Impacts of registration parameters on accuracy of cone-beam computed tomography image-guided head and neck radiotherapy
10.3760/cma.j.issn.1004-4221.2016.04.019
- VernacularTitle:图像配准条件对头颈部CBCT引导放疗精度影响
- Author:
Botian HUANG
;
Dandan ZHANG
;
Yinglin PENG
;
Guangwen LUO
;
Ke YUAN
;
Xiaowu DENG
- Publication Type:Journal Article
- Keywords:
Scanning thickness;
Registration volumes;
Bone-based registration;
Accuracy
- From:
Chinese Journal of Radiation Oncology
2016;25(4):391-394
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the impacts of slice thickness and registration frame range on the accuracy of cone-beam computed tomography ( CBCT) image-guided head and neck ( HN) radiotherapy, and to provide a basis for positioning correction in image-guided radiotherapy.Methods A planned CT scan was performed for an anthropomorphic HN phantom with slice thickness of 1 mm and 3 mm and simulated positioning errors in x, y, and z directions on the accelerator.CBCT scan and reconstruction were performed with slice thickness of 1 mm and 3 mm.Two different registration frame ranges were used ( range 1:from C7 to superior orbit;range 2:from C7 to calvaria ) .Automatic bony registration was performed for CBCT and planned CT images with slice thickness of 1 mm and 3 mm.The registration accuracy was evaluated.Results For range 1, the registration errors in x, y, and z directions with a slice thickness of 1 mm were significantly lower than those with a slice thickness of 3 mm (0.5±0.2 mm vs.-0.7±0.2 mm, P=0.00;0.5±0.3 mm vs. 1.0±0.3 mm, P=0.00;-0.1±0.5 mm vs.1.5±0.5 mm, P=0.00).For range 2, the registration errors in x, y, and z directions with a slice thickness of 3 mm were-0.4±0.2 mm, 0.5±0.2 mm, and 0.7±0.4 mm, respectively.Conclusions Engagement of calvaria in registration range can substantially enhance the registration accuracy in CBCT or CT images for HN.The registration error with slice thickness of 1 mm can be controlled within 1 mm.
