Comparison of subtraction CT angiography and conventional CT angiography with bone elimination technique in cerebral vessel

Objective To evaluate the difference of reconstruction time and image quality of cerebral angiographic reconstruction between the subtraction CT angiography technique and conventional CT angiography.Methods 30 cases performing subtraction CT angiography and conventional CT angiography CT were retrospectively selected randomly.CT raw date were reconstructed with volume rendering and maximum intensity projection(MIP) techniques to display the vessels.The post processing time and the quality were compared.Results The image quality of the subtraction CT angiography was better than conventional CT and the average time of post-processing taken by the subtraction CT angiography was much shorter than that of conventional CTA.Conclusion Subtraction CT angiography together CPR can display both the artery wall and lumen,and make up the insufficiency of DSA.The image quality of subtraction CT angiography technique could be the first choice in cerebral vessel angiography.