Coded excitation for ultrasound tissue harmonic imaging

Song, Jaeki; Kim, Sangwon; Sohn, Hak-yeol; Song, Tai-Kyong; Yoo, Yangmo

doi:10.1016/j.ultras.2010.01.001

Cited by 59 publications

(31 citation statements)

References 14 publications

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“…[10,11] Propagation from one plane to another may be accomplished through use of a transfer function H.…”

Section: Frequency Domain Solutionmentioning

confidence: 99%

“…For this, coded excitations can be used, which have been used earlier for second harmonic imaging and have shown improved SNR. Coded excitation using frequency modulated signals (chirps) have previously shown promising results in vitro [8] and in vivo [9] for fundamental [9] and second harmonic [10] imaging. It has been concluded that linear frequency modulation (FM) chirps significantly improve penetration depth and image quality as well.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Superharmonic Imaging Using Chirp Excitation

Londhe

Anand

2011

Journal of Medical Ultrasound

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KEY WORDS chirp, harmonic, imaging, superharmonic, ultrasound At present, along with the fundamental method of ultrasound imaging, tissue harmonic imaging based on imprinting of the second harmonic component is established as the standard method of ultrasound imaging. Recently introduced superharmonic imaging (SHI) has an edge over this standard method and has improved spatial resolution. To explore further advancement in ultrasound imaging for enhanced resolution and penetration depth. SHI is the summation of higher harmonics generated due to nonlinear tissue propagation of ultrasound. Here, the addition of third, fourth and fifth harmonics has been done for the superharmonic field. The modeling of nonlinear wave propagation is done in frequency domain on the basis of the second order operator splitting approach. The higher harmonic components are picked up using the inverse filters. The standard evaluation parameters were significantly improved with linear frequency modulation (FM) chirp. The axial level was 2.8 times higher with linear FM chirp as compared to conventional short pulse. Minor benefits such as a 5% increase in beam width and suppression of side lobes were also recorded. This numerical investigation confirms that linear FM chirp in SHI provides better resolution and penetration depth. State of the art fundamental and second harmonic ultrasound imaging techniques were also improved with linear FM chirp as compared with conventional excitation. SHI is superior to the existing diagnostic ultrasound techniques. ª

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“…[10,11] Propagation from one plane to another may be accomplished through use of a transfer function H.…”

Section: Frequency Domain Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Superharmonic Imaging Using Chirp Excitation

Londhe

Anand

2011

Journal of Medical Ultrasound

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“…The coded excitation method is generally utilized to increase the signal-to-noise ratio of echo signals. However, this method also requires low-harmonic signal distortion to prevent spectral overlap [18].…”

Section: Introductionmentioning

confidence: 99%

A Wideband High-Voltage Power Amplifier Post-Linearizer for Medical Ultrasound Transducers

2017

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Abstract:The medical ultrasound transducer is a principal component in ultrasound systems, as it significantly influences system performance. The high-voltage power amplifier (HVPA) is the key ultrasound transmitter component and interfaces with the medical ultrasound transducer. Therefore, the performance of the HVPA critically affects the echo signal quality of the ultrasound transducer. As they are inherently non-linear devices, harmonic distortion of echo signals generated by the ultrasound transducers would critically deteriorate the echo signal quality in ultrasound systems. The primary aim of this research is to integrate a novel post-linearizer into the HVPA to suppress harmonic distortion in medical ultrasound transducers. Moreover, this study is based on the assumption that linearizing the HVPA could reduce the harmonic distortion components of the echo signals. The developed HVPA with post-linearizer was tested in an ultrasound microscopy system in order to demonstrate the harmonic suppression capability on the echo signal generated by the ultrasound transducer. When 10 MHz, 5-cycle, 26 dB m input power was sent to the HVPA with and without the post-linearizer circuits, the measured second-, third-, fourth-and fifth-harmonic distortions of a 10 MHz transducer with the post-linearizer (−13.11 dB, −10.81 dB, −16.33 dB, and −22.78 dB) were suppressed to a greater degree than those of the same transducer without the post-linearizer (−4.58 dB, −8.87 dB, −10.51 dB, and −15.31 dB).. Therefore, we conclude that the addition of the post-linearizer to the HVPA is a potentially useful electronic technique for improving echo signal quality in medical ultrasound transducers.

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“…For this, coded excitations can be used, which have been used earlier for second harmonic imaging and have shown improved SNR. Coded excitation using frequency modulated (FM) signals (chirps) have previously shown promising results in vitro [7] and in vivo [8] for fundamental imaging [8] and second harmonic imaging (THI) [9].…”

Section: Introductionmentioning

confidence: 99%

Coded Tissue Superharmonic Imaging: An Analytical Study

Londhe

Anand

2012

Journal of Medical Ultrasound

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Superharmonic imaging (SHI) benefits medical ultrasound imaging in achieving higher spatial and contrast resolution but gives poor signal-to-noise ratio (SNR) and penetration depth that require careful control on excitation power and frequency. In the present work, coded pulsed excitations (linear frequency modulated and nonlinear frequency modulated signals) are used to evaluate the superharmonic field generation and propagation (coded tissue superharmonic imaging). The evaluation includes the study of parameters such as peak side lobe level, beam width, axial level for analyzing SNR and penetration depth. The results for coded tissue SHI are reported in comparison with conventional SHI and with the performance of coded tissue harmonic imaging and fundamental ultrasound imaging. ª

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Coded excitation for ultrasound tissue harmonic imaging

Cited by 59 publications

References 14 publications

Numerical Investigation of Superharmonic Imaging Using Chirp Excitation

Numerical Investigation of Superharmonic Imaging Using Chirp Excitation

A Wideband High-Voltage Power Amplifier Post-Linearizer for Medical Ultrasound Transducers

Coded Tissue Superharmonic Imaging: An Analytical Study

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