul;36(7):949-53. doi: 10.1016/j.medengphy.2014.03.016. Epub 2014 Apr 24.
The use of three-dimensional imaging methodologies in new applications in the orthopaedic field has introduced a need for high accuracy, in addition to a correct diagnosis. The aim of this study was to quantify the absolute dimensional errors between models reconstructed from computed tomography and magnetic resonance images compared to a ground truth for various regions of the bone. Clinical CT and MRI scans were acquired from nine lower leg cadavers and the bones were subsequently cleaned from soft tissues. 3D models of the tibia were created from the segmented CT and MRI images and compared to optical scans of the cleaned bones (considered as ground truth). The 3D reconstruction using CT images resulted in an RMS error of 0.55 mm, corresponding to an overestimated CT bone model compared to the cleaned bone. MR imaging resulted in an RMS error of 0.56 mm; however, the MRI bone model was on average a small underestimation of the cleaned bone. Different regions of the bones were analysed, indicating a difference in accuracy between diaphysis and epiphysis. This study demonstrates a high accuracy for both CT and MRI imaging, supporting the feasibility of using MRI technology for the 3D reconstruction of bones in medical applications.
在骨科领域的新应用中，三维成像方法的使用除了需要正确诊断外，还引入了对高精度的需求。本研究的目的是量化从计算机断层扫描（CT）和磁共振成像（MRI）重建的模型与骨骼各个区域的真实情况相比的绝对尺寸误差。从九具小腿尸体获取临床CT和MRI扫描图像，随后将骨骼上的软组织清理掉。从分割后的CT和MRI图像创建胫骨的三维模型，并与清理后的骨骼的光学扫描图像（视为真实情况）进行比较。使用CT图像进行三维重建的均方根误差为0.55毫米，这表明与清理后的骨骼相比，CT骨模型被高估了。MRI成像的均方根误差为0.56毫米；然而，MRI骨模型平均而言对清理后的骨骼略有低估。对骨骼的不同区域进行了分析，结果表明骨干和骨骺之间的精度存在差异。本研究证明了CT和MRI成像的高精度，支持了在医学应用中使用MRI技术进行骨骼三维重建的可行性。
