基于电磁定位的超声图像与CT图像的融合方法

doi:10.3969/j.issn.0258-8021.2018.05.003

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Abstract In order to integrate multimodal images information to overcome the inadequacy of single ultrasonic image in ultrasound-guided percutaneous interventional therapy, we proposed a kind of fusion method of real-time ultrasonic image and CT image, aiming to get multimodal images information of patients′ lesions in the interventional therapy. First of all, obtained the magnetic field coordinates and CT image coordinates of 12 lead balls by using the electromagnetic positioning system to register the magnetic coordinate system to the CT image coordinate system by means ofiterative closest point (ICP) algorithm for two point sets. Secondly, electromagnetic positioning system was used to register the coordinate system of the electromagnetic sensor that was attached to the ultrasonic probe to the magnetic coordinate system. Then, using mechanical sizes of the ultrasonic probe to register the ultrasonic coordinate system to the coordinate system of the electromagnetic sensor. At last, through multiple coordinate system transformation between the ultrasonic coordinate system and the CT image coordinate system, real-time ultrasonic image was integrated to the CT image, and the fusion errors were measured in the software. In this method, the fusion error of real-time ultrasonic image and CT image was 0.71±0.03 mm, and the real-time fusion of the two kinds of images can be clearly seen in the software. In conclusion, this method can effectively integrate real-time ultrasonic image to CT image and provide technical support for the precision of interventional therapy.

Key words： interventional therapy electromagnetic positioning ultrasonic image CT image image fusion

Received: 30 November 2017

PACS:

R318

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	Articles by authors
	Guo Chu
	Liu Da
	Wu Wenbo
	Song Ling
	Zhang Sai

Cite this article:

Guo Chu,Liu Da,Wu Wenbo, et al. Method of US-CT Fusion Based on Electromagnetic Positioning[J]. Chinese Journal of Biomedical Engineering, 2018, 37(5): 529-536.

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http://cjbme.csbme.org/EN/10.3969/j.issn.0258-8021.2018.05.003 OR http://cjbme.csbme.org/EN/Y2018/V37/I5/529

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