期刊论文

中文

轧钢

1003-9996

2016

25

2

206-208

10.13491/j.cnki.issn.1004-714x.2016.02.028

2015湖南省重点研发计划（2015SK2022）；

本校为第一机构

目的 应用机载千伏级锥形束CT(CBCT)分析鼻咽癌调强放射治疗的摆位误差.方法 本研究选取32例IM-RT的鼻咽癌患者,治疗过程中每周一次治疗前行CBCT扫描,获取的CBCT图像和CT图像匹配后得出三维方向上的平移误差.结果 摆位误差绝对值分别为左右(1.50±0.87)mm,头脚(1.59±0.87) mm,腹背(1.95±0.99)mm,根据van Herk公式计算得到各个方向的fPTV外扩值分别为左右2.9 mm、头脚4.5 mm、腹背3.1mm.结论 建议PTV不均匀外扩;腹背方向摆位误差较左右、头脚方向大,在摆位中应注意误差大的方向,提高摆位的准确性.

Objective To analyze the setup errors using Kilovohage X - ray cone - beam CT imaging in nasopharyngeal carcinoma treated by intensity modulated radiotherapy. Methods 32 patients diagnosed with nasopharyngeal carcinoma and treated with IMRT were selected. Kilovoltage cone - beam scan was performed weekly before treatment. The setup errors on trans-lational directions （X, Y, Z） were obtained by matching the CBCT images and the planning CT images. Results The average errors were （ 1.50 ± 0.87 ） mm, （ 1.59 ± 0.87 ） mm and （ 1.95 ± 0.99 ）...