ULTRASONIC DOPPLER DIAGNOSTIC APPARATUS

摘要

PURPOSE:To rapidly and visually grasp the timewise change pattern of a speed vector by displaying the speed and direction of the moving reflecting body in a living body as vectors by arrows and displaying the terminal loci of the respective vectors. CONSTITUTION:The receiving signal issued from a receiver 14 is inputted to a radius vector operation part 16 and a tangential speed operation part 18 to obtain radius vector speed and tangential speed and the magnitude V and direction phi of speed are calculated by an absolute flow velocity operation part 20 and the length and direction of a vector are calculated corresponding to the magnitude V and direction phi of the input signal in vector length and vector direction operators 22, 24. These vector data are temporarily held to a graphic memory 26 and the stored data of a speed vector Vn is converted to analogue data through a control circuit 28 by the keyboard operation of a user to be displayed on a CRT 34 by an arrow. At the same time, the terminal data of the speed vector Vn and speed vector Vn-1 stored and held in the memory 26 are drawn by the command from the circuit 28 as the terminal loci of the vectors through a vector terminal tracing device 36.