Patent ID: 7372270
Filing Date: 2008-05-13
Classification: G01R

Abstract:
1. A method of compensating for non-uniformity of excitation field B1+ in magnetic resonance imaging (MRI), the method comprising: measuring a variation in the excitation field B1+ over a region of interest (ROI) in an object, wherein the B1+ field causes nuclear spins in the object to rotate by a flip angle when B1+ is applied to the object; designing a flip angle profile {circumflex over (f)}(r) to be proportional to a reciprocal of the measured variation in the excitation field B1; and adjusting one or more control parameters of the flip angle profile {circumflex over (f)}(r) in accordance with the measured variation in B1+, so as to cancel out variation in actual flip angle until a profile of the actual flip angle is achieved that is substantially uniform throughout the ROI.