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Various forms of coherence factor have been proposed to improve spatial resolution and suppress acoustic clutters. Regardless of the forms of definition, coherence factors evaluate focusing quality at given field points based on the degrees of coherence of the aperture data. These methods work effectively for coherent sources such as pin targets, whose(More)
BACKGROUND Ultrasonic imaging methods of receiving at higher frequencies, which are multiples of the transmitting frequencies (harmonic imaging), are well established as a means of improving myocardial visualization in association with intravenous contrast administration. This exploratory study examined the effect of using receive frequencies that were(More)
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