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Oh D, Lee D, Heo J, Kweon J, Yong U, Jang J, Ahn YJ, Kim C. Contrast Agent-Free 3D Renal Ultrafast Doppler Imaging Reveals Vascular Dysfunction in Acute and Diabetic Kidney Diseases. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2303966. [PMID: 37847902 PMCID: PMC10754092 DOI: 10.1002/advs.202303966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 08/19/2023] [Indexed: 10/19/2023]
Abstract
To combat the irreversible decline in renal function associated with kidney disease, it is essential to establish non-invasive biomarkers for assessing renal microcirculation. However, the limited resolution and/or vascular sensitivity of existing diagnostic imaging techniques hinders the visualization of complex cortical vessels. Here, a 3D renal ultrafast Doppler (UFD) imaging system that uses a high ultrasound frequency (18 MHz) and ultrahigh frame rate (1 KHz per slice) to scan the entire volume of a rat's kidney in vivo is demonstrated. The system, which can visualize the full 3D renal vascular branching pyramid at a resolution of 167 µm without any contrast agent, is used to chronically and noninvasively monitor kidneys with acute kidney injury (AKI, 3 days) and diabetic kidney disease (DKD, 8 weeks). Multiparametric UFD analyses (e.g., vessel volume occupancy (VVO), fractional moving blood volume (FMBV), vessel number density (VND), and vessel tortuosity (VT)) describe rapid vascular rarefaction from AKI and long-term vascular degeneration from DKD, while the renal pathogeneses are validated by in vitro blood serum testing and stained histopathology. This work demonstrates the potential of 3D renal UFD to offer valuable insights into assessing kidney perfusion levels for future research in diabetes and kidney transplantation.
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Affiliation(s)
- Donghyeon Oh
- Departments of Electrical EngineeringConvergence IT EngineeringMedical Science and EngineeringMechanical Engineeringand Medical Device Innovation CenterPohang University of Science and Technology (POSTECH)Cheongam‐ro 77, Nam‐guPohangGyeongbuk37673Republic of Korea
| | - Donghyun Lee
- Departments of Electrical EngineeringConvergence IT EngineeringMedical Science and EngineeringMechanical Engineeringand Medical Device Innovation CenterPohang University of Science and Technology (POSTECH)Cheongam‐ro 77, Nam‐guPohangGyeongbuk37673Republic of Korea
| | - Jinseok Heo
- Departments of Electrical EngineeringConvergence IT EngineeringMedical Science and EngineeringMechanical Engineeringand Medical Device Innovation CenterPohang University of Science and Technology (POSTECH)Cheongam‐ro 77, Nam‐guPohangGyeongbuk37673Republic of Korea
| | - Jooyoung Kweon
- Departments of Electrical EngineeringConvergence IT EngineeringMedical Science and EngineeringMechanical Engineeringand Medical Device Innovation CenterPohang University of Science and Technology (POSTECH)Cheongam‐ro 77, Nam‐guPohangGyeongbuk37673Republic of Korea
| | - Uijung Yong
- Departments of Electrical EngineeringConvergence IT EngineeringMedical Science and EngineeringMechanical Engineeringand Medical Device Innovation CenterPohang University of Science and Technology (POSTECH)Cheongam‐ro 77, Nam‐guPohangGyeongbuk37673Republic of Korea
| | - Jinah Jang
- Departments of Electrical EngineeringConvergence IT EngineeringMedical Science and EngineeringMechanical Engineeringand Medical Device Innovation CenterPohang University of Science and Technology (POSTECH)Cheongam‐ro 77, Nam‐guPohangGyeongbuk37673Republic of Korea
| | - Yong Joo Ahn
- Departments of Electrical EngineeringConvergence IT EngineeringMedical Science and EngineeringMechanical Engineeringand Medical Device Innovation CenterPohang University of Science and Technology (POSTECH)Cheongam‐ro 77, Nam‐guPohangGyeongbuk37673Republic of Korea
| | - Chulhong Kim
- Departments of Electrical EngineeringConvergence IT EngineeringMedical Science and EngineeringMechanical Engineeringand Medical Device Innovation CenterPohang University of Science and Technology (POSTECH)Cheongam‐ro 77, Nam‐guPohangGyeongbuk37673Republic of Korea
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Paridar R, Asl BM. Ultrafast Plane Wave Imaging Using Tensor Completion-Based Minimum Variance Algorithm. ULTRASOUND IN MEDICINE & BIOLOGY 2023; 49:1627-1637. [PMID: 37087375 DOI: 10.1016/j.ultrasmedbio.2023.03.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Revised: 03/15/2023] [Accepted: 03/18/2023] [Indexed: 05/03/2023]
Abstract
OBJECTIVE Coherent plane wave compounding (CPWC) imaging is an efficient technique in high-frame-rate ultrasound imaging. To improve the image quality obtained from the CPWC, the adaptive minimum variance (MV) algorithm can be used. However, the high computational complexity of this algorithm negatively affects the frame rate. In other words, achieving a high frame rate and high-quality features simultaneously remains a challenge in medical ultrasound imaging. The aim of the work described here was to develop an algorithm to tackle this challenge and improve the frame rate while preserving the good quality of the resulting image. METHODS A tensor completion (TC)-based MV algorithm is proposed to simultaneously improve the frame rate and image quality in CPWC. In the proposed method, the MV algorithm is applied to a limited number of pixels in the beamforming grid. Then, the appropriate values are assigned to the remaining unprocessed pixels by using the TC algorithm. The proposed algorithm speeds up the beamforming process, and consequently, improves the frame rate. RESULTS The computational complexity of the proposed TC-based MV algorithm is reduced compared with that of the conventional MV algorithm while the good quality of this algorithm is preserved. The results indicate that, in particular, by processing 40% of the beamforming grid using the MV beamformer followed by the TC algorithm, a reconstructed image comparable to that in the case in which the MV algorithm is performed on the full beamforming grid is obtained; the difference between the contrast-to-noise ratio evaluation metric between these two cases is about 0.16 dB for the experimental-resolution phantom. Also, the resulting images obtained from the MV algorithm and the TC-based MV method have the same resolution, indicating that the TC-based MV algorithm can successfully achieve the quality of the MV algorithm with a lower computational complexity. CONCLUSION The TC-based MV algorithm is proposed in CPWC with the goal of improving frame rate and image quality. Qualitative and quantitative results reveal that by use of the proposed algorithm, the quality of the reconstructed image will be comparable to that of the conventional MV algorithm, and the frame rate will be improved.
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Affiliation(s)
- Roya Paridar
- Department of Biomedical Engineering, Tarbiat Modares University, Tehran, Iran
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Bhatti A, Ishii T, Kanno N, Ikeda H, Funamoto K, Saijo Y. Region-based SVD processing of high-frequency ultrafast ultrasound to visualize cutaneous vascular networks. ULTRASONICS 2023; 129:106907. [PMID: 36495767 DOI: 10.1016/j.ultras.2022.106907] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 10/24/2022] [Accepted: 11/27/2022] [Indexed: 06/17/2023]
Abstract
Observing alterations in cutaneous vasculature in response to any disease or pathology is considered as a potential diagnostic marker in the progression and cure of a disease. To observe skin morphologies and tissue conditions, high-frequency ultrasound (HFUS) has been used in dermatology, although its ability to selectively visualize micro-vessels is limited due to insufficient Doppler sensitivity to peripheral slow-speed blood flow. In recent studies, this issue has been improved by increasing the sensitivity of Doppler imaging to slow flow, leveraging advanced cutter filtering approaches based on singular value decomposition (SVD) techniques that aid to effectively extract flow signals overlapped with tissue echo signals. Nevertheless, in skin imaging, variations in flow speed, diameter, and depth of the blood vessels at different skin layers can make clutter filtering challenging because these variations are problematic in selecting the optimal cut-off value for the SVD filtering. In this study, we aimed to devise a novel region-based SVD filtering approach for ultrafast HFUS data to visualize cutaneous vascular networks. The proposed method divides the acquired high-framerate data into two regions based on B-mode cutaneous morphological identification (dermis layer and subcutaneous tissue). Singular value decomposition processing was performed on each region to effectively extract the desired flow signal, and the processed regions were merged to generate a single power Doppler image, thereby highlighting the appearance of a complete cutaneous vascular network. Finally, top-hat transform was applied to the power Doppler image to further suppress the background noises and enhances the visibility of the micro-vessels. Experimental observations of the human cutaneous circulation showed that the image quality (contrast-to-noise ratio) through the region-based SVD filtering was measured to be 4.1 dB (before top-hat filtering) and 5.2 dB (after top-hat filtering), which were improved from 3.4 dB and 4.0 dB obtained using the global SVD approach with and without top-hat filtering, respectively. We envisioned that this approach would provide diverse applications in the diagnosis of cutaneous disorders.
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Affiliation(s)
- Anam Bhatti
- Graduate School of Biomedical Engineering, Tohoku University, Sendai 980-8579, Miyagi, Japan
| | - Takuro Ishii
- Graduate School of Biomedical Engineering, Tohoku University, Sendai 980-8579, Miyagi, Japan; Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-0845, Miyagi, Japan.
| | - Naoya Kanno
- Graduate School of Biomedical Engineering, Tohoku University, Sendai 980-8579, Miyagi, Japan
| | - Hayato Ikeda
- Graduate School of Biomedical Engineering, Tohoku University, Sendai 980-8579, Miyagi, Japan
| | - Kenichi Funamoto
- Institute of Fluid Science, Tohoku University, Sendai 980-8577, Miyagi, Japan
| | - Yoshifumi Saijo
- Graduate School of Biomedical Engineering, Tohoku University, Sendai 980-8579, Miyagi, Japan
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Shen CC, Guo FT. Ultrasound Ultrafast Power Doppler Imaging with High Signal-to-Noise Ratio by Temporal Multiply-and-Sum (TMAS) Autocorrelation. SENSORS (BASEL, SWITZERLAND) 2022; 22:8349. [PMID: 36366046 PMCID: PMC9655537 DOI: 10.3390/s22218349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 10/21/2022] [Accepted: 10/27/2022] [Indexed: 06/16/2023]
Abstract
Coherent plane wave compounding (CPWC) reconstructs transmit focusing by coherently summing several low-resolution plane-wave (PW) images from different transmit angles to improve its image resolution and quality. The high frame rate of CPWC imaging enables a much larger number of Doppler ensembles such that the Doppler estimation of blood flow becomes more reliable. Due to the unfocused PW transmission, however, one major limitation of the Doppler estimation in CPWC imaging is the relatively low signal-to-noise ratio (SNR). Conventionally, the Doppler power is estimated by a zero-lag autocorrelation which reduces the noise variance, but not the noise level. A higher-lag autocorrelation method such as the first-lag (R(1)) power Doppler image has been developed to take advantage of the signal coherence in the temporal direction for suppressing uncorrelated random noises. In this paper, we propose a novel Temporal Multiply-and-Sum (TMAS) power Doppler detection method to further improve the noise suppression of the higher-lag method by modulating the signal coherence among the temporal correlation pairs in the higher-lag autocorrelation with a tunable pt value. Unlike the adaptive beamforming methods which demand for either receive-channel-domain or transmit-domain processing to exploit the spatial coherence of the blood flow signal, the proposed TMAS power Doppler can share the routine beamforming architecture with CPWC imaging. The simulated results show that when it is compared to the original R(1) counterpart, the TMAS power Doppler image with the pt value of 2.5 significantly improves the SNR by 8 dB for the cross-view flow velocity within the Nyquist rate. The TMAS power Doppler, however, suffers from the signal decorrelation of the blood flow, and thus, it relies on not only the pt value and the flow velocity, but also the flow direction relative to the geometry of acoustic beam. The experimental results in the flow phantom and in vivo dataset also agree with the simulations.
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Affiliation(s)
- Che-Chou Shen
- Correspondence: ; Tel.: +886-2-27301229; Fax: +886-2-27376699
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Wahyulaksana G, Wei L, Schoormans J, Voorneveld J, van der Steen AFW, de Jong N, Vos HJ. Independent Component Analysis Filter for Small Vessel Contrast Imaging During Fast Tissue Motion. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2022; 69:2282-2292. [PMID: 35594222 DOI: 10.1109/tuffc.2022.3176742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Suppressing tissue clutter is an essential step in blood flow estimation and visualization, even when using ultrasound contrast agents. Blind source separation (BSS)-based clutter filter for high-framerate ultrasound imaging has been reported to perform better in tissue clutter suppression than the conventional frequency-based wall filter and nonlinear contrast pulsing schemes. The most notable BSS technique, singular value decomposition (SVD) has shown compelling results in cases of slow tissue motion. However, its performance degrades when the tissue motion is faster than the blood flow speed, conditions that are likely to occur when imaging the small vessels, such as in the myocardium. Independent component analysis (ICA) is another BSS technique that has been implemented as a clutter filter in the spatiotemporal domain. Instead, we propose to implement ICA in the spatial domain where motion should have less impact. In this work, we propose a clutter filter with the combination of SVD and ICA to improve the contrast-to-background ratio (CBR) in cases where tissue velocity is significantly faster than the flow speed. In an in vitro study, the range of fast tissue motion velocity was 5-25 mm/s and the range of flow speed was 1-12 mm/s. Our results show that the combination of ICA and SVD yields 7-10 dB higher CBR than SVD alone, especially in the tissue high-velocity range. The improvement is crucial for cardiac imaging where relatively fast myocardial motions are expected.
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Zhang N, Nguyen MB, Mertens L, Barron DJ, Villemain O, Baranger J. Improving coronary ultrafast Doppler angiography using fractional moving blood volume and motion-adaptive ensemble length. Phys Med Biol 2022; 67. [DOI: 10.1088/1361-6560/ac7430] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Accepted: 05/27/2022] [Indexed: 11/12/2022]
Abstract
Abstract
Coronary microperfusion assessment is a key parameter for understanding cardiac function. Currently, coronary ultrafast Doppler angiography is the only non-invasive clinical imaging technique able to assess coronary microcirculation quantitatively in humans. In this study, we propose to use fractional moving blood volume (FMBV), proportional to the red blood cell concentration, as a metric for perfusion. FMBV compares the power Doppler in a region of interest (ROI) inside the myocardium to the power Doppler of a reference area in the heart chamber, fully filled with blood. This normalization gives then relative values of the ROI blood filling. However, due to the impact of ultrasound attenuation and elevation focus on power Doppler values, the reference area and the ROI need to be at the same depth to allow this normalization. This condition is rarely satisfied in vivo due to the cardiac anatomy. Hereby, we propose to locally compensate the attenuation between the ROI and the reference, by measuring the attenuation law on a phantom. We quantified the efficiency of this approach by comparing FMBV with and without compensation on a flow phantom. Compensated FMBV was able to estimate the ground-truth FMBV with less than 5% variation. This method was then adapted to the in vivo case of myocardial perfusion imaging during heart surgery on human neonates. The translation from in vitro to in vivo required an additional clutter filtering step to ensure that blood signals could be correctly identified in the fast-moving myocardium. We applied the singular value decomposition filter on temporal sliding windows whose lengths were a function of myocardium motion. This motion-adaptive temporal sliding window approach was able to improve blood and tissue separation in terms of contrast-to-noise ratio, as compared to well-established constant-length sliding window approaches. Therefore, compensated FMBV and singular value decomposition assisted with motion-adaptive temporal sliding windows improves the quantification of blood volume in coronary ultrafast Doppler angiography.
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Bourquin C, Poree J, Lesage F, Provost J. In Vivo Pulsatility Measurement of Cerebral Microcirculation in Rodents Using Dynamic Ultrasound Localization Microscopy. IEEE TRANSACTIONS ON MEDICAL IMAGING 2022; 41:782-792. [PMID: 34710041 DOI: 10.1109/tmi.2021.3123912] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
An increased pulse pressure, due to arteries stiffening with age and cardiovascular disease, may lead to downstream brain damage in microvessels and cognitive decline. Brain-wide imaging of the pulsatility propagation from main feeding arteries to capillaries in small animals could improve our understanding of the link between pulsatility and cognitive decline. However, it requires higher spatiotemporal resolution and penetration depth than currently available with existing brain imaging techniques. Herein, we show the feasibility of performing Dynamic Ultrasound Localization Microscopy (DULM), a novel imaging approach to capture hemodynamics with a subwavelength resolution. By producing cine-loops of flowing microbubbles in 2D in the whole rodent brain lasting several cardiac cycles, DULM performed pulsatility measurements in microvessels in-depth, in vivo, with and without craniotomy. Cortical veins and arteries were shown to have a significatively different pulsatility index and the method was compared against Contrast Enhanced Ultrafast Ultrasound Doppler (CEUFD) pulsatility measurements.
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Liu Z, Wang L, Meng Y, He T, He S, Yang Y, Wang L, Tian J, Li D, Yan P, Gong M, Liu Q, Xiao Q. All-fiber high-speed image detection enabled by deep learning. Nat Commun 2022; 13:1433. [PMID: 35301332 PMCID: PMC8930987 DOI: 10.1038/s41467-022-29178-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 02/24/2022] [Indexed: 12/29/2022] Open
Abstract
Ultra-high-speed imaging serves as a foundation for modern science. While in biomedicine, optical-fiber-based endoscopy is often required for in vivo applications, the combination of high speed with the fiber endoscopy, which is vital for exploring transient biomedical phenomena, still confronts some challenges. We propose all-fiber imaging at high speeds, which is achieved based on the transformation of two-dimensional spatial information into one-dimensional temporal pulsed streams by leveraging high intermodal dispersion in a multimode fiber. Neural networks are trained to reconstruct images from the temporal waveforms. It can not only detect content-aware images with high quality, but also detect images of different kinds from the training images with slightly reduced quality. The fiber probe can detect micron-scale objects with a high frame rate (15.4 Mfps) and large frame depth (10,000). This scheme combines high speeds with high mechanical flexibility and integration and may stimulate future research exploring various phenomena in vivo.
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Affiliation(s)
- Zhoutian Liu
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China
| | - Lele Wang
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China
| | - Yuan Meng
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China
| | - Tiantian He
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China
| | - Sifeng He
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China
| | - Yousi Yang
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China
| | - Liuyue Wang
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China
| | - Jiading Tian
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China
| | - Dan Li
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China.,Key Laboratory of Photonic Control Technology, Ministry of Education, Tsinghua University, Beijing, 100084, China
| | - Ping Yan
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China.,Key Laboratory of Photonic Control Technology, Ministry of Education, Tsinghua University, Beijing, 100084, China
| | - Mali Gong
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China.,Key Laboratory of Photonic Control Technology, Ministry of Education, Tsinghua University, Beijing, 100084, China
| | - Qiang Liu
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China.,Key Laboratory of Photonic Control Technology, Ministry of Education, Tsinghua University, Beijing, 100084, China
| | - Qirong Xiao
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China. .,Key Laboratory of Photonic Control Technology, Ministry of Education, Tsinghua University, Beijing, 100084, China.
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Lei S, Zhang G, Zhu B, Long X, Jiang Z, Liu Y, Hu D, Sheng Z, Zhang Q, Wang C, Gao Z, Zheng H, Ma T. In Vivo Ultrasound Localization Microscopy Imaging of the Kidney's Microvasculature With Block-Matching 3-D Denoising. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2022; 69:523-533. [PMID: 34727030 DOI: 10.1109/tuffc.2021.3125010] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Structural abnormalities and functional changes of renal microvascular networks play a significant pathophysiologic role in the occurrence of kidney diseases. Super-resolution ultrasound imaging has been successfully utilized to visualize the microvascular network and provide valuable diagnostic information. To prevent the burst of microbubbles, a lower mechanical index (MI) is generally used in ultrasound localization microscopy (ULM) imaging. However, high noise levels lead to incorrect signal localizations in relatively low-MI settings and deep tissue. In this study, we implemented a block-matching 3-D (BM3D) image-denoising method, after the application of singular value decomposition filtering, to further suppress the noise at various depths. The in vitro flow-phantom results show that the BM3D method helps the significant reduction of the error localizations, thus improving the localization accuracy. In vivo rhesus macaque experiments help conclude that the BM3D method improves the resolution more than other image-based denoising techniques, such as the nonlocal means method. The obtained clutter-filtered images with fewer incorrect localizations can enable robust ULM imaging, thus helping in establishing an effective diagnostic tool.
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Single-Sided Ultrasound Imaging of the Bone Cortex: Anatomy, Tissue Characterization and Blood Flow. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1364:197-225. [DOI: 10.1007/978-3-030-91979-5_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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11
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Shen CC, Chu YC. DMAS Beamforming with Complementary Subset Transmit for Ultrasound Coherence-Based Power Doppler Detection in Multi-Angle Plane-Wave Imaging. SENSORS 2021; 21:s21144856. [PMID: 34300594 PMCID: PMC8309888 DOI: 10.3390/s21144856] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 06/30/2021] [Accepted: 07/13/2021] [Indexed: 11/24/2022]
Abstract
Conventional ultrasonic coherent plane-wave (PW) compounding corresponds to Delay-and-Sum (DAS) beamforming of low-resolution images from distinct PW transmit angles. Nonetheless, the trade-off between the level of clutter artifacts and the number of PW transmit angle may compromise the image quality in ultrafast acquisition. Delay-Multiply-and-Sum (DMAS) beamforming in the dimension of PW transmit angle is capable of suppressing clutter interference and is readily compatible with the conventional method. In DMAS, a tunable p value is used to modulate the signal coherence estimated from the low-resolution images to produce the final high-resolution output and does not require huge memory allocation to record all the received channel data in multi-angle PW imaging. In this study, DMAS beamforming is used to construct a novel coherence-based power Doppler detection together with the complementary subset transmit (CST) technique to further reduce the noise level. For p = 2.0 as an example, simulation results indicate that the DMAS beamforming alone can improve the Doppler SNR by 8.2 dB compared to DAS counterpart. Another 6-dB increase in Doppler SNR can be further obtained when the CST technique is combined with DMAS beamforming with sufficient ensemble averaging. The CST technique can also be performed with DAS beamforming, though the improvement in Doppler SNR and CNR is relatively minor. Experimental results also agree with the simulations. Nonetheless, since the DMAS beamforming involves multiplicative operation, clutter filtering in the ensemble direction has to be performed on the low-resolution images before DMAS to remove the stationary tissue without coupling from the flow signal.
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Affiliation(s)
- Che-Chou Shen
- Correspondence: ; Tel.: +886-2-27301229; Fax: +886-2-27376699
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12
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Hardy E, Porée J, Belgharbi H, Bourquin C, Lesage F, Provost J. Sparse channel sampling for ultrasound localization microscopy (SPARSE-ULM). Phys Med Biol 2021; 66. [PMID: 33761492 DOI: 10.1088/1361-6560/abf1b6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 03/24/2021] [Indexed: 01/23/2023]
Abstract
Ultrasound localization microscopy (ULM) has recently enabled the mapping of the cerebral vasculaturein vivowith a resolution ten times smaller than the wavelength used, down to ten microns. However, with frame rates up to 20000 frames per second, this method requires large amount of data to be acquired, transmitted, stored, and processed. The transfer rate is, as of today, one of the main limiting factors of this technology. Herein, we introduce a novel reconstruction framework to decrease this quantity of data to be acquired and the complexity of the required hardware by randomly subsampling the channels of a linear probe. Method performance evaluation as well as parameters optimization were conductedin silicousing the SIMUS simulation software in an anatomically realistic phantom and then compared toin vivoacquisitions in a rat brain after craniotomy. Results show that reducing the number of active elements deteriorates the signal-to-noise ratio and could lead to false microbubbles detections but has limited effect on localization accuracy. In simulation, the false positive rate on microbubble detection deteriorates from 3.7% for 128 channels in receive and 7 steered angles to 11% for 16 channels and 7 angles. The average localization accuracy ranges from 10.6μm and 9.93μm for 16 channels/3 angles and 128 channels/13 angles respectively. These results suggest that a compromise can be found between the number of channels and the quality of the reconstructed vascular network and demonstrate feasibility of performing ULM with a reduced number of channels in receive, paving the way for low-cost devices enabling high-resolution vascular mapping.
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Affiliation(s)
- Erwan Hardy
- Engineering Physics Department, Polytechnique Montréal, Montréal, Canada
| | - Jonathan Porée
- Engineering Physics Department, Polytechnique Montréal, Montréal, Canada
| | - Hatim Belgharbi
- Engineering Physics Department, Polytechnique Montréal, Montréal, Canada
| | - Chloé Bourquin
- Engineering Physics Department, Polytechnique Montréal, Montréal, Canada
| | - Frédéric Lesage
- Electrical Engineering Department, Polytechnique Montréal, Montréal, Canada.,Montréal Heart Institute, Montréal, Canada
| | - Jean Provost
- Engineering Physics Department, Polytechnique Montréal, Montréal, Canada.,Montréal Heart Institute, Montréal, Canada
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Pham DH, Basarab A, Zemmoura I, Remenieras JP, Kouame D. Joint Blind Deconvolution and Robust Principal Component Analysis for Blood Flow Estimation in Medical Ultrasound Imaging. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2021; 68:969-978. [PMID: 32997626 DOI: 10.1109/tuffc.2020.3027956] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
This article addresses the problem of high-resolution Doppler blood flow estimation from an ultrafast sequence of ultrasound images. Formulating the separation of clutter and blood components as an inverse problem has been shown in the literature to be a good alternative to spatio-temporal singular value decomposition (SVD)-based clutter filtering. In particular, a deconvolution step has recently been embedded in such a problem to mitigate the influence of the point spread function (PSF) of the imaging system. Deconvolution was shown in this context to improve the accuracy of the blood flow reconstruction. However, the PSF needs to be measured experimentally, and measuring it requires nontrivial experimental setups. To overcome this limitation, we propose herein a blind deconvolution method able to estimate both the blood component and the PSF from Doppler data. Numerical experiments conducted on simulated and in vivo data demonstrate qualitatively and quantitatively the effectiveness of the proposed approach in comparison with the previous method based on experimentally measured PSF and two other state-of-the-art approaches.
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14
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Micro Non-Uniform Linear Array (MNULA) for Ultrasound Plane Wave Imaging. SENSORS 2021; 21:s21020640. [PMID: 33477606 PMCID: PMC7831312 DOI: 10.3390/s21020640] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 01/05/2021] [Accepted: 01/14/2021] [Indexed: 11/20/2022]
Abstract
Ultrasound plane wave imaging technology has been applied to more clinical situations than ever before because of its rapid imaging speed and stable imaging quality. Most transducers used in plane wave imaging are linear arrays, but their structures limit the application of plane wave imaging technology in some special clinical situations, especially in the endoscopic environment. In the endoscopic environment, the size of the linear array transducer is strictly miniaturized, and the imaging range is also limited to the near field. Meanwhile, the near field of a micro linear array has serious mutual interferences between elements, which is against the imaging quality of near field. Therefore, we propose a new structure of a micro ultrasound linear array for plane wave imaging. In this paper, a theoretical comparison is given through sound field and imaging simulations. On the basis of primary work and laboratory technology, micro uniform and non-uniform linear arrays were made and experimented with the phantom setting. We selected appropriate evaluation parameters to verify the imaging results. Finally, we concluded that the micro non-uniform linear array eliminated the artifacts better than the micro uniform linear array without the additional use of signal processing methods, especially for target points in the near-field. We believe this study provides a possible solution for plane wave imaging in cramped environments like endoscopy.
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15
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Villemain O, Baranger J, Jalal Z, Lam C, Calais J, Pernot M, Cifra B, Friedberg MK, Mertens L. Non-invasive imaging techniques to assess myocardial perfusion. Expert Rev Med Devices 2020; 17:1133-1144. [PMID: 33044100 DOI: 10.1080/17434440.2020.1834844] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
INTRODUCTION Coronary artery disease affecting myocardial perfusion continues to be the leading cause of cardiovascular morbidity and mortality worldwide. While invasive evaluation based on coronary angiography and flow measurements still is considered the reference technique for assessing myocardial perfusion, technological evolutions in noninvasive imaging techniques resulted in them playing a more important role in assessing myocardial perfusion influencing therapeutic decision-making and prognostication. AREAS COVERED Different imaging modalities are used to evaluate coronary perfusion, including echocardiography, coronary computerized tomography scan, magnetic resonance imaging, and nuclear myocardial perfusion imaging. Through a combination of different techniques, it is possible to describe coronary artery anatomy and the diameter of the epicardial vessels but more recently also of the coronary microcirculation. Quantification of myocardial perfusion is feasible both at baseline and during pharmacological or physiological stress. EXPERT OPINION The objective of this state-of-the-art paper is to review the recent evolutions in imaging methods to estimate myocardial perfusion and to discuss the diagnostic strengths and limitations of the different techniques. The new ultrasound technologies and the hybrid approaches seem to be the future is these fields.
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Affiliation(s)
- Olivier Villemain
- Division of Cardiology, Department of Paediatrics, The Hospital for Sick Children, University of Toronto , Toronto, ON, Canada.,Translational Medicine Department, SickKids Research Institute , Toronto, ON, Canada.,Medical Biophysics Department, University of Toronto , Toronto, ON, Canada
| | - Jérôme Baranger
- Translational Medicine Department, SickKids Research Institute , Toronto, ON, Canada
| | - Zakaria Jalal
- Department of Pediatric and Adult Congenital Cardiology, Bordeaux University Hospital (CHU) , Pessac, France.,IHU Liryc, Electrophysiology and Heart Modeling Institute, Fondation Bordeaux Université , Pessac- Bordeaux, France
| | - Christopher Lam
- Department of Diagnostic Imaging, The Hospital for Sick Children , Toronto, ON, Canada.,Department of Medical Imaging, University of Toronto , Toronto, ON, Canada
| | - Jérémie Calais
- Ahmanson Translational Theranostics Division, Department of Molecular & Medical Pharmacology, University of California Los Angeles , Los Angeles, CA, USA.,Jonsson Comprehensive Cancer Center, University of California Los Angeles , Los Angeles, CA, USA.,Physics & Biology in Medicine Interdepartmental Graduate Program, David Geffen School of Medicine, University of California Los Angeles , Los Angeles, CA, USA.,Institute of Urologic Oncology, University of California Los Angeles , Los Angeles, CA, USA
| | - Mathieu Pernot
- Physics for Medicine Paris, INSERM U1273, ESPCI Paris, CNRS FRE 2031, PSL Research University , Paris, France
| | - Barbara Cifra
- Division of Cardiology, Department of Paediatrics, The Hospital for Sick Children, University of Toronto , Toronto, ON, Canada
| | - Mark K Friedberg
- Division of Cardiology, Department of Paediatrics, The Hospital for Sick Children, University of Toronto , Toronto, ON, Canada.,Translational Medicine Department, SickKids Research Institute , Toronto, ON, Canada
| | - Luc Mertens
- Division of Cardiology, Department of Paediatrics, The Hospital for Sick Children, University of Toronto , Toronto, ON, Canada.,Translational Medicine Department, SickKids Research Institute , Toronto, ON, Canada
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16
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Villemain O, Baranger J, Friedberg MK, Papadacci C, Dizeux A, Messas E, Tanter M, Pernot M, Mertens L. Ultrafast Ultrasound Imaging in Pediatric and Adult Cardiology. JACC Cardiovasc Imaging 2020; 13:1771-1791. [DOI: 10.1016/j.jcmg.2019.09.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 08/29/2019] [Accepted: 09/03/2019] [Indexed: 02/08/2023]
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17
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Wang Y, Zheng C, Peng H. Dynamic coherence factor based on the standard deviation for coherent plane-wave compounding. Comput Biol Med 2019; 108:249-262. [DOI: 10.1016/j.compbiomed.2019.03.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 03/22/2019] [Accepted: 03/23/2019] [Indexed: 11/29/2022]
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18
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Demené C, Mairesse J, Baranger J, Tanter M, Baud O. Ultrafast Doppler for neonatal brain imaging. Neuroimage 2019; 185:851-856. [DOI: 10.1016/j.neuroimage.2018.04.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2017] [Revised: 04/03/2018] [Accepted: 04/08/2018] [Indexed: 12/18/2022] Open
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19
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Toulemonde M, Li Y, Lin S, Cordonnier F, Butler M, Duncan WC, Eckersley RJ, Sboros V, Tang MX. High-Frame-Rate Contrast Echocardiography Using Diverging Waves: Initial In Vitro and In Vivo Evaluation. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2018; 65:2212-2221. [PMID: 30028698 DOI: 10.1109/tuffc.2018.2856756] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Contrast echocardiography (CE) ultrasound with microbubble contrast agents has significantly advanced our capability for assessment of cardiac function, including myocardium perfusion quantification. However, in standard CE techniques obtained with line by line scanning, the frame rate and image quality are limited. Recent research has shown significant frame-rate improvement in noncontrast cardiac imaging. In this work, we present and initially evaluate, both in vitro and in vivo, a high-frame-rate (HFR) CE imaging system using diverging waves and pulse inversion sequence. An imaging frame rate of 5500 frames/s before and 250 frames/s after compounding is achieved. A destruction-replenishment sequence has also been developed. The developed HFR CE is compared with standard CE in vitro on a phantom and then in vivo on a sheep heart. The image signal-to-noise ratio and contrast between the myocardium and the chamber are evaluated. The results show up to 13.4-dB improvement in contrast for HFR CE over standard CE when compared at the same display frame rate even when the average spatial acoustic pressure in HFR CE is 36% lower than the standard CE. It is also found that when coherent compounding is used, the HFR CE image intensity can be significantly modulated by the flow motion in the chamber.
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20
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Maresca D, Correia M, Tanter M, Ghaleh B, Pernot M. Adaptive Spatiotemporal Filtering for Coronary Ultrafast Doppler Angiography. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2018; 65:2201-2204. [PMID: 30418874 DOI: 10.1109/tuffc.2018.2870083] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The heart's supply of oxygen and nutrients relies on the coronary vasculature, which branches from millimeter-sized arteries down to micrometer-sized capillaries. To date, imaging technologies can only detect large epicardial coronary vessels, whereas the intramural coronary vasculature remains invisible due to cardiac motion. We recently introduced coronary ultrafast Doppler angiography, a noninvasive vascular imaging technology based on ultrafast ultrasound that enables the visualization of epicardial and intramural coronary vasculature in humans. In this letter we describe, using an open-chest swine data set, the adaptive spatiotemporal filtering method that was developed for the detection of slow blood flows embedded in rapid myocardial motion.
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21
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Baranger J, Arnal B, Perren F, Baud O, Tanter M, Demene C. Adaptive Spatiotemporal SVD Clutter Filtering for Ultrafast Doppler Imaging Using Similarity of Spatial Singular Vectors. IEEE TRANSACTIONS ON MEDICAL IMAGING 2018; 37:1574-1586. [PMID: 29969408 DOI: 10.1109/tmi.2018.2789499] [Citation(s) in RCA: 121] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Singular value decomposition of ultrafast imaging ultrasonic data sets has recently been shown to build a vector basis far more adapted to the discrimination of tissue and blood flow than the classical Fourier basis, improving by large factor clutter filtering and blood flow estimation. However, the question of optimally estimating the boundary between the tissue subspace and the blood flow subspace remained unanswered. Here, we introduce an efficient estimator for automatic thresholding of subspaces and compare it to an exhaustive list of thirteen estimators that could achieve this task based on the main characteristics of the singular components, namely the singular values, the temporal singular vectors, and the spatial singular vectors. The performance of those fourteen estimators was tested in vitro in a large set of controlled experimental conditions with different tissue motion and flow speeds on a phantom. The estimator based on the degree of resemblance of spatial singular vectors outperformed all others. Apart from solving the thresholding problem, the additional benefit with this estimator was its denoising capabilities, strongly increasing the contrast to noise ratio and lowering the noise floor by at least 5 dB. This confirms that, contrary to conventional clutter filtering techniques that are almost exclusively based on temporal characteristics, efficient clutter filtering of ultrafast Doppler imaging cannot overlook space. Finally, this estimator was applied in vivo on various organs (human brain, kidney, carotid, and thyroid) and showed efficient clutter filtering and noise suppression, improving largely the dynamic range of the obtained ultrafast power Doppler images.
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22
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Kaddoura T, Au A, Kawchuk G, Uwiera R, Fox R, Zemp R. Non-invasive spinal vibration testing using ultrafast ultrasound imaging: A new way to measure spine function. Sci Rep 2018; 8:9611. [PMID: 29941980 PMCID: PMC6018395 DOI: 10.1038/s41598-018-27816-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 06/11/2018] [Indexed: 11/17/2022] Open
Abstract
Ultrafast ultrasound imaging is used to capture driven spinal vibrations as a new method for non-invasive spinal testing in living subjects. Previously, it has been shown that accelerometer-based vibration testing in cadaveric models can reveal the presence, location and magnitude of spinal pathology. However, this process remains an invasive procedure as current non-invasive sensors are inadequate. In this paper, the ability of non-invasive ultrafast ultrasound to quantify in vivo vertebral vibration response across a broad range of frequencies (10–100Hz) in anesthetized pig models is investigated. Close agreement with invasive accelerometer measurements is achieved using the non-invasive ultrasound method, opening up unique opportunities to investigate spinal pathologies.
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Affiliation(s)
- Tarek Kaddoura
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada.
| | - Anthony Au
- Department of Physical Therapy, University of Alberta, Edmonton, Alberta, Canada
| | - Greg Kawchuk
- Department of Physical Therapy, University of Alberta, Edmonton, Alberta, Canada
| | - Richard Uwiera
- Department of Surgery, University of Alberta, Edmonton, Alberta, Canada
| | - Richard Fox
- Department of Agricultural, University of Alberta, Food and Nutritional Science, Edmonton, Alberta, Canada
| | - Roger Zemp
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada
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23
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Zhang Y, Guo Y, Lee WN. Ultrafast Ultrasound Imaging With Cascaded Dual-Polarity Waves. IEEE TRANSACTIONS ON MEDICAL IMAGING 2018; 37:906-917. [PMID: 29610070 DOI: 10.1109/tmi.2017.2781261] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Ultrafast ultrasound imaging using plane or diverging waves, instead of focused beams, has advanced greatly the development of novel ultrasound imaging methods for evaluating tissue functions beyond anatomical information. However, the sonographic signal-to-noise ratio (SNR) of ultrafast imaging remains limited due to the lack of transmission focusing, and thus insufficient acoustic energy delivery. We hereby propose a new ultrafast ultrasound imaging methodology with cascaded dual-polarity waves (CDWs), which consists of a pulse train with positive and negative polarities. A new coding scheme and a corresponding linear decoding process were thereby designed to obtain the recovered signals with increased amplitude, thus increasing the SNR without sacrificing the frame rate. The newly designed CDW ultrafast ultrasound imaging technique achieved higher quality B-mode images than coherent plane-wave compounding (CPWC) and multiplane wave (MW) imaging in a calibration phantom, ex vivo pork belly, and in vivo human back muscle. CDW imaging shows a significant improvement in the SNR (10.71 dB versus CPWC and 7.62 dB versus MW), penetration depth (36.94% versus CPWC and 35.14% versus MW), and contrast ratio in deep regions (5.97 dB versus CPWC and 5.05 dB versus MW) without compromising other image quality metrics, such as spatial resolution and frame rate. The enhanced image qualities and ultrafast frame rates offered by CDW imaging beget great potential for various novel imaging applications.
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24
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Provost J, Garofalakis A, Sourdon J, Bouda D, Berthon B, Viel T, Perez-Liva M, Lussey-Lepoutre C, Favier J, Correia M, Pernot M, Chiche J, Pouysségur J, Tanter M, Tavitian B. Simultaneous positron emission tomography and ultrafast ultrasound for hybrid molecular, anatomical and functional imaging. Nat Biomed Eng 2018; 2:85-94. [PMID: 31015628 DOI: 10.1038/s41551-018-0188-z] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Accepted: 12/23/2017] [Indexed: 12/21/2022]
Abstract
Positron emission tomography-computed tomography (PET-CT) is the most sensitive molecular imaging modality, but it does not easily allow for rapid temporal acquisition. Ultrafast ultrasound imaging (UUI)-a recently introduced technology based on ultrasonic holography-leverages frame rates of up to several thousand images per second to quantitatively map, at high resolution, haemodynamic, biomechanical, electrophysiological and structural parameters. Here, we describe a pre-clinical scanner that registers PET-CT and UUI volumes acquired simultaneously and offers multiple combinations for imaging. We demonstrate that PET-CT-UUI allows for simultaneous images of the vasculature and metabolism during tumour growth in mice and rats, as well as for synchronized multi-modal cardiac cine-loops. Combined anatomical, functional and molecular imaging with PET-CT-UUI represents a high-performance and clinically translatable technology for biomedical research.
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Affiliation(s)
- Jean Provost
- Institut Langevin, Ecole Supérieure de Physique et de Chimie Industrielles, Paris Sciences and Letters Research University CNRS UMR 7587 Inserm U979, Inserm Technology Research Accelerator in Biomedical Ultrasound, Paris, France
| | - Anikitos Garofalakis
- Inserm, UMR970, Paris Cardiovascular Research Center, Paris, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Joevin Sourdon
- Inserm, UMR970, Paris Cardiovascular Research Center, Paris, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Damien Bouda
- Inserm, UMR970, Paris Cardiovascular Research Center, Paris, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Béatrice Berthon
- Institut Langevin, Ecole Supérieure de Physique et de Chimie Industrielles, Paris Sciences and Letters Research University CNRS UMR 7587 Inserm U979, Inserm Technology Research Accelerator in Biomedical Ultrasound, Paris, France
| | - Thomas Viel
- Inserm, UMR970, Paris Cardiovascular Research Center, Paris, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Mailyn Perez-Liva
- Inserm, UMR970, Paris Cardiovascular Research Center, Paris, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Charlotte Lussey-Lepoutre
- Inserm, UMR970, Paris Cardiovascular Research Center, Paris, France.,Faculté de Médecine, Université Pierre et Marie Curie, Paris, France.,Nuclear Medicine Department, Pitié-Salpêtrière Hospital, Paris, France
| | - Judith Favier
- Inserm, UMR970, Paris Cardiovascular Research Center, Paris, France.,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Mafalda Correia
- Institut Langevin, Ecole Supérieure de Physique et de Chimie Industrielles, Paris Sciences and Letters Research University CNRS UMR 7587 Inserm U979, Inserm Technology Research Accelerator in Biomedical Ultrasound, Paris, France
| | - Mathieu Pernot
- Institut Langevin, Ecole Supérieure de Physique et de Chimie Industrielles, Paris Sciences and Letters Research University CNRS UMR 7587 Inserm U979, Inserm Technology Research Accelerator in Biomedical Ultrasound, Paris, France
| | - Johanna Chiche
- Faculté de Médecine, Université de Nice Sophia Antipolis, Nice, France.,Équipe Contrôle Métabolique des Morts Cellulaires, Inserm, U1065, Centre Méditerranéen de Médecine Moléculaire, Nice, France
| | - Jacques Pouysségur
- Institute for Research on Cancer and Aging, Université de Nice Sophia Antipolis, Centre Antoine Lacassagne, Nice, France.,Department of Medical Biology, Centre Scientifique de Monaco, Monaco, Monaco
| | - Mickael Tanter
- Institut Langevin, Ecole Supérieure de Physique et de Chimie Industrielles, Paris Sciences and Letters Research University CNRS UMR 7587 Inserm U979, Inserm Technology Research Accelerator in Biomedical Ultrasound, Paris, France.
| | - Bertrand Tavitian
- Inserm, UMR970, Paris Cardiovascular Research Center, Paris, France. .,Faculté de Médecine, Université Paris Descartes, Sorbonne Paris Cité, Paris, France. .,Department of Radiology, Georges Pompidou European Hospital, Paris, France.
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25
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Zhang Y, Guo Y, Lee WN. Ultrafast Ultrasound Imaging Using Combined Transmissions With Cross-Coherence-Based Reconstruction. IEEE TRANSACTIONS ON MEDICAL IMAGING 2018; 37:337-348. [PMID: 28792890 DOI: 10.1109/tmi.2017.2736423] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Plane-wave-based ultrafast imaging has become the prevalent technique for non-conventional ultrasound imaging. The image quality, especially in terms of the suppression of artifacts, is generally compromised by reducing the number of transmissions for a higher frame rate. We hereby propose a new ultrafast imaging framework that reduces not only the side lobe artifacts but also the axial lobe artifacts using combined transmissions with a new coherence-based factor. The results from simulations, in vitro wire phantoms, the ex vivo porcine artery, and the in vivo porcine heart show that our proposed methodology greatly reduced the axial lobe artifact by 25±5 dB compared with coherent plane-wave compounding (CPWC), which was considered as the ultrafast imaging standard, and suppressed side lobe artifacts by 15 ± 5 dB compared with CPWC and coherent spherical-wave compounding. The reduction of artifacts in our proposed ultrafast imaging framework led to a better boundary delineation of soft tissues than CPWC.
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26
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Yiu BYS, Yu ACH. Spiral Flow Phantom for Ultrasound Flow Imaging Experimentation. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2017; 64:1840-1848. [PMID: 29035216 DOI: 10.1109/tuffc.2017.2762860] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
As new ultrasound flow imaging methods are being developed, there is a growing need to devise appropriate flow phantoms that can holistically assess the accuracy of the derived flow estimates. In this paper, we present a novel spiral flow phantom design whose Archimedean spiral lumen naturally gives rise to multi-directional flow over all possible angles (i.e., from 0° to 360°). Developed using lost-core casting principles, the phantom geometry comprised a three-loop spiral (4-mm diameter and 5-mm pitch), and it was set to operate in steady flow mode (3 mL/s flow rate). After characterizing the flow pattern within the spiral vessel using computational fluid dynamics (CFD) simulations, the phantom was applied to evaluate the performance of color flow imaging (CFI) and high-frame-rate vector flow imaging. Significant spurious coloring artifacts were found when using CFI to visualize flow in the spiral phantom. In contrast, using vector flow imaging (least-squares multi-angle Doppler based on a three-transmit and three-receive configuration), we observed consistent depiction of flow velocity magnitude and direction within the spiral vessel lumen. The spiral flow phantom was also found to be a useful tool in facilitating demonstration of dynamic flow visualization based on vector projectile imaging. Overall, these results demonstrate the spiral flow phantom's practical value in analyzing the efficacy of ultrasound flow estimation methods.
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27
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Noninvasive Imaging of the Coronary Vasculature Using Ultrafast Ultrasound. JACC Cardiovasc Imaging 2017; 11:798-808. [PMID: 28823737 PMCID: PMC5784807 DOI: 10.1016/j.jcmg.2017.05.021] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 05/03/2017] [Accepted: 05/13/2017] [Indexed: 11/30/2022]
Abstract
Objectives The aim of this study was to investigate the potential of coronary ultrafast Doppler angiography (CUDA), a novel vascular imaging technique based on ultrafast ultrasound, to image noninvasively with high sensitivity the intramyocardial coronary vasculature and quantify the coronary blood flow dynamics. Background Noninvasive coronary imaging techniques are currently limited to the observation of the epicardial coronary arteries. However, many studies have highlighted the importance of the coronary microcirculation and microvascular disease. Methods CUDA was performed in vivo in open-chest procedures in 9 swine. Ultrafast plane-wave imaging at 2,000 frames/s was combined to an adaptive spatiotemporal filtering to achieve ultrahigh-sensitive imaging of the coronary blood flows. Quantification of the flow change was performed during hyperemia after a 30-s left anterior descending (LAD) artery occlusion followed by reperfusion and was compared to gold standard measurements provided by a flowmeter probe placed at a proximal location on the LAD (n = 5). Coronary flow reserve was assessed during intravenous perfusion of adenosine. Vascular damages were evaluated during a second set of experiments in which the LAD was occluded for 90 min, followed by 150 min of reperfusion to induce myocardial infarction (n = 3). Finally, the transthoracic feasibility of CUDA was assessed on 2 adult and 2 pediatric volunteers. Results Ultrahigh-sensitive cine loops of venous and arterial intramyocardial blood flows were obtained within 1 cardiac cycle. Quantification of the coronary flow changes during hyperemia was in good agreement with gold standard measurements (r2 = 0.89), as well as the assessment of coronary flow reserve (2.35 ± 0.65 vs. 2.28 ± 0.84; p = NS). On the infarcted animals, CUDA images revealed the presence of strong hyperemia and the appearance of abnormal coronary vessel structures in the reperfused LAD territory. Finally, the feasibility of transthoracic coronary vasculature imaging was shown on 4 human volunteers. Conclusions Ultrafast Doppler imaging can map the coronary vasculature with high sensitivity and quantify intramural coronary blood flow changes.
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28
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Huang CC, Chen PY, Peng PH, Lee PY. 40 MHz high-frequency ultrafast ultrasound imaging. Med Phys 2017; 44:2185-2195. [PMID: 28369938 DOI: 10.1002/mp.12244] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 02/24/2017] [Accepted: 03/16/2017] [Indexed: 11/10/2022] Open
Abstract
PURPOSE Ultrafast high-frame-rate ultrasound imaging based on coherent-plane-wave compounding has been developed for many biomedical applications. Most coherent-plane-wave compounding systems typically operate at 3-15 MHz, and the image resolution for this frequency range is not sufficient for visualizing microstructure tissues. Therefore, the purpose of this study was to implement a high-frequency ultrafast ultrasound imaging operating at 40 MHz. METHODS The plane-wave compounding imaging and conventional multifocus B-mode imaging were performed using the Field II toolbox of MATLAB in simulation study. In experiments, plane-wave compounding images were obtained from a 256 channel ultrasound research platform with a 40 MHz array transducer. All images were produced by point-spread functions and cyst phantoms. The in vivo experiment was performed from zebrafish. Since high-frequency ultrasound exhibits a lower penetration, chirp excitation was applied to increase the imaging depth in simulation. RESULTS The simulation results showed that a lateral resolution of up to 66.93 μm and a contrast of up to 56.41 dB were achieved when using 75-angles plane waves in compounding imaging. The experimental results showed that a lateral resolution of up to 74.83 μm and a contrast of up to 44.62 dB were achieved when using 75-angles plane waves in compounding imaging. The dead zone and compounding noise are about 1.2 mm and 2.0 mm in depth for experimental compounding imaging, respectively. The structure of zebrafish heart was observed clearly using plane-wave compounding imaging. CONCLUSIONS The use of fewer than 23 angles for compounding allowed a frame rate higher than 1000 frames per second. However, the compounding imaging exhibits a similar lateral resolution of about 72 μm as the angle of plane wave is higher than 10 angles. This study shows the highest operational frequency for ultrafast high-frame-rate ultrasound imaging.
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Affiliation(s)
- Chih-Chung Huang
- Department of Biomedical Engineering, National Cheng Kung University, 701, No.1, University Rd, Tainan City, 70101, Taiwan
| | - Pei-Yu Chen
- Department of Biomedical Engineering, National Cheng Kung University, 701, No.1, University Rd, Tainan City, 70101, Taiwan
| | - Po-Hsun Peng
- Department of Electrical Engineering, Fu Jen Catholic University, New Taipei City, Taiwan
| | - Po-Yang Lee
- Department of Biomedical Engineering, National Cheng Kung University, 701, No.1, University Rd, Tainan City, 70101, Taiwan
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29
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Zhou X, Xia C, Stephen G, Khan F, Corner GA, Hoskins PR, Huang Z. Investigation of Ultrasound-Measured Flow Velocity, Flow Rate and Wall Shear Rate in Radial and Ulnar Arteries Using Simulation. ULTRASOUND IN MEDICINE & BIOLOGY 2017; 43:981-992. [PMID: 28236532 DOI: 10.1016/j.ultrasmedbio.2016.12.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2016] [Revised: 12/02/2016] [Accepted: 12/31/2016] [Indexed: 06/06/2023]
Abstract
Parameters of blood flow measured by ultrasound in radial and ulnar arteries, such as flow velocity, flow rate and wall shear rate, are widely used in clinical practice and clinical research. Investigation of these measurements is useful for evaluating accuracy and providing knowledge of error sources. A method for simulating the spectral Doppler ultrasound measurement process was developed with computational fluid dynamics providing flow-field data. Specific scanning factors were adjusted to investigate their influence on estimation of the maximum velocity waveform, and flow rate and wall shear rate were derived using the Womersley equation. The overestimation in maximum velocity increases greatly (peak systolic from about 10% to 30%, time-averaged from about 30% to 50%) when the beam-vessel angle is changed from 30° to 70°. The Womersley equation was able to estimate flow rate in both arteries with less than 3% error, but performed better in the radial artery (2.3% overestimation) than the ulnar artery (15.4% underestimation) in estimating wall shear rate. It is concluded that measurements of flow parameters in the radial and ulnar arteries with clinical ultrasound scanners are prone to clinically significant errors.
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Affiliation(s)
- Xiaowei Zhou
- School of Science and Engineering, University of Dundee, Dundee, United Kingdom
| | - Chunming Xia
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, China; NHS Tayside Medical Physics, Ninewells Hospital, Dundee, United Kingdom
| | - Gandy Stephen
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, China; NHS Tayside Medical Physics, Ninewells Hospital, Dundee, United Kingdom
| | - Faisel Khan
- Cardiovascular and Diabetes Medicine, Ninewells Hospital and Medical School, University of Dundee, Dundee, United Kingdom
| | - George A Corner
- School of Science and Engineering, University of Dundee, Dundee, United Kingdom
| | - Peter R Hoskins
- Centre for Cardiovascular Science, University of Edinburgh, Edinburgh, United Kingdom
| | - Zhihong Huang
- School of Science and Engineering, University of Dundee, Dundee, United Kingdom.
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Hingot V, Errico C, Tanter M, Couture O. Subwavelength motion-correction for ultrafast ultrasound localization microscopy. ULTRASONICS 2017; 77:17-21. [PMID: 28167316 DOI: 10.1016/j.ultras.2017.01.008] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 01/11/2017] [Accepted: 01/11/2017] [Indexed: 05/15/2023]
Abstract
Ultrafast Ultrasound Localization Microscopy uses microbubbles that are individually localized with a resolution below 10μm. Positions of the microbubbles are accumulated to create a super resolution image, which bypass the diffraction-limit of spatial resolution. However, microbubbles localization is affected by physiological motions at the micrometric scale. Here, we demonstrate a phase correlation method for rigid motion correction. Spatiotemporal filters extract tissue dominated images, which are tracked to correct linear motions and improve the precision of microbubbles' localization, improving the quality of the image. It is the first proof of concept towards a full motion correction strategy and super-resolution imaging in moving tissues.
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Affiliation(s)
- Vincent Hingot
- Institut Langevin, CNRS, INSERM, ESPCI Paris, PSL Research University, 17 rue Moreau, 75012 Paris, France.
| | - Claudia Errico
- Institut Langevin, CNRS, INSERM, ESPCI Paris, PSL Research University, 17 rue Moreau, 75012 Paris, France
| | - Mickael Tanter
- Institut Langevin, CNRS, INSERM, ESPCI Paris, PSL Research University, 17 rue Moreau, 75012 Paris, France
| | - Olivier Couture
- Institut Langevin, CNRS, INSERM, ESPCI Paris, PSL Research University, 17 rue Moreau, 75012 Paris, France.
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Gesnik M, Blaize K, Deffieux T, Gennisson JL, Sahel JA, Fink M, Picaud S, Tanter M. 3D functional ultrasound imaging of the cerebral visual system in rodents. Neuroimage 2017; 149:267-274. [PMID: 28167348 PMCID: PMC5387157 DOI: 10.1016/j.neuroimage.2017.01.071] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Revised: 01/27/2017] [Accepted: 01/30/2017] [Indexed: 12/11/2022] Open
Abstract
3D functional imaging of the whole brain activity during visual task is a challenging task in rodents due to the complex tri-dimensional shape of involved brain regions and the fine spatial and temporal resolutions required to reveal the visual tract. By coupling functional ultrasound (fUS) imaging with a translational motorized stage and an episodic visual stimulation device, we managed to accurately map and to recover the activity of the visual cortices, the Superior Colliculus (SC) and the Lateral Geniculate Nuclei (LGN) in 3D. Cerebral Blood Volume (CBV) responses during visual stimuli were found to be highly correlated with the visual stimulus time profile in visual cortices (r=0.6), SC (r=0.7) and LGN (r=0.7). These responses were found dependent on flickering frequency and contrast, and optimal stimulus parameters for largest CBV increases were obtained. In particular, increasing the flickering frequency higher than 7 Hz revealed a decrease of visual cortices response while the SC response was preserved. Finally, cross-correlation between CBV signals exhibited significant delays (d=0.35 s +/−0.1 s) between blood volume response in SC and visual cortices in response to our visual stimulus. These results emphasize the interest of fUS imaging as a whole brain neuroimaging modality for brain vision studies in rodent models.
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Affiliation(s)
- Marc Gesnik
- Institut Langevin, ESPCI Paris, PSL Research University, CNRS UMR 7587, INSERM U979, 75012 Paris, France.
| | - Kevin Blaize
- Institut de la Vision, Sorbonne Universités UPMC, University of Paris 06, INSERM UMR_S 968, CNRS UMR 7210, 75012 Paris, France
| | - Thomas Deffieux
- Institut Langevin, ESPCI Paris, PSL Research University, CNRS UMR 7587, INSERM U979, 75012 Paris, France
| | - Jean-Luc Gennisson
- Institut Langevin, ESPCI Paris, PSL Research University, CNRS UMR 7587, INSERM U979, 75012 Paris, France
| | - José-Alain Sahel
- Institut de la Vision, Sorbonne Universités UPMC, University of Paris 06, INSERM UMR_S 968, CNRS UMR 7210, 75012 Paris, France; Fondation Ophtalmologique Adolphe de Rothschild, 75019 Paris, France; CHNO des Quinze-Vingts, DHU Sight Restore, INSERM-DGOS CIC 1423, 75012 Paris, France; Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, 15213 PA, USA; Academie des Sciences, Paris
| | - Mathias Fink
- Institut Langevin, ESPCI Paris, PSL Research University, CNRS UMR 7587, INSERM U979, 75012 Paris, France
| | - Serge Picaud
- Institut de la Vision, Sorbonne Universités UPMC, University of Paris 06, INSERM UMR_S 968, CNRS UMR 7210, 75012 Paris, France
| | - Mickaël Tanter
- Institut Langevin, ESPCI Paris, PSL Research University, CNRS UMR 7587, INSERM U979, 75012 Paris, France
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Arnal B, Baranger J, Demene C, Tanter M, Pernot M. In vivo real-time cavitation imaging in moving organs. Phys Med Biol 2017; 62:843-857. [DOI: 10.1088/1361-6560/aa4fe8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Apostolakis IZ, McGarry MDJ, Bunting EA, Konofagou EE. Pulse wave imaging using coherent compounding in a phantom and in vivo. Phys Med Biol 2016; 62:1700-1730. [PMID: 28002039 DOI: 10.1088/1361-6560/aa553a] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Pulse wave velocity (PWV) is a surrogate marker of arterial stiffness linked to cardiovascular morbidity. Pulse wave imaging (PWI) is a technique developed by our group for imaging the pulse wave propagation in vivo. PWI requires high temporal and spatial resolution, which conventional ultrasonic imaging is unable to simultaneously provide. Coherent compounding is known to address this tradeoff and provides full aperture images at high frame rates. This study aims to implement PWI using coherent compounding within a GPU-accelerated framework. The results of the implemented method were validated using a silicone phantom against static mechanical testing. Reproducibility of the measured PWVs was assessed in the right common carotid of six healthy subjects (n = 6) approximately 10-15 mm before the bifurcation during two cardiac cycles over the course of 1-3 d. Good agreement of the measured PWVs (3.97 ± 1.21 m s-1, 4.08 ± 1.15 m s-1, p = 0.74) was obtained. The effects of frame rate, transmission angle and number of compounded plane waves on PWI performance were investigated in the six healthy volunteers. Performance metrics such as the reproducibility of the PWVs, the coefficient of determination (r 2), the SNR of the PWI axial wall velocities ([Formula: see text]) and the percentage of lateral positions where the pulse wave appears to arrive at the same time-point, indicating inadequacy of the temporal resolution (i.e. temporal resolution misses) were used to evaluate the effect of each parameter. Compounding plane waves transmitted at 1° increments with a linear array yielded optimal performance, generating significantly higher r 2 and [Formula: see text] values (p ⩽ 0.05). Higher frame rates (⩾1667 Hz) produced improvements with significant gains in the r 2 coefficient (p ⩽ 0.05) and significant increase in both r 2 and [Formula: see text] from single plane wave imaging to 3-plane wave compounding (p ⩽ 0.05). Optimal performance was established at 2778 Hz with 3 plane waves and at 1667 Hz with 5 plane waves.
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Correia M, Provost J, Tanter M, Pernot M. 4D ultrafast ultrasound flow imaging:in vivoquantification of arterial volumetric flow rate in a single heartbeat. Phys Med Biol 2016; 61:L48-L61. [DOI: 10.1088/0031-9155/61/23/l48] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Tremblay-Darveau C, Williams R, Sheeran PS, Milot L, Bruce M, Burns PN. Concepts and Tradeoffs in Velocity Estimation With Plane-Wave Contrast-Enhanced Doppler. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2016; 63:1890-1905. [PMID: 27824566 DOI: 10.1109/tuffc.2016.2596581] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
While long Doppler ensembles are, in principle, beneficial for velocity estimates, short acoustic pulses must be used in microbubble contrast-enhanced (CE) Doppler to mitigate microbubble destruction. This introduces inherent tradeoffs in velocity estimates with autocorrelators, which are studied here. A model of the autocorrelation function adapted to the microbubble Doppler signal accounting for transit time, the echo frequency uncertainty, and contrast-agent destruction is derived and validated in vitro. It is further demonstrated that a local measurement of the center frequency of the microbubble echo is essential in order to avoid significant bias in velocity estimates arising from the linear and nonlinear frequency-dependent scattering of microbubbles and compensate for the inherent speckle nature of the received echo frequency. For these reasons, broadband Doppler estimators (2-D autocorrelator and Radon projection) are better suited than simpler narrow-band estimators (1-D autocorrelator and 1-D Fourier transform) for CE flow assessment. A case study of perfusion in a VX-2 carcinoma using CE plane-wave Doppler is also shown. We demonstrate that even when considering all uncertainties associated with microbubble-related decorrelation (destruction, pulse bandwidth, transit time, and flow gradient) and the need for real-time imaging, a coefficient of variation of 4% on the axial velocity is achievable with plane-wave imaging.
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Yiu BYS, Yu ACH. Least-Squares Multi-Angle Doppler Estimators for Plane-Wave Vector Flow Imaging. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2016; 63:1733-1744. [PMID: 27824557 DOI: 10.1109/tuffc.2016.2582514] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Designing robust Doppler vector estimation strategies for use in plane-wave imaging schemes based on unfocused transmissions is a topic that has yet to be studied in depth. One potential solution is to use a multi-angle Doppler estimation approach that computes flow vectors via least-squares fitting, but its performance has not been established. Here, we investigated the efficacy of multi-angle Doppler vector estimators by: 1) comparing its performance with respect to the classical dual-angle (cross-beam) Doppler vector estimator and 2) examining the working effects of multi-angle Doppler vector estimators on flow visualization quality in the context of dynamic flow path rendering. Implementing Doppler vector estimators that use different combinations of transmit (Tx) and receive (Rx) steering angles, our analysis has compared the classical dual-angle Doppler method, a 5-Tx version of dual-angle Doppler, and various multi-angle Doppler configurations based on 3 Tx and 5 Tx. Two angle spans (10°, 20°) were examined in forming the steering angles. In imaging scenarios with known flow profiles (rotating disk and straight-tube parabolic flow), the 3-Tx, 3-Rx and 5-Tx, 5-Rx multi-angle configurations produced vector estimates with smaller variability compared with the dual-angle method, and the estimation results were more consistent with the use of a 20° angle span. Flow vectors derived from multi-angle Doppler estimators were also found to be effective in rendering the expected flow paths in both rotating disk and straight-tube imaging scenarios, while the ones derived from the dual-angle estimator yielded flow paths that deviated from the expected course. These results serve to attest that using multi-angle least-squares Doppler vector estimators, flow visualization can be consistently achieved.
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Peeples ES, Mehic E, Mourad PD, Juul SE. Fast Doppler as a novel bedside measure of cerebral perfusion in preterm infants. Pediatr Res 2016; 79:333-8. [PMID: 26539662 DOI: 10.1038/pr.2015.227] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Accepted: 08/12/2015] [Indexed: 11/09/2022]
Abstract
BACKGROUND Altered cerebral perfusion from impaired autoregulation may contribute to the morbidity and mortality associated with premature birth. We hypothesized that fast Doppler imaging could provide a reproducible bedside estimation of cerebral perfusion and autoregulation in preterm infants. METHODS This is a prospective pilot study using fast Doppler ultrasound to assess blood flow velocity in the basal ganglia of 19 subjects born at 26-32 wk gestation. Intraclass correlation provided a measure of test-retest reliability, and linear regression of cerebral blood flow velocity and heart rate or blood pressure allowed for estimations of autoregulatory ability. RESULTS The intraclass correlation when imaging in the first 48 h of life was 0.634. We found significant and independent correlations between the systolic blood flow velocity and both systolic blood pressure and heart rate (P = 0.015 and 0.012 respectively) only in the 26-28 wk gestational age infants in the first 48 h of life. CONCLUSION Our results suggest that fast Doppler provides reliable bedside measurements of cerebral blood flow velocity at the tissue level in premature infants, acting as a proxy for cerebral tissue perfusion. Additionally, autoregulation appears to be impaired in the extremely preterm infants, even within a normal range of blood pressures.
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Affiliation(s)
- Eric S Peeples
- Department of Pediatrics, University of Washington, Seattle, Washington
| | - Edin Mehic
- Department of Neurological Surgery, University of Washington, Seattle, Washington
| | - Pierre D Mourad
- Department of Neurological Surgery, University of Washington, Seattle, Washington.,Division of Engineering and Mathematics, University of Washington, Seattle, Washington
| | - Sandra E Juul
- Department of Pediatrics, University of Washington, Seattle, Washington
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Demené C, Deffieux T, Pernot M, Osmanski BF, Biran V, Gennisson JL, Sieu LA, Bergel A, Franqui S, Correas JM, Cohen I, Baud O, Tanter M. Spatiotemporal Clutter Filtering of Ultrafast Ultrasound Data Highly Increases Doppler and fUltrasound Sensitivity. IEEE TRANSACTIONS ON MEDICAL IMAGING 2015; 34:2271-85. [PMID: 25955583 DOI: 10.1109/tmi.2015.2428634] [Citation(s) in RCA: 433] [Impact Index Per Article: 48.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Ultrafast ultrasonic imaging is a rapidly developing field based on the unfocused transmission of plane or diverging ultrasound waves. This recent approach to ultrasound imaging leads to a large increase in raw ultrasound data available per acquisition. Bigger synchronous ultrasound imaging datasets can be exploited in order to strongly improve the discrimination between tissue and blood motion in the field of Doppler imaging. Here we propose a spatiotemporal singular value decomposition clutter rejection of ultrasonic data acquired at ultrafast frame rate. The singular value decomposition (SVD) takes benefits of the different features of tissue and blood motion in terms of spatiotemporal coherence and strongly outperforms conventional clutter rejection filters based on high pass temporal filtering. Whereas classical clutter filters operate on the temporal dimension only, SVD clutter filtering provides up to a four-dimensional approach (3D in space and 1D in time). We demonstrate the performance of SVD clutter filtering with a flow phantom study that showed an increased performance compared to other classical filters (better contrast to noise ratio with tissue motion between 1 and 10mm/s and axial blood flow as low as 2.6 mm/s). SVD clutter filtering revealed previously undetected blood flows such as microvascular networks or blood flows corrupted by significant tissue or probe motion artifacts. We report in vivo applications including small animal fUltrasound brain imaging (blood flow detection limit of 0.5 mm/s) and several clinical imaging cases, such as neonate brain imaging, liver or kidney Doppler imaging.
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39
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Errico C, Osmanski BF, Pezet S, Couture O, Lenkei Z, Tanter M. Transcranial functional ultrasound imaging of the brain using microbubble-enhanced ultrasensitive Doppler. Neuroimage 2015; 124:752-761. [PMID: 26416649 PMCID: PMC4686564 DOI: 10.1016/j.neuroimage.2015.09.037] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 08/13/2015] [Accepted: 09/14/2015] [Indexed: 11/15/2022] Open
Abstract
Functional ultrasound (fUS) is a novel neuroimaging technique, based on high-sensitivity ultrafast Doppler imaging of cerebral blood volume, capable of measuring brain activation and connectivity in rodents with high spatiotemporal resolution (100 μm, 1 ms). However, the skull attenuates acoustic waves, so fUS in rats currently requires craniotomy or a thinned-skull window. Here we propose a non-invasive approach by enhancing the fUS signal with a contrast agent, inert gas microbubbles. Plane-wave illumination of the brain at high frame rate (500 Hz compounded sequence with three tilted plane waves, PRF = 1500Hz with a 128 element 15 MHz linear transducer), yields highly-resolved neurovascular maps. We compared fUS imaging performance through the intact skull bone (transcranial fUS) versus a thinned-skull window in the same animal. First, we show that the vascular network of the adult rat brain can be imaged transcranially only after a bolus intravenous injection of microbubbles, which leads to a 9 dB gain in the contrast-to-tissue ratio. Next, we demonstrate that functional increase in the blood volume of the primary sensory cortex after targeted electrical-evoked stimulations of the sciatic nerve is observable transcranially in presence of contrast agents, with high reproducibility (Pearson's coefficient ρ = 0.7 ± 0.1, p = 0.85). Our work demonstrates that the combination of ultrafast Doppler imaging and injection of contrast agent allows non-invasive functional brain imaging through the intact skull bone in rats. These results should ease non-invasive longitudinal studies in rodents and open a promising perspective for the adoption of highly resolved fUS approaches for the adult human brain. We combined ultrafast sensitive Doppler with contrast-enhanced ultrasound imaging. We retrieved highly-resolved neurovascular transcranial maps with contrast agents. The presence of microbubbles compensates for the attenuation from the skull. fUS is sensitive to the local hyperemia in the rat brain through the skull with microbubbles. Transcranial fUS imaging allows non-invasive functional brain studies in rodents.
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Affiliation(s)
- Claudia Errico
- INSERM, Institut Langevin, 1 rue Jussieu, 75005, Paris, France; ESPCI ParisTech, PSL Research University, Institut Langevin, 1 rue Jussieu, 75005, Paris, France; CNRS, Institut Langevin, 1 rue Jussieu, 75005, Paris, France
| | - Bruno-Félix Osmanski
- INSERM, Institut Langevin, 1 rue Jussieu, 75005, Paris, France; ESPCI ParisTech, PSL Research University, Institut Langevin, 1 rue Jussieu, 75005, Paris, France; CNRS, Institut Langevin, 1 rue Jussieu, 75005, Paris, France
| | - Sophie Pezet
- CNRS, UMR 8249, 10 rue Vauquelin, 75005 Paris, France; Brain Plasticity Unit, ESPCI-ParisTech, PSL Research University 10 rue Vauquelin, 75005 Paris, France
| | - Olivier Couture
- INSERM, Institut Langevin, 1 rue Jussieu, 75005, Paris, France; ESPCI ParisTech, PSL Research University, Institut Langevin, 1 rue Jussieu, 75005, Paris, France; CNRS, Institut Langevin, 1 rue Jussieu, 75005, Paris, France
| | - Zsolt Lenkei
- CNRS, UMR 8249, 10 rue Vauquelin, 75005 Paris, France; Brain Plasticity Unit, ESPCI-ParisTech, PSL Research University 10 rue Vauquelin, 75005 Paris, France
| | - Mickael Tanter
- INSERM, Institut Langevin, 1 rue Jussieu, 75005, Paris, France; ESPCI ParisTech, PSL Research University, Institut Langevin, 1 rue Jussieu, 75005, Paris, France; CNRS, Institut Langevin, 1 rue Jussieu, 75005, Paris, France.
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Provost J, Papadacci C, Demene C, Gennisson JL, Tanter M, Pernot M. 3-D ultrafast Doppler imaging applied to the noninvasive mapping of blood vessels in vivo. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2015; 62:1467-72. [PMID: 26276956 PMCID: PMC4993233 DOI: 10.1109/tuffc.2015.007032] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Ultrafast Doppler imaging was introduced as a technique to quantify blood flow in an entire 2-D field of view, expanding the field of application of ultrasound imaging to the highly sensitive anatomical and functional mapping of blood vessels. We have recently developed 3-D ultrafast ultrasound imaging, a technique that can produce thousands of ultrasound volumes per second, based on a 3-D plane and diverging wave emissions, and demonstrated its clinical feasibility in human subjects in vivo. In this study, we show that noninvasive 3-D ultrafast power Doppler, pulsed Doppler, and color Doppler imaging can be used to perform imaging of blood vessels in humans when using coherent compounding of 3-D tilted plane waves. A customized, programmable, 1024-channel ultrasound system was designed to perform 3-D ultrafast imaging. Using a 32 × 32, 3-MHz matrix phased array (Vermon, Tours, France), volumes were beamformed by coherently compounding successive tilted plane wave emissions. Doppler processing was then applied in a voxel-wise fashion. The proof of principle of 3-D ultrafast power Doppler imaging was first performed by imaging Tygon tubes of various diameters, and in vivo feasibility was demonstrated by imaging small vessels in the human thyroid. Simultaneous 3-D color and pulsed Doppler imaging using compounded emissions were also applied in the carotid artery and the jugular vein in one healthy volunteer.
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41
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A Reconstruction Method of Blood Flow Velocity in Left Ventricle Using Color Flow Ultrasound. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2015; 2015:108274. [PMID: 26078773 PMCID: PMC4452383 DOI: 10.1155/2015/108274] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Accepted: 12/25/2014] [Indexed: 11/17/2022]
Abstract
Vortex flow imaging is a relatively new medical imaging method for the dynamic visualization of intracardiac blood flow, a potentially useful index of cardiac dysfunction. A reconstruction method is proposed here to quantify the distribution of blood flow velocity fields inside the left ventricle from color flow images compiled from ultrasound measurements. In this paper, a 2D incompressible Navier-Stokes equation with a mass source term is proposed to utilize the measurable color flow ultrasound data in a plane along with the moving boundary condition. The proposed model reflects out-of-plane blood flows on the imaging plane through the mass source term. The boundary conditions to solve the system of equations are derived from the dimensions of the ventricle extracted from 2D echocardiography data. The performance of the proposed method is evaluated numerically using synthetic flow data acquired from simulating left ventricle flows. The numerical simulations show the feasibility and potential usefulness of the proposed method of reconstructing the intracardiac flow fields. Of particular note is the finding that the mass source term in the proposed model improves the reconstruction performance.
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42
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Salles S, Chee AJY, Garcia D, Yu ACH, Vray D, Liebgott H. 2-D arterial wall motion imaging using ultrafast ultrasound and transverse oscillations. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2015; 62:1047-58. [PMID: 26067039 DOI: 10.1109/tuffc.2014.006910] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Ultrafast ultrasound is a promising imaging modality that enabled, inter alia, the development of pulse wave imaging and the local velocity estimation of the so-called pulse wave for a quantitative evaluation of arterial stiffness. However, this technique only focuses on the propagation of the axial displacement of the artery wall, and most techniques are not specific to the intima-media complex and do not take into account the longitudinal motion of this complex. Within this perspective, this paper presents a study of two-dimensional tissue motion estimation in ultrafast imaging combining transverse oscillations, which can improve motion estimation in the transverse direction, i.e., perpendicular to the beam axis, and a phase-based motion estimation. First, the method was validated in simulation. Two-dimensional motion, inspired from a real data set acquired on a human carotid artery, was applied to a numerical phantom to produce a simulation data set. The estimated motion showed axial and lateral mean errors of 4.2 ± 3.4 μm and 9.9 ± 7.9 μm, respectively. Afterward, experimental results were obtained on three artery phantoms with different wall stiffnesses. In this study, the vessel phantoms did not contain a pure longitudinal displacement. The longitudinal displacements were induced by the axial force produced by the wall's axial dilatation. This paper shows that the approach presented is able to perform 2-D tissue motion estimation very accurately even if the displacement values are very small and even in the lateral direction, making it possible to estimate the pulse wave velocity in both the axial and longitudinal directions. This demonstrates the method's potential to estimate the velocity of purely longitudinal waves propagating in the longitudinal direction. Finally, the stiffnesses of the three vessel phantom walls investigated were estimated with an average relative error of 2.2%.
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Cikes M, Tong L, Sutherland GR, D'hooge J. Ultrafast cardiac ultrasound imaging: technical principles, applications, and clinical benefits. JACC Cardiovasc Imaging 2015; 7:812-23. [PMID: 25124014 DOI: 10.1016/j.jcmg.2014.06.004] [Citation(s) in RCA: 109] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Accepted: 06/10/2014] [Indexed: 11/18/2022]
Abstract
Several recent technical advances in cardiac ultrasound allow data to be acquired at a very high frame rate. Retrospective gating, plane/diverging wave imaging, and multiline transmit imaging all improve the temporal resolution of the conventional ultrasound system. The main drawback of such high frame rate data acquisition is that it typically has reduced image quality. However, for given clinical applications, the acquisition of temporally-resolved data might outweigh the reduction in image quality. It is the aim of this paper to provide an overview of the technical principles behind these new ultrasound imaging modalities, to review the current evidence of their potential clinical added value, and to forecast how they might influence daily clinical practice.
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Affiliation(s)
- Maja Cikes
- Laboratory of Cardiovascular Imaging and Dynamics, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium; Department of Cardiovascular Diseases, University of Zagreb School of Medicine, University Hospital Center Zagreb, Zagreb, Croatia
| | - Ling Tong
- Laboratory of Cardiovascular Imaging and Dynamics, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - George R Sutherland
- Laboratory of Cardiovascular Imaging and Dynamics, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Jan D'hooge
- Laboratory of Cardiovascular Imaging and Dynamics, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium.
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Avdal J, Lovstakken L, Torp H. Effects of reverberations and clutter filtering in pulsed Doppler using sparse sequences. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2015; 62:828-838. [PMID: 25965677 DOI: 10.1109/tuffc.2014.006798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Duplex ultrasound is a modality in which an ultrasound system is used for simultaneous acquisition of both B-mode images and velocity (Doppler) data. Conventional duplex sequences interleave packets of B-mode and Doppler transmissions, producing undesirable gaps during B-mode interruptions. In recent years, several techniques have been proposed for avoiding such gaps by using sparse sequences, in which velocity spectra are generated from nonuniformly sampled Doppler data containing frequent B-mode interruptions. In this work, two negative effects are discussed that may influence velocity estimation when using nonuniformly sampled sequences. First, it is shown that long reverberation times lead to discontinuities in the signal from stationary clutter after each B-mode interruption. Second, using frequency analysis, it is shown that clutter filtering of nonuniformly sampled data may introduce artifacts in the velocity spectrum, and also lead to significant bias in mean velocity estimates. Methods are presented for quantification of these effects, and utilized to analyze three types of sparse duplex sequences for blood velocity estimation. In particular, it is argued that the use of such sequences in cardiac applications is not recommended because of long reverberation time. Additionally, it is found that the use of regression filters to filter nonuniformly sampled data may produce significant artifacts in pulsed wave Doppler spectra, but is less significant for color Doppler imaging applications. In vitro and in vivo examples are included showing the presence and magnitude of these problems in clinically relevant applications.
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Osmanski BF, Montaldo G, Tanter M. Out-of-plane Doppler imaging based on ultrafast plane wave imaging. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2015; 62:625-636. [PMID: 25881341 DOI: 10.1109/tuffc.2014.006575] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Retrieving the out-of-plane blood flow velocity vector from two-dimensional transverse acquisitions of large vessels could improve the quantification of flow rate and maximum speed. The in-plane vector flow component can be computed easily using the Doppler frequency shift. The main problem is estimating the angle between the probe imaging plane and the vessel axis to derive the out-of-plane component from in-plane measurements. In this article, we study the case in which the velocity vector can be decomposed on two directions: the out-of-plane direction and the in-plane depth direction. We explore the combination of a technique called intrinsic spectral broadening with ultrafast plane wave imaging to retrieve the out-of-plane component of the flow velocity vector. Using a one-time probe calibration of this intrinsic spectral broadening, out-of-plane angle and flow speed can be recovered easily, thus avoiding approximations of a complex theoretical analysis. For the calibration step, ultrafast plane wave imaging permits a fast calibration procedure for the Doppler intrinsic spectral broadening. In vitro experimental validations are performed on a homogeneous flow phantom and a Poiseuille flow; the absolute speed was retrieved with 6% error. The potential of the technique is demonstrated in vivo on the human carotid artery. Combined with in-plane vector flow approaches, this out-of-plane Doppler imaging method paves the way to threedimensional vector flow imaging using only conventional onedimensional probe technology.
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Gao H, Bijnens N, Coisne D, Lugiez M, Rutten M, D'hooge J. 2-D left ventricular flow estimation by combining speckle tracking with Navier-Stokes-based regularization: an in silico, in vitro and in vivo study. ULTRASOUND IN MEDICINE & BIOLOGY 2015; 41:99-113. [PMID: 25438850 DOI: 10.1016/j.ultrasmedbio.2014.08.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Revised: 08/19/2014] [Accepted: 08/24/2014] [Indexed: 06/04/2023]
Abstract
Despite the availability of multiple ultrasound approaches to left ventricular (LV) flow characterization in two dimensions, this technique remains in its childhood and further developments seem warranted. This article describes a new methodology for tracking the 2-D LV flow field based on ultrasound data. Hereto, a standard speckle tracking algorithm was modified by using a dynamic kernel embedding Navier-Stokes-based regularization in an iterative manner. The performance of the proposed approach was first quantified in synthetic ultrasound data based on a computational fluid dynamics model of LV flow. Next, an experimental flow phantom setup mimicking the normal human heart was used for experimental validation by employing simultaneous optical particle image velocimetry as a standard reference technique. Finally, the applicability of the approach was tested in a clinical setting. On the basis of the simulated data, pointwise evaluation of the estimated velocity vectors correlated well (mean r = 0.84) with the computational fluid dynamics measurement. During the filling period of the left ventricle, the properties of the main vortex obtained from the proposed method were also measured, and their correlations with the reference measurement were also calculated (radius, r = 0.96; circulation, r = 0.85; weighted center, r = 0.81). In vitro results at 60 bpm during one cardiac cycle confirmed that the algorithm properly measures typical characteristics of the vortex (radius, r = 0.60; circulation, r = 0.81; weighted center, r = 0.92). Preliminary qualitative results on clinical data revealed physiologic flow fields.
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Affiliation(s)
- Hang Gao
- Lab on Cardiovascular Imaging and Dynamics, KU Leuven, Leuven, Belgium.
| | - Nathalie Bijnens
- Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Damien Coisne
- University Hospital of Poitiers-Hospital of La Miletrie, Poitiers, France
| | | | - Marcel Rutten
- Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Jan D'hooge
- Lab on Cardiovascular Imaging and Dynamics, KU Leuven, Leuven, Belgium
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Osmanski BF, Maresca D, Messas E, Tanter M, Pernot M. Transthoracic ultrafast Doppler imaging of human left ventricular hemodynamic function. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2014; 61:1268-75. [PMID: 25073134 PMCID: PMC4878714 DOI: 10.1109/tuffc.2014.3033] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Heart diseases can affect intraventricular blood flow patterns. Real-time imaging of blood flow patterns is challenging because it requires both a high frame rate and a large field of view. To date, standard Doppler techniques can only perform blood flow estimation with high temporal resolution within small regions of interest. In this work, we used ultrafast imaging to map in 2-D human left ventricular blood flow patterns during the whole cardiac cycle. Cylindrical waves were transmitted at 4800 Hz with a transthoracic phased-array probe to achieve ultrafast Doppler imaging of the left ventricle. The high spatio-temporal sampling of ultrafast imaging permits reliance on a much more effective wall filtering and increased sensitivity when mapping blood flow patterns during the pre-ejection, ejection, early diastole, diastasis, and late diastole phases of the heart cycle. The superior sensitivity and temporal resolution of ultrafast Doppler imaging makes it a promising tool for the noninvasive study of intraventricular hemodynamic function.
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de Korte CL, Nillesen MM, Saris AECM, Lopata RGP, Thijssen JM, Kapusta L. New developments in paediatric cardiac functional ultrasound imaging. J Med Ultrason (2001) 2014; 41:279-90. [PMID: 27277901 DOI: 10.1007/s10396-013-0513-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Accepted: 11/15/2013] [Indexed: 11/26/2022]
Abstract
Ultrasound imaging can be used to estimate the morphology as well as the motion and deformation of tissues. If the interrogated tissue is actively deforming, this deformation is directly related to its function and quantification of this deformation is normally referred as 'strain imaging'. Tissue can also be deformed by applying an internal or external force and the resulting, induced deformation is a function of the mechanical tissue characteristics. In combination with the load applied, these strain maps can be used to estimate or reconstruct the mechanical properties of tissue. This technique was named 'elastography' by Ophir et al. in 1991. Elastography can be used for atherosclerotic plaque characterisation, while the contractility of the heart or skeletal muscles can be assessed with strain imaging. Rather than using the conventional video format (DICOM) image information, radio frequency (RF)-based ultrasound methods enable estimation of the deformation at higher resolution and with higher precision than commercial methods using Doppler (tissue Doppler imaging) or video image data (2D speckle tracking methods). However, the improvement in accuracy is mainly achieved when measuring strain along the ultrasound beam direction, so it has to be considered a 1D technique. Recently, this method has been extended to multiple directions and precision further improved by using spatial compounding of data acquired at multiple beam steered angles. Using similar techniques, the blood velocity and flow can be determined. RF-based techniques are also beneficial for automated segmentation of the ventricular cavities. In this paper, new developments in different techniques of quantifying cardiac function by strain imaging, automated segmentation, and methods of performing blood flow imaging are reviewed and their application in paediatric cardiology is discussed.
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Affiliation(s)
- Chris L de Korte
- Medical UltraSound Imaging Centre (766 MUSIC), Radboud University Medical Centre, Nijmegen, The Netherlands.
| | - Maartje M Nillesen
- Medical UltraSound Imaging Centre (766 MUSIC), Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Anne E C M Saris
- Medical UltraSound Imaging Centre (766 MUSIC), Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Richard G P Lopata
- Medical UltraSound Imaging Centre (766 MUSIC), Radboud University Medical Centre, Nijmegen, The Netherlands
- Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Johan M Thijssen
- Medical UltraSound Imaging Centre (766 MUSIC), Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Livia Kapusta
- Medical UltraSound Imaging Centre (766 MUSIC), Radboud University Medical Centre, Nijmegen, The Netherlands
- Tel Aviv Sorasky Medical Center (TASMC), Tel Aviv, Israel
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Osmanski B, Martin C, Montaldo G, Lanièce P, Pain F, Tanter M, Gurden H. Functional ultrasound imaging reveals different odor-evoked patterns of vascular activity in the main olfactory bulb and the anterior piriform cortex. Neuroimage 2014; 95:176-84. [DOI: 10.1016/j.neuroimage.2014.03.054] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Revised: 03/05/2014] [Accepted: 03/11/2014] [Indexed: 11/29/2022] Open
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Tanter M, Fink M. Ultrafast imaging in biomedical ultrasound. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2014. [PMID: 24402899 DOI: 10.1109/tuffc.2014.2882] [Citation(s) in RCA: 328] [Impact Index Per Article: 32.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Although the use of ultrasonic plane-wave transmissions rather than line-per-line focused beam transmissions has been long studied in research, clinical application of this technology was only recently made possible through developments in graphical processing unit (GPU)-based platforms. Far beyond a technological breakthrough, the use of plane or diverging wave transmissions enables attainment of ultrafast frame rates (typically faster than 1000 frames per second) over a large field of view. This concept has also inspired the emergence of completely novel imaging modes which are valuable for ultrasound-based screening, diagnosis, and therapeutic monitoring. In this review article, we present the basic principles and implementation of ultrafast imaging. In particular, present and future applications of ultrafast imaging in biomedical ultrasound are illustrated and discussed.
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