自制定位装置对喉癌CT-MRI图像放疗靶区勾画影响

doi:10.3760/cma.j.issn.1004-4221.2016.09.017

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Abstract Objective To investigate the application of a self-made positioning device in CT-MRI image fusion in patients with laryngeal tumor, as well as the precision of image fusion and the changes in target volume delineation after fusion. Methods A total of 10 patients with laryngeal cancer were enrolled, and a self-made positioning device was used to collect CT and MRI images in a fixed position. These images were fused by mutual information combined with manual fusion. The precision of image fusion was assessed by the positional deviation of internal and external markers and degree of gross tumor volume (GTV) overlap (P_CT-MRI) between CT and MRI images. GTV was contoured based on CT images (V_CT), MRI images (V_MRI), and fused images (V_CT+MRI). The overlapped volume of V_CT and V_MRI(V_CT-MRI) was calculated, and the target volume was analyzed and compared. Results The positional deviations of three external markers in the three directions were 0.996±0.222 mm, 1.146±0.291 mm, and 1.368±0.298 mm (P=0.000), respectively, while those of the internal markers were 0.476±0.151 mm, 0.561±0.083 mm, and 0.724±0.125 mm (P=0.000), respectively. V_CT, V_MRI, V_CT+MRI, and V_CT-MRI were 26.355±7.876 cm³, 33.556±7.407 cm³, 40.036±7.627 cm³, 19.875±8.588 cm³(P=0.000), respectively. P_CT-MRI was 73.7%±9.8%. Conclusions The self-made positioning device can improve the consistency of position during the collection of CT and MRI images, and fused CT-MRI images can provide more information and improve the precision of target volume delineation.

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	Zheng Xuliang
	Xing Xiaofen
	Cui Tong
	Wang Dandan
	Chu Xuegang

Key words： Tomography X-ray computed Magnetic resonance imaging Image registration Laryngeal neoplasms/radiotherapy Self-made positioning device

Received: 22 April 2015

Corresponding Authors: XIng Xiaofen,Email:tyxxf@126.com

Cite this article:

Zheng Xuliang,Xing Xiaofen,Cui Tong et al. Application of a self-made positioning device in laryngeal CT-MRI image fusion[J]. Chinese Journal of Radiation Oncology, 2016, 25(9): 980-983.

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http://journal12.magtechjournal.com/Jweb_fszlx/EN/10.3760/cma.j.issn.1004-4221.2016.09.017 OR http://journal12.magtechjournal.com/Jweb_fszlx/EN/Y2016/V25/I9/980

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