Cardiac CT: Sensitivity and Specificity
Sensitivity is for >75% stenosis, but specificity is for >50% stenosis (!).
There is a lot of controversy surrounding this technique, especially as in imparts a great amount of radiation and is diagnostically limited in patients with significant coronary artery calcification. I believe this study is representative, but see UpToDate for more.
80% sensitive, 97% specific
97.2% sensitive, 87.4% specific