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By changing the pulse delays, the computer can scan the beam of ultrasound in a raster pattern across the tissue. Echoes reflected by different density tissue, received by the transducers, build up an image of the underlying structures. Weld examination by phased array. TOP: The phased array probe emits a series of beams to flood the weld with ...
An active phased array or active electronically scanned array (AESA) is a phased array in which each antenna element has an analog transmitter/receiver (T/R) module [13] which creates the phase shifting required to electronically steer the antenna beam. Active arrays are a more advanced, second-generation phased-array technology that are used ...
A transducer may be swept mechanically by rotating or swinging or a 1-D phased array transducer may be used to sweep the beam electronically. The received data is processed and used to construct the image. The image is then a 2-D representation of the slice into the body.
The unique properties of the method enable the investigation of specific features of the acoustic field (e.g. focal point in HIFU transducers), detection of acoustic beam-profile irregularities (e.g. due to defects in transducer) and on-line identification of time-dependent phenomena [2] (e.g. in phased array transducers).
A typical radiation pattern of phased arrays whose inter-element spacing is greater than half a wavelength, hence the radiation pattern has grating lobes.. For discrete aperture antennas (such as phased arrays) in which the element spacing is greater than a half wavelength, a spatial aliasing effect allows plane waves incident to the array from visible angles other than the desired direction ...
3-D imaging requires a 2-D array transducer in which the number of elements can be ten times more than the linear 1-D array transducer. Moreover, the number of scanlines required in a 3-D volume is at least one order of magnitude higher than in a 2-D image in order to form the volumetric display. To reduce the computational complexities ...
There are several ways to focus ultrasound—via a lens (for example, a polystyrene lens, parabola curve transducer, a phased array, etc. The special patents and very precise technology solve the problem. This can be determined using an exponential model of ultrasound attenuation. The ultrasound intensity profile is bounded by an exponentially ...
Achieva MR system to monitor the procedure and provide real-time images; MR-HIFU patient tabletop with integrated MR compatible high power phased array transducer with mechanical and electronic positioning; MR-HIFU therapy console to plan treatment, calculate real-time temperature maps, and control HIFU delivery