Error in the parotid contour delineated using computed tomography images rather than magnetic resonance images during radiotherapy planning for nasopharyngeal carcinoma
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- 作者：Chengxin Liu (1)
Xudong Kong (2)
Guanzhong Gong (1)
Tonghai Liu (1)
Baosheng Li (1)
Yong Yin (1) - 关键词：Parotid ; Radiotherapy ; Nasopharyngeal carcinoma ; Variation ; Inter ; and intraobserver
- 刊名：Japanese Journal of Radiology
- 出版年：2014
- 出版时间：April 2014
- 年：2014
- 卷：32
- 期：4
- 页码：211-216
- 全文大小：396 KB
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Xudong Kong (2)
Guanzhong Gong (1)
Tonghai Liu (1)
Baosheng Li (1)
Yong Yin (1)
1. Department of Radiation Oncology, Shandong’s Key Laboratory of Radiation Oncology, Shandong Cancer Hospital, School of Medicine and Life Sciences, University of Jinan and Shandong Academy of Medical Sciences, JiYan Road 440, Jinan, 250117, Shandong, China
2. Department of Radiation Oncology, Wuxi No.4 Hospital, Hui He Road 200, Wuxi, China - ISSN：1867-108X
文摘
Purpose To analyze the intra- and interobserver variations errors in the parotid contour delineated using computed tomography (CT) or magnetic resonance (MR) images of patients with nasopharyngeal carcinoma who underwent radiotherapy. Materials and methods Forty-one nasopharyngeal cancer patients were selected. The patients underwent simulation with MR and CT scanning. The gross tumor volume and organs at risk were contoured on both contrasted CT and T1-MR images. For each patient, one radiotherapist delineated the parotid on CT and MR images ten times, and ten different radiotherapists were asked to delineate the parotid on CT and MR images once each. The inter- and intraobserver variations in volume and outline were compared. Results For the interobserver comparison, the volumes of the parotid as evaluated from the CT and MR images were 34.6?±?12.1?cm3 (left), 34.3?±?9.0?cm3 (right), and 24.6?±?7.6?cm3 (L), 23.2?±?8.1?cm3 (R), respectively. For the intraobserver comparison, the volumes evaluated from the CT and MR images were 28.2?±?7.6?cm3 (L), 29.4?±?9.4?cm3 (R), and 24.4?±?7.6?cm3 (L), 22.5?±?7.4?cm3 (R), respectively. The relative variations in volume when using MR images were 4.7?±?0.7?% (L), 5.0?±?0.6?% (R) for the interobserver variations and 2.3?±?0.4?% (L), 2.1?±?0.7?% (R) for the intraobserver variations. However, the inter- and intraobserver relative variations in volume when using CT images were 18.0?±?4.8?% (L), 17.4?±?4.6?% (R) and 6.3?±?1.5?% (L), 6.8?±?1.5?% (R), respectively. Conclusion The parotid contour is delineated more accurately and reproducibly on MR images than on CT images.