ABSTRACT
In this chapter no further new concepts are introduced. Instead, material from the earlier chapters is brought together to introduce two further imaging sequences and to describe the effect of flowing blood on images. The inversion recovery imaging sequence, and its use to null the signal from a selected tissue, is covered first. Two programs associated with inversion recovery are used here: the Inversion Recovery program, which plots recovery curves, and the Image Simulator-Inversion Recovery program. The second new imaging sequence is the gradient-echo imaging sequence, which is faster than spin-echo imaging. The chapter continues with a discussion of flow, covering both its effects on an image and the techniques used to image flowing blood. The interactive Flow Phenomena program is used to support the description of flow phenomena in the spinecho sequence, especially concerning the relationships among the flow velocity, slice thickness, and time to echo (TE).
