摘要:
The described embodiments relate to methods, systems and uses for therapeutic ultrasound, and in particular, to methods, systems and uses for therapeutic ultrasound and contact lenses for treating or alleviating eye conditions. The described embodiments relate to methods, systems and uses that involve an ultrasound device configured for treatment of an eye condition and a contact lens protects ocular tissue of the eye and forms a chamber of air.
摘要:
A transducer with triangular cross-sectional shaped pillars is described for suppressing lateral modes within a composite, and a method for producing the same. According to one aspect of the present application, a plurality of triangular cross-sectional shaped pillars extends outwardly from a substrate and form an array of pillars. The resulting array of pillars is configured to suppress the lateral modes of the transducer at higher operating frequencies, such as, at or above 15 MHz, at or above 20 MHz, or at or above 30 MHz.
摘要:
A system for acquiring an ultrasound signal comprises a signal processing unit adapted for acquiring a received ultrasound signal from an ultrasound transducer having a plurality of elements. The system is adapted to receive ultrasound signals having a frequency of at least 20 megahertz (MHz) with a transducer having a field of view of at least 5.0 millimeters (mm) at a frame rate of at least 20 frames per second (fps). The signal processing can further produce an ultrasound image from the acquired ultrasound signal. The transducer can be a linear array transducer, a phased array transducer, a two-dimensional (2-D) array transducer, or a curved array transducer.
摘要:
An ultrasonic transducer comprises a stack having a first face, an opposed second face and a longitudinal axis extending therebetween. The stack comprises a plurality of layers, each layer having a top surface and an opposed bottom surface, wherein the plurality of layers of the stack comprises a piezoelectric layer and a dielectric layer. The dielectric layer is connected to the piezoelectric layer and defines an opening extending a second predetermined length in a direction substantially parallel to the axis of the stack. A plurality of first kerf slots are defined therein the stack, each first kerf slot extending a predetermined depth therein the stack and a first predetermined length in a direction substantially parallel to the axis. The first predetermined length of each first kerf slot is at least as long as the second predetermined length of the opening defined by the dielectric layer and is shorter than the longitudinal distance between the first face and the opposed second face of the stack in a lengthwise direction substantially parallel to the axis.
摘要:
A photoacoustic device capable of performing both intravascular photoacoustic (“IVPA”) imaging and intravascular ultrasound imaging is provided. The device includes one or more optical fibers coupled to a transducer assembly that includes an photoacoustic transducer and optionally an ultrasound transducer. The one or more optical fibers and photoacoustic transducer are arranged such that the illumination field generated by the one or more optical fibers is co-aligned with the sensitive region of the photoacoustic transducer. When both are present, the photoacoustic transducer and ultrasound transducer are arranged such that ultrasound generated by the ultrasound transducer avoids interfering with the sensitive region of the photoacoustic transducer. Frequency domain imaging may be achieved using an intensity-modulated continuous wave (“CW”) laser coupled to the one or more optical fibers.
摘要:
An ultrasonic transducer comprises a stack having a first face, an opposed second face and a longitudinal axis extending therebetween. The stack comprises a plurality of layers, each layer having a top surface and an opposed bottom surface, wherein the plurality of layers of the stack comprises a piezoelectric layer and a dielectric layer. The dielectric layer is connected to the piezoelectric layer and defines an opening extending a second predetermined length in a direction substantially parallel to the axis of the stack. A plurality of first kerf slots are defined therein the stack, each first kerf slot extending a predetermined depth therein the stack and a first predetermined length in a direction substantially parallel to the axis. The first predetermined length of each first kerf slot is at least as long as the second predetermined length of the opening defined by the dielectric layer and is shorter than the longitudinal distance between the first face and the opposed second face of the stack in a lengthwise direction substantially parallel to the axis.
摘要:
A high frequency focused transducer may be formed by fabricating a piezoelectric or ferroelectric wafer of a thickness less than about 100 microns and bonding a malleable sheet to the wafer with a thin layer of adhesive. Thereafter, the composite may be pressed into a spherical mold to form a curved transducer without fracturing the wafer. In another embodiment, a conductive adhesive layer may be applied to the wafer to a thickness sufficient to hold the wafer in a curved state, when set. After the adhesive is set, the composite may be pressed into the mold while the adhesive is held at an elevated temperature whereat it is elastic. Thereafter the composite is cooled so that the adhesive layer is stabilized and the curved transducer is removed from the well.
摘要:
A system for producing an ultrasound image comprises a scan head having a transducer capable of generating ultrasound energy at a frequency of at least 20 megahertz (MHz), and a processor for receiving ultrasound energy and for generating an ultrasound image at a frame rate of at least 15 frames per second (fps).
摘要:
A transducer with triangular cross-sectional shaped pillars is described for suppressing lateral modes within a composite, and a method for producing the same. According to one aspect of the present application, a plurality of triangular cross-sectional shaped pillars extends outwardly from a substrate and form an array of pillars. The resulting array of pillars is configured to suppress the lateral modes of the transducer at higher operating frequencies, such as, at or above 15 MHz, at or above 20 MHz, or at or above 30 MHz.
摘要:
An ultrasound scanning system includes an array of transducer elements and an electrode array, movable with respect to the array to transducer elements. The electrode array is in electrical contact with transducer elements from the array of transducer elements which are immediately adjacent to the electrode array. The piezoelectric ceramic material is situated between the two-dimensional array of electrodes and the common ground electrode. Each electrode in the two-dimensional array of electrodes is electrically isolated from the other electrodes in the two-dimensional array of electrodes. The piezoelectric ceramic material may be arranged to form pillars, each pillar extending from an electrode from the two-dimensional array of electrodes to the common ground electrode. The movable electrode array is mounted on, for example, a thin Mylar membrane. The movable electrode array may be arranged in a variety of patterns. For example, the movable electrode array may be a single electrode, a plurality of annuli, a linear array or in a Fresnel pattern. Alternately, the electrode array may be mounted on a plate rotated with respect to the array of transducer elements.