1) Due to the powerful magnets, any metal objects left in the room can be pulled towards the magnet and can harm patients. Examples have included oxygen cylinders and chairs. 2) Pacemakers were absolute contraindications to MRI scans. However, modern pacemakers and implantable defi brillators are being designed to be ‘MRI safe.’ 3) MRI scans can be combined with PET scans. These PET-MRI scans produce anatomical and functional images, such as assessing for extent of tumour growth and tumour activity. 4) The coils of the superconducting magnets are cooled to lower their resistance. Liquid helium cools them to near absolute zero – around -270˚C. 5) Mobile MRI scanners can go to where the patients are. They are based in big articulated lorries and can be stationed outside hospitals to provide extra scanning capacity.
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