What to expect from the test..angio CT

Inadvertent discovery of TAA 3 years ago, via calcium scoring CT

4.1 cm at that time

After 1 year no change.

My primary doctor has decided to follow up this year with a angio CT w contrast.

Can anyone basically describe the procedure for me? Duration, body position, discomfort? ( The scheduling staff could only give me limited information)

65 yo F, moderately active. Calcium score zero :) No other problems except osteo changes.

TIA