MEDRADSC 3DE3 Lecture Notes - Lecture 11: Free Induction Decay, Spin Echo, Spin–Lattice Relaxation
20 Aug 2020
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Document Summary
Some patients may be unconscious, confused, or awkward. If unable to achieve answer, you need to postpone study until further evidence can be acquired. May come from patient notes, other recent medical imaging, the family, referring physician. Mri safe: pose no known hazards in all mri environments. Mri conditional: no known hazards when specified conditions are met. When there is a threat, the magnet should be quenched using a quench button. Made clear to all zone 3 & 4 personnel. Removing saturation pulses, increasing tr, decrease slice #, use an appropriate receive coil, avoid trains of 180 rf pulses, Induce currents in body tissues leading to nerve stimulations. Induce currents in devices (ie external fixators) causing unpleasant vibrations when interaction with main magnet. Liquid he creates one of the coldest environment in the universe (-269 degrees c) May be a local protocol - most dangerous is when liquid/gaseous he is being vented into the room (asphyxiate quickly)
