Abstract: Ultrasonic transmission imaging apparatus utilizing a pair of focused, large aperture transducers colinearly aligned and facing one another on opposite sides of a target. The receiving transducer and transmitting transducer are positioned to have a common focal point within the target. The transmitting transducer is energized by a continuous noncoherent noise source, and ultrasonic images are formed from the intensity modulation of the transmitted ultrasound at the receiving transducer.

Abstract: A filter for an aquarium tank and apparatus for cleaning and aerating water within the tank. A pair of spaced apart but perforated walls are located above and spaced from the bottom wall of the tank forming an enclosure. Filter material is located between the perforated walls. A cylindrical housing extends through the perforated walls having a closed but perforated top end and an open bottom end opening into the enclosure. An upstanding tube extends through the housing having an open top end. Pressurized air is directed into the upstanding tube. A tube extends into the upstanding tube allowing water within the tank to flow into the upstanding tube. The air and water then flow upwardly through the tube and through the housing with the air escaping from the housing. The water then flows downwardly between the housing and tube and eventually upward through the filter material. Means are provided for reversing the water flow for cleaning of the filter.

Abstract: Ultrasonic probe apparatus for real time B-mode sector scan examination of a cross section of a structure such as the human heart. A transducer is pivotally mounted near an end of an elongated housing, and linkage means are provided in the housing for oscillating the transducer about an axis whose plane is approximately perpendicular to the longest dimension of the housing. Means are provided for causing the transducer to produce ultrasonic pulses which are reflected by interfaces of the object under examination, and the echoes from these interfaces are returned through the transducer to a B-mode display system. A B-mode sector sweep circuit is provided to produce a B-mode display of the echo pattern received from the structure being observed.

Abstract: Ultrasonic probe apparatus for real time B-mode sector scan examination of a cross section of a structure such as the human heart. A transducer is pivotally mounted near an end of an elongated housing, and linkage means are provided in the housing for oscillating the transducer about an axis whose plane is approximately perpendicular to the longest dimension of the housing. Means are provided for causing the transducer to produce ultrasonic pulses which are reflected by interfaces of the object under examination, and the echoes from these interfaces are returned through the transducer to a B-mode display system. A B-mode sector sweep circuit is provided to produce a B-mode display of the echo pattern received from the structure being observed.

Abstract: An ultrasonic apparatus is used for diagnosis and therapy of patients being treated for post-myocardial infarction. The instrument administers treatment prescribed by the physician in response to signs and symptoms continuously being monitored by the diagnostic portion of the instrument. Both the diagnosis and the treatment are non-invasive and atraumatic in nature. The diagnostic portion of the instrument is sensitive to conditions which are potentially hazardous to the patient's life, such as premature ventricular contractions, low cardiac output, and formation of secondary lesions, and initiates treatment capable of reversing these undesirable conditions. An ultrasonic transduer for producing low level ultrasound is positioned upon the chest of the patient and is acoustically coupled to the skin.