RAPID MEASUREMENT OF THE SPATIAL-RESOLUTION OF COLOR-FLOW SCANNERS

An acoustic grid for rapid measurement of the spatial resolution of co lour velocity images is described, The grid is composed of alternate w idths of acoustic window and acoustic attenuator, Attenuation is provi ded by the use of a layer of waterproof paper, which is wrapped in clo se contact with a tube of a how phantom, The colour image consists of several closely spaced lines, When the grid line spacing is less than the spatial resolution, the colour lines cannot be separately visualis ed, The use of several grids of different spacing provides a measure o f the spatial resolution, It is shown that the spatial resolution is d ependent on the position of the focal zone, (C) 1997 World Federation for Ultrasound in Medicine & Biology.