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Non-diffraction waves have great importance in medical imaging, especially the Bessel beams. In order to obtain a spatial ultrasound field of Bessel beams, this paper simulated with the use of a circular ultrasonic transducer and a set of concentric annular ultrasonic transducers and compared the simulation results. The results help to find out applied ways of zero-order Bessel ultrasonic field for...
Broadband ultrasound attenuation (BUA) is a useful predictor of the mechanical properties of cancellous bone. It is obtained by ultrasound pulse wave through-transmission measurements into the bone. Due to the strong attenuation in the bone, the received signal is weak and intervened with noise, which confines the measured depth and brings estimation errors. An effective solution to this is the coded...
The high frame rate (HFR) ultrasonic imaging system based on linear frequency-modulated (LFM) signal constructs images at a high frame rate and the signal-to-noise rate (SNR) of this system can also be improved. Unfortunately, such pulse compression methods that increase the SNR usually cause range sidelobe artifacts. In an imaging situation, the effects of the sidelobes extending on either side of...
In traditional synthetic aperture ultrasound imaging system, the elements in a transducer array transmit ultrasound pulse consecutively and then all elements receive the echo signals simultaneously. Though it is capable of obtain an complete dataset of the echoes, the process is very slow and thus not practical due to too many transmission times. We developed an simultaneously transmitting approach...
The high frame rate (HFR) ultrasonic imaging system, which is developed with limited diffraction beams, constructs images at a high frame rate. Because of one transmission for constructing image, the system suffers from lower signal-to-noise rate (SNR). The proposed method uses linear frequency-modulated signal (or chirp) as excited signal. For the higher time-bandwidth (TB) products available in...
A kind of high frame rate (HFR) 2D and 3D imaging method was developed in 1997. Because only one transmission is required to construct an image, this method can reach an ultra high frame rate (about 3750 volumes or frames per second for biological soft tissues at a depth of 200 mm). Compared with conventional delay-and-sum (dynamic focusing) method, the new method uses the fast Fourier transform (FFT)...
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