Experimental and clinical investigation in the determination of projection angle for rotational DSA
SUN Li jun, ZHANG Xue xin, BAI Hong tao, HE Hong de, YU Hou jun, MU Xuan qin, LI Jing bangDepartment of Radiology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
Objective: To study the determination of projection angle for rotational DSA. Materials and Methods: Several rotational data were obtained using a Philips V5000 digital imaging system by phantom experiment and a mathematic expression was produced which describes approximately running rule of the angiographic unit, and then each projection angle was calculated by a programmable handset. Results: Projection angle of each interested image was calculated immediately by the handset in all rotational DSAs of 28 cases. The calculated images in showing the origin, running, distribution and contour of the diseased segments of arteries and abnormal shunts are comparable with the optimal images in rotational imagings. Conclusion: Determination of the projection angle in rotational images is of significance in ensuring the safety and success of interventional performance.