16-slice CT has a certain diagnostic effect on patients with a heart rate of 70 beats or less, but the accuracy of the judgment of coronary stenosis is limited. 64-slice CT has a very high negative predictive value (say you're fine and you're fine), a higher positive predictive value (say you're not fine and you're not fine), and the judgment of the degree of coronary artery stenosis is also much more accurate, with a heart rate of 110 beats or less, and some brands of CT require a heart rate below 80 beats, but require heart rate flushing. The heart rate is required to be below 110 beats, with some brands of CT requiring 80 beats or less, but the heart rate is required to be flush. Therefore, 64-row CT is significantly better than 16-row CT.
Also, those who can't hear and can't hold their breath for more than 10 seconds basically can't do the test.
The cost varies from hospital to hospital, ranging from about 1500-2000.