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== CT angiography ==
== CT angiography ==
CT angiography (CTA) refers to using a [[CT]] scan and [[iodine contrast]] to visualise blood vessels. CT angiography is widely used and possibly the most frequently used angiographic technique.
CT angiography (CTA) refers to using a [[CT]] scan and [[iodine contrast]] to visualise arteries. CT angiography is widely used and possibly the most frequently used angiographic technique.


=== Indications ===
=== Indications ===
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== MR angiography ==
== MR angiography ==
MR angiography (MRA) refers to using an [[MR]] scan to visualise blood vessels. This can be achieved with [[gadolinium]] contrast, or without, due to some modern MR techniques. The earliest MR technique to allow for non-contrast angiography was time of flight (TOF), but nowadays many other techniques exist as well.  
MR angiography (MRA) refers to using an [[MR]] scan to visualise arteries. This can be achieved with [[gadolinium]] contrast, or without, due to some modern MR techniques. The earliest MR technique to allow for non-contrast angiography was time of flight (TOF), but nowadays many other techniques exist as well.  


MR angiography is usually used instead of CT angiography when it's important to avoid ionising radiation or iodinated contrast material, for example in case of pregnancy and children.
MR angiography is usually used instead of CT angiography when it's important to avoid ionising radiation or iodinated contrast material, for example in case of pregnancy and children.