99mTc-methoxy-isobuthyl-isonitrile SPECT to evaluate a perfusion index from regional myocardial uptake after exercise and at rest. Results of a four hour protocol in patients with coronary heart disease and in controls - Büll, U; Dupont, F; Uebis, R; Kaiser, HJ; Kleinhans, E; Reske, SN; Hanrath, P (Nucl Med Comm, 1990)