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Open MRI
Open MRI Is an Alternative for Very Large and Claustrophobic Patients
Open MRI technology works in the same way as conventional MRI, however, open MRI machines have lower magnetic field strength and are designed to accommodate patients, who might be unable to have a conventional MRI examination. Patients who are very large, severely anxious, claustrophobic or in need of constant support during an exam may be well suited for open MR imaging.
Most patients find examination in an open magnet quite comfortable. The Hitachi Airis II Opensided MRI System at Union Avenue Open MRI measures 3.5 feet (side to side opening), 17 inches (top to bottom opening). The scanning table is height adjustable. The magnet is open on the front back and sides. This design minimizes claustrophobic effect and allows patients to be accompanied by a supportive partner.
Due to lower magnetic field strength, all open magnets will result in longer scan times and in images with overall lower resolution than those obtained from conventional (high field) MRI units. Depending on the body part to be studied, the length of open MRI exams may prevent patients with severe pain or physical limitations from completing the exam. Open MRI examinations require patients to lie still for 5 to 15 minute sequences. Total exam time is usually 1 to 1 1/2 hours.
Certain conditions can prevent any MRI examination. Patients with a cardiac pacemaker or aneurysm clips in the head cannot safely have a MRI exam. Patients with severe pain or physical limitations may not be able to complete a MRI exam, which always requires the patient to lie still. For safety reasons, all patients are carefully screened before being placed inside the magnet. CT or nuclear medicine may provide alternatives for examination in some circumstances.
What to Expect During an Open MRI Exam
- Like all MRI scans, open MRI examinations are painless. All MRI exams involve strong magnetic fields. For your safety, each MRI appointment requires completion of a screening form to identify any condition you may have that could rule out a MRI examination.
- Before your scan, a MRI technologist will review your medical/allergy history and answer any questions you may have. He/she will keep you informed and support you throughout the study and be there to help you out of the scanner when the examination is complete.
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Some MRI examinations require an intravenous (IV) contrast injection (during the exam) to enhance the results of your study. This injection, performed by a nurse or technologist, is placed in a vein in your hand or arm. Contrast reactions / allergies (information on which can be found under Safety).to the contrast agent, Gadolinium, are rare.
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You may be asked to change into a gown before your examination to avoid possible magnetic interference from buckles, snaps, zippers, earrings or silk screening.
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Your MRI scan will take place in a specially designed room. You will be helped to lie down on a padded table. Most patients find examination in an open magnet quite comfortable. The Hitachi Airis Open MRI System at Union Avenue Open MRI (see Tacoma Locations) measures 3.5 feet (side to side opening), 17 inches (top to bottom opening). The scanning table is height adjustable. The magnet is open on the front back and sides. This design minimizes claustrophobic effect and allows patients to be accompanied by a supportive partner.
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Due to lower magnetic field strength, open MRI examinations take longer than conventional MRI scans. Patients should expect to lie still for 5 to 15 minutes sequences. Expect the total exam to take an hour to an hour and a half to complete.
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Your open MRI scan may require that a coil apparatus be placed around the part of your body that your physician is concerned about. This coil enhances visualization of the body part to be scanned.
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While the machine is in operation, it is normal to hear intermittent humming and thumping sounds. An intercom system in the room will enable you to communicate with the technologist during your scan. All rooms are air-conditioned and listening to music is optional in most of our locations.
How to prepare for MRI exams for adults and children
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