Assessment of consistency in contouring of normal-tissue anatomic structures.
Assessment of consistency in contouring of normal-tissue anatomic structures.
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DOI：
10.1120/1.1521271
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发表时间：
2003-01-01
影响因子：
2.1
通讯作者：
Starkschall, George
中科院分区：
文献类型：
--
作者：
Collier, Dawn C;Burnett, Stuart S C;Starkschall, George
这项工作的目的是估计的不确定性，在手动轮廓的正常解剖结构。心脏，食道和脊髓轮廓手动六套计算机断层扫描图像由六个剂量师，其经验范围从1年到超过15年。为了确定观察者间和观察者内变化之间的差异，每个数据集由其中一名剂量测定师绘制五次轮廓，由其他五名剂量测定师绘制一次轮廓。评估了轮廓描绘的差异程度。剂量测定师内轮廓差异如下：食管，平均0.3 cm，最大2.9 cm;心脏，平均0.5 cm，最大7.6 cm;脊髓，平均0.1 cm，最大0.7 cm。剂量测量师间轮廓差异如下：食管，平均0.4 cm，最大3.1 cm;心脏，平均0.7 cm，最大8.1 cm;脊髓，平均0.2 cm，最大0.9 cm。当手动勾画正常解剖结构轮廓时，可能会出现显著差异。剂量测定员间差异通常略大于剂量测定员内差异。差异的幅度似乎与剂量测定师的经验无关。
The purpose of this work is to estimate the uncertainty in the manual contouring of normal anatomical structures. The heart, esophagus, and spinal cord were contoured manually on six sets of computed tomography images by six dosimetrists whose experience ranged from 1 year to over 15 years. To determine the differences between inter- and intraobserver variations, each data set was contoured by one of the dosimetrists five times and once each by the five other dosimetrists. The magnitude of the discrepancies in delineating the contours was assessed. Intradosimetrist contouring discrepancies were as follows: esophagus, average 0.3 cm and maximum 2.9 cm; heart, average 0.5 cm and maximum 7.6 cm; and spinal cord, average 0.1 cm and maximum 0.7 cm. Interdosimetrist contouring discrepancies were as follows: esophagus, average 0.4 cm and maximum 3.1 cm; heart, average 0.7 cm and maximum 8.1 cm; and spinal cord, average 0.2 cm and maximum 0.9 cm. Significant discrepancies can occur when normal anatomic structures are contoured manually. Interdosimetrist discrepancies are typically slightly greater than intradosimetrist discrepancies. The magnitude of the discrepancies does not appear to be correlated to the experience of the dosimetrist.