What is MRI?
MRI (magnetic resonance imaging) uses a computer sysytem, radio waves and a strong magnetic field to produce detailed images of internal organs and soft tissue structures. MRI is an imaging option for a broad range of conditions, including detection of neoplasia, cardiovascular, neurological and musculoskeletal diseases.

What are some common indications for MRI?
Because MRI can give such clear images of soft-tissue structures near and around bones, it is the most sensitive exam for spinal and joint problems.

Before the MRI patients may wish to apply for prior consent ffrom their insurer if they have private medical insurance or from their ACC case Manager for ACC funded examinations.. We are able to give the patient a quote for the examination once we have the seen the clinical indications on your referral.

Because the strong magnetic field used in MRI will affect any ferrous metallic object implanted in the body, MRI staff will ask the patient to answer a questionnaire designed to screen for metallic implants. These include artificial joints, heart pacemaker (or artificial heart valve), implanted device (eg Intrauterine device or IUD), cochlear implant, or any orthopaedic metal plate.

In most cases, surgical staples, plates, pins and screws pose no risk during MRI if they have been in place for more than 4-6 weeks. Tattoos and permanent eyeliner may result in local skin heating. Patients will be asked if there is a possibility of a bullet or shrapnel or if they have worked with ferrous metal (possibility of metal fragments particularly in the eyes). If there is any question of metal fragments, the patient will be referred for an xray prior to the MRI. Tooth fillings and dental braces are usually not affected by the magnetic field, but discuss the braces with the Radiologist if the patient is having a head or neck MRI.

Patients will be asked to remove hair clips, jewellery, glasses, hearing aids, and any removable dental plates. The Radiologist or MRI radiographer may ask about allergies to drugs or foods.

If your patient could be pregnant please let us know.

If your patient is unable to lie flat, lie still or may be claustrophobic please let us know prior to the MRI appointment.

The MRI scan

Some patients may wish to take a support person into the MRI scan. If this person wishes to go into the MRI room they will be required to complete the safety questionaire also.

The movement of the magnetic coils in the MRI make a loud noise while scanning. Patients are given headphones to minimise any discomfort from this.

The image sequences are usually between 3 and 6 minutes and most examinations will require between 4 and 8 sequences to complete the examination. The total examination time ranges from 30-60 minutes.

Gadolinium is used as a contrast medium for some MRI examinations. This will be administered intravenously. Contraindications to intravenous administration include advanced renal failure and prior anaphyllactic reaction to intravenous gadolinium.

MRI series are available to you on readable DVDs. If you wish to receive a copy please let our staff know.