Humbert L, De Guise J A, Aubert B, Godbout B, Skalli W
Laboratoire de Biomécanique, Arts et Métiers ParisTech - CNRS, Paris, France.
Med Eng Phys. 2009 Jul;31(6):681-7. doi: 10.1016/j.medengphy.2009.01.003. Epub 2009 Feb 20.
Reconstruction methods from biplanar X-rays provide 3D analysis of spinal deformities for patients in standing position with a low radiation dose. However, such methods require an important reconstruction time and there is a clinical need for fast and accurate techniques. This study proposes and evaluates a novel reconstruction method of the spine from biplanar X-rays. The approach uses parametric models based on longitudinal and transversal inferences. A first reconstruction level, dedicated to routine clinical use, allows to get a fast estimate (reconstruction time: 2 min 30 s) of the 3D reconstruction and accurate clinical measurements. The clinical measurements precision (evaluated on asymptomatic subjects, moderate and severe scolioses) was between 1.2 degrees and 5.6 degrees. For a more accurate 3D reconstruction (complex pathologies or research purposes), a second reconstruction level can be obtained within a reduced reconstruction time (10 min) with a fine adjustment of the 3D models. The mean shape accuracy in comparison with CT-scan was 1.0 mm. The 3D reconstruction method precision was 1.8mm for the vertebrae position and between 2.3 degrees and 3.9 degrees for the orientation. With a reduced reconstruction time, an improved accuracy and precision and a method proposing two reconstruction levels, this approach is efficient for both clinical routine uses and research purposes.
双平面X射线重建方法可在低辐射剂量下对站立位患者的脊柱畸形进行三维分析。然而，此类方法需要较长的重建时间，临床上需要快速且准确的技术。本研究提出并评估了一种从双平面X射线重建脊柱的新方法。该方法使用基于纵向和横向推断的参数模型。第一个重建级别用于常规临床应用，可快速估计三维重建结果（重建时间：2分30秒）并进行准确的临床测量。临床测量精度（在无症状受试者、中度和重度脊柱侧弯患者中评估）在1.2度至5.6度之间。对于更精确的三维重建（复杂病变或研究目的），可在缩短的重建时间（10分钟）内通过对三维模型进行精细调整获得第二个重建级别。与CT扫描相比，平均形状精度为1.0毫米。椎体位置的三维重建方法精度为1.8毫米，方向精度在2.3度至3.9度之间。该方法重建时间缩短，精度和准确性提高，且提供两个重建级别，对临床常规应用和研究目的均有效。
