TABLE 2

Effects of Misregistration and Their Correction on Size and Severity of Image Defects

ProtocolNonshifted (mean ± SD)Shifted (mean ± SD)P value
Using rest attenuation data of early MAC group (n = 54)
    Severity*70.15 ± 7.2780.08 ± 6.60<0.001
    Combined size and severity†0.141 ± 0.1300.091 ± 0.100<0.001
Using postdipyridamole attenuation of late MAC group (n = 55)
    Severity*69.52 ± 7.7478.64 ± 7.45<0.001
    Combined size and severity†0.102 ± 0.1290.038 ± 0.069<0.001

  • ↵* Severity = lowest quadrant average relative activity.

  • ↵† Combined size and severity = percentage of cardiac image with relative activity of <60% of maximum activity.