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Poimala J, Cox B, Hauptmann A. Compensating unknown speed of sound in learned fast 3D limited-view photoacoustic tomography. PHOTOACOUSTICS 2024; 37:100597. [PMID: 38425677 PMCID: PMC10901832 DOI: 10.1016/j.pacs.2024.100597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 08/15/2023] [Accepted: 02/16/2024] [Indexed: 03/02/2024]
Abstract
Real-time applications in three-dimensional photoacoustic tomography from planar sensors rely on fast reconstruction algorithms that assume the speed of sound (SoS) in the tissue is homogeneous. Moreover, the reconstruction quality depends on the correct choice for the constant SoS. In this study, we discuss the possibility of ameliorating the problem of unknown or heterogeneous SoS distributions by using learned reconstruction methods. This can be done by modelling the uncertainties in the training data. In addition, a correction term can be included in the learned reconstruction method. We investigate the influence of both and while a learned correction component can improve reconstruction quality further, we show that a careful choice of uncertainties in the training data is the primary factor to overcome unknown SoS. We support our findings with simulated and in vivo measurements in 3D.
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Affiliation(s)
- Jenni Poimala
- Research Unit of Mathematical Sciences, University of Oulu, Finland
| | - Ben Cox
- Department of Medical Physics and Biomedical Engineering, University College London, UK
| | - Andreas Hauptmann
- Research Unit of Mathematical Sciences, University of Oulu, Finland
- Department of Computer Science, University College London, UK
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2
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Yu Y, Feng T, Qiu H, Gu Y, Chen Q, Zuo C, Ma H. Simultaneous photoacoustic and ultrasound imaging: A review. ULTRASONICS 2024; 139:107277. [PMID: 38460216 DOI: 10.1016/j.ultras.2024.107277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 01/09/2024] [Accepted: 02/26/2024] [Indexed: 03/11/2024]
Abstract
Photoacoustic imaging (PAI) is an emerging biomedical imaging technique that combines the advantages of optical and ultrasound imaging, enabling the generation of images with both optical resolution and acoustic penetration depth. By leveraging similar signal acquisition and processing methods, the integration of photoacoustic and ultrasound imaging has introduced a novel hybrid imaging modality suitable for clinical applications. Photoacoustic-ultrasound imaging allows for non-invasive, high-resolution, and deep-penetrating imaging, providing a wealth of image information. In recent years, with the deepening research and the expanding biomedical application scenarios of photoacoustic-ultrasound bimodal systems, the immense potential of photoacoustic-ultrasound bimodal imaging in basic research and clinical applications has been demonstrated, with some research achievements already commercialized. In this review, we introduce the principles, technical advantages, and biomedical applications of photoacoustic-ultrasound bimodal imaging techniques, specifically focusing on tomographic, microscopic, and endoscopic imaging modalities. Furthermore, we discuss the future directions of photoacoustic-ultrasound bimodal imaging technology.
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Affiliation(s)
- Yinshi Yu
- Smart Computational Imaging Laboratory (SCILab), School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210094, China; Smart Computational Imaging Research Institute (SCIRI) of Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210019, China; Jiangsu Key Laboratory of Spectral Imaging & Intelligent Sense, Nanjing, Jiangsu Province 210094, China
| | - Ting Feng
- Academy for Engineering & Technology, Fudan University, Shanghai 200433,China.
| | - Haixia Qiu
- First Medical Center of PLA General Hospital, Beijing, China
| | - Ying Gu
- First Medical Center of PLA General Hospital, Beijing, China
| | - Qian Chen
- Smart Computational Imaging Laboratory (SCILab), School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210094, China; Smart Computational Imaging Research Institute (SCIRI) of Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210019, China; Jiangsu Key Laboratory of Spectral Imaging & Intelligent Sense, Nanjing, Jiangsu Province 210094, China
| | - Chao Zuo
- Smart Computational Imaging Laboratory (SCILab), School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210094, China; Smart Computational Imaging Research Institute (SCIRI) of Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210019, China; Jiangsu Key Laboratory of Spectral Imaging & Intelligent Sense, Nanjing, Jiangsu Province 210094, China.
| | - Haigang Ma
- Smart Computational Imaging Laboratory (SCILab), School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210094, China; Smart Computational Imaging Research Institute (SCIRI) of Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210019, China; Jiangsu Key Laboratory of Spectral Imaging & Intelligent Sense, Nanjing, Jiangsu Province 210094, China.
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3
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Nyayapathi N, Zheng E, Zhou Q, Doyley M, Xia J. Dual-modal Photoacoustic and Ultrasound Imaging: from preclinical to clinical applications. FRONTIERS IN PHOTONICS 2024; 5:1359784. [PMID: 39185248 PMCID: PMC11343488 DOI: 10.3389/fphot.2024.1359784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/27/2024]
Abstract
Photoacoustic imaging is a novel biomedical imaging modality that has emerged over the recent decades. Due to the conversion of optical energy into the acoustic wave, photoacoustic imaging offers high-resolution imaging in depth beyond the optical diffusion limit. Photoacoustic imaging is frequently used in conjunction with ultrasound as a hybrid modality. The combination enables the acquisition of both optical and acoustic contrasts of tissue, providing functional, structural, molecular, and vascular information within the same field of view. In this review, we first described the principles of various photoacoustic and ultrasound imaging techniques and then classified the dual-modal imaging systems based on their preclinical and clinical imaging applications. The advantages of dual-modal imaging were thoroughly analyzed. Finally, the review ends with a critical discussion of existing developments and a look toward the future.
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Affiliation(s)
- Nikhila Nyayapathi
- Electrical and Computer Engineering, University of Rochester, Rochester, New York, 14627
| | - Emily Zheng
- Department of Biomedical Engineering, University at Buffalo, Buffalo, New York, 14226
| | - Qifa Zhou
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90007
| | - Marvin Doyley
- Electrical and Computer Engineering, University of Rochester, Rochester, New York, 14627
| | - Jun Xia
- Department of Biomedical Engineering, University at Buffalo, Buffalo, New York, 14226
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4
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Tarvainen T, Cox B. Quantitative photoacoustic tomography: modeling and inverse problems. JOURNAL OF BIOMEDICAL OPTICS 2024; 29:S11509. [PMID: 38125717 PMCID: PMC10731766 DOI: 10.1117/1.jbo.29.s1.s11509] [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: 09/20/2023] [Revised: 11/19/2023] [Accepted: 11/28/2023] [Indexed: 12/23/2023]
Abstract
Significance Quantitative photoacoustic tomography (QPAT) exploits the photoacoustic effect with the aim of estimating images of clinically relevant quantities related to the tissue's optical absorption. The technique has two aspects: an acoustic part, where the initial acoustic pressure distribution is estimated from measured photoacoustic time-series, and an optical part, where the distributions of the optical parameters are estimated from the initial pressure. Aim Our study is focused on the optical part. In particular, computational modeling of light propagation (forward problem) and numerical solution methodologies of the image reconstruction (inverse problem) are discussed. Approach The commonly used mathematical models of how light and sound propagate in biological tissue are reviewed. A short overview of how the acoustic inverse problem is usually treated is given. The optical inverse problem and methods for its solution are reviewed. In addition, some limitations of real-life measurements and their effect on the inverse problems are discussed. Results An overview of QPAT with a focus on the optical part was given. Computational modeling and inverse problems of QPAT were addressed, and some key challenges were discussed. Furthermore, the developments for tackling these problems were reviewed. Although modeling of light transport is well-understood and there is a well-developed framework of inverse mathematics for approaching the inverse problem of QPAT, there are still challenges in taking these methodologies to practice. Conclusions Modeling and inverse problems of QPAT together were discussed. The scope was limited to the optical part, and the acoustic aspects were discussed only to the extent that they relate to the optical aspect.
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Affiliation(s)
- Tanja Tarvainen
- University of Eastern Finland, Department of Technical Physics, Kuopio, Finland
| | - Ben Cox
- University College London, Department of Medical Physics and Biomedical Engineering, London, United Kingdom
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5
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Riksen JJM, Nikolaev AV, van Soest G. Photoacoustic imaging on its way toward clinical utility: a tutorial review focusing on practical application in medicine. JOURNAL OF BIOMEDICAL OPTICS 2023; 28:121205. [PMID: 37304059 PMCID: PMC10249868 DOI: 10.1117/1.jbo.28.12.121205] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 05/12/2023] [Accepted: 05/18/2023] [Indexed: 06/13/2023]
Abstract
Significance Photoacoustic imaging (PAI) enables the visualization of optical contrast with ultrasonic imaging. It is a field of intense research, with great promise for clinical application. Understanding the principles of PAI is important for engineering research and image interpretation. Aim In this tutorial review, we lay out the imaging physics, instrumentation requirements, standardization, and some practical examples for (junior) researchers, who have an interest in developing PAI systems and applications for clinical translation or applying PAI in clinical research. Approach We discuss PAI principles and implementation in a shared context, emphasizing technical solutions that are amenable to broad clinical deployment, considering factors such as robustness, mobility, and cost in addition to image quality and quantification. Results Photoacoustics, capitalizing on endogenous contrast or administered contrast agents that are approved for human use, yields highly informative images in clinical settings, which can support diagnosis and interventions in the future. Conclusion PAI offers unique image contrast that has been demonstrated in a broad set of clinical scenarios. The transition of PAI from a "nice-to-have" to a "need-to-have" modality will require dedicated clinical studies that evaluate therapeutic decision-making based on PAI and consideration of the actual value for patients and clinicians, compared with the associated cost.
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Affiliation(s)
- Jonas J. M. Riksen
- Erasmus University Medical Center, Department of Cardiology, Rotterdam, The Netherlands
| | - Anton V. Nikolaev
- Erasmus University Medical Center, Department of Cardiology, Rotterdam, The Netherlands
| | - Gijs van Soest
- Erasmus University Medical Center, Department of Cardiology, Rotterdam, The Netherlands
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6
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Zhang Y, Wang L. Adaptive dual-speed ultrasound and photoacoustic computed tomography. PHOTOACOUSTICS 2022; 27:100380. [PMID: 35722271 PMCID: PMC9198371 DOI: 10.1016/j.pacs.2022.100380] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 06/06/2022] [Accepted: 06/07/2022] [Indexed: 06/15/2023]
Abstract
Full-ring dual-modal ultrasound and photoacoustic computed tomography has unique advantages of nearly isotropic spatial resolution, complementary contrast, deep penetration, and full-view detection. However, the imaging quality may be deteriorated by the inaccurate sound speed estimation. Automatic determining and compensation for sound speed has been a long-standing problem in image reconstruction. Here, we present new adaptive dual-speed ultrasound and photoacoustic computed tomography (ADS-USPACT) to address this challenge. The system features full-view coverage (360°), high-speed dual-modal imaging (10-Hz), automated dual sound speed correction, and synergistic high imaging quality. To correct the sound speed, we develop a two-compartment method that can automatically segment the sample boundary and search for the optimal sound speed based on the rich ultrasonic pulse-echo signals. The method does not require the operator's intervention. We validate this technique in numerical simulation, phantom study, and in vivo experiments. The ADS-USPACT represents significant progress in dual-modal imaging.
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Affiliation(s)
- Yachao Zhang
- City University of Hong Kong, Department of Biomedical Engineering, Kowloon, Hong Kong SAR, China
| | - Lidai Wang
- City University of Hong Kong, Department of Biomedical Engineering, Kowloon, Hong Kong SAR, China
- City University of Hong Kong, Shenzhen Research Institute, Shenzhen, China
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7
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Understanding Breast Cancers through Spatial and High-Resolution Visualization Using Imaging Technologies. Cancers (Basel) 2022; 14:cancers14174080. [PMID: 36077616 PMCID: PMC9454728 DOI: 10.3390/cancers14174080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 08/12/2022] [Accepted: 08/18/2022] [Indexed: 11/17/2022] Open
Abstract
Breast cancer is the most common cancer affecting women worldwide. Although many analyses and treatments have traditionally targeted the breast cancer cells themselves, recent studies have focused on investigating entire cancer tissues, including breast cancer cells. To understand the structure of breast cancer tissues, including breast cancer cells, it is necessary to investigate the three-dimensional location of the cells and/or proteins comprising the tissues and to clarify the relationship between the three-dimensional structure and malignant transformation or metastasis of breast cancers. In this review, we aim to summarize the methods for analyzing the three-dimensional structure of breast cancer tissue, paying particular attention to the recent technological advances in the combination of the tissue-clearing method and optical three-dimensional imaging. We also aimed to identify the latest methods for exploring the relationship between the three-dimensional cell arrangement in breast cancer tissues and the gene expression of each cell. Finally, we aimed to describe the three-dimensional imaging features of breast cancer tissues using noninvasive photoacoustic imaging methods.
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8
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Jiang D, Lan H, Wang Y, Shen Y, Gao F, Gao F. Programmable Acoustic Delay-Line Enabled Low-Cost Photoacoustic Tomography System. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2022; 69:2075-2084. [PMID: 35412979 DOI: 10.1109/tuffc.2022.3166841] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Photoacoustic tomography (PAT) is an emerging technology for biomedical imaging that combines the superiorities of high optical contrast and acoustic penetration. In the PAT system, more PA signals are preferred to be detected from full field of view to reconstruct the PA images with higher fidelity. However, the requirement for more PA signals' detection leads to more time consumption for single-channel scanning-based PAT system or higher cost of data acquisition (DAQ) module for an array-based PAT system. To address this issue, we proposed a programmable acoustic delay-line (PADL) module to reduce DAQ cost and accelerate imaging speed for PAT system. The module is based on bidirectional conversion between acoustic signals and electrical signals, including ultrasound transmission in between to provide sufficient time delay. The acoustic delay-line module achieves tens or hundreds of microseconds' delay for each channel and is controlled by a programmable control unit. In this work, it achieves to merge four inputs of PA signals into one output signal, which can be recovered into original four PA signals in the digital domain after DAQ. The imaging experiments of pencil leads embedded in agar phantom are conducted by the PAT system equipped with the proposed PADL module, which demonstrated its feasibility to reduce the cost of the PAT system. An in vivo study of human finger PAT imaging with delay-line module verified its feasibility for biomedical imaging applications.
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9
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Na S, Wang LV. Photoacoustic computed tomography for functional human brain imaging [Invited]. BIOMEDICAL OPTICS EXPRESS 2021; 12:4056-4083. [PMID: 34457399 PMCID: PMC8367226 DOI: 10.1364/boe.423707] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 06/05/2021] [Accepted: 06/08/2021] [Indexed: 05/02/2023]
Abstract
The successes of magnetic resonance imaging and modern optical imaging of human brain function have stimulated the development of complementary modalities that offer molecular specificity, fine spatiotemporal resolution, and sufficient penetration simultaneously. By virtue of its rich optical contrast, acoustic resolution, and imaging depth far beyond the optical transport mean free path (∼1 mm in biological tissues), photoacoustic computed tomography (PACT) offers a promising complementary modality. In this article, PACT for functional human brain imaging is reviewed in its hardware, reconstruction algorithms, in vivo demonstration, and potential roadmap.
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Affiliation(s)
- Shuai Na
- Caltech Optical Imaging Laboratory, Andrew
and Peggy Cherng Department of Medical Engineering,
California Institute of Technology, 1200
East California Boulevard, Pasadena, CA 91125, USA
| | - Lihong V. Wang
- Caltech Optical Imaging Laboratory, Andrew
and Peggy Cherng Department of Medical Engineering,
California Institute of Technology, 1200
East California Boulevard, Pasadena, CA 91125, USA
- Caltech Optical Imaging Laboratory,
Department of Electrical Engineering, California
Institute of Technology, 1200 East California Boulevard,
Pasadena, CA 91125, USA
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10
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Cui M, Zuo H, Wang X, Deng K, Luo J, Ma C. Adaptive photoacoustic computed tomography. PHOTOACOUSTICS 2021; 21:100223. [PMID: 33364162 PMCID: PMC7750694 DOI: 10.1016/j.pacs.2020.100223] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 11/05/2020] [Accepted: 11/12/2020] [Indexed: 05/18/2023]
Abstract
For many optical imaging modalities, image qualities are inevitably degraded by wavefront distortions caused by varying light speed. In optical microscopy and astronomy, adaptive optics (AO) has long been applied to compensate for such unwanted aberrations. Photoacoustic computed tomography (PACT), despite relying on the ultrasonic wave for image formation, suffers from the acoustic version of the same problem. However, this problem has traditionally been regarded as an inverse problem of jointly reconstructing both the initial pressure and the sound speed distributions. In this work, we proposed a method similar to indirect wavefront sensing in AO. We argued that wavefront distortions can be extracted and corrected by a frequency domain analysis of local images. In addition to an adaptively reconstructed aberration-free image, the speed of sound map can be subsequently estimated. We demonstrated the method by in silico, phantom, and in vivo experiments.
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Affiliation(s)
- Manxiu Cui
- Department of Electronic Engineering, Tsinghua University, Beijing, 100084, China
| | - Hongzhi Zuo
- Department of Electronic Engineering, Tsinghua University, Beijing, 100084, China
| | - Xunahao Wang
- Department of Electronic Engineering, Tsinghua University, Beijing, 100084, China
| | - Kexin Deng
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Jianwen Luo
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Cheng Ma
- Department of Electronic Engineering, Tsinghua University, Beijing, 100084, China
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11
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Tian C, Zhang C, Zhang H, Xie D, Jin Y. Spatial resolution in photoacoustic computed tomography. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2021; 84:036701. [PMID: 33434890 DOI: 10.1088/1361-6633/abdab9] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 01/12/2021] [Indexed: 06/12/2023]
Abstract
Photoacoustic computed tomography (PACT) is a novel biomedical imaging modality and has experienced fast developments in the past two decades. Spatial resolution is an important criterion to measure the imaging performance of a PACT system. Here we survey state-of-the-art literature on the spatial resolution of PACT and analyze resolution degradation models from signal generation, propagation, reception, to image reconstruction. Particularly, the impacts of laser pulse duration, acoustic attenuation, acoustic heterogeneity, detector bandwidth, detector aperture, detector view angle, signal sampling, and image reconstruction algorithms are reviewed and discussed. Analytical expressions of point spread functions related to these impacting factors are summarized based on rigorous mathematical formulas. State-of-the-art approaches devoted to enhancing spatial resolution are also reviewed. This work is expected to elucidate the concept of spatial resolution in PACT and inspire novel image quality enhancement techniques.
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Affiliation(s)
- Chao Tian
- Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
- Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Chenxi Zhang
- Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
- Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Haoran Zhang
- Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
- Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Dan Xie
- Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
- Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Yi Jin
- Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
- Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
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12
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Jiang Y, Peng C, Zhu Y, Ma X, Xu G, Yuan J, Wang X, Carson P. Biomedical Photoacoustic Imaging With Unknown Spatially Distributed Ultrasound Sensor Array. IEEE Trans Biomed Eng 2021; 68:2948-2956. [PMID: 33534699 DOI: 10.1109/tbme.2021.3056715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE With the growth of interest in different medical study on biological function, non-invasive photoacoustic imaging of biological tissue attracts the interests for researchers. To eliminate the limited angle effect of photoacoustic imaging based on ultrasound linear array, spatially distributed ultrasound sensor array is applied. The accurate sensor array position determines the quality of the imaging results. In this study, we proposed three methods based on photoacoustic and ultrasound signals to enhance the imaging quality using a 256-element full-ring array. METHODS Groups of photoacoustic and ultrasound signals are used to regress the position of each element sensor. RESULT In phantom study and mouse brain study, photoacoustic imaging results can both yield details clearly with average error rate of less than 1% (50 [Formula: see text]). CONCLUSION The performance of our three methods have proved that they can be potentially applied to other ultrasound-based medical imaging studies with unknown distributed positions of sensor array to enhance the imaging quality. SIGNIFICANCE The proposed methods can contribute to precise biomedical imaging with unknown distributed positions of sensor array in different application scenarios.
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13
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Hosseinaee Z, Le M, Bell K, Reza PH. Towards non-contact photoacoustic imaging [review]. PHOTOACOUSTICS 2020; 20:100207. [PMID: 33024694 PMCID: PMC7530308 DOI: 10.1016/j.pacs.2020.100207] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 06/29/2020] [Accepted: 07/10/2020] [Indexed: 05/06/2023]
Abstract
Photoacoustic imaging (PAI) takes advantage of both optical and ultrasound imaging properties to visualize optical absorption with high resolution and contrast. Photoacoustic microscopy (PAM) is usually categorized with all-optical microscopy techniques such as optical coherence tomography or confocal microscopes. Despite offering high sensitivity, novel imaging contrast, and high resolution, PAM is not generally an all-optical imaging method unlike the other microscopy techniques. One of the significant limitations of photoacoustic microscopes arises from their need to be in physical contact with the sample through a coupling media. This physical contact, coupling, or immersion of the sample is undesirable or impractical for many clinical and pre-clinical applications. This also limits the flexibility of photoacoustic techniques to be integrated with other all-optical imaging microscopes for providing complementary imaging contrast. To overcome these limitations, several non-contact photoacoustic signal detection approaches have been proposed. This paper presents a brief overview of current non-contact photoacoustic detection techniques with an emphasis on all-optical detection methods and their associated physical mechanisms.
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Affiliation(s)
- Zohreh Hosseinaee
- PhotoMedicine Labs, Department of System Design Engineering, University of Waterloo, Ontario, N2L 3G1, Canada
| | - Martin Le
- PhotoMedicine Labs, Department of System Design Engineering, University of Waterloo, Ontario, N2L 3G1, Canada
| | - Kevan Bell
- PhotoMedicine Labs, Department of System Design Engineering, University of Waterloo, Ontario, N2L 3G1, Canada
- IllumiSonics Inc., Department of Systems Design Engineering, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada
| | - Parsin Haji Reza
- PhotoMedicine Labs, Department of System Design Engineering, University of Waterloo, Ontario, N2L 3G1, Canada
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14
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Awasthi N, Jain G, Kalva SK, Pramanik M, Yalavarthy PK. Deep Neural Network-Based Sinogram Super-Resolution and Bandwidth Enhancement for Limited-Data Photoacoustic Tomography. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2020; 67:2660-2673. [PMID: 32142429 DOI: 10.1109/tuffc.2020.2977210] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Photoacoustic tomography (PAT) is a noninvasive imaging modality combining the benefits of optical contrast at ultrasonic resolution. Analytical reconstruction algorithms for photoacoustic (PA) signals require a large number of data points for accurate image reconstruction. However, in practical scenarios, data are collected using the limited number of transducers along with data being often corrupted with noise resulting in only qualitative images. Furthermore, the collected boundary data are band-limited due to limited bandwidth (BW) of the transducer, making the PA imaging with limited data being qualitative. In this work, a deep neural network-based model with loss function being scaled root-mean-squared error was proposed for super-resolution, denoising, as well as BW enhancement of the PA signals collected at the boundary of the domain. The proposed network has been compared with traditional as well as other popular deep-learning methods in numerical as well as experimental cases and is shown to improve the collected boundary data, in turn, providing superior quality reconstructed PA image. The improvement obtained in the Pearson correlation, structural similarity index metric, and root-mean-square error was as high as 35.62%, 33.81%, and 41.07%, respectively, for phantom cases and signal-to-noise ratio improvement in the reconstructed PA images was as high as 11.65 dB for in vivo cases compared with reconstructed image obtained using original limited BW data. Code is available at https://sites.google.com/site/sercmig/home/dnnpat.
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15
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Yang H, Jüstel D, Prakash J, Karlas A, Helfen A, Masthoff M, Wildgruber M, Ntziachristos V. Soft ultrasound priors in optoacoustic reconstruction: Improving clinical vascular imaging. PHOTOACOUSTICS 2020; 19:100172. [PMID: 32280585 PMCID: PMC7139114 DOI: 10.1016/j.pacs.2020.100172] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 02/24/2020] [Accepted: 02/26/2020] [Indexed: 05/06/2023]
Abstract
Using the same ultrasound detector, hybrid optoacoustic-ultrasound (OPUS) imaging provides concurrent scans of tissue slices or volumes and visualizes complementary sound- and light-based contrast at similar resolutions. In addition to the benefit of hybrid contrast, spatial co-registration enables images from one modality to be employed as prior information for improving an aspect of the performance of the other modality. We consider herein a handheld OPUS system and utilize structural information from ultrasound images to guide regional Laplacian regularization-based reconstruction of optoacoustic images. Using phantoms and data from OPUS scans of human radial and carotid arteries, we show that ultrasound-driven optoacoustic inversion reduces limited-view artefacts and improves image contrast. In phantoms, prior-integrated reconstruction leads to a 50 % higher contrast-to-noise ratio (CNR) of the image than standard reconstruction, and a 17 % higher structural similarity (SSIM) index. In clinical data, prior-integrated reconstruction detects deep-seated radial arteries with higher CNR than the standard method at three different depths. In this way, the prior-integrated method offers unique insights into atherosclerotic carotid plaques in humans (with p<0.01 between patients and healthy volunteers), potentially paving the way for new abilities in vascular imaging and more generally in optoacoustic imaging.
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Affiliation(s)
- Hong Yang
- Institute of Biological and Medical Imaging (IBMI), Helmholtz Zentrum München, Ingolstädter Landstr. 1, D-85764, Neuherberg, Germany
- Chair of Biological Imaging and TranslaTUM, Technical University of Munich, Ismaninger Str. 22, 81675, München, Germany
| | - Dominik Jüstel
- Institute of Biological and Medical Imaging (IBMI), Helmholtz Zentrum München, Ingolstädter Landstr. 1, D-85764, Neuherberg, Germany
- Chair of Biological Imaging and TranslaTUM, Technical University of Munich, Ismaninger Str. 22, 81675, München, Germany
| | - Jaya Prakash
- Dept. of Instrumentation and Applied Physics, Indian Institute of Science, C. V. Raman Road, 560012, Bangalore, India
| | - Angelos Karlas
- Institute of Biological and Medical Imaging (IBMI), Helmholtz Zentrum München, Ingolstädter Landstr. 1, D-85764, Neuherberg, Germany
- Chair of Biological Imaging and TranslaTUM, Technical University of Munich, Ismaninger Str. 22, 81675, München, Germany
- Clinic for Vascular and Endovascular Surgery, Klinikum rechts der Isar, Ismaninger Str. 22, D-81675, München, Germany
| | - Anne Helfen
- Department of Clinical Radiology, University Hospital Muenster, Albert-Schweitzer-Campus 1, A16, 49149, Muenster, Germany
| | - Max Masthoff
- Department of Clinical Radiology, University Hospital Muenster, Albert-Schweitzer-Campus 1, A16, 49149, Muenster, Germany
| | - Moritz Wildgruber
- Department of Clinical Radiology, University Hospital Muenster, Albert-Schweitzer-Campus 1, A16, 49149, Muenster, Germany
- Klinik und Poliklinik für Radiologie, Klinikum der Universität München, Munich, Germany
| | - Vasilis Ntziachristos
- Institute of Biological and Medical Imaging (IBMI), Helmholtz Zentrum München, Ingolstädter Landstr. 1, D-85764, Neuherberg, Germany
- Chair of Biological Imaging and TranslaTUM, Technical University of Munich, Ismaninger Str. 22, 81675, München, Germany
- Corresponding author at: Institute of Biological and Medical Imaging (IBMI), Helmholtz Zentrum München, Ingolstädter Landstr. 1, D-85764, Neuherberg, Germany.
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16
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Rajendran P, Sahu S, Dienzo RA, Pramanik M. In vivo detection of venous sinus distension due to intracranial hypotension in small animal using pulsed-laser-diode photoacoustic tomography. JOURNAL OF BIOPHOTONICS 2020; 13:e201960162. [PMID: 32030895 DOI: 10.1002/jbio.201960162] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Revised: 12/18/2019] [Accepted: 02/01/2020] [Indexed: 05/24/2023]
Abstract
Intracranial hypotension (IH) is a pathophysiological condition of reduced intracranial pressure caused by low cerebrospinal fluid (CSF) volume due to dural injuries from lumbar puncture, surgery, or trauma. Understanding the prognosis of IH in small animal models is important to gain insights on the complications associated with it such as orthostatic headache, cerebral venous thrombosis, coma, and so forth. Photoacoustic tomography (PAT) offers a novel and cost-effective way to perceive and detect IH in small animal models. In this study, a pulsed laser diode (PLD)-based PAT imaging system was used to examine the changes in the venous sinuses of the rat brain due to IH, induced through CSF extraction. After the CSF extraction, an increase in the sagittal sinus area by ~30% and width by 40% ± 5% was observed. These results provide supportive evidence that the PLD-PAT can be employed for detecting changes in sagittal sinus due to IH in rat model.
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Affiliation(s)
- Praveenbalaji Rajendran
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang drive, Singapore, Singapore
| | - Samiran Sahu
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang drive, Singapore, Singapore
| | - Rhonnie Austria Dienzo
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang drive, Singapore, Singapore
| | - Manojit Pramanik
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang drive, Singapore, Singapore
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17
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Yin J, He J, Tao C, Liu X. Enhancement of photoacoustic tomography of acoustically inhomogeneous tissue by utilizing a memory effect. OPTICS EXPRESS 2020; 28:10806-10817. [PMID: 32403604 DOI: 10.1364/oe.388902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 03/18/2020] [Indexed: 06/11/2023]
Abstract
One of the major challenges for photoacoustic tomography is the variance of the speed of sound (SOS) in realistic tissue, which could lead to defocusing in image reconstruction and degrade the reconstructed image. In this study, we propose a method to optimize the SOS used for image reconstruction based on a memory effect of photoacoustic signal. We reveal that the photoacoustic signals received by two adjacent transducers have a high degree of similarity in waveform, while a time delay exists between them. The time delay is related to the SOS. Based on this physical phenomenon, an iterative operation is implemented to estimate the SOS used for image reconstruction. Both simulations and experiments confirm that the method significantly enhances the reconstructed image in inhomogeneous tissue. This study may have potential value in improving the performance of photoacoustic tomography in biomedical applications.
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18
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Tick J, Pulkkinen A, Tarvainen T. Modelling of errors due to speed of sound variations in photoacoustic tomography using a Bayesian framework. Biomed Phys Eng Express 2019; 6:015003. [PMID: 33438591 DOI: 10.1088/2057-1976/ab57d1] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Inverse problem of estimating initial pressure in photoacoustic tomography is ill-posed and thus sensitive to errors in modelling and measurements. In practical experiments, accurate knowledge of the speed of sound of the imaged target is commonly not available, and therefore an approximate speed of sound is used in the computational model. This can result in errors in the solution of the inverse problem that can appear as artefacts in the reconstructed images. In this paper, the inverse problem of photoacoustic tomography is approached in a Bayesian framework. Errors due to uncertainties in the speed of sound are modelled using Bayesian approximation error modelling. Estimation of the initial pressure distribution together with information on the reliability of these estimates are considered. The approach was studied using numerical simulations. The results show that uncertainties in the speed of sound can cause significant errors in the solution of the inverse problem. However, modelling of these uncertainties improves the accuracy of the solution.
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Affiliation(s)
- Jenni Tick
- Department of Applied Physics, University of Eastern Finland, PO Box 1627, 70211 Kuopio, Finland
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19
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Nyayapathi N, Xia J. Photoacoustic imaging of breast cancer: a mini review of system design and image features. JOURNAL OF BIOMEDICAL OPTICS 2019; 24:1-13. [PMID: 31677256 PMCID: PMC7005545 DOI: 10.1117/1.jbo.24.12.121911] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 10/14/2019] [Indexed: 05/03/2023]
Abstract
Breast cancer is one of the leading causes for cancer related deaths in women, and early detection is extremely important to improve survival rates. Currently, x-ray mammogram is the only modality for mass screening of asymptomatic women. However, it has decreased sensitivity in radiographically dense breasts, which is also associated with a higher risk for breast cancer. Photoacoustic (PA) imaging is an emerging modality that enables deep tissue imaging of optical contrast at ultrasonically defined spatial resolution, which is much higher than that can be achieved in purely optical imaging modalities. Because of high optical absorption from hemoglobin molecules, PA imaging can map out hemo distribution and dynamics in breast tissue and identify malignant lesions based on tumor associated angiogenesis and hypoxia. We review various PA breast imaging systems proposed over the past few years and summarize the PA features of breast cancer identified in these systems.
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Affiliation(s)
- Nikhila Nyayapathi
- University at Buffalo, The State University of New York, Department of Biomedical Engineering, Buffalo, New York, United States
- University at Buffalo, The State University of New York, Department of Electrical Engineering, Buffalo, New York, United States
| | - Jun Xia
- University at Buffalo, The State University of New York, Department of Biomedical Engineering, Buffalo, New York, United States
- Address all correspondence to Jun Xia, E-mail:
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20
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Nishiyama M, Namita T, Kondo K, Yamakawa M, Shiina T. Ring-array photoacoustic tomography for imaging human finger vasculature. JOURNAL OF BIOMEDICAL OPTICS 2019; 24:1-12. [PMID: 31535539 PMCID: PMC6997662 DOI: 10.1117/1.jbo.24.9.096005] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Accepted: 08/20/2019] [Indexed: 05/22/2023]
Abstract
For early diagnosis of rheumatoid arthritis (RA), it is important to visualize its potential marker, vascularization in the synovial membrane of the finger joints. Photoacoustic (PA) imaging, which can image blood vessels at high contrast and resolution, is expected to be a potential modality for earlier diagnosis of RA. In previous studies of PA finger imaging, different acoustic schemes, such as linear-shaped arrays, have been utilized, but these have limited detection views, rendering inaccurate reconstruction, and most of them require rotational detection. We are developing a PA system for finger vascular imaging using a ring-shaped array ultrasound (US) transducer. By designing the ring-array sensor based on simulations, using phantom experiments, it was demonstrated that we have created a system that can image small objects around 0.1 to 0.5 mm in diameter. The full width at half maximum of the slice direction of the system was within 2 mm and corresponded to that of the simulation. Moreover, we could clearly visualize healthy index finger vasculature and the location of the distal interphalangeal and proximal interphalangeal joints by PA and US echo images. In the future, this system could be used as a method for visualizing the three-dimensional vascularization of RA patients’ fingers.
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Affiliation(s)
- Misaki Nishiyama
- Kyoto University, Graduate School of Medicine, Department of Human Health Sciences, Kyoto, Japan
- Address all correspondence to Misaki Nishiyama, E-mail:
| | - Takeshi Namita
- Kyoto University, Graduate School of Medicine, Department of Human Health Sciences, Kyoto, Japan
| | - Kengo Kondo
- Kyoto University, Graduate School of Medicine, Department of Human Health Sciences, Kyoto, Japan
| | - Makoto Yamakawa
- Kyoto University, Graduate School of Medicine, Department of Human Health Sciences, Kyoto, Japan
| | - Tsuyoshi Shiina
- Kyoto University, Graduate School of Medicine, Department of Human Health Sciences, Kyoto, Japan
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21
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Cai C, Wang X, Si K, Qian J, Luo J, Ma C. Feature coupling photoacoustic computed tomography for joint reconstruction of initial pressure and sound speed in vivo. BIOMEDICAL OPTICS EXPRESS 2019; 10:3447-3462. [PMID: 31467789 PMCID: PMC6706027 DOI: 10.1364/boe.10.003447] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 05/14/2019] [Accepted: 06/06/2019] [Indexed: 05/06/2023]
Abstract
Photoacoustic imaging relies on diffused photons for optical contrast and diffracted ultrasound for high resolution. As a tomographic imaging modality, often an inverse problem of acoustic diffraction needs to be solved to reconstruct a photoacoustic image. The inverse problem is complicated by the fact that the acoustic properties, including the speed of sound distribution, in the image field of view are unknown. During reconstruction, subtle changes of the speed of sound in the acoustic ray path may accumulate and give rise to noticeable blurring in the image. Thus, in addition to the ultrasound detection bandwidth, inaccurate acoustic modeling, especially the unawareness of the speed of sound, defines the image resolution and influences image quantification. Here, we proposed a method termed feature coupling to jointly reconstruct the speed of sound distribution and a photoacoustic image with improved sharpness, at no additional hardware cost. Simulations, phantom studies, and in vivo experiments demonstrated the effectiveness and reliability of our method.
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Affiliation(s)
- Chuangjian Cai
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing 100084, China
- These authors contribute equally
| | - Xuanhao Wang
- Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
- These authors contribute equally
| | - Ke Si
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
- Center for Neuroscience, Department of Neurobiology, NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Jun Qian
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Jianwen Luo
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing 100084, China
| | - Cheng Ma
- Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
- Beijing National Research Center for Information Science and Technology, Beijing 100084, China
- Beijing Innovation Center for Future Chip, Beijing 100084, China
- State Key Laboratory on Integrated Optoelectronics, Tsinghua University, Beijing 100084, China
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22
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Zheng S, Yixuan J. An image reconstruction method for endoscopic photoacoustic tomography in tissues with heterogeneous sound speed. Comput Biol Med 2019; 110:15-28. [PMID: 31103813 DOI: 10.1016/j.compbiomed.2019.05.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 05/05/2019] [Accepted: 05/08/2019] [Indexed: 11/25/2022]
Abstract
The idealized assumption of a constant speed of sound (SOS) in acoustically inhomogeneous biological tissues usually results in blurred details, acoustic distortion and artifacts in in vivo endoscopic photoacoustic tomographic (EPAT) images. In this paper, we propose an image reconstruction method to improve EPAT imaging for luminal structures with the variable SOS. In our method, an optimal SOS providing the maximal local focusing of a measuring location within the imaging region is firstly determined. The deviation in the ultrasonic propagation time caused by the variable SOS is then compensated. The grayscale images of the optical absorption distribution on the cross-sections of the luminal structures are finally reconstructed with a filtered back-projection (FBP) algorithm based on the corrected propagation time. Any prior knowledge of the SOS distribution in the imaged tissues is not required. The results of numerical simulation experiments demonstrated that the proposed method can effectively improve the image quality by reducing the misalignment of tissues, acoustic distortion and artifacts caused by the variable SOS.
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Affiliation(s)
- Sun Zheng
- Department of Electronic and Communication Engineering, North China Electric Power University, Baoding, 071003, China.
| | - Jia Yixuan
- Department of Electronic and Communication Engineering, North China Electric Power University, Baoding, 071003, China
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23
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Colchester RJ, Little C, Dwyer G, Noimark S, Alles EJ, Zhang EZ, Loder CD, Parkin IP, Papakonstantinou I, Beard PC, Finlay MC, Rakhit RD, Desjardins AE. All-Optical Rotational Ultrasound Imaging. Sci Rep 2019; 9:5576. [PMID: 30944379 PMCID: PMC6447544 DOI: 10.1038/s41598-019-41970-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 03/14/2019] [Indexed: 11/23/2022] Open
Abstract
Miniaturised high-resolution imaging devices are valuable for guiding minimally invasive procedures such as vascular stent placements. Here, we present all-optical rotational B-mode pulse-echo ultrasound imaging. With this device, ultrasound transmission and reception are performed with light. The all-optical transducer in the probe comprised an optical fibre that delivered pulsed excitation light to an optical head at the distal end with a multi-walled carbon nanotube and polydimethylsiloxane composite coating. This coating was photoacoustically excited to generate a highly directional ultrasound beam perpendicular to the optical fibre axis. A concave Fabry-Pérot cavity at the distal end of an optical fibre, which was interrogated with a tuneable continuous-wave laser, served as an omnidirectional ultrasound receiver. The transmitted ultrasound had a -6 dB bandwidth of 31.3 MHz and a peak-to-peak pressure of 1.87 MPa, as measured at 1.5 mm from the probe. The receiver had a noise equivalent pressure <100 Pa over a 20 MHz bandwidth. With a maximum outer probe diameter of 1.25 mm, the probe provided imaging with an axial resolution better than 50 µm, and a real-time imaging rate of 5 frames per second. To investigate the capabilities of the probe, intraluminal imaging was performed in healthy swine carotid arteries. The results demonstrate that the all-optical probe is viable for clinical rotational ultrasound imaging.
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Affiliation(s)
- Richard J Colchester
- Department of Medical Physics and Biomedical Engineering, University College London, Malet Place Engineering Building, London, WC1E 6BT, UK.
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, Charles Bell House, 67-73 Riding House Street, London, W1W 7EJ, UK.
| | - Callum Little
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, Charles Bell House, 67-73 Riding House Street, London, W1W 7EJ, UK
- Department of Cardiology, Royal Free Hampstead NHS Trust, Pond Street, London, NW3 2QG, UK
- Institute of Cardiovascular Science, University College London, Gower Street, London, WC1E 6BT, UK
| | - George Dwyer
- Department of Medical Physics and Biomedical Engineering, University College London, Malet Place Engineering Building, London, WC1E 6BT, UK
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, Charles Bell House, 67-73 Riding House Street, London, W1W 7EJ, UK
- Centre for Medical Image Computing, University College London, Gower Street, London, WC1E 6BT, UK
| | - Sacha Noimark
- Department of Medical Physics and Biomedical Engineering, University College London, Malet Place Engineering Building, London, WC1E 6BT, UK
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, Charles Bell House, 67-73 Riding House Street, London, W1W 7EJ, UK
- Materials Chemistry Research Centre, Department of Chemistry, University College London, London, WC1H 0AJ, UK
| | - Erwin J Alles
- Department of Medical Physics and Biomedical Engineering, University College London, Malet Place Engineering Building, London, WC1E 6BT, UK
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, Charles Bell House, 67-73 Riding House Street, London, W1W 7EJ, UK
| | - Edward Z Zhang
- Department of Medical Physics and Biomedical Engineering, University College London, Malet Place Engineering Building, London, WC1E 6BT, UK
| | - Christopher D Loder
- Department of Cardiology, Royal Free Hampstead NHS Trust, Pond Street, London, NW3 2QG, UK
- Institute of Cardiovascular Science, University College London, Gower Street, London, WC1E 6BT, UK
| | - Ivan P Parkin
- Materials Chemistry Research Centre, Department of Chemistry, University College London, London, WC1H 0AJ, UK
| | - Ioannis Papakonstantinou
- Photonic Innovations Lab, Department of Electronic and Electrical Engineering, University College London, Roberts Building, London, WC1E 7JE, UK
| | - Paul C Beard
- Department of Medical Physics and Biomedical Engineering, University College London, Malet Place Engineering Building, London, WC1E 6BT, UK
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, Charles Bell House, 67-73 Riding House Street, London, W1W 7EJ, UK
| | - Malcolm C Finlay
- Department of Medical Physics and Biomedical Engineering, University College London, Malet Place Engineering Building, London, WC1E 6BT, UK
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, Charles Bell House, 67-73 Riding House Street, London, W1W 7EJ, UK
- William Harvey Cardiovascular Research Institute, Queen Mary University of London and Barts Health Centre, London, EC1A 7BE, UK
| | - Roby D Rakhit
- Department of Cardiology, Royal Free Hampstead NHS Trust, Pond Street, London, NW3 2QG, UK
- Institute of Cardiovascular Science, University College London, Gower Street, London, WC1E 6BT, UK
| | - Adrien E Desjardins
- Department of Medical Physics and Biomedical Engineering, University College London, Malet Place Engineering Building, London, WC1E 6BT, UK
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, Charles Bell House, 67-73 Riding House Street, London, W1W 7EJ, UK
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24
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Merčep E, Herraiz JL, Deán-Ben XL, Razansky D. Transmission-reflection optoacoustic ultrasound (TROPUS) computed tomography of small animals. LIGHT, SCIENCE & APPLICATIONS 2019; 8:18. [PMID: 30728957 PMCID: PMC6351605 DOI: 10.1038/s41377-019-0130-5] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Revised: 01/08/2019] [Accepted: 01/12/2019] [Indexed: 02/07/2023]
Abstract
Rapid progress in the development of multispectral optoacoustic tomography techniques has enabled unprecedented insights into biological dynamics and molecular processes in vivo and noninvasively at penetration and spatiotemporal scales not covered by modern optical microscopy methods. Ultrasound imaging provides highly complementary information on elastic and functional tissue properties and further aids in enhancing optoacoustic image quality. We devised the first hybrid transmission-reflection optoacoustic ultrasound (TROPUS) small animal imaging platform that combines optoacoustic tomography with both reflection- and transmission-mode ultrasound computed tomography. The system features full-view cross-sectional tomographic imaging geometry for concomitant noninvasive mapping of the absorbed optical energy, acoustic reflectivity, speed of sound, and acoustic attenuation in whole live mice with submillimeter resolution and unrivaled image quality. Graphics-processing unit (GPU)-based algorithms employing spatial compounding and bent-ray-tracing iterative reconstruction were further developed to attain real-time rendering of ultrasound tomography images in the full-ring acquisition geometry. In vivo mouse imaging experiments revealed fine details on the organ parenchyma, vascularization, tissue reflectivity, density, and stiffness. We further used the speed of sound maps retrieved by the transmission ultrasound tomography to improve optoacoustic reconstructions via two-compartment modeling. The newly developed synergistic multimodal combination offers unmatched capabilities for imaging multiple tissue properties and biomarkers with high resolution, penetration, and contrast.
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Affiliation(s)
- Elena Merčep
- Faculty of Medicine, Technical University of Munich, Munich, Germany
- iThera Medical GmbH, Munich, Germany
| | - Joaquín L. Herraiz
- Nuclear Physics Group and UPARCOS, Complutense University of Madrid, CEI Moncloa, Madrid, Spain
- Health Research Institute of Hospital Clínico San Carlos (IdISSC), Madrid, Spain
| | - Xosé Luís Deán-Ben
- Institute for Biological and Medical Imaging (IBMI), Helmholtz Center Munich, Neuherberg, Germany
- Faculty of Medicine and Institute of Pharmacology and Toxicology, University of Zurich, Zurich, Switzerland
- Institute for Biomedical Engineering and Department of Information Technology and Electrical Engineering, ETH Zurich, Zurich, Switzerland
| | - Daniel Razansky
- Faculty of Medicine, Technical University of Munich, Munich, Germany
- Institute for Biological and Medical Imaging (IBMI), Helmholtz Center Munich, Neuherberg, Germany
- Faculty of Medicine and Institute of Pharmacology and Toxicology, University of Zurich, Zurich, Switzerland
- Institute for Biomedical Engineering and Department of Information Technology and Electrical Engineering, ETH Zurich, Zurich, Switzerland
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25
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Liu W, Li B, Gao H, Wang D, Wang L, Yang Z, Cao H, He W, Wang H, Zhang J, Xing Y. The application of small organic π-conjugated discotic derivatives in photoacoustic imaging and photothermal conversion. NANOTECHNOLOGY 2019; 30:035705. [PMID: 30444728 DOI: 10.1088/1361-6528/aaea25] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Near-infrared absorbing dyes are catching people's attention as they are committed to find materials with greater photoacoustic (PA) and photothermal (PT) effect. In this study, a new series of organic π-conjugated discotic derivatives synthesized via [2 + 2] click chemistry were introduced. The PA intensity and PT conversion effect of the derivatives were monitored. It was found that the π-conjugated discotic derivatives had a proper absorption peak and PA intensity by introducing the click regents. Furthermore, the PA intensity remained relatively high, while B12 molecules were embedded in hydrophobic phospholipid bilayer of liposomes (B12⊂L). The application in biological therapy for tumors become possible as the toxicity of B12⊂L was low. What's more, when B12 molecules embedded in poly (N-isopropylacrylamide)-block-poly (2-nitrobenzyl methacrylate) (PNIPAM-b-PNBM) thermosensitive micelles were irradiated by laser, the molecules could take the place of direct temperature stimulus. This work affords us a way to solve the problem in which direct temperature stimulus is inapplicable.
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Affiliation(s)
- Wenyan Liu
- Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, 100083 Beijing, People's Republic of China
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26
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Tang Y, Liu W, Li Y, Zhou Q, Yao J. Concurrent photoacoustic and ultrasound microscopy with a coaxial dual-element ultrasonic transducer. Vis Comput Ind Biomed Art 2018; 1:3. [PMID: 32240396 PMCID: PMC7098394 DOI: 10.1186/s42492-018-0003-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2018] [Accepted: 06/25/2018] [Indexed: 11/20/2022] Open
Abstract
Simultaneous photoacoustic and ultrasound (PAUS) imaging has attracted increasing attention in biomedical research to probe the optical and mechanical properties of tissue. However, the resolution for majority of the existing PAUS systems is on the order of 1 mm as the majority are designed for clinical use with low-frequency US detection. Here we developed a concurrent PAUS microscopy that consists of optical-resolution photoacoustic microscopy (OR-PAM) and high-frequency US pulse-echo imaging. This dual-modality system utilizes a novel coaxial dual-element ultrasonic transducer (DE-UST) and provides anatomical and functional information with complementary contrast mechanisms, achieving a spatial resolution of 7 μm for PA imaging and 106 μm for US imaging. We performed phantom studies to validate the system’s performance. The vasculature of a mouse’s hind paw was imaged to demonstrate the potential of this hybrid system for biomedical applications.
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Affiliation(s)
- Yuqi Tang
- Department of Biomedical Engineering, Duke University, Durham, NC, 27708, USA
| | - Wei Liu
- Department of Biomedical Engineering, Duke University, Durham, NC, 27708, USA
| | - Yang Li
- Department of Ophthalmology, Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, 90089, USA
| | - Qifa Zhou
- Department of Ophthalmology, Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, 90089, USA
| | - Junjie Yao
- Department of Biomedical Engineering, Duke University, Durham, NC, 27708, USA.
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27
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Li Y, Guo Z, Li G, Chen SL. Miniature fiber-optic high-intensity focused ultrasound device using a candle soot nanoparticles-polydimethylsiloxane composites-coated photoacoustic lens. OPTICS EXPRESS 2018; 26:21700-21711. [PMID: 30130872 DOI: 10.1364/oe.26.021700] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Accepted: 07/20/2018] [Indexed: 05/18/2023]
Abstract
We present a miniature fiber-optic ultrasound transmitter for generating high-intensity focused ultrasound (HIFU) based on photoacoustic transduction. The HIFU device consists of a fiber and a photoacoustic lens. We develop a simple fabrication procedure for making the photoacoustic lens, which is coated with candle soot nanoparticles-polydimethylsiloxane composites. The fiber is used to deliver pulsed laser for photoacoustic excitation, which facilitates the use of the HIFU device by eliminating the need of free-space optical alignment. The HIFU device (6.5 mm in diameter) produces focused acoustic pressures up to >30 MPa in peak positive with a tight -6-dB focal volume of ~100 μm and ~500 μm in the lateral and axial directions, respectively. Acoustic cavitation induced by the HIFU device is demonstrated. The miniature HIFU device facilitates handheld operation. It holds promise for clinical applications in intraoperative high-precision HIFU therapy. It can even be used for intracavitary therapy with further miniaturization.
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28
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Matthews TP, Poudel J, Li L, Wang LV, Anastasio MA. Parameterized joint reconstruction of the initial pressure and sound speed distributions for photoacoustic computed tomography. SIAM JOURNAL ON IMAGING SCIENCES 2018; 11:1560-1588. [PMID: 30956749 DOI: 10.1117/12.2291014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Accurate estimation of the initial pressure distribution in photoacoustic computed tomography (PACT) depends on knowledge of the sound speed distribution. However, the sound speed distribution is typically unknown. Further, the initial pressure and sound speed distributions cannot both, in general, be stably recovered from PACT measurements alone. In this work, a joint reconstruction (JR) method for the initial pressure distribution and a low-dimensional parameterized model of the sound speed distribution is proposed. By employing a priori information about the structure of the sound speed distribution, both the initial pressure and sound speed can be accurately recovered. The JR problem is solved by use of a proximal optimization method that allows constraints and non-smooth regularization functions for the initial pressure distribution. The gradients of the cost function with respect to the initial pressure and sound speed distributions are calculated by use of an adjoint state method that has the same per-iteration computational cost as calculating the gradient with respect to the initial pressure distribution alone. This approach is evaluated through 2D computer-simulation studies for a small animal imaging model and by application to experimental in vivo measurements of a mouse.
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Affiliation(s)
- Thomas P Matthews
- Department of Biomedical Engineering, Washington University in St. Louis, 1 Brookings Dr., St. Louis, MO 63130
| | - Joemini Poudel
- Department of Biomedical Engineering, Washington University in St. Louis, 1 Brookings Dr., St. Louis, MO 63130
| | - Lei Li
- Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, California Institute of Technology, 1200 E. California Blvd., MC 138-78, Pasadena, CA 91125
| | - Lihong V Wang
- Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, California Institute of Technology, 1200 E. California Blvd., MC 138-78, Pasadena, CA 91125
| | - Mark A Anastasio
- Department of Biomedical Engineering, Washington University in St. Louis, 1 Brookings Dr., St. Louis, MO 63130
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Matthews TP, Poudel J, Li L, Wang LV, Anastasio MA. Parameterized joint reconstruction of the initial pressure and sound speed distributions for photoacoustic computed tomography. SIAM JOURNAL ON IMAGING SCIENCES 2018; 11:1560-1588. [PMID: 30956749 PMCID: PMC6447310 DOI: 10.1137/17m1153649] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Accurate estimation of the initial pressure distribution in photoacoustic computed tomography (PACT) depends on knowledge of the sound speed distribution. However, the sound speed distribution is typically unknown. Further, the initial pressure and sound speed distributions cannot both, in general, be stably recovered from PACT measurements alone. In this work, a joint reconstruction (JR) method for the initial pressure distribution and a low-dimensional parameterized model of the sound speed distribution is proposed. By employing a priori information about the structure of the sound speed distribution, both the initial pressure and sound speed can be accurately recovered. The JR problem is solved by use of a proximal optimization method that allows constraints and non-smooth regularization functions for the initial pressure distribution. The gradients of the cost function with respect to the initial pressure and sound speed distributions are calculated by use of an adjoint state method that has the same per-iteration computational cost as calculating the gradient with respect to the initial pressure distribution alone. This approach is evaluated through 2D computer-simulation studies for a small animal imaging model and by application to experimental in vivo measurements of a mouse.
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Affiliation(s)
- Thomas P Matthews
- Department of Biomedical Engineering, Washington University in St. Louis, 1 Brookings Dr., St. Louis, MO 63130
| | - Joemini Poudel
- Department of Biomedical Engineering, Washington University in St. Louis, 1 Brookings Dr., St. Louis, MO 63130
| | - Lei Li
- Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, California Institute of Technology, 1200 E. California Blvd., MC 138-78, Pasadena, CA 91125
| | - Lihong V Wang
- Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, California Institute of Technology, 1200 E. California Blvd., MC 138-78, Pasadena, CA 91125
| | - Mark A Anastasio
- Department of Biomedical Engineering, Washington University in St. Louis, 1 Brookings Dr., St. Louis, MO 63130
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Li M, Lan B, Liu W, Xia J, Yao J. Internal-illumination photoacoustic computed tomography. JOURNAL OF BIOMEDICAL OPTICS 2018; 23:1-4. [PMID: 29573255 DOI: 10.1117/1.jbo.23.3.030506] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 03/05/2018] [Indexed: 05/07/2023]
Abstract
We report a photoacoustic computed tomography (PACT) system using a customized optical fiber with a cylindrical diffuser to internally illuminate deep targets. The traditional external light illumination in PACT usually limits the penetration depth to a few centimeters from the tissue surface, mainly due to strong optical attenuation along the light propagation path from the outside in. By contrast, internal light illumination, with external ultrasound detection, can potentially detect much deeper targets. Different from previous internal illumination PACT implementations using forward-looking optical fibers, our internal-illumination PACT system uses a customized optical fiber with a 3-cm-long conoid needle diffuser attached to the fiber tip, which can homogeneously illuminate the surrounding space and substantially enlarge the field of view. We characterized the internal illumination distribution and PACT system performance. We performed tissue phantom and in vivo animal studies to further demonstrate the superior imaging depth using internal illumination over external illumination. We imaged a 7.5-cm-deep leaf target embedded in optically scattering medium and the beating heart of a mouse overlaid with 3.7-cm-thick chicken tissue. Our results have collectively demonstrated that the internal light illumination combined with external ultrasound detection might be a useful strategy to improve the penetration depth of PACT in imaging deep organs of large animals and humans.
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Affiliation(s)
- Mucong Li
- Duke University, Department of Biomedical Engineering, Durham, North Carolina, United States
| | - Bangxin Lan
- Duke University, Department of Biomedical Engineering, Durham, North Carolina, United States
| | - Wei Liu
- Duke University, Department of Biomedical Engineering, Durham, North Carolina, United States
| | - Jun Xia
- University at Buffalo North Campus, Department of Biomedical Engineering, Buffalo, New York, United States
| | - Junjie Yao
- Duke University, Department of Biomedical Engineering, Durham, North Carolina, United States
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Johnson JL, Merrilees M, Shragge J, van Wijk K. All-optical extravascular laser-ultrasound and photoacoustic imaging of calcified atherosclerotic plaque in excised carotid artery. PHOTOACOUSTICS 2018; 9:62-72. [PMID: 29707480 PMCID: PMC5914201 DOI: 10.1016/j.pacs.2018.01.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 12/05/2017] [Accepted: 01/16/2018] [Indexed: 05/16/2023]
Abstract
Photoacoustic (PA) imaging may be advantageous as a safe, non-invasive imaging modality to image the carotid artery. However, calcification that accompanies atherosclerotic plaque is difficult to detect with PA due to the non-distinct optical absorption spectrum of hydroxyapatite. We propose reflection-mode all-optical laser-ultrasound (LUS) imaging to obtain high-resolution, non-contact, non-ionizing images of the carotid artery wall and calcification. All-optical LUS allows for flexible acquisition geometry and user-dependent data acquisition for high repeatability. We apply all-optical techniques to image an excised human carotid artery. Internal layers of the artery wall, enlargement of the vessel, and calcification are observed with higher resolution and reduced artifacts with nonconfocal LUS compared to confocal LUS. Validation with histology and X-ray computed tomography (CT) demonstrates the potential for LUS as a method for non-invasive imaging in the carotid artery.
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Affiliation(s)
- Jami L. Johnson
- University of Auckland, Faculty of Science, Department of Physics, Dodd-Walls Centre for Photonic and Quantum Technologies, Private Bag 92019, Auckland 1010, New Zealand
- Corresponding author.
| | - Mervyn Merrilees
- University of Auckland, Faculty of Medical and Health Sciences, Department of Anatomy and Medical Imaging, Private Bag 92019, Auckland 1142, New Zealand
| | - Jeffrey Shragge
- Colorado School of Mines, Center for Wave Phenomena, Geophysics Department, Golden, CO, USA
| | - Kasper van Wijk
- University of Auckland, Faculty of Science, Department of Physics, Dodd-Walls Centre for Photonic and Quantum Technologies, Private Bag 92019, Auckland 1010, New Zealand
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Matthews TP, Anastasio MA. Joint reconstruction of the initial pressure and speed of sound distributions from combined photoacoustic and ultrasound tomography measurements. INVERSE PROBLEMS 2017; 33:124002. [PMID: 29713110 PMCID: PMC5918297 DOI: 10.1088/1361-6420/aa9384] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The initial pressure and speed of sound (SOS) distributions cannot both be stably recovered from photoacoustic computed tomography (PACT) measurements alone. Adjunct ultrasound computed tomography (USCT) measurements can be employed to estimate the SOS distribution. Under the conventional image reconstruction approach for combined PACT/USCT systems, the SOS is estimated from the USCT measurements alone and the initial pressure is estimated from the PACT measurements by use of the previously estimated SOS. This approach ignores the acoustic information in the PACT measurements and may require many USCT measurements to accurately reconstruct the SOS. In this work, a joint reconstruction method where the SOS and initial pressure distributions are simultaneously estimated from combined PACT/USCT measurements is proposed. This approach allows accurate estimation of both the initial pressure distribution and the SOS distribution while requiring few USCT measurements.
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Affiliation(s)
- Thomas P Matthews
- Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA
| | - Mark A Anastasio
- Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA
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Oeri M, Bost W, Sénégond N, Tretbar S, Fournelle M. Hybrid Photoacoustic/Ultrasound Tomograph for Real-Time Finger Imaging. ULTRASOUND IN MEDICINE & BIOLOGY 2017; 43:2200-2212. [PMID: 28669429 DOI: 10.1016/j.ultrasmedbio.2017.05.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 04/26/2017] [Accepted: 05/08/2017] [Indexed: 05/07/2023]
Abstract
We report a target-enclosing, hybrid tomograph with a total of 768 elements based on capacitive micromachined ultrasound transducer technology and providing fast, high-resolution 2-D/3-D photoacoustic and ultrasound tomography tailored to finger imaging. A freely programmable ultrasound beamforming platform sampling data at 80 MHz was developed to realize plane wave transmission under multiple angles. A multiplexing unit enables the connection and control of a large number of elements. Fast image reconstruction is provided by GPU processing. The tomograph is composed of four independent and fully automated movable arc-shaped transducers, allowing imaging of all three finger joints. The system benefits from photoacoustics, yielding high optical contrast and enabling visualization of finger vascularization, and ultrasound provides morphologic information on joints and surrounding tissue. A diode-pumped, Q-switched Nd:YAG laser and an optical parametric oscillator are used to broaden the spectrum of emitted wavelengths to provide multispectral imaging. Custom-made optical fiber bundles enable illumination of the region of interest in the plane of acoustic detection. Precision in positioning of the probe in motion is ensured by use of a motor-driven guide slide. The current position of the probe is encoded by the stage and used to relate ultrasound and photoacoustic signals to the corresponding region of interest of the suspicious finger joint. The system is characterized in phantoms and a healthy human finger in vivo. The results obtained promise to provide new opportunities in finger diagnostics and establish photoacoustic/ultrasound-tomography in medical routine.
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Affiliation(s)
- Milan Oeri
- Ultrasound Division, Fraunhofer Institute for Biomedical Engineering (IBMT), St. Ingbert, Germany
| | - Wolfgang Bost
- Ultrasound Division, Fraunhofer Institute for Biomedical Engineering (IBMT), St. Ingbert, Germany
| | | | - Steffen Tretbar
- Ultrasound Division, Fraunhofer Institute for Biomedical Engineering (IBMT), St. Ingbert, Germany
| | - Marc Fournelle
- Ultrasound Division, Fraunhofer Institute for Biomedical Engineering (IBMT), St. Ingbert, Germany.
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Li L, Zhu L, Ma C, Lin L, Yao J, Wang L, Maslov K, Zhang R, Chen W, Shi J, Wang LV. Single-impulse Panoramic Photoacoustic Computed Tomography of Small-animal Whole-body Dynamics at High Spatiotemporal Resolution. Nat Biomed Eng 2017; 1:0071. [PMID: 29333331 PMCID: PMC5766044 DOI: 10.1038/s41551-017-0071] [Citation(s) in RCA: 249] [Impact Index Per Article: 35.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2016] [Accepted: 03/30/2017] [Indexed: 01/05/2023]
Abstract
Imaging of small animals has played an indispensable role in preclinical research by providing high dimensional physiological, pathological, and phenotypic insights with clinical relevance. Yet pure optical imaging suffers from either shallow penetration (up to ~1-2 mm) or a poor depth-to-resolution ratio (~1/3), and non-optical techniques for whole-body imaging of small animals lack either spatiotemporal resolution or functional contrast. Here, we demonstrate that standalone single-impulse photoacoustic computed tomography (SIP-PACT) mitigates these limitations by combining high spatiotemporal resolution (125-µm in-plane resolution, 50 µs / frame data acquisition and 50-Hz frame rate), deep penetration (48-mm cross-sectional width in vivo), anatomical, dynamical and functional contrasts, and full-view fidelity. By using SIP-PACT, we imaged in vivo whole-body dynamics of small animals in real time and obtained clear sub-organ anatomical and functional details. We tracked unlabeled circulating melanoma cells and imaged the vasculature and functional connectivity of whole rat brains. SIP-PACT holds great potential for both pre-clinical imaging and clinical translation.
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Affiliation(s)
- Lei Li
- Department of Electrical and Systems Engineering, Washington University in St. Louis, One Brookings Dr., St. Louis, MO, 63130
- Department of Medical Engineering, California Institute of Technology, 1200 E California Blvd., Pasadena, CA 91125
| | - Liren Zhu
- Department of Medical Engineering, California Institute of Technology, 1200 E California Blvd., Pasadena, CA 91125
- Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Dr., St. Louis, MO, 63130
| | - Cheng Ma
- Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Dr., St. Louis, MO, 63130
| | - Li Lin
- Department of Medical Engineering, California Institute of Technology, 1200 E California Blvd., Pasadena, CA 91125
- Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Dr., St. Louis, MO, 63130
| | - Junjie Yao
- Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Dr., St. Louis, MO, 63130
| | - Lidai Wang
- Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Dr., St. Louis, MO, 63130
| | - Konstantin Maslov
- Department of Medical Engineering, California Institute of Technology, 1200 E California Blvd., Pasadena, CA 91125
| | - Ruiying Zhang
- Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Dr., St. Louis, MO, 63130
| | - Wanyi Chen
- Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Dr., St. Louis, MO, 63130
| | - Junhui Shi
- Department of Medical Engineering, California Institute of Technology, 1200 E California Blvd., Pasadena, CA 91125
| | - Lihong V. Wang
- Department of Medical Engineering, California Institute of Technology, 1200 E California Blvd., Pasadena, CA 91125
- Department of Electrical Engineering, California Institute of Technology, 1200 E California Blvd., Pasadena, CA 91125
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35
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Matthews TP, Wang K, Li C, Duric N, Anastasio MA. Regularized Dual Averaging Image Reconstruction for Full-Wave Ultrasound Computed Tomography. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2017; 64:811-825. [PMID: 28320657 PMCID: PMC5516530 DOI: 10.1109/tuffc.2017.2682061] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Ultrasound computed tomography (USCT) holds great promise for breast cancer screening. Waveform inversion-based image reconstruction methods account for higher order diffraction effects and can produce high-resolution USCT images, but are computationally demanding. Recently, a source encoding technique has been combined with stochastic gradient descent (SGD) to greatly reduce image reconstruction times. However, this method bundles the stochastic data fidelity term with the deterministic regularization term. This limitation can be overcome by replacing SGD with a structured optimization method, such as the regularized dual averaging method, that exploits knowledge of the composition of the cost function. In this paper, the dual averaging method is combined with source encoding techniques to improve the effectiveness of regularization while maintaining the reduced reconstruction times afforded by source encoding. It is demonstrated that each iteration can be decomposed into a gradient descent step based on the data fidelity term and a proximal update step corresponding to the regularization term. Furthermore, the regularization term is never explicitly differentiated, allowing nonsmooth regularization penalties to be naturally incorporated. The wave equation is solved by the use of a time-domain method. The effectiveness of this approach is demonstrated through computer simulation and experimental studies. The results suggest that the dual averaging method can produce images with less noise and comparable resolution to those obtained by the use of SGD.
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36
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Da Silva A, Handschin C, Metwally K, Garci H, Riedinger C, Mensah S, Akhouayri H. Taking advantage of acoustic inhomogeneities in photoacoustic measurements. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:41012. [PMID: 28116445 DOI: 10.1117/1.jbo.22.4.041012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 12/27/2016] [Indexed: 06/06/2023]
Abstract
This paper proposes a method for improving the localization and the quantification of the optical parameters in photoacoustic (PA) tomography of biological tissues that are intrinsically heterogeneous in both optical and acoustic properties. It is based on the exploitation of both the PA signal, generated by the heterogeneous optical structures, and the secondary acoustic echoes due to the interaction between a primary PA wave generated near the tissue surface and the heterogeneous acoustic structures. These secondary echoes can also be collected through proper measurements of the PA signals. The experimental procedure is presented along with the method to filter the signal and the reconstruction algorithm that includes the account of the acoustic information.
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Affiliation(s)
- Anabela Da Silva
- Aix-Marseille Université, CNRS, Centrale Marseille, Institut Fresnel UMR 7249, 13013 Marseille, France
| | - Charles Handschin
- Aix-Marseille Université, CNRS, Centrale Marseille, Institut Fresnel UMR 7249, 13013 Marseille, FrancebSATT Sud Est (SATT PACA Corse SAS), 8 rue Sainte Barbe, CS 10422, 13205 Marseille Cedex 01, France
| | - Khaled Metwally
- Aix-Marseille Université, CNRS, Centrale Marseille, Institut Fresnel UMR 7249, 13013 Marseille, FrancebSATT Sud Est (SATT PACA Corse SAS), 8 rue Sainte Barbe, CS 10422, 13205 Marseille Cedex 01, France
| | - Houssem Garci
- Aix-Marseille Université, CNRS, Centrale Marseille, Institut Fresnel UMR 7249, 13013 Marseille, FrancebSATT Sud Est (SATT PACA Corse SAS), 8 rue Sainte Barbe, CS 10422, 13205 Marseille Cedex 01, France
| | - Christophe Riedinger
- Aix-Marseille Université, CNRS, Centrale Marseille, Institut Fresnel UMR 7249, 13013 Marseille, FrancebSATT Sud Est (SATT PACA Corse SAS), 8 rue Sainte Barbe, CS 10422, 13205 Marseille Cedex 01, France
| | - Serge Mensah
- Aix-Marseille Université, CNRS, Ecole Centrale Marseille, LMA UPR 7051, 13402 Marseille Cedex 20, France
| | - Hassan Akhouayri
- Aix-Marseille Université, CNRS, Centrale Marseille, Institut Fresnel UMR 7249, 13013 Marseille, France
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37
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Lou Y, Zhou W, Matthews TP, Appleton CM, Anastasio MA. Generation of anatomically realistic numerical phantoms for photoacoustic and ultrasonic breast imaging. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:41015. [PMID: 28138689 PMCID: PMC5282404 DOI: 10.1117/1.jbo.22.4.041015] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Accepted: 12/28/2016] [Indexed: 05/18/2023]
Abstract
Photoacoustic computed tomography (PACT) and ultrasound computed tomography (USCT) are emerging modalities for breast imaging. As in all emerging imaging technologies, computer-simulation studies play a critically important role in developing and optimizing the designs of hardware and image reconstruction methods for PACT and USCT. Using computer-simulations, the parameters of an imaging system can be systematically and comprehensively explored in a way that is generally not possible through experimentation. When conducting such studies, numerical phantoms are employed to represent the physical properties of the patient or object to-be-imaged that influence the measured image data. It is highly desirable to utilize numerical phantoms that are realistic, especially when task-based measures of image quality are to be utilized to guide system design. However, most reported computer-simulation studies of PACT and USCT breast imaging employ simple numerical phantoms that oversimplify the complex anatomical structures in the human female breast. We develop and implement a methodology for generating anatomically realistic numerical breast phantoms from clinical contrast-enhanced magnetic resonance imaging data. The phantoms will depict vascular structures and the volumetric distribution of different tissue types in the breast. By assigning optical and acoustic parameters to different tissue structures, both optical and acoustic breast phantoms will be established for use in PACT and USCT studies.
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Affiliation(s)
- Yang Lou
- Washington University in St. Louis, Department of Biomedical Engineering, 1 Brookings Drive, St. Louis, Missouri 63130, United States
| | - Weimin Zhou
- Washington University in St. Louis, Department of Electrical and Systems Engineering, 1 Brookings Drive, St. Louis, Missouri 63130, United States
| | - Thomas P. Matthews
- Washington University in St. Louis, Department of Biomedical Engineering, 1 Brookings Drive, St. Louis, Missouri 63130, United States
| | - Catherine M. Appleton
- Washington University in St. Louis, Mallinckrodt Institute of Radiology, 1 Brookings Drive, St. Louis, Missouri 63130, United States
| | - Mark A. Anastasio
- Washington University in St. Louis, Department of Biomedical Engineering, 1 Brookings Drive, St. Louis, Missouri 63130, United States
- Washington University in St. Louis, Department of Electrical and Systems Engineering, 1 Brookings Drive, St. Louis, Missouri 63130, United States
- Washington University in St. Louis, Mallinckrodt Institute of Radiology, 1 Brookings Drive, St. Louis, Missouri 63130, United States
- Address all correspondence to: Mark A. Anastasio, E-mail:
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38
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Johnson JL, Shragge J, van Wijk K. Nonconfocal all-optical laser-ultrasound and photoacoustic imaging system for angle-dependent deep tissue imaging. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:41014. [PMID: 28125155 DOI: 10.1117/1.jbo.22.4.041014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 01/03/2017] [Indexed: 05/28/2023]
Abstract
Biomedical imaging systems incorporating both photoacoustic (PA) and ultrasound capabilities are of interest for obtaining optical and acoustic properties deep in tissue. While most dual-modality systems utilize piezoelectric transducers, all-optical systems can obtain broadband high-resolution data with hands-free operation. Previously described reflection-mode all-optical laser-ultrasound (LUS) systems use a confocal source and detector; however, angle-dependent raypaths are lost in this configuration. As a result, the overall imaging aperture is reduced, which becomes increasingly problematic with depth. We present a reflection-mode nonconfocal LUS and PA imaging system that uses signals recorded on all-optical hardware to create angle-dependent images. We use reverse-time migration and time reversal to reconstruct the LUS and PA images. We demonstrate this methodology with both a numerical model and tissue phantom experiment to image a steep-curvature vessel with a limited aperture 2-cm beneath the surface. Nonconfocal imaging demonstrates improved focusing by 30% and 15% compared to images acquired with a single LUS source in the numerical and experimental LUS images, respectively. The appearance of artifacts is also reduced. Complementary PA images are straightforward to acquire with the nonconfocal system by tuning the source wavelength and can be further developed for quantitative multiview PA imaging.
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Affiliation(s)
- Jami L Johnson
- University of Auckland, Faculty of Science, The Dodd-Walls Centre for Photonic and Quantum Technologies and Department of Physics, Private Bag 92019, Auckland 1010, New Zealand
| | - Jeffrey Shragge
- The University of Western Australia, Faculty of Science, School of Physics and School of Earth Sciences, M004 35 Stirling Highway, Crawley, Western Australia 6009, Australia
| | - Kasper van Wijk
- University of Auckland, Faculty of Science, The Dodd-Walls Centre for Photonic and Quantum Technologies and Department of Physics, Private Bag 92019, Auckland 1010, New Zealand
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39
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Olefir I, Mercep E, Burton NC, Ovsepian SV, Ntziachristos V. Hybrid multispectral optoacoustic and ultrasound tomography for morphological and physiological brain imaging. JOURNAL OF BIOMEDICAL OPTICS 2016; 21:86005. [PMID: 27533442 DOI: 10.1117/1.jbo.21.8.086005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Accepted: 07/25/2016] [Indexed: 05/18/2023]
Abstract
Expanding usage of small animal models in biomedical research necessitates development of technologies for structural, functional, or molecular imaging that can be readily integrated in the biological laboratory. Herein, we consider dual multispectral optoacoustic (OA) and ultrasound tomography based on curved ultrasound detector arrays and describe the performance achieved for hybrid morphological and physiological brain imaging of mice in vivo. We showcase coregistered hemodynamic parameters resolved by OA tomography under baseline conditions and during alterations of blood oxygen saturation. As an internal reference, we provide imaging of abdominal organs. We illustrate the performance advantages of hybrid curved detector ultrasound and OA tomography and discuss immediate and long-term implications of our findings in the context of animal and human studies.
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Affiliation(s)
- Ivan Olefir
- Helmholtz Zentrum München, Institute for Biological and Medical Imaging, Ingolstädter Landstraße 1, Neuherberg 85764, GermanybTechnische Universität München, School of Bioengineering, Boltzmannstraße 11, Garching 85748, Germany
| | - Elena Mercep
- Helmholtz Zentrum München, Institute for Biological and Medical Imaging, Ingolstädter Landstraße 1, Neuherberg 85764, GermanycTechnische Universität München, Faculty of Medicine, Ismaninger Straße 22, Munich 81675, GermanydiThera Medical GmbH, Zielstattst
| | - Neal C Burton
- iThera Medical GmbH, Zielstattstrasse 13, Munich 81379, Germany
| | - Saak V Ovsepian
- Helmholtz Zentrum München, Institute for Biological and Medical Imaging, Ingolstädter Landstraße 1, Neuherberg 85764, GermanybTechnische Universität München, School of Bioengineering, Boltzmannstraße 11, Garching 85748, Germany
| | - Vasilis Ntziachristos
- Helmholtz Zentrum München, Institute for Biological and Medical Imaging, Ingolstädter Landstraße 1, Neuherberg 85764, GermanybTechnische Universität München, School of Bioengineering, Boltzmannstraße 11, Garching 85748, Germany
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40
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Li L, Xia J, Li G, Garcia-Uribe A, Sheng Q, Anastasio MA, Wang LV. Label-free photoacoustic tomography of whole mouse brain structures ex vivo. NEUROPHOTONICS 2016; 3:035001. [PMID: 29181425 PMCID: PMC5696384 DOI: 10.1117/1.nph.3.3.035001] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 07/06/2016] [Indexed: 05/03/2023]
Abstract
Capitalizing on endogenous hemoglobin contrast, photoacoustic-computed tomography (PACT), a deep-tissue high-resolution imaging modality, has drawn increasing interest in neuroimaging. However, most existing studies are limited to functional imaging on the cortical surface and the deep brain structural imaging capability of PACT has never been demonstrated. Here, we explicitly studied the limiting factors of deep brain PACT imaging. We found that the skull distorted the acoustic signal and blood suppressed the structural contrast from other chromophores. When the two effects are mitigated, PACT can potentially provide high-resolution label-free imaging of structures in the entire mouse brain. With [Formula: see text] in-plane resolution, we can clearly identify major structures of the brain, which complements magnetic resonance microscopy for imaging small-animal brain structures. Spectral PACT studies indicate that structural contrasts mainly originate from cytochrome distribution and that the presence of lipid sharpens the image contrast; brain histology results provide further validation. The feasibility of imaging the structure of the brain in vivo is also discussed. Our results demonstrate that PACT is a promising modality for both structural and functional brain imaging.
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Affiliation(s)
- Lei Li
- Washington University in St. Louis, Department of Electrical and System Engineering, One Brookings Drive, St. Louis, Missouri 63130, United States
- Washington University in St. Louis, Department of Biomedical Engineering, One Brookings Drive, St. Louis, Missouri 63130, United States
| | - Jun Xia
- University at Buffalo, The State University of New York, Department of Biomedical Engineering, 332 Bonner Hall, Buffalo, New York 14260, United States
| | - Guo Li
- Washington University in St. Louis, Department of Biomedical Engineering, One Brookings Drive, St. Louis, Missouri 63130, United States
| | - Alejandro Garcia-Uribe
- Washington University in St. Louis, Department of Biomedical Engineering, One Brookings Drive, St. Louis, Missouri 63130, United States
| | - Qiwei Sheng
- Washington University in St. Louis, Department of Biomedical Engineering, One Brookings Drive, St. Louis, Missouri 63130, United States
| | - Mark A. Anastasio
- Washington University in St. Louis, Department of Biomedical Engineering, One Brookings Drive, St. Louis, Missouri 63130, United States
| | - Lihong V. Wang
- Washington University in St. Louis, Department of Electrical and System Engineering, One Brookings Drive, St. Louis, Missouri 63130, United States
- Washington University in St. Louis, Department of Biomedical Engineering, One Brookings Drive, St. Louis, Missouri 63130, United States
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41
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Subochev P. Cost-effective imaging of optoacoustic pressure, ultrasonic scattering, and optical diffuse reflectance with improved resolution and speed. OPTICS LETTERS 2016; 41:1006-9. [PMID: 26974102 DOI: 10.1364/ol.41.001006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The idea of a method of cost-effective upgrades from an acoustic resolution photoacoustic microscope to a triple-modality imaging system is validated using phantoms. The newly developed experimental setup is based on a diode pumped solid state laser coupled to a fiber bundle with a spherically focused polyvinylidene fluoride detector integrated into the center of a ring shaped optical illuminator. Each laser pulse illuminating the sample performs two functions. While the photons absorbed by the sample provide a measurable optoacoustic (OA) signal, the photons absorbed by the detector provide the measurable diffuse reflectometry (DR) signal from the sample and the probing ultrasonic (US) pulse. At a 3 mm imaging depth, the axial resolution of the OA/US modalities is 38 μm/26 μm, while the lateral resolution of the DR/OA/US modalities is 3.5 mm/50 μm/35 μm. The maximum acquisition rate of the trimodal DR/OA/US A-scans is 2 kHz.
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42
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Biswas SK, van Es P, Steenbergen W, Manohar S. A Method for Delineation of Bone Surfaces in Photoacoustic Computed Tomography of the Finger. ULTRASONIC IMAGING 2016; 38:63-76. [PMID: 26048066 DOI: 10.1177/0161734615589288] [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] [Indexed: 05/07/2023]
Abstract
Photoacoustic (PA) imaging of interphalangeal peripheral joints is of interest in the context of using the synovial membrane as a surrogate marker of rheumatoid arthritis. Previous work has shown that ultrasound (US) produced by absorption of light at the epidermis reflects on the bone surfaces within the finger. When the reflected signals are backprojected in the region of interest, artifacts are produced, confounding interpretation of the images. In this work, we present an approach where the PA signals known to originate from the epidermis are treated as virtual US transmitters, and a separate reconstruction is performed as in US reflection imaging. This allows us to identify the bone surfaces. Furthermore, the identification of the joint space is important as this provides a landmark to localize a region-of-interest in seeking the inflamed synovial membrane. The ability to delineate bone surfaces allows us to identify not only the artifacts but also the interphalangeal joint space without recourse to new US hardware or a new measurement. We test the approach on phantoms and on a healthy human finger.
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Affiliation(s)
- S K Biswas
- Biomedical Photonic Imaging, University of Twente, Enschede, The Netherlands Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore, India
| | - P van Es
- Biomedical Photonic Imaging, University of Twente, Enschede, The Netherlands
| | - W Steenbergen
- Biomedical Photonic Imaging, University of Twente, Enschede, The Netherlands
| | - S Manohar
- Biomedical Photonic Imaging, University of Twente, Enschede, The Netherlands
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43
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Abstract
Photoacoustic tomography (PAT) combines rich optical absorption contrast with the high spatial resolution of ultrasound at depths in tissue. The high scalability of PAT has enabled anatomical imaging of biological structures ranging from organelles to organs. The inherent functional and molecular imaging capabilities of PAT have further allowed it to measure important physiological parameters and track critical cellular activities. Integration of PAT with other imaging technologies provides complementary capabilities and can potentially accelerate the clinical translation of PAT.
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Affiliation(s)
- Junjie Yao
- Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, MO, USA
| | - Jun Xia
- Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, MO, USA Department of Biomedical Engineering, University at Buffalo, The State University of New York, Buffalo, NY, USA
| | - Lihong V Wang
- Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, MO, USA
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44
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Ermilov SA, Su R, Conjusteau A, Anis F, Nadvoretskiy V, Anastasio MA, Oraevsky AA. Three-Dimensional Optoacoustic and Laser-Induced Ultrasound Tomography System for Preclinical Research in Mice: Design and Phantom Validation. ULTRASONIC IMAGING 2016; 38:77-95. [PMID: 26088582 DOI: 10.1177/0161734615591163] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
In this work, we introduce a novel three-dimensional imaging system for in vivo high-resolution anatomical and functional whole-body visualization of small animal models developed for preclinical and other type of biomedical research. The system (LOUIS-3DM) combines a multiwavelength optoacoustic tomography (OAT) and laser-induced ultrasound tomography (LUT) to obtain coregistered maps of tissue optical absorption and speed of sound, displayed within the skin outline of the studied animal. The most promising applications of the LOUIS-3DM include 3D angiography, cancer research, and longitudinal studies of biological distributions of optoacoustic contrast agents.
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Affiliation(s)
| | - R Su
- TomoWave Laboratories, Houston, TX, USA Department of Biomedical Engineering, University of Houston, Houston, TX, USA
| | | | - F Anis
- Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO, USA
| | | | - M A Anastasio
- Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO, USA
| | - A A Oraevsky
- TomoWave Laboratories, Houston, TX, USA Department of Biomedical Engineering, University of Houston, Houston, TX, USA
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45
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Sheng Q, Wang K, Matthews TP, Xia J, Zhu L, Wang LV, Anastasio MA. A Constrained Variable Projection Reconstruction Method for Photoacoustic Computed Tomography Without Accurate Knowledge of Transducer Responses. IEEE TRANSACTIONS ON MEDICAL IMAGING 2015; 34:2443-58. [PMID: 26641726 PMCID: PMC5886799 DOI: 10.1109/tmi.2015.2437356] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Photoacoustic computed tomography (PACT) is an emerging computed imaging modality that exploits optical contrast and ultrasonic detection principles to form images of the absorbed optical energy density within tissue. When the imaging system employs conventional piezoelectric ultrasonic transducers, the ideal photoacoustic (PA) signals are degraded by the transducers' acousto-electric impulse responses (EIRs) during the measurement process. If unaccounted for, this can degrade the accuracy of the reconstructed image. In principle, the effect of the EIRs on the measured PA signals can be ameliorated via deconvolution; images can be reconstructed subsequently by application of a reconstruction method that assumes an idealized EIR. Alternatively, the effect of the EIR can be incorporated into an imaging model and implicitly compensated for during reconstruction. In either case, the efficacy of the correction can be limited by errors in the assumed EIRs. In this work, a joint optimization approach to PACT image reconstruction is proposed for mitigating errors in reconstructed images that are caused by use of an inaccurate EIR. The method exploits the bi-linear nature of the imaging model and seeks to refine the measured EIR during the process of reconstructing the sought-after absorbed optical energy density. Computer-simulation and experimental studies are conducted to investigate the numerical properties of the method and demonstrate its value for mitigating image distortions and enhancing the visibility of fine structures.
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46
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Merčep E, Jeng G, Morscher S, Li PC, Razansky D. Hybrid optoacoustic tomography and pulse-echo ultrasonography using concave arrays. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2015; 62:1651-61. [PMID: 26415127 DOI: 10.1109/tuffc.2015.007058] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Implementation of hybrid imaging using optoacoustic tomography (OAT) and ultrasound (US) brings together the important advantages and complementary features of both methods. However, the fundamentally different physical contrast mechanisms of the two modalities may impose significant difficulties in the optimal tomographic data acquisition and image formation strategies. We investigate the applicability of the commonly applied imaging geometries for acquisition and reconstruction of hybrid optoacoustic tomography and pulse-echo ultrasound (OPUS) images. Optimization of the ultrasound image formation strategy using concave array geometry was implemented using a synthetic aperture method combined with spatial compounding. Experimental validation was performed using a custom-made multiplexer unit executing switching between the two modalities employing the same transducer array. A variety of array probes with different angular coverages were subsequently tested, including arrays for clinical hand-held imaging as well as stationary arrays for tomographic small animal imaging. The results demonstrate that acquisition of OAT data by mere addition of an illumination source to the common US linear array geometry may result in significant limited-view artifacts and overall loss of image quality. On the other hand, unsatisfactory US image quality is achieved with tomographic arrays solely optimized for OAT image acquisition without considering the optimal transmit-receive beamforming parameters. Optimal selection of the array pitch size, tomographic coverage and spatial compounding parameters has achieved here an accurate hybrid imaging performance, which was experimentally showcased in tissuemimicking phantoms, post-mortem mice, and hand-held imaging of a healthy volunteer. The efficient combination of the two modalities in a single imaging device reveals the true power of functional and molecular imaging capacities of OAT in addition to the morphological and functional imaging capabilities of US.
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47
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Wang J, Zhao Z, Song J, Chen G, Nie Z, Liu QH. Reducing the effects of acoustic heterogeneity with an iterative reconstruction method from experimental data in microwave induced thermoacoustic tomography. Med Phys 2015; 42:2103-12. [PMID: 25979005 DOI: 10.1118/1.4916660] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE An iterative reconstruction method has been previously reported by the authors of this paper. However, the iterative reconstruction method was demonstrated by solely using the numerical simulations. It is essential to apply the iterative reconstruction method to practice conditions. The objective of this work is to validate the capability of the iterative reconstruction method for reducing the effects of acoustic heterogeneity with the experimental data in microwave induced thermoacoustic tomography. METHODS Most existing reconstruction methods need to combine the ultrasonic measurement technology to quantitatively measure the velocity distribution of heterogeneity, which increases the system complexity. Different to existing reconstruction methods, the iterative reconstruction method combines time reversal mirror technique, fast marching method, and simultaneous algebraic reconstruction technique to iteratively estimate the velocity distribution of heterogeneous tissue by solely using the measured data. Then, the estimated velocity distribution is used subsequently to reconstruct the highly accurate image of microwave absorption distribution. Experiments that a target placed in an acoustic heterogeneous environment are performed to validate the iterative reconstruction method. RESULTS By using the estimated velocity distribution, the target in an acoustic heterogeneous environment can be reconstructed with better shape and higher image contrast than targets that are reconstructed with a homogeneous velocity distribution. CONCLUSIONS The distortions caused by the acoustic heterogeneity can be efficiently corrected by utilizing the velocity distribution estimated by the iterative reconstruction method. The advantage of the iterative reconstruction method over the existing correction methods is that it is successful in improving the quality of the image of microwave absorption distribution without increasing the system complexity.
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Affiliation(s)
- Jinguo Wang
- School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China
| | - Zhiqin Zhao
- School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China
| | - Jian Song
- School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China
| | - Guoping Chen
- School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China
| | - Zaiping Nie
- School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China
| | - Qing-Huo Liu
- Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708
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48
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Wang K, Matthews T, Anis F, Li C, Duric N, Anastasio MA. Waveform inversion with source encoding for breast sound speed reconstruction in ultrasound computed tomography. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2015; 62:475-93. [PMID: 25768816 PMCID: PMC5087608 DOI: 10.1109/tuffc.2014.006788] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Ultrasound computed tomography (USCT) holds great promise for improving the detection and management of breast cancer. Because they are based on the acoustic wave equation, waveform inversion-based reconstruction methods can produce images that possess improved spatial resolution properties over those produced by ray-based methods. However, waveform inversion methods are computationally demanding and have not been applied widely in USCT breast imaging. In this work, source encoding concepts are employed to develop an accelerated USCT reconstruction method that circumvents the large computational burden of conventional waveform inversion methods. This method, referred to as the waveform inversion with source encoding (WISE) method, encodes the measurement data using a random encoding vector and determines an estimate of the sound speed distribution by solving a stochastic optimization problem by use of a stochastic gradient descent algorithm. Both computer simulation and experimental phantom studies are conducted to demonstrate the use of the WISE method. The results suggest that the WISE method maintains the high spatial resolution of waveform inversion methods while significantly reducing the computational burden.
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Affiliation(s)
- Kun Wang
- Department of Biomedical Engineering, Washington University in St.
Louis, St. Louis, MO 63130
| | - Thomas Matthews
- Department of Biomedical Engineering, Washington University in St.
Louis, St. Louis, MO 63130
| | - Fatima Anis
- Department of Biomedical Engineering, Washington University in St.
Louis, St. Louis, MO 63130
| | - Cuiping Li
- Delphinus Medical Technologies, Plymouth, MI 48170
| | - Neb Duric
- Delphinus Medical Technologies, Plymouth, MI 48170; Karmanos Cancer
Institute, Wayne State University, 4100 John R. Street, 5 HWCRC, Detroit, MI
48201
| | - Mark A. Anastasio
- Department of Biomedical Engineering, Washington University in St.
Louis, St. Louis, MO 63130
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49
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Deán-Ben XL, Ntziachristos V, Razansky D. Effects of small variations of speed of sound in optoacoustic tomographic imaging. Med Phys 2015; 41:073301. [PMID: 24989414 DOI: 10.1118/1.4875691] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE Speed of sound difference in the imaged object and surrounding coupling medium may reduce the resolution and overall quality of optoacoustic tomographic reconstructions obtained by assuming a uniform acoustic medium. In this work, the authors investigate the effects of acoustic heterogeneities and discuss potential benefits of accounting for those during the reconstruction procedure. METHODS The time shift of optoacoustic signals in an acoustically heterogeneous medium is studied theoretically by comparing different continuous and discrete wave propagation models. A modification of filtered back-projection reconstruction is subsequently implemented by considering a straight acoustic rays model for ultrasound propagation. The results obtained with this reconstruction procedure are compared numerically and experimentally to those obtained assuming a heuristically fitted uniform speed of sound in both full-view and limited-view optoacoustic tomography scenarios. RESULTS The theoretical analysis showcases that the errors in the time-of-flight of the signals predicted by considering the straight acoustic rays model tend to be generally small. When using this model for reconstructing simulated data, the resulting images accurately represent the theoretical ones. On the other hand, significant deviations in the location of the absorbing structures are found when using a uniform speed of sound assumption. The experimental results obtained with tissue-mimicking phantoms and a mouse postmortem are found to be consistent with the numerical simulations. CONCLUSIONS Accurate analysis of effects of small speed of sound variations demonstrates that accounting for differences in the speed of sound allows improving optoacoustic reconstruction results in realistic imaging scenarios involving acoustic heterogeneities in tissues and surrounding media.
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Affiliation(s)
- X Luís Deán-Ben
- Institute for Biological and Medical Imaging, Technical University of Munich and Helmholtz Center Munich, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
| | - Vasilis Ntziachristos
- Institute for Biological and Medical Imaging, Technical University of Munich and Helmholtz Center Munich, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
| | - Daniel Razansky
- Institute for Biological and Medical Imaging, Technical University of Munich and Helmholtz Center Munich, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
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50
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Li G, Xia J, Wang K, Maslov K, Anastasio MA, Wang LV. Tripling the detection view of high-frequency linear-array-based photoacoustic computed tomography by using two planar acoustic reflectors. Quant Imaging Med Surg 2015; 5:57-62. [PMID: 25694954 DOI: 10.3978/j.issn.2223-4292.2014.11.09] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 10/19/2014] [Indexed: 11/14/2022]
Abstract
BACKGROUND Linear-array-based photoacoustic computed tomography (PACT) suffers from a limited view. Circular scanning does increase the detection view angle but is time-consuming. Therefore, it is desirable to increase the detection view angle of linear-array-based PACT without sacrificing imaging speed. METHODS Two planar acoustic reflectors placed at 120 degrees to each other were added to a linear-array-based PACT system. Each reflector redirects originally undetectable photoacoustic waves back to the transducer array elements, and together they triple the original detection view angle of the PACT system. RESULTS Adding two reflectors increased the detection view angle from 80 to 240 degrees. As a comparison, a single-reflector PACT has a detection view angle of only 160 degrees. A leaf skeleton phantom with a rich vascular network was imaged with the double-reflector PACT, and most of its features were recovered. CONCLUSIONS The two acoustic reflectors triple the detection view angle of a linear-array-based PACT without compromising the original imaging speed. This nearly full-view detection capability produces higher-quality images than single-reflector PACT or conventional PACT without reflectors.
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Affiliation(s)
- Guo Li
- Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Drive, St. Louis, MO 63130, USA
| | - Jun Xia
- Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Drive, St. Louis, MO 63130, USA
| | - Kun Wang
- Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Drive, St. Louis, MO 63130, USA
| | - Konstantin Maslov
- Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Drive, St. Louis, MO 63130, USA
| | - Mark A Anastasio
- Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Drive, St. Louis, MO 63130, USA
| | - Lihong V Wang
- Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Drive, St. Louis, MO 63130, USA
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