Investigation of slice characteristics in nuclear magnetic resonance imaging

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Abstract
The quality of images and the accuracy of extracted relaxation time (T1 and T2) values in nuclear magnetic resonance (NMR) imaging is dependent on the characteristics of the slice. It is therefore important that the slice profile can be measured and to know how it behaves under different experimental conditions. Slice shape is determined in conventional selective excitation systems by the spectrum of the radiofrequency pulse used and the nature of the magnetic field gradient which is applied simultaneously. The effectiveness of the selection is also influenced by the subsequent rephasing gradient. Various methods have been used to investigate the slice shape in a practical situation using a 0.1 T resistive magnet NMR scanner and comparisons drawn with the predictions of theory.