CTA and MRI are two completely different imaging methods, and their differences are probably as follows: 1. The imaging principles of the two are different. CTA is arteriography under CT, by injecting contrast for patients intravenously, and then doing three-dimensional reconstruction of blood vessels to observe whether the arteries have plaque, stenosis or malformation. MRI uses an applied magnetic field to examine the blood vessels of the human body, and there are two types of examinations, including cerebral angiography under MRI, which does not use contrast, and cerebral angiography under MRI, which also requires intravenous injection of contrast to visualize the blood vessels. 2. The effects of CTA on the body are different, as CTA uses radiation, so there is radiation to the human body, while MRI uses an applied magnetic field, so there is no radiation to the human body, which is relatively safe.
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