Improved ultrasound image detail using wide aperture, focused transducers

Image resolution of anatomic parts located 3--4 cm below the skin surface can be improved with current digital B-scanners and a large aperture, high frequency, focused transducer. Such a transducer that has a very sharp focus over a limited depth of focus is described. The width of the field of view is unlimited, and image detail approaches that obtained with specialized real time scanners, although performance of the examination may not be as convenient or rapid. Examples of improved resolution are given for the thyroid, carotid artery, infant pancreas, ovary, and placenta.