title: [Analysis of setup error in the head and neck cancer radiotherapy using cone-beam CT scanning].
abstract: 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.
authors.affiliation: Department of Radiation Oncology, Fujian Provincial Tumor Hospital Affiliated to Fujian Medical University, Fuzhou 350014, China.
authors.forename: Sisi
authors.initials: S
authors.lastname: Jiang
authors.forename: Yiyan
authors.initials: Y
authors.lastname: Qu
authors.forename: Penggang
authors.initials: P
authors.lastname: Bai
authors.forename: Qixin
authors.initials: Q
authors.lastname: Li
authors.forename: Chuanben
authors.initials: C
authors.lastname: Chen
authors.forename: Libin
authors.initials: L
authors.lastname: Liu
authors.forename: Zhaodong
authors.initials: Z
authors.lastname: Fei
mesh_terms: D054893:Cone-Beam Computed Tomography / Q000379:methods; D006258:Head and Neck Neoplasms / Q000000981:diagnostic imaging* / Q000532:radiotherapy*; D006801:Humans; D061106:Radiotherapy Setup Errors / Q000517:prevention & control / Q000706:statistics & numerical data*; D050397:Radiotherapy, Intensity-Modulated