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FIG 4. Effect of the addition of two separate magnitude images from echoes E1 and E2 in the modified fast spin-echo train in figure 1A. Coronal single-shot images from a 74-year-old patient with a large ischemic lesion (arrow, F) were recorded using the half-Fourier approach. Section thickness, 12 mm; FOV, 175 x 350 mm; matrix, 96 x 256.
A–C, TE = 155; no diffusion sensitivity.
D–F, TE = 155; diffusion preparation with a b value of 1000 s/mm2.
A and D are images from echoes E1; B and E are images from echoes E2; C and F are the addition of images from E1 and E2. Signal intensity is doubled, whereas noise increases by a factor of 
. CNR of the lesion versus normal brain is 11 in F.
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