Analysis of setup error in the head and neck cancer radiotherapy using cone-beam CT scanning

Jiang, S.; Qu, Y.; Bai, P.; Li, Q.; Chen, C.; Liu, L.; Fei, Z.

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi 29(5): 851-854

2012


ISSN/ISBN: 1001-5515
PMID: 23198420
Document Number: 657134
Cone-beam CT (CBCT) of Elekta can be used to analyze the setup errors in intensity modulated radiotherapy. A total of 240 patients with head and neck cancer were chosen in the period from October, 2009 to October, 2010. Their CBCT images were obtained after initial setup, and registered to the planning CT images, and then the setup errors on translational directions (X, Y, Z) and on rotational directions (U, V, W) were obtained and analyzed. The results showed that the setup errors on translational directions in Y-axis and Z-axis were larger than in X-axis, and the setup errors on rotational directions in Y-axis was much more obvious than those on the other two directions, which should be taken care during the patient daily setup. It may be concluded that the CBCT system can improve the precision for radiotherapy.

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