Figure 3: A reconstructed slice subject 3 (healthy) in Table 1. The regions of interest are shown in (a). The ROIs for the left stratium, right striatum, the reference region, and the region outside the brain are drawn in yellow, cyan, magenta, and red, respectively. The reconstructed slice is shown without downscatter correction (b) and with downscatter correction (c). Note the lower background and the improved contrast between the striatum and reference region. The amount of counts in the striata is slightly lower with correction, and the background outside the head is minimized by the correction.