32 Chapter 2 Table 2. Shortened time intervals interpolated using four different methods are compared with plasma input DVR-1 and SRTM BPND obtained with the original scan duration DVR-1 (0-60/80-130) SRTM BPND (0-60/80-130) HC AD HC AD r2 Slope r2 Slope r2 Slope r2 Slope POP–IP 2T4k_VB SRTM BPND (0-50/80-100) 0.96 0.96 0.91 1.01 0.98 1.04 0.99 0.93 SRTM BPND (0-40/80-100) 0.95 0.96 0.91 0.99 0.98 1.03 0.99 0.91 SRTM BPND (0-30/80-100) 0.93 0.94 0.92 0.97 0.96 1.02 0.98 0.89 Cubic SRTM BPND (0-50/80-100) 0.96 0.94 0.91 1.01 0.99 1.02 0.99 0.93 SRTM BPND (0-40/80-100) 0.96 0.95 0.91 0.98 0.99 1.02 0.99 0.90 SRTM BPND (0-30/80-100) 0.94 0.91 0.91 0.92 0.97 0.98 0.98 0.85 Linear SRTM BPND (0-50/80-100) 0.96 0.93 0.91 0.98 0.99 1.02 0.99 0.90 SRTM BPND (0-40/80-100) 0.96 0.95 0.91 0.92 0.98 1.03 0.99 0.84 SRTM BPND (0-30/80-100) 0.94 0.91 0.91 0.84 0.96 0.98 0.98 0.76 Exponential SRTM BPND (0-50/80-100) 0.96 0.94 0.91 1.01 0.99 1.02 0.99 0.93 SRTM BPND (0-40/80-100) 0.96 0.96 0.90 0.97 0.98 1.04 0.98 0.90 SRTM BPND (0-30/80-100) 0.94 0.92 0.90 0.92 0.96 0.99 0.97 0.85 The correspondence of SRTM BPND with DVR-1 for the original scan duration was r2 = 0.96, slope=0.90 for HC and r2=0.93, slope=1.09 for AD subjects.
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