32 Faster and Stronger Gradients: Part 1

The two main factors describing the strength of a gradient system are the maximum amplitude of the gradient and the rise time to achieve this maximum gradient. Figure 32.1 illustrates the consequences of stronger and faster gradient systems on the imaging capabilities of a gradient echo sequence. The frequency range for the excited slice is usually untouched, dictating the amplitude for the slice select gradient (GS). The same situation applies to the selected bandwidth per pixel, dictating the amplitude for the readout gradient (GR) during readout. The most important part, therefore, is how fast the gradients can achieve their normal value, so that the excitation can begin and the data can then be sampled. The faster the gradient (Fig. 32.1B

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