It would be torture for me if I didn't have evidence I was reducing the deadly plaque with my actions.
The additional radiation is troublesome but I would want to get the test as soon as possible so I had a baseline of the artery walls as close as possible to the time of the heart attack.
To add to Rich's comments, the only direct evidence would be a post-mortem. You could spend big bucks on a boutique spa physical, but would those guys have any credibility?Many believe that technologic advances will overcome many of these imperfections but at an exposure comparable to perhaps 20 chest x-rays every time, the risks are there, too.
Speaking from the perspective of 311 mrem of lifetime documented exposure to ionizing radiation, I thought I knew all about radiation and its hazards. I knew that most of the physiology was based on Hiroshima & Nagasaki as well as various American accidents over the years, but i was still very taken aback in the 1990s when the radiation medical experts said "Uh, this is all about three times more dangerous than we previously believed."
The rules of the game can change without warning. You don't want to absorb the rads just to see if you can find some plaque.