Abstract: A radio frequency power amplifier including control electronics for providing control signals for timing of the power amplifier. A first group of the drivers are coupled to the control electronics and a second group of drivers are coupled to the control electronics. The first group of drivers operate in response to the control signals to generate first drive signals and the second group of drivers operate in response to the control signals to generate second drive signals with a phase difference of 180° relative to the first drive signals. A first group of switches energize a first group of primary windings in response to the first drive signals and a second group of switches energize a second group of primary windings in response to the second drive signals. An output summing transformer has a plurality of ferrite cores, the first group of primary windings and the second group of primary windings passing through the ferrite cores.

Abstract: A present invention shows some schemes of a cross transducer with one transmit and one receive array for the three dimensional image acquisition. Designs of the cross transducer with and without a central shared element are described. Conditions for an extension of a frequency range and the method of an extended frequency range for use of the cross transducer are suggested. A new method of image formation allowed by the above is also presented.

Abstract: New apodization functions providing an effective rejection of side lobe amplitude level within wide range of beam steering angles are described in this invention. A central amplitude apodization function (13) reduces amplitudes for the central section of transmit and receive array individual elements. A time apodization function (14) changes a duration of transmit pulses. A duration of transmit pulses is short for central section of transmit array and increases for outlying transmit individual elements. A frequency apodization function (15) changes frequency of transmit pulses for different transmit individual elements. The use of new apodization function allows realization of portable acoustic scanners. Some versions of a portable acoustic scanner design and a version with time compression of echo signals are described.

Abstract: The present invention consists of a method for a fast acquisition of two dimensional images by the use of synthetic transmit and receive apertures formed in the schematics with cross transducers and can be used for the reconstruction of three dimensional images. The method of a fast two dimensional image acquisition preserves the flat beam generation and irradiation of the sector of an investigated part of a human body by a single transmit array. Simultaneously, a switching of transmit (or receive) arrays and irradiation of the same sector of a human body by different transmit arrays with a consequent fine shifting and summation of the received and digitized information in the region of interest provides an additional focusing of the transmit (or receive) beam along the coordinate parallel to the flat beam plane. The schematics of transducers for the realization of this method are described.

Abstract: Presented invention employs an ultrasound transducer that irradiates and receives the echo signals from an investigated part of a human body into a solid angle which is two times larger than for a prior art cross transducer. Preferred embodiment of the transducer has two transmit arrays turned at an angle of .+-..psi./2 out of the plane of the receive array. Transmit arrays form flat acoustic beams to provide the left (17) and right (18) field of views. Transmit and receive arrays are placed normally to each other. The extension of the field of view along the lateral coordinate is provided by a successive energizing of transmit arrays which form flat acoustic beams irradiating different sectors of a human body.

Abstract: This invention employs an ultrasound apparatus with a phased transducer having transmit and receive array systems to form an electronically scanned ultrasonic "pencil" beam (25) from crossed flat acoustic beams. The flat transmit beams and flat receive apertures are shaped by the arrays with size of individual elements on the order of the wavelength of a generated carrier frequency in a human body. The separation of array functions in the transmission and reception modes reducess the side lobe level and improves the noise performance. A fast method of acquisition of two dimensional images is described. This method uses a property of a dynamic focused and scanned flat acoustic beam together with the ability to shape flat synthetic receive apertures from digitized and memorized amplitude information.