Electronic device for scintillation camera physiological driving

The cardiac and breathing motions induce kinetic blurring on scintigraphic images. The realization of a device 'Pilotix' made of three probes taking the electrocardiographic and breathing signals is described. One can select the ends of systolic and diastolic stages or the respiratory pause phase, these lengths of signal appear on the scope as overbright. This device was connected with scintillation cameras. The clinical results show mainly an increasing resolution power on the organs outlines. Some equivocal interpretation on edge defects can be solved. In abdominal exploration the moving ability of one part or the whole organ with breathing motion can be appreciated. Images done during inspiratory and expiratory phases on the liver and the lungs demonstrate these organs deformation and translation very often associated with a rotation. This last kind of motion forbids all the type of corrections made on the only translation and the barycentric method which does an average correction for the whole organ. In cardiac exploration, the realization of ventricular and myocardic scintigraphies with systolic and diastolic selection allows a better detection of a ventricular ectasia or myocardic perfusion defects and dyskinetic motion. The determination of the ejection fraction can be made from the images by the area method. Pilotix has the advantage of simplicity for selecting isovolumetric phases with respect of cardiac rythm