Brain MRA Quick Reference Guide for Patients
"Time of flight" MR Angiography relies on flow related enhancement of arteries to achieve contrast. This does not require an IV contrast injection, but relies on an MR phenomenon of flow related enhancement to produce bright vessels. This technique is routinely used in the evaluation of the cerebral arteries.
Image from an MRA brain scan done at Guilford Radiology, 2010
Indications:
Identify and evaluate aneurysms, dizziness, stroke, and headache.
Contraindications
Patients with cardiac pacemakers, ICD, or neuro-stimulators may not be eligible for an MRI. Patients with pins, plates, screws and joint replacements, stents & filters can have an MRI as long as it has been 6 weeks since placement of the device. Women who are pregnant should avoid having an elective MRI. Women who are pregnant and need an MRI should be individually evaluated for risk vs. benefits and should avoid an MRI in the 1st trimester of pregnancy.
Patient Preparation
For the MR exam, if claustrophobia or anxiety is a problem, your referring physician may wish to prescribe a mild sedative to be given prior to the study. No other pre-visit preparation is necessary. You will need to remove all jewelry, hairclips, pony-tails and bobby pins. In addition, try to wear clothing free of metal. If any of yuor clothing contains metal, you will need to remove all clothing containing metal. This would include bras with metal enclosures and jeans with metal zippers and buttons. You will be provided a gown and a secure locker in which valuables can be placed.
CPT Codes
- 70544 Head Without Contrast
Patient Weight Limit
Our MRI equipment has a weight limit of 440 pounds.
Did your doctor order this exam?
General Information:
MR imaging uses a powerful magnetic field, radio frequency pulses and a computer to produce detailed pictures of organs, soft tissues, bone and virtually all other internal body structures. MRI does not use ionizing radiation (x-rays). Detailed MR images allow physicians to better evaluate various parts of the body and determine the presence of certain diseases that may not be assessed adequately with other imaging methods.
What Happens During the Test?
You will be asked to lie down on his back on the scanning table. The table will then slide into the scanning area. During the test, the MRI will make a rapid tapping noise. Your experience and comfort are of key importance. Therefore, you will be offered the chance to watch TV or offered earplugs or a music headset; in addition blankets are also available. You should relax and remain still during the exam. You should plan 45-90 minutes of total clinic time. The scan time can vary from 20-60 minutes depending on the study. You may resume normal activities following the MRI.
The Results
A radiologist will analyze the images and send a signed report to your referring provider within 1 business day.
Questions?
If you have any questions or concerns about your procedure, feel free to call us at 203-453-5123 or contact us online.
