title: [Collimator for measuring coronary circulation with the aid of precordial counting].
mesh_terms: D003326:Coronary Circulation; D006801:Humans; D010992:Plethysmography, Impedance / Q000295:instrumentation* / Q000379:methods; D011865:Radioisotope Dilution Technique / Q000295:instrumentation*; D012413:Rubidium
chemical_list: D012413:Rubidium