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Practical projection angle in interventional examination and therapy for ischemic cerebrovascular disease

WANG Jin-long, LING Feng, LI Shen-mao, ZHU Feng-shui, SONG Qing-bin. Department of Interventional Radiology, Xuanwu Hospital, Capital University of Medical Sciences , Beijing 100053 , China  
Objective To study the best practical projection angle for clearly displaying the vasculopathy in the process of interventional examination and therapy of ischemic cerebrovascular diseases, and to provide precise imaging data. Methods One thousand patients of ischemic cerebrovascular disease were randomly collected and their angiographies angiograms of diagnosis and treatment and the best practical projection angle selected were analyzed. In this group,all images collected were in routine anteroposterior and lateral projections of the origins and intracranial segments of bilateral subclavian arteries, vertebral arteries, carotid arteries and some of them were only performed with oblique projection directly. Results The true lateral projection for basilar artery angusty was CAUD 28° ± 5°; RAO 25° ± 3°, LAO 25° ± 3°; LAO 25° ± 5° + CRAN 15° ± 5°; RAO 20° ± 5°; RAO 40° ± 7° + CAUD 20° ± 7°; LAO 50° ± 6°; RAO 15° ± 5°, LAO 15° ± 5°; and LAO 25° ± 5, RAO 25° ± 5° were the proper parameters of practical projection angles for displaying intracranial segment of vertebral artery, the right proximal segment of vertebral artery, the right subclavian artery, the left subclavian artery, the middle cerebral artery subterminal M1(horizontal segment) and the middle cerebral artery M1 near the bifurcation respectively. Conclusion Using the practical projection angle can display exact information of angiostenosis clearly, provide the best localization, help imaging diagnosis and interventional therapy of ischemic cerebrovascular disease.
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