Black-blood MRI (BB-MRI) has been used to evaluate the walls of intracranial aneurysms at both 3T and 7T. However, there is no quantitative comparison between the two field strengths in terms of delineation quality of aneurysmal wall by using BB-MRI. In this study, we analyzed black-blood images acquired from the same group of patients at both 7T and 3T. Higher wall-to-lumen signal ratio (WLSR) and lower inside wall thickness (IWT) were obtained from 7T black-blood images. Our results suggest that 7T BB-MRI can provide improved visualization and measurement of intracranial aneurysmal walls.