ABSTRACT
The choice of acquisition parameters made when using a spin-echo imaging sequence affects the gray-scale characteristics of the image (such as the contrast between different tissues), the spatial or geometrical characteristics of the image (such as pixel size), the noise properties of the image (how grainy it appears), and the time taken to acquire the data. We have already seen that the choice of time to echo (TE) and repetition time (TR) has a major effect on the image contrast, and leads to the possibility of acquiring T1-weighted and T2-weighted images. Image weighting is addressed in more depth in this chapter, and then the influence on the image of other parameters is introduced. The Saturation Recovery program is again used in this chapter, together with the Image Simulator-Spin-Echo program.
