Automatic Segmentation of the Ribs, the Vertebral Column, and the Spinal Canal in Pediatric Computed Tomographic Images
Automatic Segmentation of the Ribs, the Vertebral Column, and the Spinal Canal in Pediatric Computed Tomographic Images
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DOI：
10.1007/s10278-009-9176-x
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发表时间：
2010-06-01
影响因子：
4.4
通讯作者：
Boag, Graham S.
中科院分区：
文献类型：
--
作者：
Banik, Shantanu;Rangayyan, Rangaraj M.;Boag, Graham S.
我们提出的方法来执行自动识别的肋骨结构，脊柱和椎管中的计算机断层扫描（CT）图像的儿科患者。肋骨结构和脊柱的分割过程开始使用多级阈值，并使用基于放射学和解剖学先验知识的特征的形态学图像处理技术对结果进行细化。将用于检测圆的霍夫变换应用于包括胸椎结构的裁剪边缘图。检测到的圆的中心用于推导用于分割椎管的重建打开算法所需的信息。对13例患者的39次CT检查的方法进行了测试;通过与由放射科医生独立进行的分割进行比较，对脊柱和椎管的分割结果进行了定量和定性评估。使用6名患者的13次CT检查，包括来自脊柱不同节段的椎骨的总共458个切片，确定平均Hausdorff距离为3.2mm，标准差（SD）为2.4mm;到最近点的平均距离（MDCP）为0.7 mm，SD =对3例患者的3次CT检查，包括21个层面的脊柱不同节段的椎管进行了定量分析;平均Hausdorff距离为1.6 mm，SD = 0.5 mm，平均MDCP为0.6 mm，SD = 0.1 mm。
We propose methods to perform automatic identification of the rib structure, the vertebral column, and the spinal canal in computed tomographic (CT) images of pediatric patients. The segmentation processes for the rib structure and the vertebral column are initiated using multilevel thresholding and the results are refined using morphological image processing techniques with features based on radiological and anatomical prior knowledge. The Hough transform for the detection of circles is applied to a cropped edge map that includes the thoracic vertebral structure. The centers of the detected circles are used to derive the information required for the opening-by-reconstruction algorithm used to segment the spinal canal. The methods were tested on 39 CT exams of 13 patients; the results of segmentation of the vertebral column and the spinal canal were assessed quantitatively and qualitatively by comparing with segmentation performed independently by a radiologist. Using 13 CT exams of six patients, including a total of 458 slices with the vertebra from different sections of the vertebral column, the average Hausdorff distance was determined to be 3.2 mm with a standard deviation (SD) of 2.4 mm; the average mean distance to the closest point (MDCP) was 0.7 mm with SD = 0.6 mm. Quantitative analysis was also performed for the segmented spinal canal with three CT exams of three patients, including 21 slices with the spinal canal from different sections of the vertebral column; the average Hausdorff distance was 1.6 mm with SD = 0.5 mm, and the average MDCP was 0.6 mm with SD = 0.1 mm.