Papers Published

1. Barr, R.C. and Gallie, T.M. and Spach, M.S., Construction of isochrone or isopotential maps for cardiac electrophysiology, IEEE 1980 Frontiers of Engineering in Health Care (1980), pp. 13 - 18 .
   (last updated on 2007/04/12)

   Abstract:
   Computerized construction of maps provides a means for many maps of high accuracy to be obtained. The authors' solution strategy divides the system into components for: 1) processing of the potential or time values to be shown on the map, 2) organizing of map geometry, reflecting the electrodes and their placement, 3) selection of map `style', i.e. such things as the number of contour lines, and 4) drawing the contour maps. Among the major variables in such maps are the number of electrodes and their arrangement on the appropriate anatomical surface. A critical element in the consideration of map geometry is the construction of special data structure, called an edge table. The edge table specifies the relation of nearby electrodes to each other. The edge table also is the basis for a rapid contouring algorithm, readily executed on laboratory computer facilities. Following identification of a set of points on each contour line bicubic interpolation is utilized to make visually smooth contour lines instead of straight line segments. The procedures described are used routinely for numerous clinical and experimental protocols with highly satisfactory results

   Keywords:
   computerised signal processing;electrocardiography;field plotting;