What is MRI?

Magnetic Resonance Imaging (MRI) or Nuclear Magnetic Resonance (NMR) is an imaging modality that utilizes magnetic fields and radiofrequency to obtain detailed pictures of the body. Powerful magnets and radio waves are used to construct images of the body, the magnet generates a magnetic field roughly 10,000 times stronger than the natural background magnetism from the earth. A very small percentage of hydrogen atoms within a human body will align with this field. When focused radio wave pulses are broadcast towards the aligned hydrogen atoms in tissues of interest, they will return a signal. The subtle differences in that signal from various body tissues enables MRI to differentiate organs, and potentially contrast benign and malignant tissue. Any imaging plane (or "slice") can be projected, stored in a computer, or printed on film. MRI can easily be performed through clothing and bones. For some MRI procedures contrast media, commonly referred to as "dye", is sometimes given intravenously during certain scans to provide the physicians with additional information.

Who will perform the examination?

Our certified MRI technologist will prepare your MRI Images for the radiologist to evaluate.

Why do I need a MRI?

An MRI can provide additional imaging information for the clinician based upon its superior tissue contrast resolution. Combined with other imaging methods, a more definitive diagnosis can be given in the work up of a patient's disease. Sequences performed with intravenous contrast may provide additional data about the blood vessels within masses. An MRA, or magnetic resonance angiogram, is a special type of MR that creates three-dimensional reconstructions of vessels containing flowing blood and is often utilized when conventional angiography cannot be performed due to renal failure or other contraindications.

How do I prepare for a MRI?

No preparatory tests, diets, or medications are usually needed, we do recommend that you do not eat in the 2 hours prior to your exam. If you are having an MRI of the abdomen or pelvis, please do not eat or drink for 4 hours prior to your exam (except medication with a small amount of water). An MRI can be performed immediately after other imaging studies. Depending on the area of interest, the patient may be asked to fast for 4 to 6 hours prior to the scan. If you are scheduled for an MRCP, you will be asked to have nothing to eat or drink (even water!) for 6 hours prior to the exam. Take all of your usual medications.

Next>> Part 2 - How is the procedure done?