Computed tomography (CT) provides excellent spatial resolution and has a rapid acquisition time. It is good for imaging arteries and veins. CT is superior to cardiac magnetic resonance (CMR) imaging for visualising the epicardial coronary arteries, their collaterals and arteriovenous (AV) malformations. CT can also be used to assess the size of the ventricles and their function, but has an inferior temporal resolution compared to cardiac magnetic resonance imaging. As it is well known, the major drawback of computed tomography is the radiation risk, which cannot be avoided. Contrast related issues like the small but real potential for contrast nephropathy, allergic reactions, transient myocardial suppression and thrombotic possibility in a dehydrated polycythemic patient should also be given due consideration.
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