用KV-CBCT探讨两种下肢固定方法对直肠癌IMRT摆位误差影响

doi:10.3760/cma.j.issn.1004-4221.2016.09.010

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Abstract Objective To investigate the influence of fixation of both lower limbs with negative pressure vacuum cushion and fixation of both ankles with self-made foam mat on setup errors in radiotherapy for rectal cancer. Methods A total of 12 patients with rectal cancer were enrolled in 2014 and randomly divided into group A (using negative pressure vacuum cushion) and group B (using self-made foam mat).An offline registration analysis was performed for the images of 108 times (A,B group of 54 times) of kilovoltage cone-beam CT (CBCT) before and after treatment. Grey scale translation error registration was used, and the results of registration were analyzed. The setup errors in x-axis (left-right direction), y-axis (cranial-caudal direction), and z-axis (anterior-posterior direction) were compared between the two groups. Results There was no significant difference in the absolute setup error in the y-axis between the two groups (2.13±0.64 mm vs.2.61±1.17 mm,P=0.399), while group A showed significantly lower absolute setup errors in the x-axis and z-axis than group B (x-axis:1.51±0.28 mm vs. 2.70±1.05 mm,P=0.039;with an error rate of 7.41% vs. 42.59%;z-axis:1.10±0.29 mm vs. 2.37±0.71 mm,P=0.002;with an error rate of 1.85% vs. 35.19%). Conclusions In the radiotherapy positioning for rectal cancer, fixation of both lower limbs with negative pressure vacuum cushion effectively avoids the translation and rotation of both lower limbs, reduces absolute setup errors, and has higher accuracy than fixation of both ankles with self-made foam mat.

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	Articles by authors
	Meng Yiran
	Xu Qing
	Zhang Zhen
	Gong Min
	Ren Jun

Key words： Tomography X-ray computed cone beam kilovolt Negative pressure vacuum cushion fixation Self-made foam mat fixation Set-up error Rectal neoplasms/radiotherapy

Received: 01 December 2015

Corresponding Authors: Xu Qing,Email:qingxu68@hotmail.com

Cite this article:

Meng Yiran,Xu Qing,Zhang Zhen et al. Influence of lower limb movements on setup errors in radiotherapy for rectal cancer using kilovoltage cone-beam CT (KV-CBCT)[J]. Chinese Journal of Radiation Oncology, 2016, 25(9): 955-957.

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http://journal12.magtechjournal.com/Jweb_fszlx/EN/10.3760/cma.j.issn.1004-4221.2016.09.010 OR http://journal12.magtechjournal.com/Jweb_fszlx/EN/Y2016/V25/I9/955

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