MEDRADSC 2Z03 Study Guide - Midterm Guide: Pituitary Gland, Congenital Disorder, Cranial Nerves
29 Jun 2016
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The flip angle is determined by the duration of the rf pulse and its power. The function of the rf pulse in mri is to magnetize the protons. The immediate action of the rf pulse is to cause the protons to precess in phase. An rf pulse stands for radio frequency pulse, which is a form of an electromagnetic wave. A 180 pulse has 10 times the power of a 90 pulse. A partial flip has an agle between 0 and 90 . Because water has an odd number of neutrons. Because water protons are the most abundant spins in the body. If a sample is placed in an applied magnetic field, the net magnetic moment of the sample will: Be zero, due to the large number of spins and random. Align along the direction of the applied magnetic field. The number of spins existing in the two different energy levels, at any one time, is determined by:
