Semi-automatic segmentation of coronary vessels in Digital Subtraction Angiography (DSA) images is more practical than fully automatic segmentation. In this paper, a novel algorithm is proposed to extract coronary vessels semi-automatically. This algorithm is a combination of the traditional livewire algorithm and the gradient vector flow-Frangi (GVF-Frangi) filter. Results showed that the proposed approach is more robust and effective in the semi-automatic segmentation of coronary vessels than the traditional livewire algorithm.

Main usage of artillery electrical system and its requirements on measurement and control system in design approval test are illustrated. Composition and working principle of measurement and control system for electrical performance parameters of gun based on Ethernet and GPIB are introduced. Design of hardware and software for measurement and control system is studied with emphasis. Technical difficulties as generality of control equipments and security of firing test existed in type approval test for artillery electrical system are solved. Operating interface for man-machine interaction is designed in software program. Practical application has shown that the system meet with the design indices.

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