Answer to Sample Question 2
Which of the following examinations is generally thought to produce the lowest radiation effective dose (E)?
- Coronary CT angiography with field of view focused on the heart, but without ECG dose modulation.
- Myocardial perfusion imaging utilizing a dual isotope protocol with 30 mCi Tc99m and 3mCi of Tl201.
- Myocardial perfusion imaging utilizing a two day protocol with Tc99m (30mCi for both injections).
- Diagnostic invasive coronary angiography via the femoral approach.