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. 2020 Nov 27;41(7):1658–1668. doi: 10.1177/0271678X20973951

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Figure 2. — Bland-Altman plots comparing OEF values in whole brain between PET and QQ scans. (a) PET scan 1 vs. PET scan 2. (b) QQ scan 1 vs. QQ scan 2. (C) PET average vs. QQ average. PET and QQ show small scan to rescan variations (average OEF difference: 3.9%, p < 0.009 for PET and 0.4%, p = 0.7 for QQ). The average difference between PET and QQ is not significant (−1.4%, p = 0.5). The OEF agreement interval (distance between the two dashed line) between PET and QQ average is similar to the one between scan-rescan within each method. The unit in the x- and y-axis is %.