MRI (Magnetic Resonance Imaging) is ordered by your physician to evaluate internal body structures without having to use X-ray or surgery. MRI uses the physical properties of magnetic fields, radio waves, and computers to generate images of soft tissues within the body. MRI is a non-invasive procedure and there are no known side or after effects.
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Patients are asked to lie on a table and remain still for approximately 30 minutes to one hour depending on the test ordered. During the examination, a faint knocking sound will be heard, which is normal and is the operation of the imaging process. The images are formed from signals emitted by tissue in the body. The MRI process captures different tissue characteristics and translates them into different contrast levels on the image.
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MRA -----Brain/neck, Circle of Willis, Carotids, Vertebrals, Intra/extracranial vessels, renal arteries/Abdomen, MRV

CatScan (CT) Spiral CT, 3D Reconstruction, CT angiography/aorta, circle of willis, Carotids.
Computed Tomography is a diagnostic imaging procedure that combines the use of x-rays with computer technology to produce cross-sectional images (“slices”) of the body. The images produced by this scan are more detailed than those of an ordinary x-ray (or radiograph). 

Ultrasound----Vascular  General, obstetrical, vascular.
Ultrasound (US) imaging, also called ultrasound scanning or sonography, is a method of obtaining images from inside the human body through the use of high frequency sound waves. The reflected soundwave echoes are recorded and displayed as a real-time visual image. No ionizing radiation (x-ray) is involved in ultrasound imaging. Obstetric ultrasound refers to the specialized use of sound waves to visualize and thus determine the condition of a pregnant woman and her embryo or fetus.