TABLE 2

Relative Effect of CT Misregistration on Change in AC-MPI Polar Map Score

Magnitude of misregistration (pixels)Region
Direction of misregistrationAnteriorApexInferiorSeptumLateral
Cephalad (+z-axis)3
2+
1+
Caudal (−z-axis)1++++
2− −+++
3− −+++
Dorsal (+y-axis)3− −− −+
2− −− −+
1+
Ventral (−y-axis)1++
2++− −
3++− −+− − −
Left (+x-axis)3− −+
2+
1+
Right (−x-axis)1++++
2++++
3++ +− −
  • Difference with respect to registered SPECT/CT: + + + = positive change of ≥15%; − − − = negative change of ≤−15%; + + = positive change of <15% and ≥5%; − − = negative change of >−15% and ≤−5%; + = positive change of <5% and >0%; − = negative change of >−5% and <0%.