end systolic volume can be used clinically as a measurement of the adequacy of cardiac emptying, related to systolic function. on an electrocardiogram, or ecg, the end-systolic volume will be seen at the end of the t wave. clinically, esv can be measured using two-dimensional echocardiography, mri (magnetic resonance tomography) or cardiac ct (computed tomography) or spect (single photon emission computed tomography).