The Method of Correction the B1 Errors in MagnetizationTransfer Ratio MTR

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angličtina

The meaning of MRI is based on the concept of the magnetic sum vectors, Mz and Mxy, which related with resonant frequency RF, where the physics idea in MRI is influencedby the external magnetic field B0 on the nuclear magnetic moment vector of proton in hydrogen,but the radio-frequency RF field B1 errors is based on magnetization transfer ratio MTR measurements, and radio frequency RF no uniformity, so it is important to correctthe B1 errors inmagnetization transfer ratio measurements, so this paper will discuss about the methods of correction at large volumetric radio frequency RF field, and this correction based on the double-angle method DAM. Two factors are related with B1 field mapping techniques, the first one is double angle method DAM, and the other one is the fast spin-echo FSE, where the value of magnetization transferratio depends on the amplitude of the magnetization transfer MT pulse[1]. The aim from this paper to explain the B1 errors in the MTR and the method of correction of the errors, by using B1 field mapping, to obtain a minimum histogram dispersion of MTR,where the RF causes MTR histograms to be wide, thus the nonuniformity of B1 causes changes in the intensity of across MR images[2].

magnetic resonance, B1, correction

KUBÁSEK, R.; AL KHADDOUR, M.

2012

19. 8. 2012

Moscow

978-1-934142-22-6

PIERS 2012 in Moscow Proceedings

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