title: Myocardial perfusion defects in contrast echocardiography: spatial and temporal localisation.
abstract: The position and size of experimental myocardial perfusion defects can be detected by using the echocardiographic contrast-medium Echoson together with digital image processing techniques. Video tapes showing the important sequences before, during and after cardial inflow of echo-enhancing agents are fed in total length into a digital image processing unit. The myocardial circumferences are then chosen interactively. All the frames are analysed and a synthetic picture is compiled, and shows the myocardial echo densities in a single, highly condensed form. Digital subtraction of blank values (condensed sequences before injection of contrast medium) greatly improves readability. Further concentration of the remaining information yields the following diagrams: flow/circumferential position (time summation); flow/time (position summation), which contain the desired information on homogeneity or defects of echo density against time and myocardial position.
mesh_terms: D000818:Animals; D003201:Computers; D003287:Contrast Media; D003326:Coronary Circulation; D004285:Dogs; D004452:Echocardiography / Q000379:methods*; D007089:Image Enhancement; D013997:Time Factors; D014743:Videotape Recording
chemical_list: D003287:Contrast Media