- Metallic implants.
- Foreign body in the eye.
- Pacemakers and insulin pumps.
- MR-incompatible prosthetic heart valves.
- Pregnancy (during first trimester).
MRI contrast contraindications
- Contrast allergy.
Severe renal impairment.
- Leave all jewelry and other accessories e.g. watches at home or remove them prior to the MRI scan.
- Leave metal and electronic items e.g. credit cards outside the MRI room.
If contrast material will be used; you need:
- Valid Creatinin test.
- Fasting for 4-6 hours.
You will be positioned on the moveable exam table. Straps and bolsters may be used to help you stay still and maintain your position.
Devices that contain coils capable of sending and receiving radio waves may be placed around or next to the area of the body being scanned.
MRI exams generally include multiple runs (sequences), some of which may last several minutes.
If a contrast material is used, a nurse will insert an intravenous catheter (IV line) into a vein in your hand or arm that will be used to inject the contrast material.
You will be placed into the magnet of the MRI unit. The technologist will perform the exam while working at a computer outside of the room.
If a contrast material is used during the exam, it will be injected into the intravenous line (IV) after an initial series of scans. More images will be taken during or following the injection.
When the exam is complete, you may be asked to wait while the radiologist checks the images in case more are needed.
Your IV line will be removed after the exam is over.
The entire examination is usually completed within one hour but may occasionally take longer.
Only if you are going to have contrast material injected;
– You are advised to drink plenty of fluid after the examination to help wash out the IV contrast from your body, except if you are on fluid restriction for renal or cardiac conditions; then review the matter with your physician.
– If you are a nursing mother; you might be advised to stop breastfeeding for 24 hours after the examination.