educations e-book

Introduction

B-mode imaging was combined with pulsed Doppler frequency analysis in the mid-1970s to provide anatomic feedback on the actual site of flow measurement without regard for the actual visualization of the flow itself. Throughout the 1980s, flow was “visualized” by discrete sampling of specific sites by placing the pulsed Doppler sample volume at regions of interest. When color Doppler imaging was introduced in the late 1980s, this allowed for the first time the qualitative analysis of bloodflow characteristics over a larger region of interest. Throughout the 1990s, technology continually improved the quality of color Doppler displays such that it has become as widely used as gray scale imaging for the evaluation of patients with vascular disease.

Download E-Book Lengkap