(cont'd) (C). Quantitative gated SPECT analysis (normal female patient). Left ventricular ejection fraction (LVEF) is 84%: in patients with end-systolic LV volume <15mL EF is often overestimated. Nevertheless there is quantitative proof of normal LV wall motion and thickening, with a summed wall motion (SMS) and summed wall thickening score (STS) of 0. The LV time–volume curve shows excellent diastolic function (rapid filling due to rapid relaxation in the early diastolic time and second peak filling due to atrial contraction in the late diastolic phase).