Multiple images of the heart will be acquired, with millisecond slices, using ECG gating. A relatively small bolus of iodinated contrast is used. Due to the state of the art 128 slice dual energy CT, radiation doses delivered to the patients are kept to a minimum ( <1 millisievert CT coronary angiograms are possible at our centre).
A radiologist will interpret these images to determine the degree, or absence, of narrowing of the arteries. The radiologist will also ascertain the amount of calcified plaque present in the arteries (coronary calcium score). The negative predictive value of this scan is over 99%. .