AN ACOUSTIC INJECTION TEST OBJECT FOR COLOR-FLOW IMAGING-SYSTEMS

There are few test objects suitable for colour-flow ultrasound scanner s, An acoustic injection device is described that enables the producti on of a 2-D region of colour an a colour-how image. The device involve s detection of the transmitted ultrasound pulse from the scanner, foll owed by the emission of a synthesised echo that consists of a radiofre quency burst modulated by an audiofrequency signal in such a way that, on reception by the ultrasound scanner, it is interpreted as a signal arising from a region of how. The depth of the colour region may be c ontrolled by adjustment of the length of the synthesised echo, The aud iofrequency content may be altered as desired, enabling examination of the relationship between the displayed colour and the signal spectral content. (C) 1998 World Federation for Ultrasound in Medicine & Biolo gy.