A post-compression based ultrasound imaging technique for simultaneous transmit multi-zone focusing

Kim, Bae-Hyung; Kim, Gi-Duck; Song, Tai-Kyong

doi:10.1016/j.ultras.2007.01.007

Cited by 15 publications

(7 citation statements)

References 22 publications

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“…Moreover, for a central frequency of 2.0 MHz, the corresponding central wavelength Coded excitation has been shown to improve the penetration, signal-to-noise ratio, as well as the frame rate for ultrasound imaging. In terms of increasing frame rate, it has been proposed to suppress crosstalk in many applications [15][16][17][18][19][20][21] by using simultaneous transmission, of two or more orthogonal transmit pulses whose mutual cross-correlation is very small. When simultaneously transmitting two or more such mutually orthogonal codes, the received signals contain information from all codes.…”

Section: Methodsmentioning

confidence: 99%

“…However, for chirps, the transmission of complementary codes is not necessary, and so the frame rate would be compromised. Both orthogonal Golay and chirp codes have been proposed for crosstalk reduction in increasing frame rate for synthetic aperture imaging with multiple transmit positions [15,17] and in maintaining frame rate for multi-zone focusing by simultaneous transmissions for linear [16][17][18][19]22] and convex array imaging [20,21]. However, towards phased array based high frame rate cardiac imaging, it has not been revealed yet that the feasibility of using these orthogonal codes to (further) reduce crosstalk among focused MLT beams.…”

Section: Appl Sci 2018 8 X 2 Of 16mentioning

confidence: 99%

“…On this probe, two types of orthogonal coded excitations, i.e., one set of orthogonal Golay codes and one set of orthogonal linear frequency (FM) modulated chirps were tested since they have already been proposed for other purposes in ultrasound imaging [12][13][14][15][16][17][18][19] and are relatively simple to implement. In particular, the following Golay codes were used to obtain good orthogonal property without largely elongating the excitation duration: where G1 is complementary to G1c, G2 is complementary to G2c, the pair of G1 and G1c are orthogonal to the pair of G2 and G2c.…”

Section: Orthogonal Coded Excitationsmentioning

confidence: 99%

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Coded Excitation for Crosstalk Suppression in Multi-line Transmit Beamforming: Simulation Study and Experimental Validation

Tong

Ortega

et al. 2019

Applied Sciences

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(1) Background: Multi-line transmit (MLT) beamforming has been proposed for fast cardiac ultrasound imaging. While crosstalk between MLT beams could induce artifacts, a Tukey (α = 0.5)-Tukey (α = 0.5) transmit-receive (TT-) apodization can largely—but not completely—suppress this crosstalk. Coded excitation has been proposed for crosstalk suppression, but only for synthetic aperture imaging and multi-focal imaging on linear/convex arrays. The aim of this study was to investigate its (added) value to suppress crosstalk among simultaneously transmitted multi-directional focused beams on a phased array; (2) Methods: One set of two orthogonal Golay codes, as well as one set of two orthogonal chirps, were applied on a two, four, and 6MTL imaging schemes individually. These coded schemes were investigated without and with TT-apodization by both simulation and experiments; and (3) Results: For a 2MLT scheme, without apodization the crosstalk was removed completely using Golay codes, whereas it was only slightly suppressed by chirps. For coded 4MLT and 6MLT schemes, without apodization crosstalk appeared as that of non-apodized 2MLT and 3MLT schemes. TT-apodization was required to suppress the remaining crosstalk. Furthermore, the coded MLT schemes showed better SNR and penetration compared to that of the non-coded ones. (4) Conclusions: The added value of orthogonal coded excitation on MLT crosstalk suppression remains limited, although it could maintain a better SNR.

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Section: Methodsmentioning

confidence: 99%

Section: Appl Sci 2018 8 X 2 Of 16mentioning

confidence: 99%

Section: Orthogonal Coded Excitationsmentioning

confidence: 99%

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Coded Excitation for Crosstalk Suppression in Multi-line Transmit Beamforming: Simulation Study and Experimental Validation

Tong

Ortega

et al. 2019

Applied Sciences

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“…In practical implementations, hardware costs can be reduced significantly using post-compression, i.e., reversing the order of these operations. This introduces an error that depends on a range of factors including focal depth, signal length, the distance between focal points [8] and the f-number used [18].…”

Section: B Receive Processingmentioning

confidence: 99%

Segmented motion compensation for complementary coded ultrasonic imaging

Cannon

Hannah

McLaughlin

2010

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Ultrasonic imaging using complementary coded pulses offers the SNR improvements of signal coding without the filter side-lobes introduced by single-transmit codes. Tissue motion between coded pulse emissions, however, can introduce high side-lobes caused by misalignment of complementary filter outputs. This paper presents a method for filtering and motion compensation of complementary coded signals appropriate for use in medical imaging. The method is robust to the effects of non-ideal transducers on the imaging signals, includes mirrored compensation stages to reduce the impact of motion estimation error, and has been shown to reduce side-lobes to levels that compare favorably to systems using FM-coded signals of similar length and bandwidth while providing increased coding gain and range resolution. In addition, motion compensation allows the received data to be used without the frame-rate penalty usually incurred by complementary-coded imaging. The method has been verified using simulated point and speckle targets with both homogeneous and inhomogeneous motion profiles. Selected results have been verified experimentally.

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“…The average transmitted power increases proportionally to the length of the code. There are several papers in literature concerning a similar boundarycondition problem of signal compression in medical diagnostic imaging (Kim et al, 2007;Klimonda et al, 2005;Liu, Insana, 2005;Nowicki et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Mutually Orthogonal Golay Complementary Sequences in Synthetic Aperture Imaging Systems

Trots¹

2015

Archives of Acoustics

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The main objective of this study is to improve the ultrasound image by employing a new algorithm based on transducer array element beam pattern correction implemented in the synthetic transmit aperture (STA) method combined with emission of mutually orthogonal complementary Golay sequences. Orthogonal Golay sequences can be transmitted and received by different transducer elements simultaneously, thereby decreasing the time of image reconstruction, which plays an important role in medical diagnostic imaging.The paper presents the preliminary results of computer simulation of the synthetic aperture method combined with the orthogonal Golay sequences in a linear transducer array. The transmission of long waveforms characterized by a particular autocorrelation function allows to increase the total energy of the transmitted signal without increasing the peak pressure. It can also improve the signal-to-noise ratio and increase the visualization depth maintaining the ultrasound image resolution.In the work, the 128-element linear transducer array with a 0.3 mm pitch excited by 8-bits Golay coded sequences as well as one cycle at nominal frequencies of 4 MHz were used. The comparison of 2D ultrasound images of the phantoms is presented to demonstrate the benefits of a coded transmission. The image reconstruction was performed using the synthetic STA algorithm with transmit and receive signals correction based on a single element directivity function.

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A post-compression based ultrasound imaging technique for simultaneous transmit multi-zone focusing

Cited by 15 publications

References 22 publications

Coded Excitation for Crosstalk Suppression in Multi-line Transmit Beamforming: Simulation Study and Experimental Validation

Coded Excitation for Crosstalk Suppression in Multi-line Transmit Beamforming: Simulation Study and Experimental Validation

Segmented motion compensation for complementary coded ultrasonic imaging

Mutually Orthogonal Golay Complementary Sequences in Synthetic Aperture Imaging Systems

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