34 Chapter 2 Figure 2 presents the correspondence of SRTM BPND values obtained with the shortened scan durations using POP-IP_2T4k_VB for reference region interpolation against SRTM BPND values estimated from the original scan duration. The bias increased as the first part was shortened. An underestimation of 9 % was observed for SRTM BPND values with the shortened scan duration for both groups (0–30/80–100 min) with respect to that obtained with original scan duration. SRTM R1 values derived from the shortened scan duration (0–30/80–100 min) showed excellent correlations with SRTM and RPM R1 values obtained with the original scan duration for HC and AD patients for each interpolation method (r2 > 0.95, Supplementary Table 3).
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