Affiliation:
1. Radiology Department, Aultman Hospital, Canton, Ohio; Radiology Department, St. Joseph Hospital and Health Center, Lorain, Ohio.
Abstract
An overview of signal-processing techniques used in the acquisition, display, manipulation, and analysis of echo scan data is presented. The principles of time-gain compensation, selective enhancement, log compression, fill-in interpolation, edge enhancement, image updating, write zoom, gray scale mapping, black/white inversion, freeze frame, frame averaging, read zoom, thresholding, contrast enhancement, filtering, and region-of-interest definition are reviewed. The concept of gray scale mapping, which dictates how the stored scan data are displayed, is explained with many illustrative examples.
Subject
Radiology Nuclear Medicine and imaging,Radiological and Ultrasound Technology
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