Abstract: A multi-mode scanner head employing split (semicircular transducers) is described. In some modes such as simultaneous B-scan and M-scan each transducer moves independent of the other. For continuous Doppler mode the transducers move together. The relatively small, hand-held scanner head is particularly useful for cardiac examinations.

Abstract: A data acquisition head for an ultrasonic imaging system which employs a plurality of transducers is disclosed. The transducers are rotated in a liquid filled chamber at a constant rate, each about an axis perpendicular to its transmission axis. The transducers are sequentially activated as their transmission axes cross a semi-rigid membrane which is in contact with the body. The acoustic impedance of the liquid and membrane, and the thickness of the membrane, are matched to enhance transmission. In one embodiment, the membrane is one-half or a full wavelength thick and comprises a low density polyethylene and the liquid has an acoustic impedance approximately equal to that of the polyethylene.

Abstract: A data acquisition head for an ultrasonic imaging system which employs a plurality of transducers is disclosed. The transducers are rotated in a liquid filled chamber at a constant rate, each about an axis perpendicular to its transmission axis. The transducers are sequentially activated as their transmission axes cross a semi-rigid membrane which is in contact with the body. The acoustic impedance of the liquid and membrane, and the thickness of the membrane, are matched to enhance transmission. In one embodiment, the membrane is one-half or a full wavelength thick and comprises a low density polyethylene and the liquid has an acoustic impedance approximately equal to that of the polyethylene.

Abstract: In an improved system for medical imaging employing a transducer for transmitting and detecting ultrasonic vibrations, a digital scan converter accepts echo signals detected by the transducer and transducer position signals identifying the point of origin of the signals in a scanning plane transversely oriented relative to the body of the patient under study. The amplitudes of the echoes detected are stored at memory locations associated with the points of origin of the echoes. Peak detection analysis is performed on large echoes emanating from higher impedance tissue interfaces within the scanning plane, while cumulation and normalization analysis is performed on small echoes emanating from low impedance tissue interfaces within the scanning plane.

Abstract: A target for electronic storage tubes of the non-direct viewing type having a target comprised of substantially coplanar insulating and conducting areas wherein the insulating area is provided on one face of the conducting area in a predetermined and preferably striped pattern. The insulating pattern is comprised of at least a layer of ionizing radiation insensitive material taken from the group of materials comprised of silicon nitride, silicon oxynitride, aluminum oxide.