Table 2: The prevalence of true positive (TP), false positive (FP), true negative (TN), and false negative (FN) myocardial perfusion imaging (MPI) studies is compared for patients within each cohort that underwent clinically-indicated invasive coronary angiography (ICA) within one year. Positive predictive value (PPV) and sensitivity are calculated for each of the three coronary artery distributions and for the study as a whole.

Prevalence of different test outcomes (among patients who also had ICA)
SPECT (n = 36) SPECT-CT (n = 26) SPECT (n = 36) SPECT-CT (n = 26)
TP FP
LAD 22% 42% p = 0.10 LAD 25% 4% p = 0.04
LCx 19% 23% p = 0.76 LCx 19% 8% p = 0.28
RCA 33% 42% p = 0.79 RCA 22% 8% p = 0.17
Overall 25% 62% p = 0.008 Overall 56% 19% p = 0.00
FN TN
LAD 14% 27% p = 0.33 LAD 39% 27% p = 0.42
LCx 8% 35% p = 0.02 LCx 53% 35% p = 0.20
RCA 3% 25% p = 0.02 RCA 42% 25% p = 0.18
Overall 6% 12% p = 0.64 Overall 14% 8% p = 0.69


PPV SPECT SPECT-CT
LAD 0.47 (0.23 to 0.71) 0.92 (0.76 to 1)
LCx 0.5 (0.24 to 0.76) 0.75 (0.45 to 1)
RCA 0.6 (0.39 to 0.81) 0.83 (0.62 to 1)
Overall 0.28 (0.11 to 0.44) 0.76 (0.58 to 0.94)
Sensitivity
LAD 0.62 (0.35 to 0.90) 0.61 (0.38 to 0.80)
LCx 0.7 (0.42 to 0.98) 0.4 (0.15 to 0.64)
RCA 0.92 (0.78 to 1) 0.63 (0.39 to 0.86)
Overall 0.8 (0.62 to 0.98) 0.84 (0.68 to 0.94)