Patent ID: 6462543
Filing Date: 2002-10-08
Classification: G01R

Abstract:
A method for performing verification measurement and correction of magnetic field in a magnetic structure of a Nuclear Magnetic Resonance imaging machine, the method comprising:providing a test member having such characteristics as to generate a theoretical image using Nuclear Magnetic Resonance imaging; obtaining a Nuclear Magnetic Resonance image from said test member; comparing the theoretical image with the obtained image; determining differences between the obtained image and the theoretical image; computing correction parameters and corresponding positions of said correction parameters on the magnetic structure based on the determined differences; choosing a mathematical theoretical function describing the magnetic field; and selecting a test member so that the test member has a structure suited to the mathematical theoretical function describing the field and which test member produces one or more selected images, each of these selected images being correlated to one or to a limited number of selected low order coefficients of the mathematical theoretical function describing the magnetic field such that the differences between the theoretical image of the test member and the obtained image of the test member depend only on the one or the limited number of selected coefficients of the mathematical theoretical function describing the magnetic field.