title: A simple device to reproduce the spatial orientations of the thorax and transducer for serial M-mode and two-dimensional echocardiograms.
abstract: We have described a device consisting of three circular levels for locating the spatial orientations of the thorax and a transducer that can be used to reproduce the path of the sonic beam through the heart.
mesh_terms: D004452:Echocardiography / Q000295:instrumentation* / Q000379:methods; D014159:Transducers