aneurysm testing

I have a decently strong history of aneurysms.  I've had ct scans with contrast and head/neck x-rays.   They have all come back normal.  I was wondering if anyone knew what is the best test for screening for aneurysms, CT scans with contrast or MRI's?  
Thanks

[sarahin]

I also have annies.I talk with many people on line with them. Most people have MRAs. They are MRIs with contrast. Before any clipping or coiling they will order an angiogram to better map out the position of the annie. The angiogram is where they run a cathether up your femeral artery and inject dye into each side of your brain. You can see everything on the screens in front of you. They don't knock you out, but do give you sediation. Not the best way to spend the day, but kind of cool.