A novel analysis of selective excitation and phase reversal

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

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Original languageEnglish
Pages (from-to)448-458
Journal / PublicationJournal of Magnetic Resonance (1969)
Issue number3
Publication statusPublished - Jul 1987
Externally publishedYes


The Bloch equations are reanalyzed in a spherical coordinate system for shaped RF pulses applied in the presence of a static magnetic field gradient. In such a system the behavior of large angle-selective RF pulses can be better compared to small angle nutations and in particular the performance of 180° pulsed use for spin inversion and phase reversal can be better described. It is found that the major problem using conventional 180° sinc-shaped pulses is the phase change that arises when the magnetization passes through the transverse plane. Alterations in the magnetic field gradient compensate for such a phase change and thereby improve the performance of selective pulses for both spin inversion and phase reversal. © 1987.