MRA - Brain is done without contrast (gadolinium). Because no contrast is given, it is a good alternative to CT angiography for patients that can't tolerate CT contrast (iodinated contrast.)

Is MRA an MRI with contrast?

An MRA test is similar to an MRI. As such, during the MRA, you'll need to lie as still as possible so the technologist can obtain the best quality images for the radiologist. MRA scans can be performed with a contrast material or without.

When is contrast needed for MRA?

MRA may require an injection of contrast into a vein in your arm. The radiologist or technologist may ask if you have asthma or allergies to certain drugs, foods or the environment. Doctors may use gadolinium-based contrast material for MRI exams.