Scholars@Duke
Pengfei Song

Pengfei Song

Associate Professor of Biomedical Engineering
Biomedical Engineering
1427 Fitzpatrick Center, Box 90281, Durham, NC 27708

Scholarly Works - Conferences

Notice of Removal: Fast and robust spatiotemporal microvessel clutter filtering with randomized singular value decomposition (rSVD) and randomized spatial downsampling

Conference IEEE International Ultrasonics Symposium Ius · October 31, 2017 Singular value decomposition (SVD)-based clutter filtering has demonstrated superior clutter rejection performance in the emerging field of ultrasound microvessel imaging. To alleviate the computational burden of SVD, here we present a fast and robust clut ... Full text Cite

A model-free approach to probe motion artifacts suppression for in vivo imaging with probe oscillation shear wave elastography (PROSE)

Conference IEEE International Ultrasonics Symposium Ius · October 31, 2017 Probe oscillation shear wave elastography (PROSE) can achieve high frame-rate two-dimensional (2D) shear wave elastography by utilizing a continuously vibrating ultrasound probe to simultaneously generate and detect shear waves (Mellema, IEEE TMI 0278-0062 ... Full text Cite

Delay-encoded harmonic imaging (DE-HI) in multiplane-wave compounding

Conference IEEE International Ultrasonics Symposium Ius · October 31, 2017 The development of ultrafast ultrasound imaging brings great opportunities to improve imaging technologies such as shear wave elastography and ultrafast Doppler imaging. In ultrafast imaging, there are trade-offs among image signal-to-noise ratio (SNR), re ... Full text Cite

Notice of Removal: Robust ultrasound super-resolution microvessel imaging with spatiotemporal nonlocal means filtering and bipartite graph-based microbubble tracking

Conference IEEE International Ultrasonics Symposium Ius · October 31, 2017 Recently multiple studies have demonstrated microbubble (MB)-based super-resolution imaging (SRI) with ∼λ/10 subwavelength resolution on mice and rats. Clinical translation of SRI, however, faces many technical challenges such as low signal-to-noise-ratio ... Full text Cite

Delay-encoded harmonic imaging (DE-HI) in multiplane-wave compounding

Conference IEEE International Ultrasonics Symposium Ius · October 31, 2017 Ultrafast ultrasound imaging offers great opportunities to new imaging technologies such as shear wave elastography and ultrafast Doppler. Multiplane wave (MW) imaging is a new technique in which multiple positively or negatively encoded plane waves are em ... Full text Cite

Hadamard-encoded multi-pulses for contrast-enhanced ultrasound imaging

Conference IEEE International Ultrasonics Symposium Ius · October 31, 2017 The development of contrast-enhanced ultrasound (CEUS) imaging has great potential for use in new ultrasound clinical applications such as myocardial perfusion imaging and abdominal lesion characterization. In CEUS imaging, the contrast agents (i.e., micro ... Full text Cite

Improved contrast-enhanced ultrasound imaging with multiplane wave imaging

Conference IEEE International Ultrasonics Symposium Ius · October 31, 2017 Contrast enhanced ultrasound (CEUS) imaging offers great opportunities for new ultrasound applications by improving the contrast between blood and tissue using microbubbles. However, the low signal-to-noise ratio (SNR) due to the low mechanical index (MI) ... Full text Cite

Improved contrast-enhanced ultrasound imaging with multiplane wave imaging

Conference IEEE International Ultrasonics Symposium Ius · October 31, 2017 Contrast-enhanced ultrasound (CEUS) imaging offers great opportunities for new ultrasound applications by improving the contrast between blood and tissue using microbubbles. However, the low signal-to-noise ratio (SNR) due to the low mechanical index (MI) ... Full text Cite

Hadamard encoded multi-pulses for contrast enhanced ultrasound imaging

Conference IEEE International Ultrasonics Symposium Ius · October 31, 2017 Contrast enhanced ultrasound (CEUS) imaging is widely used in clinic to enhance blood flow signal using microbubbles (MBs). In conventional CEUS methods such as pulse inversion (PI), amplitude modulation (AM), and pulse inversion amplitude modulation (PIAM ... Full text Cite

Notice of Removal: Singular value decomposition-based noise equalization for ultrafast plane wave microvessel imaging

Conference IEEE International Ultrasonics Symposium Ius · October 31, 2017 Ultrafast plane wave microvessel imaging significantly improves ultrasound Doppler sensitivity. The rich spatiotemporal plane wave data enables robust clutter filtering based on singular value decomposition (SVD). However, due to the lack of transmit focus ... Full text Cite

Advanced ultrafast imaging with synthetic transmit aperture (USTA) imaging

Conference 2016 IEEE International Ultrasonics Symposium (IUS) · September 2016 Full text Cite

RSNA QIBA ultrasound shear wave speed Phase II phantom study in viscoelastic media

Conference 2015 IEEE International Ultrasonics Symposium Ius 2015 · November 13, 2015 Using ultrasonic shear wave speed (SWS) estimates has become popular to noninvasively evaluate liver fibrosis, but significant inter-system variability in liver SWS measurements can preclude meaningful comparison of measurements performed with different sy ... Full text Cite

A systematic investigation of feasible acoustic windows and the impact of myocardial anisotropy for in vivo human cardiac shear wave elastography

Conference 2015 IEEE International Ultrasonics Symposium Ius 2015 · November 13, 2015 Recent advancement in cardiac shear wave elastography (SWE) using pulse-inversion harmonic imaging showed substantial improvement of shear wave motion detection and demonstrated feasibility of transthoracic measurement of human myocardial stiffness. This s ... Full text Cite

In vivo liver shear wave motion detection and shear wave speed comparison between fundamental and harmonic imaging

Conference 2015 IEEE International Ultrasonics Symposium Ius 2015 · November 13, 2015 Quantification of liver elasticity is a major application of shear wave elasticity imaging (SWEI) to non-invasively assess liver fibrosis stages. SWEI measurements can be highly affected by ultrasound image quality. Ultrasound harmonic imaging has shown a ... Full text Cite

Implementation of shear wave elastography on pediatric cardiac transducers with pulse-inversion harmonic imaging and time-aligned sequential tracking

Conference 2015 IEEE International Ultrasonics Symposium Ius 2015 · November 13, 2015 Monitoring myocardial stiffness changes with shear wave elastography (SWE) has promising potential for assessing chemotherapy-induced cardiotoxicity for pediatric cancer patients. While ultrasound B-scan with adult cardiac probes on children is commonly ac ... Full text Cite

A high frame-rate and low-cost Elastography system by generating shear waves through continuous vibration of the ultrasound transducer

Conference 2015 IEEE International Ultrasonics Symposium Ius 2015 · November 13, 2015 Ultrasound shear wave elastography (SWE) utilizes the propagation of induced shear waves to characterize the shear modulus of soft tissue. Many methods rely on an acoustic radiation force (ARF) push beam to generate shear waves. However, specialized hardwa ... Full text Cite

Investigation of the effects of myocardial anisotropy for shear wave elastography using acoustic radiation force and harmonic vibration

Conference 2015 IEEE International Ultrasonics Symposium Ius 2015 · November 13, 2015 Shear wave elastography with acoustic radiation force (ARF) or harmonic vibration (HV) has been applied in animals and humans to evaluate myocardial material properties. The anisotropic myocardial structure presents a unique challenge to wave propagation m ... Full text Cite

Dual-frequency shear wave motion detection

Conference IEEE International Ultrasonics Symposium Ius · October 20, 2014 Shear wave motion detection is a critical part of ultrasound shear wave elastography (SWE). Shear wave signal-to-noise-ratio (SNR) is strongly related to the ultrasound RF (radiofrequency) signal SNR. Recently, we demonstrated substantial improvement of sh ... Full text Cite

In vivo transthoracic measurement of end-diastolic left ventricular stiffness with ultrasound shear wave elastography: A pilot study

Conference IEEE International Ultrasonics Symposium Ius · October 20, 2014 End-diastolic left ventricular (EDLV) stiffness is a strong biomarker of diastolic heart failure (DHF). Ultrasound shear wave elastography (SWE) can provide a quantitative and noninvasive measure of myocardial stiffness, which makes SWE a promising tool fo ... Full text Cite

Comb-Push Ultrasound Shear Elastography of thyroid: Preliminary in vivo human study

Conference IEEE International Ultrasonics Symposium Ius · October 20, 2014 Shear wave elastography (SWE) techniques have been introduced and have shown promising potency in providing diagnostic information about thyroid nodules. Comb-push Ultrasound Shear Elastography (CUSE) has been recently introduced as a technique that is cap ... Full text Cite

Liver elasticity imaging using external Vibration Multi-directional Ultrasound Shearwave Elastography (EVMUSE)

Conference IEEE International Ultrasonics Symposium Ius · October 20, 2014 Shear wave speed can be used to assess tissue elasticity, which is associated with tissue health. Ultrasound shear wave elastography techniques based on measuring the propagation speed of the shear waves induced by acoustic radiation force are becoming pro ... Full text Cite

Shear wave generation with steered ultrasound push beams

Conference IEEE International Ultrasonics Symposium Ius · October 20, 2014 Elasticity imaging is becoming established as a means of assisting in diagnosis of certain diseases. Shear wave-based methods have been developed to perform elasticity measurements in soft tissue. We propose a novel method that uses steered push beams (SPB ... Full text Cite

Shear wave elastography on the GE LOGIQ E9 with Comb-push Ultrasound Shear Elastography (CUSE) and time aligned sequential tracking (TAST)

Conference IEEE International Ultrasonics Symposium Ius · October 20, 2014 Two-dimensional (2D) shear wave elastography has emerged as a popular clinical and research tool for a variety of applications. Implementing 2D shear wave elastography on a conventional ultrasound scanner, however, is a challenging task due to the low imag ... Full text Cite

RSNA/QIBA: Shear wave speed as a biomarker for liver fibrosis staging

Conference IEEE International Ultrasonics Symposium Ius · December 1, 2013 An interlaboratory study of shear wave speed (SWS) estimation was performed. Commercial shear wave elastography systems from Fibroscan, Philips, Siemens and Supersonic Imagine, as well as several custom laboratory systems, were involved. Fifteen sites were ... Full text Cite

Two-dimensional shear elasticity imaging using external mechanical vibration

Conference IEEE International Ultrasonics Symposium Ius · December 1, 2013 Compared to ultrasound radiation force, mechanical vibration is capable of delivering larger motion into deep tissues. However, the propagation direction of the shear waves generated by such method can be complicated and unpredictable, which make it diffic ... Full text Cite

Fast shear compounding using directional filtering and two-dimensional shear wave speed calculation

Conference IEEE International Ultrasonics Symposium Ius · December 1, 2013 Shear compounding illuminates the shear wave imaging field with differently angled shear waves from which elasticity maps can be reconstructed and compounded to increase SNR and contrast. However, the shear imaging frame rate may be reduced by the need for ... Full text Cite

A phantom study to cross-validate multimodality shear wave elastography techniques

Conference IEEE International Ultrasonics Symposium Ius · December 1, 2012 As various quantitative shear wave elastography techniques are being implemented commercially and used clinically, it is important to understand what elastic modulus is measured by those techniques and to assess technical factors influencing measurement ac ... Full text Cite

Shear wave speed measurement using repeated short push pulses

Conference IEEE International Ultrasonics Symposium Ius · December 1, 2012 Measurement of shear wave propagation speed in tissues has clinical significance of indicating tissue stiffness and health state. Shear waves are usually produced by a high voltage, long duration ultrasound push beam. Many ultrasound scanners cannot produc ... Full text Cite

Measure elasticity and viscosity using the out-of-plane shear wave

Conference IEEE International Ultrasonics Symposium Ius · December 1, 2012 Tissue elasticity μ1 and viscosity μ2 can be estimated by evaluating dispersion of shear wave propagation velocity over a range of frequencies. Alternatively, μ1 and μ2 can be calculated from shear wave attenuati ... Full text Cite

Comb-push Ultrasound Shear Elastography (CUSE): A novel and fast technique for shear elasticity imaging

Conference IEEE International Ultrasonics Symposium Ius · December 1, 2012 Multiple push-detect acquisitions are typically required in current acoustic radiation force based shear wave elasticity imaging methods to reconstruct a full FOV elasticity map, which can result in potential motion artifacts and difficulties in studying t ... Full text Cite

Robust shear wave speed measurement using comb-push ultrasound radiation force

Conference IEEE International Ultrasonics Symposium Ius · December 1, 2011 Measurement of shear wave propagation speed in tissues has clinical significance of indicating tissue stiffness and health state. Spatially Modulated Ultrasound Radiation Force (SMURF) imaging generates a shear wave of known wavelength in the tested materi ... Full text Cite

Shear wave speed measurements using ultrasound radiation force can be depth dependent

Conference IEEE International Ultrasonics Symposium Ius · December 1, 2011 Measurement of shear wave propagation speed has important clinical applications because it is related to tissue stiffness and health state. Shear waves can be generated in tissue by the radiation force of a focused ultrasound beam (push beam). Shear wave s ... Full text Cite

Shear wave speed measurement using an unfocused ultrasound push beam

Conference IEEE International Ultrasonics Symposium Ius · December 1, 2011 Tissue viscoelasticity is related to pathology and therefore has important medical applications. Radiation force from a focused ultrasound beam has been used to produce shear wave in tissues for shear wave speed and tissue elasticity measurements. The feas ... Full text Cite

Tendinopathy discrimination using spatial frequency parameters and artificial neural networks

Conference Proceedings IEEE Ultrasonics Symposium · January 1, 2009 Healthy tendon's structural characteristics are related to the anisotropic speckle pattern observed in ultrasound images. This speckle orientation is disrupted upon damage to the tendon structure as observed in patients with tendinopathy. Quantification of ... Full text Cite

Automatic skeletonization for 3D hepatic portal vein in CT angiography

Conference IEEE Nuclear Science Symposium Conference Record · December 1, 2008 The analysis of Hepatic Portal Vein (HPV) is important in liver surgical planning and diseases diagnosis, such as living-related liver transplant and oncologic resections. Skeletonization is always the necessary way for vasculature quantification analysis. ... Full text Cite