ABSTRACT
In the previous chapter it was clear that there is considerable potential to harness the relaxation properties of tissues to generate contrast between tissues in an image. The next important consideration relevant to image generation is how to match the acquired signal to a location within the subject, which is a process termed spatial localization. There are three different steps, and all three make use of magnetic gradient fields. This chapter starts with an overview of magnetic field gradients, and then we consider the first of the three steps required. This is slice selection. The principles are described and the interactive Slice Selection program is used to demonstrate how slice thickness and location can be selected.
