Different types of Cardiac CT Scans - What do they mean/do?

Does anyone know the difference between: a cardiac CT with contrast, a coronary CT angiogram and a chest CT angiogram with contrast?

I have a "CT Angiogram Chest" scheduled to monitor progress of an aortic aneurysm. My husband had one for the same reason and they injected some kind of dye? contrast? His report actually says "with and without IV contrast utilizing angiographic technique." I am wondering if I will get any useful information on progression of atherosclerosis from this scan. I looked at his report to see what was discussed, but he has zero calcium so it didn't talk much about level or distribution of atherosclerosis. I've had a coronary CT angiogram and it was very informative on atherosclerosis in the coronary arteries, but I'm thinking this will not be as detailed.

Thanks!