(a) Conventionally, multidimensional NMR experiments have been sampled on regular grids. In this example, we depict an experiment with 8 × 8 = 64 sampling points. (b) In radial sampling, data are collected at evolution times falling on radial spokes. Because it is often possible to determine spectral information from a small number of radial spokes, each of those spokes can be measured to longer evolution times than for a conventional experiment of the same duration. Here, we show a radial experiment with four spokes each of 16 points; the number of samples and resulting measurement time are the same as in (a), but the resolution has been doubled. (c) Radial sampling is in fact a sampling in polar coordinates.