A CT angiogram (CTA) with contrast provides detailed visualization of arteries, including soft plaque and luminal narrowing, and involves a radiation dose of approximately 2 millisieverts when performed well.

“the ctn geogram is a much better test but of course it comes at a higher cost and it comes with more radiation though these days if done really well at really good places it should be in the ballpark of two millisieverts of radiation which is a very small dose of radiation that's about four percent of your annual allotted radiation according to the nrc so that scan is a ct scan of the heart but now with contrast and this captures the calcification because they typically run a dry scan first to look for calcium but then once the contrast is in you now can see with great illumination the arteries and you get a better sense of not just luminal narrowing but also the presence of soft plaque because of the resolution of the scanner if it's done really well”