Abstract: A multilayer backing for an ultrasonic transducer array comprises at least two layers in contact with each other. The first layer is formed from a first composition comprising an epoxy resin base and a powder. The second layer is formed from a second composition comprising an epoxy resin base, a powder, and at least one of a phenolic shell micro-balloon and a plasticizer. The first layer is more rigid than the second layer so that the first layer provides mechanical support for the array, while the second layer provides maximal sound absorbance.

Abstract: A method for transferring heat away from an ultrasonic medical transducer having a face wherein heat is generated. The method is accomplished by positioning a heat sink behind the transducer face, securing the heat sink to a braided power cable, applying a heat conductive epoxy to the heat sink, and assembling a plastic housing around the heat sink. The transducer face is cooled by conductive heat transfer by transferring the heat into the heat sink, then transferring the heat into the epoxy, then transferring the heat into the power cable and the plastic housing before finally dissipating into the surrounding air.

Abstract: Ultrasound imaging apparatus has a probe disposed on a longitudinal axis. A linear array of ultrasound transducer elements is arranged along the axis of the probe. The array is alternatively held stationary and oscillated relative to the probe about the axis between limits to define a sector. In a first mode, the transducer elements are actuated successively while the array is held stationary to generate a longitudinal rectilinear scan. In a second mode, some of the transducer elements are actuated repeatedly while the array is oscillated to generate a transverse sector scan orthogonal to the longitudinal scan. The echoes received by the transducer elements in the first and second modes are displayed as images of respective orthogonal planes. In either case, the user selects the position of the scan plane within the field of view of the array while the probe is held in a stationary position against the skin of the patient.