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EJNMMI Reports
Fig. 5 | European Journal of Hybrid Imaging

Fig. 5

From: Static CT myocardial perfusion imaging: image quality, artifacts including distribution and diagnostic performance compared to 82Rb PET

Fig. 5

The Passing–Bablok method of comparison demonstrates a proportional bias between the two semi-quantitative visual methods of myocardial perfusion assessment (slope = 6.86, y-intercept = 0, n = 43). The blue solid line indicates the slope of CT-MPI iTPD% measurements plotted against the perfect-fit line (dotted red line, slope = 1). The dotted blue line shows the lower limit of the 95% CI which does not include the perfect-fit line and hence, the proportional bias. The proportional bias indicates that the CT-MPI derived iTPD% overestimation of 82Rb PET derived iTPD% progressively increases with an increase in perfusion abnormalities as identified by 82Rb PET. The CUSUM (cumulative summation) test shows that the observed data does not significantly deviate from a linear model (P = 0.53). CT-MPI computed tomography myocardial perfusion imaging; 82Rb PET 82-Rubidium positron emission tomography; iTPD% ischemic total perfusion deficit % based on visual semi-quantitative methods

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