HT系统MVCT图像不同采集间距及配准条件对鼻咽癌放疗精度影响

doi:10.3760/cma.j.issn.1004-4221.2018.10.012

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Abstract

Objective To evaluate the effect of helical tomotherapy (HT) megavoltage CT (MVCT) under different acquisition pitch and registration conditions upon the accuracy of radiotherapy for used nasopharyngeal carcinoma,aiming to provide reference for image-guided radiotherapy (IGRT) for nasopharyngeal carcinoma. Methods MVCT scans were performed on an anthropomorphic head& neck phantom which was simulated the positioning errors in the x,y and z direction. The obtained images were registered with the planning CT images. Acquisition pitch was set as the coarse,normal and fine modes. Registration conditions were set as bone registration,bone and soft tissue registration and full-image registration. Registration accuracy was determined by comparing the measured value with the preset value. The accuracy of radiotherapy under different acquisition pitch and registration conditions was statistically compared. Results The 3D errors of bone,bone and soft tissue and full-image registration under different acquisition pitch (coarse,normal and fine) were (1.51±0.47,1.54±0.35,1.81±0.53) mm and (1.41±0.37,1.53±0.36,1.56±0.39) mm and (1.51±0.27,1.57±0.32,1.73±0.33) mm,respectively. The bone registration yielded the highest accuracy (P<0.05).When the registration condition was set as bone registration,the accuracy of three acquisition pitch did not significantly differ (all P>0.05).The fine mode of acquisition pitch possessed the highest stability,whereas required the longest time. Conclusion The acquisition pitch and registration conditions should be selected during HT MVCT based on the clinical requirement of each patient with nasopharyngeal carcinoma.

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	Articles by authors
	He Huilang
	Chen Xuanguang
	Liu Hui
	Xu Senkui
	Lin Chengguang

Key words： Nasopharyngeal neoplasms/helical tomotherapy Acquisition pitch Registration condition Accuracy

Received: 27 September 2017

Corresponding Authors: Lin Chengguang,Email: linchg@sysucc.org.cn

Cite this article:

He Huilang,Chen Xuanguang,Liu Hui et al. Effect of helical tomotherapy megavoltage CT under different acquisition pitch and registration conditions on the accuracy of radiotherapy for nasopharyngeal carcinoma[J]. Chinese Journal of Radiation Oncology, 2018, 27(10): 930-932.

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http://journal12.magtechjournal.com/Jweb_fszlx/EN/10.3760/cma.j.issn.1004-4221.2018.10.012 OR http://journal12.magtechjournal.com/Jweb_fszlx/EN/Y2018/V27/I10/930

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