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How long does it take?
The length of time in the machine is usually about 20-60 minutes, depending on the part of the body being imaged. Plan to be at the imaging center for approximately one hour.
Does it hurt?
The MRI procedure itself does not hurt. Certain contrast-enhanced studies may require a needle stick and injection.
Can anyone have an MRI?
No. An MRI may not be performed if you have metal in your body or other types of devices. The staff will discuss this with you at the time of your visit. |
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Is there any reaction to the contrast?
Reaction to the contrast is rare, although there have been a few instances where the contrast has caused nausea or vomiting.
When will my doctor get the results?
Results are usually received within 3 to 5 working days.
Is there a maximum weight limit?
There is a weight limit on the table. You may be asked your weight when scheduling your appointment.
What is an MRI?
MRI is an abbreviation for Magnetic Resonance Imaging. It is modern technology that uses a magnetic field and radio waves to produce views of the inner functions of the body. No x-radiation is used (MRI is not an x-ray).While x-rays are best for showing bones, an MRI is used to examine soft tissue, such as organs, muscle, cartilage, ligaments, and tendons in many parts of the body. MRI may also be ordered to study bones.
Why should I know about an MRI?
MRI is a dynamic way for doctors to diagnose certain conditions and diseases that several years ago might only have been detectable from physical signs and symptoms. MRI provides doctors with information to determine the most appropriate treatment.
Is MRI Scanning safe?
MRI is extremely safe. Unlike x-rays and some other imaging technologies, an MRI doesn't use ionizing radiation.
How does it work?
Your body is composed of tiny particles called atoms. Under normal conditions, the protons inside of these atoms spin randomly.
- Magnet
creates a strong, steady magnetic field. This causes the protons to line up together and spin in the same direction.
- Radio Frequency (RF) Signal
is beamed into the magnetic field. The RF signal makes the protons move out of alignment. When the signal stops, the protons move back to their aligned position and release energy.
- Receiver Coil
measures the energy released by the disturbed protons. The time it takes the protons to return to their aligned position is also measured. These measurements provide information about the type and condition of tissue in which the protons lie.
- Computer
uses this information to construct an image on a TV screen showing the distribution of protons of certain atoms (usually hydrogen). What can MRI evaluate?
MRI can evaluate brain, bone, organ and some soft tissue structures.
During pregnancy
MRI scans are generally not recommended for pregnant women. Sometimes late in pregnancy, doctors will request an MRI to be performed.
What can I expect from an exam?
The following are explanations of a typical exam. Exams may differ based on the individual patient.
Remove personal possessions such as your watch, wallet, jewelry, and car keys. Even credit cards must be secured, as the scanner will erase the information on them. The technologist will put your belongings in a lock box. You may be asked to change into a patient gown, depending on the type of exam ordered.
- Examining Table
You will lie down on an examining table, a technologist will help position you within a coil. This coil allows the technologist and doctor to view the body part being imaged.
- Contrast medium
may be administered about 3/4 through the exam to highlight a particular part of your body. Contrast medium outlines less dense, hollow vessels and organs allowing them to become more apparent.
- Movement
The table gently glides you into the magnet, which is an air-conditioned tunnel. The technologist will be in an adjacent room, but will have you in full view at all times and be in constant communication via two-way microphones. The small size of the tunnel may cause some patients mild anxiety, however most patients are able to go through the procedure without difficulty. If you suffer from claustrophobia, your doctor may order a mild sedative. This is to be taken before your test. An Open MRI unit and the short-bore flared, open design MRI are also available and may be ordered by your physician.
- Scan
You will hear humming and occasional thumping sounds as the images are being produced. You may also feel some vibration.
- After the exam
If more information is needed after the technologist or radiologist examines the results, you will be notified and more scans may be taken. The radiologist will provide your physician with an interpretation of the results and your physician can explain what the findings mean for you in terms of health, treatment, and other questions that you may have.
How should I prepare?
There's no special preparation necessary before having an MRI. Follow your normal routine, eat normally and take any medication you regularly take. You will be asked several screening questions when making your appointment. You will also have paperwork to fill out when you arrive. If you have metal in your eyes or aneurysm clips (some clips may be OK) an MRI cannot be done.
For more information, please click preparations. |
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