Ultrasonic Diagnostics: Capabilities of Present Systems
No matter what the final display may be, similar considerations apply to the resolutions of all ultrasonic pulse-echo systems. In range, the resolution is determined by the duration of the pulse, and in azimuth and elevation, by the width of the beam. The pulse is generally the limiting component, and the dimensions of the scanned anatomy control the choice of wavelength. Gray scale display of a wide range of echo amplitude can give additional diagnostic information. In Doppler systems, zero-crossing detectors can give rise to errors, which can largely be avoided by the use of frequency spectrum analysis.
KeywordsRange Resolution Ultrasonic Beam Storage Surface Doppler System Additional Diagnostic Information
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