Services - MRI Imaging Center FAQ

A common diagnostic tool used in the care of Orthopaedic Insuries is the MRI, which is used to assist the treating physician to diagnose different conditions and disorders of the bone, joint, muscle and spine. Organs, tumors and other pathology can also be identified. Listed below are some of the most common questions we receive from patients and referral sources related to MRI's.

What is MRI?

MRI stands for Magnetic Resonance Imaging. It uses a large magnet and radiofrequency waves to produce cross sectional images of the body. There is no radiation (x-rays) involved. This test is a painless procedure that takes 30 to 60 minutes, depending upon the type of exam ordered.

Can anyone have a MRI?

NO. Patients with pacemakers cannot have an MRI. Certain aneurysm clips, hearing implants, heart valves and neurostimulators may not be scanned. This is why a complete surgical history is taken before any MRI scan is performed.

Does this mean those patients with hip and knee replacements (for example) cannot be done?

NO. People with joint replacements, screws, cages, heart bypasses and certain heart valves can have an MRI scan.

How do patients prepare for an MRI exam?

For the majority of MRI procedures, there is no preparation at all. Patients may eat and drink up until the time of the exam. The exception would be for MRI’s of the abdomen, liver or for breastfeeding mothers.

Are all MRI scanners the same?

No. MRI scanners are measured in field strength (Telsa). which vary greatly. The higher the telsa the higher the image quality. You may have heard the phrase open or closed when referring to MRI scanners, however "closed" scanners are open on both ends, with the "open" scanners open on three sides. Typically, closed scanners are a higher field strength, thus better image quality. Depending on the manufacturer, weight limits of the scanner may vary from 300-420 lbs.

What type of of scanner does DMOS use?

Our MRI Magnet; the Toshiba Titan 1.5 T magnet, provides outstanding image quality; key to providing your treating physician with clear and accurate imaging to support a more accurate diagnosis and treatment plan! The system offers reduced acoustic noise and a larger and shorter bore (opening) to enhance patient comfort. The open –bore design (largest in the market today) gives the patient a feeling of openness, and the technology quiets the MRI environment; reducing the traditional jackhammer noise. Instead the patient hears a quieter sequence as the scanner acquires the images. Claustrophobic and large patients benefit from the largest MRI bore (or opening) at 71 cm. Many scans can also be performed “feet first”. This allows for greater patient comfort and minimizing feelings of anxiety.

What is the significance of ACR accreditation?

The ACR (American College of Radiology) is a voluntary accreditation program that was established to attest to the quality of the performance of MRI images and equipment. This certification ensures to the patients and physicians that only certified or well-trained competent staff using properly functioning MRI equipment perform MRI’s. Quality control is done daily on the equipment before any patients are scanned to ensure the highest quality of scans.

Is Claustrophobia a concern?

For most patients this is not a concern. If there is a patient who suffers from claustrophobia or anxiety we have many benefits at DMOS to help you overcome the fear and anxiety. We have headphones that allow you to listen to your favorite radio station or CD. Our room is a large, well-lit room with many windows, and our scanner has a large bore/opening (71 cm); all of which help alleviate that cramped “closed in” feeling. We can supply you with a cool compress for your forehead and eyes. If necessary an individual can sit with you during your scan for added comfort.

Patients are welcome to visit the MRI Imaging Center at DMOS to view the scanner and room prior to scheduling an appointment to help improve your comfort level.

Some patients may require oral sedation (DMOS does not offer I.V. Sedation). If you feel you may require oral sedation a prescription may be supplied to you by your treating physician. The prescription should be taken prior to coming to DMOS for your MRI appointment. Please follow the instructions carefully to know when to take the prescription. Patients that use “oral sedation” will require a driver to bring you to DMOS and take you home.

Any precautions that need to be taken for MRIs?

Some precautionary measures must be taken due to the high magnetic field. The MRI technology in use today produces no known hazards to properly screened patients. For this reason, all patients are required to fill out a complete history sheet. Certain patients can never have an MRI scan. These include patients with cardiac pacemakers, neurostimulators, ferromagnatice intracranial aneurysm clips, and cochlear implants.

If you have ear implants, metal implants, metal in your eyes or metal anywhere in your body from previous accidents or surgeries please report that to the MRI techs prior to you MRI scan. This does not necessarily mean you cannot have an MRI scan; we need to confirm that your implant is MRI compatible or evaluate the location of the metal to assure that it is safe for you to have an MRI.

Can pregnant women have a MRI scan?

Yes, if the benefits outweigh the risks. Many facilities do not scan pregnant patients at all in the first trimester and some not at all. As far as we know, to date, there are no known risks involved with MRI but the long-term effects are not known. A concern is that the MRI Scanners can increase internal body temperature (known as SAR). For the benefit of the fetus it is recommended to identify the necessity of the test before taking any risk. The decision whether to perform an MRI should be seriously discussed with the expectant mother and the treating physician(s). The facility performing the MRI will use a “fetal monitor” to monitor the fetus during an MRI. DMOS does not provide “fetal monitoring”. Patients that are pregnant should notify their physician prior to scheduling an MRI procedure.

Is Contrast Used for MRI?

Yes, contrast can be used for MRI exams, but many people confuse it with contrast that is used for radiography examinations such as angiograms, CT’s and IVP’s. The most common contrast that is used for MRI’s is called gadolinium DTPA. It is used for MRI exams only and doesn’t have the adverse effects of x-ray contrast.

Contrast for MRI’s is used for patients that have had previous back surgeries, metastatic disease or other abnormalities. There are other contrasts that are used for MRI, but are not as common. One (an IV solution) is used to show up abnormalities of the liver, and there is another that is used orally to differentiate bowel in the abdomen and pelvis.

Patients that require the use of contrast will need a current Creatinine level (obtained within 6 weeks of the MRI study) if any of the following apply:

You may have other questions about MRI that we have not answered. If so, please contact the MRI Imaging Center at DMOS at 515-224-5111. We are more than happy to help!