A method of reducing blood flow within an aneurysm includes: injecting a contrast agent into a blood vessel including an aneurysm； deploying an occlusion device across the aneurysm； producing an image of the aneurysm including the contrast agent； and withdrawing the delivery device from the vessel after observing that the aneurysm has been stagnated by a desired amount. The image may be two-dimensional or three-dimensional. Observing that the aneurysm has been stagnated may include determining a degree of stagnation, for example by comparing an area or volume of the contrast agent in a first image and a second image. The desired amount may be a certain degree of stagnation, identification of a shape indicative of stasis such as a flat surface, an approximate hemisphere, a mushroom, or a crescent. If the occlusion device does not achieve the desired amount, a second occluding device may be deployed.
