Virtual Medical Centre

3D Magnetic Resonance Imaging (3D MRI)

• What is MRI
• Indications
• Preparation

What is MRI

MRI (magnetic resonance imaging) is a diagnostic technique used to create images of the body like a CT scan. It is non-invasive (It does not enter the body cavity) and requires no radiation, instead it is based on the magnetic fields of the hydrogen atoms in the body. By scanning the body, MRI is able to provide computer-generated images of the body's internal tissues and organs. MRI usually scans the body in an axial plane (ie. cutting the body into slices from front to back). Usually the images are 2-dimensional, where the MRI images are usually presented in slices from top to bottom. However, using sophisticated computer calculation, these 2-dimensional slices can be joined together to produce a 3-dimensional model of the area of interest being scanned. This is called 3D MRI.  

Indications

MRI is used in a wide variety of situations, including the investigation of:

• nerve conditions (including the brain)
• heart and vessel function
• diseases of the liver and bile ducts
• chest imaging
• orthopaedic conditions, such as shoulder injury, hip injury.

3D MRI can provide clearer information for certain conditions, such as hepatobiliary pathology, cardiovascular pathology and even orthopaedic injury. Sometimes 3D reconstruction of the nervous system (particularly the brain) is done.

Preparation

In most cases, there is no special preparation for an MRI scan. The patient can eat or drink normally on the day of the scan. However because going into the machine can be a new experience for the patient, it is best to avoid food or beverages that can cause anxiety, such as large amounts of coffee. Before the scan, the radiographer will make sure there are no metallic items (either worn or inside the patient) to be brought into the scan room. Items such as keys, credit cards, phone cards, coins, watches, and other metal or magnetic related items will be removed because all these are dangerous due to the strong magnet of the MRI machine. Also, other important implants that contain metals (such as heart valve replacement implant, pacemaker, etc) will not be allowed for an MRI scan.