Real-Time Constant Depth Scanning with Phased Arrays
Constant depth scanning (C-scanning) differs from B-scanning in that the imaged cross-section lies in a plane which is perpendicular to the scanning beam rather than in a plane which contains it. The potential merits of C-scanning in medicine include the ability to image cross-sections which lie parallel or nearly parallel to the body surface, e.g. coronal cross-sections of the orbit or breast, and the ability to take advantage of strong focussing since large beamwidths before or after the focal zone are irrelevant. Since the high lateral resolution, high sensitivity and large angular aperture of a strongly focussed beam are qualities which are well suited to the detection and mapping of scattered ultrasound, C -scanning is a promising mode for tissue differentiation.
KeywordsFocal Length Continuous Wave Delay Line Field Point Range Resolution
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