From my reading and research, small bleeding in the brain is best imaged at about 3 days post injury. Earlier and the area might be still too small or have live blood. Later and it will have started to be absorbed by the body. They want to see it as the blood has begun to deteriorate and shows up differently.

The CT with contrast is a good imaging system other than an MRI/MRA.

Hope this helps.

My best to you.