Search the Health Library
Get the facts on diseases, conditions, tests and procedures.
I Want To...
I Want To...
Find Research Faculty
Enter the last name, specialty or keyword for your search below.
School of Medicine
I Want to...
Radiology Exam: Magnetic Resonance Imaging (MRI)
MRI is a diagnostic medical imaging test that produces detailed images of almost every internal structure in the human body, including organs, bones, muscles and blood vessels.
MRI scanners create images of the body using a large magnet, radio waves and a computer. There is no radiation produced during an MRI exam.
MRI: What You Need to Know
- Because an MRI scan produces a strong magnetic environment, it is very important that you tell your doctor about any metal or implantable device anywhere within your body including a pacemaker, insulin pump or metal pins.
- Your doctor may order an MRI exam with contrast. A contrast agent is a liquid inserted through an IV line to help certain areas of the body show up clearer on the images.
- The MRI scanner makes a very loud noise during certain parts of the exam. You will receive earplugs or headphones to make you more comfortable during the scan.
- Similar exams are magnetic resonance angiography to view blood vessels and a functional MRI to determine the location of specific brain functions.
MRI Exams at Johns Hopkins Radiology
Please review the letter confirming your appointment for specific instructions for the following MRI examinations. In some cases, you will be contacted prior to the examination to discuss the details of the procedure and how to prepare.
- Breast MRI scan
- Breast biopsy by MRI
- Cardiac MRI scans
- Dynamic pelvis/defecagraphy by MRI
- Enterography by MRI
- FerriScan imaging
- Fetal MRI exams
- Functional MRI scan
- Magnetic resonance angiography
- Musculoskeletal MRI exams
- Neurological MRI exams
- Pediatric MRI exams
- Prostate imaging by MRI
MRI Safety at Johns Hopkins radiology
MRI scans use a very strong magnetic field that can be hazardous to patients with certain metallic implants. To ensure your safety, we will need to ask some specific questions to prevent any harm to you. If you have experienced anxiety in the past from being in close places, please contact your ordering physician for any type of antianxiety medication you may need prior to your MRI exam.
Pacemaker and ICDs
Patients who have pacemakers or implantable cardioverter defibrillators (ICDs) can now safely have various types of MRI exams performed at The John Hopkins Hospital. We have state-of-the-art MRI scanners and cardiology staff members who are present and monitor throughout the exam with experienced MRI technologists.
Why Choose Johns Hopkins Radiology for MRI?
Our diagnostic radiologists have subspecialty training in interpreting MRI images of all areas of the body. Our state-of-the-art equipment and technology are combined with providing the highest level of patient care.
MRI scans may be done on an outpatient basis or as part of a hospital stay. MRI exams are offered at all of our locations. To schedule an exam, call 443-997-7237.
A Child's MRI without Anesthesia
Is your child about to have an MRI exam? Kids can learn from Fin the Fish everything they need to know about coming to Johns Hopkins for an MRI. Learn more about Johns Hopkins Pediatric Radiology or schedule an exam 443-997-7237.
Request an Appointment
Already a Patient?
Traveling for Care?
Whether you're crossing the country or the globe, we make it easy to access world-class care at Johns Hopkins.