What is the transient ischaemic dilatation ratio? (TID ratio)
Stress volume : Rest volume
Full myocardial SPECT Lexiscan study
Full study with all three orthogonal planes. There is a small, fixed apicoseptal perfusion defect as well as transient ischaemic dilatation with stress. The green arrows point to representative pairs of stress/rest images (stress on top, rest on bottom), demonstrating an increase in the size of the left ventricle with stress (TID ratio 1.34).