ABSTRACT
This chapter discusses the principles behind magnetic resonance imaging (MRI), presents the problems associated with anaesthesia in the scanning department. It explains how items are to be used within an MRI scanner classified. Computed tomography (CT) take a series of X-ray images around a central axis, either in a discontinuous ‘shoot and step’ process, or in a continuous ‘spiral’ manner. The latter are much quicker and so may reduce motion artefact, and enable better 3D reconstruction of images. Within the magnetic field, ferrous implants are prone to displacement or torque forces, which can lead to serious patient injury. Items are completely free of all metallic components. They are non-metallic, non-conductive and non-radiofrequency reactive. They pose no hazard in any MR environment. Items are safe under certain tested magnetic conditions, which should be enumerated on the product. Items pose a hazard in any MR environment.
