1. You are imaging two types of tissue. Image parameters are matrix size 256 x 256, FOV 5 cm, slice thickness 0.5 mm, one slice. Tissue A has T1=1310 ms, T2=70

ms, T2*=62ms. Tissue B has T1-850 ms, T2=115 ms, T2*-57 ms. Proton density is similar for the two tissues. Calculate the contrast between the two tissues for: a. A SE sequence with TR sufficiently long to allow full relaxation between successive lines of k space and a TE of 85 ms b. A GE sequence with a flip angle of 65 degrees, a TR of 450 ms, and a TE of 8 ms