Visualizing Slice Selection and Shaped Pulse Excitation profiles
What is slice selection? Routinely used in MRI, slice-selection refers to the excitation and observation of signals from only a specific, well-defined ‘slice’ of the sample, instead of the whole sample. In MRI, this could be a ‘slice’ of the human brain: Magnetic field gradient causes the center frequency ( F c ) of each slice to vary by position. The range of frequencies ( ΔF ) contained in a slice depends on slice thickness ( ΔF ) and the strength of the gradient ( G ss ). Source: https://mriquestions.com/slice-selective-excitation.html From an high-resolution NMR perspective, it most often refers to selectively observing different parts of the typical NMR tube, as described here in Glenn Facey’s blog . As also described in Facey’s blog, slice-selection is achieved by applying a linear gradient simultaneously with the excitation pulse, which is usually a shaped RF pulse. A key difference between slice selection in imaging applications vs high-resolution NMR is that imagi...