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Hirasawa T, Tachi K, Ishikawa T, Miyashita M, Ito K, Ishihara M. Photoacoustic microscopy for real-time monitoring of near-infrared optical absorbers inside biological tissue. JOURNAL OF BIOMEDICAL OPTICS 2024; 29:S11527. [PMID: 38464883 PMCID: PMC10924425 DOI: 10.1117/1.jbo.29.s1.s11527] [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: 09/29/2023] [Revised: 02/09/2024] [Accepted: 02/13/2024] [Indexed: 03/12/2024]
Abstract
Significance We developed a high-speed optical-resolution photoacoustic microscopy (OR-PAM) system using a high-repetition-rate supercontinuum (SC) light source and a two-axes Galvano scanner. The OR-PAM system enabled real-time imaging of optical absorbers inside biological tissues with excellent excitation wavelength tunability. Aim In the near-infrared (NIR) wavelength range, high-speed OR-PAM faces limitations due to the lack of wavelength-tunable light sources. Our study aimed to enable high-speed OR-PAM imaging of various optical absorbers, including NIR contrast agents, and validate the performance of high-speed OR-PAM in the detection of circulating tumor cells (CTCs). Approach A high-repetition nanosecond pulsed SC light source was used for OR-PAM. The excitation wavelength was adjusted by bandpass filtering of broadband light pulses produced by an SC light source. Phantom and in vivo experiments were performed to detect tumor cells stained with an NIR contrast agent within flowing blood samples. Results The newly developed high-speed OR-PAM successfully detected stained cells both in the phantom and in vivo. The phantom experiment confirmed the correlation between the tumor cell detection rate and tumor cell concentration in the blood sample. Conclusions The high-speed OR-PAM effectively detected stained tumor cells. Combining high-speed OR-PAM with molecular probes that stain tumor cells in vivo enables in vivo CTC detection.
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Affiliation(s)
- Takeshi Hirasawa
- National Defense Medical College, Department of Medical Engineering, Tokorozawa, Japan
| | - Kazuyoshi Tachi
- National Defense Medical College, Department of Medical Engineering, Tokorozawa, Japan
- National Defense Medical College, Department of Urology, Tokorozawa, Japan
| | - Tomohiro Ishikawa
- National Defense Medical College, Department of Medical Engineering, Tokorozawa, Japan
| | - Manami Miyashita
- National Defense Medical College, Department of Medical Engineering, Tokorozawa, Japan
| | - Keiichi Ito
- National Defense Medical College, Department of Urology, Tokorozawa, Japan
| | - Miya Ishihara
- National Defense Medical College, Department of Medical Engineering, Tokorozawa, Japan
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Song W, Guo C, Zhao Y, Wang YC, Zhu S, Min C, Yuan X. Ultraviolet metasurface-assisted photoacoustic microscopy with great enhancement in DOF for fast histology imaging. PHOTOACOUSTICS 2023; 32:100525. [PMID: 37645256 PMCID: PMC10461204 DOI: 10.1016/j.pacs.2023.100525] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 06/14/2023] [Accepted: 06/22/2023] [Indexed: 08/31/2023]
Abstract
Pathology interpretations of tissue rely on the gold standard of histology imaging, potentially hampering timely access to critical information for diagnosis and management of neoplasms because of tedious sample preparations. Slide-free capture of cell nuclei in unprocessed specimens without staining is preferable; however, inevitable irregular surfaces in fresh tissues results in limitations. An ultraviolet metasurface with the ability to generate an ultraviolet optical focus maintaining < 1.1-µm in lateral resolution and ∼290 µm in depth of field (DOF) is proposed for fast, high resolution, label-free photoacoustic histological imaging of unprocessed tissues with uneven surfaces. Microanatomical characteristics of the cell nuclei can be observed, as demonstrated by the mouse brain samples that were cut by hand and a ∼3 × 3-mm2 field of view was imaged in ∼27 min. Therefore, ultraviolet metasurface-assisted photoacoustic microscopy is anticipated to benefit intraoperative pathological assessments and basic scientific research by alleviating laborious tissue preparations.
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Affiliation(s)
- Wei Song
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics & State Key Laboratory of Radio Frequency Heterogeneous, Shenzhen University, Shenzhen 518060, China
| | - Changkui Guo
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics & State Key Laboratory of Radio Frequency Heterogeneous, Shenzhen University, Shenzhen 518060, China
| | - Yuting Zhao
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics & State Key Laboratory of Radio Frequency Heterogeneous, Shenzhen University, Shenzhen 518060, China
| | - Ya-chao Wang
- Depart of Neurosurgery, The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen 518060, China
| | - Siwei Zhu
- The Institute of Translational Medicine, Tianjin Union Medical Center of Nankai University, Tianjin 300121, China
| | - Changjun Min
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics & State Key Laboratory of Radio Frequency Heterogeneous, Shenzhen University, Shenzhen 518060, China
| | - Xiaocong Yuan
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics & State Key Laboratory of Radio Frequency Heterogeneous, Shenzhen University, Shenzhen 518060, China
- Research Center for Humanoid Sensing, Zhejiang Laboratory, Hangzhou 311100, China
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Zhang Y, Chen J, Zhang J, Zhu J, Liu C, Sun H, Wang L. Super-Low-Dose Functional and Molecular Photoacoustic Microscopy. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2302486. [PMID: 37310419 PMCID: PMC10427362 DOI: 10.1002/advs.202302486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 05/21/2023] [Indexed: 06/14/2023]
Abstract
Photoacoustic microscopy can image many biological molecules and nano-agents in vivo via low-scattering ultrasonic sensing. Insufficient sensitivity is a long-standing obstacle for imaging low-absorbing chromophores with less photobleaching or toxicity, reduced perturbation to delicate organs, and more choices of low-power lasers. Here, the photoacoustic probe design is collaboratively optimized and a spectral-spatial filter is implemented. A multi-spectral super-low-dose photoacoustic microscopy (SLD-PAM) is presented that improves the sensitivity by ≈33 times. SLD-PAM can visualize microvessels and quantify oxygen saturation in vivo with ≈1% of the maximum permissible exposure, dramatically reducing potential phototoxicity or perturbation to normal tissue function, especially in imaging of delicate tissues, such as the eye and the brain. Capitalizing on the high sensitivity, direct imaging of deoxyhemoglobin concentration is achieved without spectral unmixing, avoiding wavelength-dependent errors and computational noises. With reduced laser power, SLD-PAM can reduce photobleaching by ≈85%. It is also demonstrated that SLD-PAM achieves similar molecular imaging quality using 80% fewer contrast agents. Therefore, SLD-PAM enables the use of a broader range of low-absorbing nano-agents, small molecules, and genetically encoded biomarkers, as well as more types of low-power light sources in wide spectra. It is believed that SLD-PAM offers a powerful tool for anatomical, functional, and molecular imaging.
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Affiliation(s)
- Yachao Zhang
- Department of Biomedical EngineeringCity University of Hong KongHong KongSAR999077China
| | - Jiangbo Chen
- Department of Biomedical EngineeringCity University of Hong KongHong KongSAR999077China
| | - Jie Zhang
- Department of Chemistry and COSADAF (Centre of Super‐Diamond and Advanced Films)City University of Hong KongHong KongSAR999077China
| | - Jingyi Zhu
- Department of Biomedical EngineeringCity University of Hong KongHong KongSAR999077China
| | - Chao Liu
- Department of Biomedical EngineeringCity University of Hong KongHong KongSAR999077China
| | - Hongyan Sun
- Department of Chemistry and COSADAF (Centre of Super‐Diamond and Advanced Films)City University of Hong KongHong KongSAR999077China
| | - Lidai Wang
- Department of Biomedical EngineeringCity University of Hong KongHong KongSAR999077China
- City University of Hong Kong Shenzhen Research InstituteShenzhenChina518057
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Zafar M, Manwar R, McGuire LS, Charbel FT, Avanaki K. Ultra-widefield and high-speed spiral laser scanning OR-PAM: System development and characterization. JOURNAL OF BIOPHOTONICS 2023:e202200383. [PMID: 36998211 DOI: 10.1002/jbio.202200383] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 03/01/2023] [Accepted: 03/15/2023] [Indexed: 06/19/2023]
Abstract
Photoacoustic microscopy (PAM) is a high-resolution imaging modality that has been mainly implemented with small field of view applications. Here, we developed a fast PAM system that utilizes a unique spiral laser scanning mechanism and a wide acoustic detection unit. The developed system can image an area of 12.5 cm2 in 6.4 s. The system has been characterized using highly detailed phantoms. Finally, the imaging capabilities of the system were further demonstrated by imaging a sheep brain ex vivo and a rat brain in vivo.
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Affiliation(s)
- Mohsin Zafar
- The Richard and Loan Hill, Department of Biomedical Engineering, University of Illinois at Chicago, Chicago, Illinois, USA
- Department of Biomedical Engineering, Wayne State University, Detroit, Michigan, USA
| | - Rayyan Manwar
- The Richard and Loan Hill, Department of Biomedical Engineering, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Laura S McGuire
- Department of Neurological Surgery, University of Illinois at Chicago - College of Medicine, Chicago, Illinois, USA
| | - Fady T Charbel
- Department of Neurological Surgery, University of Illinois at Chicago - College of Medicine, Chicago, Illinois, USA
| | - Kamran Avanaki
- The Richard and Loan Hill, Department of Biomedical Engineering, University of Illinois at Chicago, Chicago, Illinois, USA
- Department of Dermatology, University of Illinois at Chicago, Chicago, Illinois, USA
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Chen J, Zhang Y, Zhu J, Tang X, Wang L. Freehand scanning photoacoustic microscopy with simultaneous localization and mapping. PHOTOACOUSTICS 2022; 28:100411. [PMID: 36254241 PMCID: PMC9568868 DOI: 10.1016/j.pacs.2022.100411] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 10/03/2022] [Accepted: 10/06/2022] [Indexed: 05/02/2023]
Abstract
Optical-resolution photoacoustic microscopy offers high-resolution, label-free hemodynamic and functional imaging to many biomedical applications. However, long-standing technical barriers, such as limited field of view, bulky scanning probes, and slow imaging speed, have limited the application of optical-resolution photoacoustic microscopy. Here, we present freehand scanning photoacoustic microscopy (FS-PAM) that can flexibly image various anatomical sites. We develop a compact handheld photoacoustic probe to acquire 3D images with high speed, and great flexibility. The high scanning speed not only enables video camera mode imaging but also allows for the first implementation of simultaneous localization and mapping (SLAM) in photoacoustic microscopy. We demonstrate fast in vivo imaging of some mouse organs, and human oral mucosa. The high imaging speed greatly reduces motion artifacts and distortions from tissue moving, breathing, and unintended handshaking. We demonstrate small-lesion localization in a large region of the brain. FS-PAM offers a flexible high-speed imaging tool with an extendable field of view, enabling more biomedical imaging applications.
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Affiliation(s)
- Jiangbo Chen
- Department of Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Ave, Kowloon, Hong Kong Special Administrative Region of China
| | - Yachao Zhang
- Department of Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Ave, Kowloon, Hong Kong Special Administrative Region of China
| | - Jingyi Zhu
- Department of Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Ave, Kowloon, Hong Kong Special Administrative Region of China
| | - Xu Tang
- Department of Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Ave, Kowloon, Hong Kong Special Administrative Region of China
| | - Lidai Wang
- Department of Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Ave, Kowloon, Hong Kong Special Administrative Region of China
- City University of Hong Kong Shenzhen Research Institute, Yuexing Yi Dao, Shenzhen, Guang Dong 518057, China
- Corresponding author at: Department of Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Ave, Kowloon, Hong Kong Special Administrative Region of China.
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Zhang R, Li LS, Rao B, Rong H, Sun MY, Yao J, Chen R, Zhou Q, Mennerick S, Raman B, Wang LV. Multiscale photoacoustic tomography of neural activities with GCaMP calcium indicators. JOURNAL OF BIOMEDICAL OPTICS 2022; 27:JBO-220087GR. [PMID: 36088528 PMCID: PMC9463545 DOI: 10.1117/1.jbo.27.9.096004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 08/24/2022] [Indexed: 06/15/2023]
Abstract
SIGNIFICANCE Optical imaging of responses in fluorescently labeled neurons has progressed significantly in recent years. However, there is still a need to monitor neural activities at divergent spatial scales and at depths beyond the optical diffusion limit. AIM To meet these needs, we aim to develop multiscale photoacoustic tomography (PAT) to image neural activities across spatial scales with a genetically encoded calcium indicator GCaMP. APPROACH First, using photoacoustic microscopy, we show that depth-resolved GCaMP signals can be monitored in vivo from a fly brain in response to odor stimulation without depth scanning and even with the cuticle intact. In vivo monitoring of GCaMP signals was also demonstrated in mouse brains. Next, using photoacoustic computed tomography, we imaged neural responses of a mouse brain slice at depths beyond the optical diffusion limit. RESULTS We provide the first unambiguous demonstration that multiscale PAT can be used to record neural activities in transgenic flies and mice with select neurons expressing GCaMP. CONCLUSIONS Our results indicate that the combination of multiscale PAT and fluorescent neural activity indicators provides a methodology for imaging targeted neurons at various scales.
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Affiliation(s)
- Ruiying Zhang
- Washington University in Saint Louis, Department of Biomedical Engineering, Saint Louis, Missouri, United States
| | - Lei S. Li
- California Institute of Technology, Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, Pasadena, California, United States
| | - Bin Rao
- Washington University in Saint Louis, Department of Biomedical Engineering, Saint Louis, Missouri, United States
| | - Haoyang Rong
- Washington University in Saint Louis, Department of Biomedical Engineering, Saint Louis, Missouri, United States
| | - Min-Yu Sun
- Washington University School of Medicine, Department of Psychiatry, Saint Louis, Missouri, United States
| | - Junjie Yao
- Washington University in Saint Louis, Department of Biomedical Engineering, Saint Louis, Missouri, United States
| | - Ruimin Chen
- University of Southern California, Department of Biomedical Engineering, Los Angeles, California, United States
| | - Qifa Zhou
- University of Southern California, Department of Biomedical Engineering, Los Angeles, California, United States
| | - Steven Mennerick
- Washington University School of Medicine, Department of Psychiatry, Saint Louis, Missouri, United States
| | - Baranidharan Raman
- Washington University in Saint Louis, Department of Biomedical Engineering, Saint Louis, Missouri, United States
| | - Lihong V. Wang
- California Institute of Technology, Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, Pasadena, California, United States
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7
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Song W, Wang YC, Chen H, Li X, Zhou L, Min C, Zhu S, Yuan X. Label-free identification of human glioma xenograft of mouse brain with quantitative ultraviolet photoacoustic histology imaging. JOURNAL OF BIOPHOTONICS 2022; 15:e202100329. [PMID: 35000293 DOI: 10.1002/jbio.202100329] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Revised: 12/14/2021] [Accepted: 01/07/2022] [Indexed: 06/14/2023]
Abstract
The ability to unveil molecular specificities of endogenous nonfluorescent chromophores of ultraviolet photoacoustic imaging technology enables label-free histology imaging of tissue specimens. In this work, we exploit ultraviolet photoacoustic microscopy for identifying human glioma xenograft of mouse brain ex vivo. Intrinsically excellent imaging contrast of cell nucleus at ultraviolet photoacoustic illumination along with good spatial resolution allows for discerning the brain glioma of freshly-harvested thick brain slices, which circumvents laborious time-consuming preparations of the tissue specimens including micrometer-thick slicing and H&E staining that are prerequisites in standard histology analysis. The identification of tumor margins and quantitative analysis of tumor areas is implemented, representing good agreement with the standard H&E-stained observations. Quantitative ultraviolet photoacoustic microscopy can access fast pathological assessment to the brain tissues, and thus potentially facilitates intraoperative brain tumor resection to precisely remove all cancerous cells and preserve healthy tissue for maintaining its essential function.
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Affiliation(s)
- Wei Song
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, China
| | - Ya-Chao Wang
- Department of Neurosurgery, The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen, China
- The Institute Translational Medicine, The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen, China
| | - Huang Chen
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, China
| | - Xiangzhu Li
- Department of Neurosurgery, The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen, China
| | - Lingxiao Zhou
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, China
| | - Changjun Min
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, China
| | - Siwei Zhu
- The Institute of Translational Medicine, Tianjin Union Medical Center of Nankai University, Tianjin, China
| | - Xiaocong Yuan
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, China
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Photoacoustic Imaging in Biomedicine and Life Sciences. Life (Basel) 2022; 12:life12040588. [PMID: 35455079 PMCID: PMC9028050 DOI: 10.3390/life12040588] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 02/19/2022] [Indexed: 12/25/2022] Open
Abstract
Photo-acoustic imaging, also known as opto-acoustic imaging, has become a widely popular modality for biomedical applications. This hybrid technique possesses the advantages of high optical contrast and high ultrasonic resolution. Due to the distinct optical absorption properties of tissue compartments and main chromophores, photo-acoustics is able to non-invasively observe structural and functional variations within biological tissues including oxygenation and deoxygenation, blood vessels and spatial melanin distribution. The detection of acoustic waves produced by a pulsed laser source yields a high scaling range, from organ level photo-acoustic tomography to sub-cellular or even molecular imaging. This review discusses significant novel technical solutions utilising photo-acoustics and their applications in the fields of biomedicine and life sciences.
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Yang F, Guo G, Zheng S, Fang H, Min C, Song W, Yuan X. Broadband surface plasmon resonance sensor for fast spectroscopic photoacoustic microscopy. PHOTOACOUSTICS 2021; 24:100305. [PMID: 34956832 PMCID: PMC8674647 DOI: 10.1016/j.pacs.2021.100305] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 08/16/2021] [Accepted: 09/15/2021] [Indexed: 06/14/2023]
Abstract
High-speed optical-resolution photoacoustic microscopy (OR-PAM), integrating the merits of high spatial resolution and fast imaging acquisition, can observe dynamic processes of the optical absorption-based molecular specificities. However, it remains challenging for the evaluation to morphological and physiological parameters that are closely associated with photoacoustic spectrum due to the inadequate ultrasonic frequency response of the routinely-employed piezoelectric transducer. By utilizing the galvanometer for fast optical scanning and our previously-developed surface plasmon resonance sensor as an unfocused broadband ultrasonic detector, high-speed spectroscopic photoacoustic imaging was accessed in the OR-PAM system, achieving an acoustic bandwidth of ∼125 MHz and B-scan rate at ∼200 Hz over a scanning range of ∼0.5 mm. Our system demonstrated the dynamic imaging of the moving phantoms' structures and the simultaneous characterization of their photoacoustic spectra over time. Further, fast volumetric imaging and spectroscopic analysis of microanatomic features of a zebrafish eye ex vivo was obtained label-freely.
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Li L, Hsu H, Verkhusha VV, Wang LV, Shcherbakova DM. Multiscale Photoacoustic Tomography of a Genetically Encoded Near-Infrared FRET Biosensor. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2102474. [PMID: 34533889 PMCID: PMC8564460 DOI: 10.1002/advs.202102474] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 08/17/2021] [Indexed: 05/04/2023]
Abstract
Photoacoustic tomography (PAT) with genetically encoded near-infrared probes enables visualization of specific cell populations in vivo at high resolution deeply in biological tissues. However, because of a lack of proper probes, PAT of cellular dynamics remains unexplored. Here, the authors report a near-infrared Forster resonance energy transfer (FRET) biosensor based on a miRFP670-iRFP720 pair of the near-infrared fluorescent proteins, which enables dynamic functional imaging of active biological processes in deep tissues. By photoacoustically detecting the changes in the optical absorption of the miRFP670 FRET-donor, they monitored cell apoptosis in deep tissue at high spatiotemporal resolution using PAT. Specifically, they detected apoptosis in single cells at a resolution of ≈3 µm in a mouse ear tumor, and in deep brain tumors (>3 mm beneath the scalp) of living mice at a spatial resolution of ≈150 µm with a 20 Hz frame rate. These results open the way for high-resolution photoacoustic imaging of dynamic biological processes in deep tissues using NIR biosensors and PAT.
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Affiliation(s)
- Lei Li
- Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering and Department of Electrical EngineeringCalifornia Institute of TechnologyPasadenaCA91125USA
| | - Hsun‐Chia Hsu
- Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering and Department of Electrical EngineeringCalifornia Institute of TechnologyPasadenaCA91125USA
| | - Vladislav V. Verkhusha
- Medicum, Faculty of MedicineUniversity of HelsinkiHelsinki00290Finland
- Department of Anatomy and Structural Biology and Gruss‐Lipper Biophotonics CenterAlbert Einstein College of MedicineBronxNY10461USA
- Science Center for Genetics and Life SciencesSirius University of Science and TechnologySochi354340Russia
| | - Lihong V. Wang
- Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering and Department of Electrical EngineeringCalifornia Institute of TechnologyPasadenaCA91125USA
| | - Daria M. Shcherbakova
- Department of Anatomy and Structural Biology and Gruss‐Lipper Biophotonics CenterAlbert Einstein College of MedicineBronxNY10461USA
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Fang C, Zou J. Acoustic-resolution photoacoustic microscopy based on an optically transparent focused transducer with a high numerical aperture. OPTICS LETTERS 2021; 46:3280-3283. [PMID: 34197436 DOI: 10.1364/ol.423287] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 06/05/2021] [Indexed: 06/13/2023]
Abstract
This Letter reports acoustic-resolution-photoacoustic microscopy (AR-PAM) based on a new optically transparent focused polyvinylidene fluoride (PVDF) transducer with a high acoustic numerical aperture (NA) of 0.64. Owing to the improved fabrication process, the new transducer has a much higher NA (0.64) than the previously reported low-NA transducer (NA=0.23). The acoustic center frequency and (pulse-echo) bandwidth are also increased to 36 and 44 MHz, respectively, which provides a 38 µm acoustic focal spot size and 210 µm acoustic depth of focus. For demonstration, AR-PAM was conducted on a twisted wire target in water and chicken breast tissue, and in vivo on a mouse tail. The imaging results show that high acoustic resolution and sensitivity can be achieved with a simple and compact setup to resolve the target at different depths. Such capabilities can be useful for the development of new AR-PAM systems for handheld, wearable, and even endoscopic imaging applications.
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Abstract
Photoacoustic tomography (PAT) that integrates the molecular contrast of optical imaging with the high spatial resolution of ultrasound imaging in deep tissue has widespread applications in basic biological science, preclinical research, and clinical trials. Recently, tremendous progress has been made in PAT regarding technical innovations, preclinical applications, and clinical translations. Here, we selectively review the recent progresses and advances in PAT, including the development of advanced PAT systems for small-animal and human imaging, newly engineered optical probes for molecular imaging, broad-spectrum PAT for label-free imaging of biological tissues, high-throughput snapshot photoacoustic topography, and integration of machine learning for image reconstruction and processing. We envision that PAT will have further technical developments and more impactful applications in biomedicine.
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Affiliation(s)
- Lei Li
- Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, California Institute of Technology, 1200 East California Boulevard, Mail Code 138-78, Pasadena, CA 91125, USA
| | - Lihong V. Wang
- Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, California Institute of Technology, 1200 East California Boulevard, Mail Code 138-78, Pasadena, CA 91125, USA
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Yang F, Song W, Zhang C, Fang H, Min C, Yuan X. A Phase-Shifted Surface Plasmon Resonance Sensor for Simultaneous Photoacoustic Volumetric Imaging and Spectroscopic Analysis. ACS Sens 2021; 6:1840-1848. [PMID: 33861572 DOI: 10.1021/acssensors.1c00029] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
For biomedical photoacoustic applications, an ongoing challenge in simultaneous volumetric imaging and spectroscopic analysis arises from ultrasonic detectors lacking high sensitivity to pressure transients over a broad spectral bandwidth. Photoacoustic impulses can be measured on the basis of the ultrafast temporal dynamics and highly sensitive response of surface plasmon polaritons to the refractive index changes. Taking advantage of the ultra-sensitive phase shift of surface plasmons caused by ultrasonic perturbations instead of the reflectivity change [as is the case for traditional surface plasmon resonance (SPR) sensors], a novel SPR sensor based on phase-shifted interrogation was developed for the broadband measurement of photoacoustically induced pressure transients with improved detection sensitivity. Specifically, by encoding the acoustically modulated phase change into time-varying interference intensity, our sensor achieved an almost five-fold sensitivity enhancement (∼98 Pa noise-equivalent pressure) compared with the reflectivity-mode SPR sensing technologies (∼470 Pa) while retaining a broadband acoustic response of ∼174 MHz. Incorporating our sensor into an optical-resolution photoacoustic microscope, we performed label-free imaging of a zebrafish eye in vivo, enabling simultaneous volumetric visualization and spectrally resolved discrimination of anatomical features. This novel sensing technology has potential for advancing biomedical ultrasonic and/or photoacoustic investigations.
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Affiliation(s)
- Fan Yang
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
- Nanophotonics Research Center, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Wei Song
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
| | - Chonglei Zhang
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
| | - Hui Fang
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
| | - Changjun Min
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
| | - Xiaocong Yuan
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
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Li L, Li Y, Zhang Y, Wang LV. Snapshot photoacoustic topography through an ergodic relay of optical absorption in vivo. Nat Protoc 2021; 16:2381-2394. [PMID: 33846630 PMCID: PMC8186536 DOI: 10.1038/s41596-020-00487-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 12/16/2020] [Indexed: 02/02/2023]
Abstract
Photoacoustic tomography (PAT) has demonstrated versatile biomedical applications, ranging from tracking single cells to monitoring whole-body dynamics of small animals and diagnosing human breast cancer. Currently, PAT has two major implementations: photoacoustic computed tomography (PACT) and photoacoustic microscopy (PAM). PACT uses a multi-element ultrasonic array for parallel detection, which is relatively complex and expensive. In contrast, PAM requires point-by-point scanning with a single-element detector, which has a limited imaging throughput. The trade-off between the system cost and throughput demands a new imaging method. To this end, we have developed photoacoustic topography through an ergodic relay (PATER). PATER can capture a wide-field image with only a single-element ultrasonic detector upon a single laser shot. This protocol describes the detailed procedures for PATER system construction, including component selection, equipment setup and system alignment. A step-by-step guide for in vivo imaging of a mouse brain is provided as an example application. Data acquisition, image reconstruction and troubleshooting procedures are also elaborated. It takes ~130 min to carry out this protocol, including ~60 min for both calibration and snapshot wide-field data acquisition using a laser with a 2-kHz pulse repetition rate. PATER offers low-cost snapshot wide-field imaging of fast dynamics, such as visualizing blood pulse wave propagation and tracking melanoma tumor cell circulation in mice in vivo. We envision that PATER will have wide biomedical applications and anticipate that the compact size of the setup will allow it to be further developed as a wearable device to monitor human vital signs.
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Affiliation(s)
- Lei Li
- Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Yang Li
- Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Yide Zhang
- Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Lihong V Wang
- Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, California Institute of Technology, Pasadena, CA, USA.
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Li X, Tsang VTC, Kang L, Zhang Y, Wong TTW. High-speed high-resolution laser diode-based photoacoustic microscopy for in vivo microvasculature imaging. Vis Comput Ind Biomed Art 2021; 4:1. [PMID: 33426603 PMCID: PMC7797394 DOI: 10.1186/s42492-020-00067-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 12/22/2020] [Indexed: 11/10/2022] Open
Abstract
Laser diodes (LDs) have been considered as cost-effective and compact excitation sources to overcome the requirement of costly and bulky pulsed laser sources that are commonly used in photoacoustic microscopy (PAM). However, the spatial resolution and/or imaging speed of previously reported LD-based PAM systems have not been optimized simultaneously. In this paper, we developed a high-speed and high-resolution LD-based PAM system using a continuous wave LD, operating at a pulsed mode, with a repetition rate of 30 kHz, as an excitation source. A hybrid scanning mechanism that synchronizes a one-dimensional galvanometer mirror and a two-dimensional motorized stage is applied to achieve a fast imaging capability without signal averaging due to the high signal-to-noise ratio. By optimizing the optical system, a high lateral resolution of 4.8 μm has been achieved. In vivo microvasculature imaging of a mouse ear has been demonstrated to show the high performance of our LD-based PAM system.
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Affiliation(s)
- Xiufeng Li
- Translational and Advanced Bioimaging Laboratory, Department of Chemical and Biological Engineering, Hong Kong University of Science and Technology, Hong Kong, China
| | - Victor T C Tsang
- Translational and Advanced Bioimaging Laboratory, Department of Chemical and Biological Engineering, Hong Kong University of Science and Technology, Hong Kong, China
| | - Lei Kang
- Translational and Advanced Bioimaging Laboratory, Department of Chemical and Biological Engineering, Hong Kong University of Science and Technology, Hong Kong, China
| | - Yan Zhang
- Translational and Advanced Bioimaging Laboratory, Department of Chemical and Biological Engineering, Hong Kong University of Science and Technology, Hong Kong, China
| | - Terence T W Wong
- Translational and Advanced Bioimaging Laboratory, Department of Chemical and Biological Engineering, Hong Kong University of Science and Technology, Hong Kong, China.
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Li X, Kang L, Zhang Y, Wong TTW. High-speed label-free ultraviolet photoacoustic microscopy for histology-like imaging of unprocessed biological tissues. OPTICS LETTERS 2020; 45:5401-5404. [PMID: 33001904 DOI: 10.1364/ol.401643] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Ultraviolet photoacoustic microscopy (UV-PAM) has recently been demonstrated as a potential imaging tool for surgical margin analysis (SMA). UV-PAM does not require staining or micrometer-thick slicing, which is inevitable in conventional histological imaging. To promote UV-PAM as a practical intraoperative diagnostic tool, the imaging speed should be improved while preserving the high-resolution imaging capability and simplistic system design. In this Letter, we developed a galvanometer mirror-based UV-PAM (GM-UV-PAM) system for high-speed histology-like imaging. By using a UV laser with a high repetition rate (55 kHz) and a one-dimensional galvanometer mirror, our GM-UV-PAM system can generate subcellular images in less than 15 min for a typical brain biopsy (5mm×5mm), with a lateral resolution of ∼1.0µm. The images of mouse brain slices obtained by our GM-UV-PAM system show that it can provide histological information for SMA.
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Li Y, Li L, Zhu L, Shi J, Maslov K, Wang LV. Photoacoustic topography through an ergodic relay for functional imaging and biometric application in vivo. JOURNAL OF BIOMEDICAL OPTICS 2020; 25:1-8. [PMID: 32648387 PMCID: PMC7347463 DOI: 10.1117/1.jbo.25.7.070501] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 06/26/2020] [Indexed: 05/19/2023]
Abstract
SIGNIFICANCE Photoacoustic (PA) tomography has demonstrated versatile biomedical applications. However, an array-based PA computed tomography (PACT) system is complex and expensive, whereas a single-element detector-based scanning PA system is too slow to detect some fast biological dynamics in vivo. New PA imaging methods are sought after. AIM To overcome these limitations, we developed photoacoustic topography through an ergodic relay (PATER), a novel high-speed imaging system with a single-element detector. APPROACH PATER images widefield PA signals encoded by the acoustic ergodic relay with a single-laser shot. RESULTS We applied PATER in vivo to monitor changes in oxygen saturation in a mouse brain and also to demonstrate high-speed matching of vascular patterns for biometric authentication. CONCLUSIONS PATER has achieved a high-speed temporal resolution over a large field of view. Our results suggest that PATER is a promising and economical alternative to PACT for fast imaging.
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Affiliation(s)
- Yang Li
- California Institute of Technology, Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Pasadena, California, United States
- California Institute of Technology, Department of Electrical Engineering, Pasadena, California, United States
- Washington University in St. Louis, Department of Biomedical Engineering, St. Louis, Missouri, United States
| | - Lei Li
- California Institute of Technology, Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Pasadena, California, United States
- California Institute of Technology, Department of Electrical Engineering, Pasadena, California, United States
| | - Liren Zhu
- California Institute of Technology, Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Pasadena, California, United States
- California Institute of Technology, Department of Electrical Engineering, Pasadena, California, United States
- Washington University in St. Louis, Department of Biomedical Engineering, St. Louis, Missouri, United States
| | - Junhui Shi
- California Institute of Technology, Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Pasadena, California, United States
- California Institute of Technology, Department of Electrical Engineering, Pasadena, California, United States
| | - Konstantin Maslov
- California Institute of Technology, Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Pasadena, California, United States
| | - Lihong V. Wang
- California Institute of Technology, Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Pasadena, California, United States
- California Institute of Technology, Department of Electrical Engineering, Pasadena, California, United States
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Liang Y, Liu H, Li Q, Jin L, Guan BO, Wang L. Acoustic-spectrum-compensated photoacoustic microscopy. OPTICS LETTERS 2020; 45:1850-1853. [PMID: 32236015 DOI: 10.1364/ol.387087] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Photoacoustic microscopy (PAM) can label-free image oxy- and deoxy-hemoglobin (${{\rm HbO}_2}$HbO2 and Hb) concentrations in vivo, providing useful information for metabolic researches and diagnostic applications. Conventional PAM assumes a linear relationship between the photoacoustic amplitude and the absorption coefficient. However, many factors, including absorber size, laser pulse width, and frequency response of the ultrasound transducer, may affect the measured acoustic spectrum and the shape of the temporal photoacoustic signal. The ultrasound transducer may weigh the blood vessels differently according to their diameters. In addition, the pulse width also affects the photoacoustic signal amplitude. These factors may cause inaccurate measurement of Hb and ${{\rm HbO}_2}$HbO2 concentrations. To address this issue, we develop an acoustic-spectrum-compensated optical-resolution PAM (OR-PAM) that corrects the nonuniform acoustic spectrum and makes the quantitative results to be independent of the vessel diameter and pulse width. In dual-wavelength OR-PAM, we demonstrate that the acoustic spectrum compensation can improve the accuracy of oxygen saturation imaging by $\sim{15}\% $∼15%.
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Zhang P, Li L, Lin L, Shi J, Wang LV. In vivo superresolution photoacoustic computed tomography by localization of single dyed droplets. LIGHT, SCIENCE & APPLICATIONS 2019; 8:36. [PMID: 30962922 PMCID: PMC6445830 DOI: 10.1038/s41377-019-0147-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Revised: 03/21/2019] [Accepted: 03/22/2019] [Indexed: 05/03/2023]
Abstract
Photoacoustic (PA) computed tomography (PACT) is a noninvasive hybrid imaging technique that combines optical excitation and acoustic detection to realize high contrast, high resolution, and deep penetration in biological tissues. However, the spatial resolution of PACT is limited by acoustic diffraction. Here, we report in vivo superresolution PACT, which breaks the acoustic diffraction limit by localizing the centers of single dyed droplets that are flowing in blood vessels. The droplets were prepared by dissolving hydrophobic absorbing dye in oil, followed by mixing with water. The dyed droplets generate much higher-amplitude PA signals than blood and can flow smoothly in vessels; thus, they are excellent tracers for localization-based superresolution imaging. The in vivo resolution enhancement was demonstrated by continuously imaging the cortical layer of a mouse brain during droplet injection. The droplets that were flowing in the vessels were localized, and their center positions were used to construct a superresolution image that exhibits sharper features and more finely resolved vascular details. An improvement in spatial resolution by a factor of 6 has been realized in vivo by the droplet localization technique.
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Affiliation(s)
- Pengfei Zhang
- Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130 USA
- Present Address: School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin, 300072 China
| | - 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 USA
| | - Li Lin
- 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 USA
| | - Junhui Shi
- 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 USA
| | - 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 USA
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Choi H, Ju YJ, Jo JH, Ryu JM. Chromatic aberration free reflective mirror-based optical system design for multispectral photoacoustic instruments. Technol Health Care 2019; 27:397-406. [PMID: 31045556 PMCID: PMC6598014 DOI: 10.3233/thc-199036] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
BACKGROUND Current multispectral photoacoustic instruments must use large and separate combinational structures to obtain various biological tissue information for multispectral ranges. OBJECTIVE The optical aberration generated from the multispectral photoacoustic systems may reduce the image quality of biological tissue because the improper structures for combining light of different wavelength cannot produce good optical ray convergence points. To prevent this, complex combined structures need to be considered at the design level for multispectral photoacoustic systems. METHODS In place of an optical refracted lens system, reflective mirrors could be designed for optical systems. To verify our proposed idea, we assessed optical distortion performance using red, green, and blue light, and combined optical light sources to compare their chromatic aberration characteristics. RESULTS The high optical performance is realized regardless of the wavelength for a light source combined with multiple wavelengths, because our optical system was designed with only a reflective surface. CONCLUSIONS The designed optical system using a reflective mirror can provide multispectral optical sources (such as infrared, visible, and ultraviolet optical lights) with only one light ray path, without any chromatic aberrations.
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Affiliation(s)
- Hojong Choi
- Department of Medical Convergence Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea
| | - Yun Jae Ju
- Department of Photonics and Sensors, Hannam University, Daejon 34430, Korea
| | - Jae Heung Jo
- Department of Photonics and Sensors, Hannam University, Daejon 34430, Korea
| | - Jae-Myung Ryu
- Department of Optical Engineering, Kumoh National Institute of Technology, Gumi 39177, Korea
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21
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Qu Y, Li C, Shi J, Chen R, Xu S, Rafsanjani H, Maslov K, Krigman H, Garvey L, Hu P, Zhao P, Meyers K, Diveley E, Pizzella S, Muench L, Punyamurthy N, Goldstein N, Onwumere O, Alisio M, Meyenburg K, Maynard J, Helm K, Slaughter J, Barber S, Burger T, Kramer C, Chubiz J, Anderson M, McCarthy R, England SK, Macones GA, Zhou Q, Shung KK, Zou J, Stout MJ, Tuuli M, Wang LV. Transvaginal fast-scanning optical-resolution photoacoustic endoscopy. JOURNAL OF BIOMEDICAL OPTICS 2018; 23:1-4. [PMID: 30520276 PMCID: PMC6279961 DOI: 10.1117/1.jbo.23.12.121617] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Accepted: 11/05/2018] [Indexed: 05/07/2023]
Abstract
Photoacoustic endoscopy offers in vivo examination of the visceral tissue using endogenous contrast, but its typical B-scan rate is ∼10 Hz, restricted by the speed of the scanning unit and the laser pulse repetition rate. Here, we present a transvaginal fast-scanning optical-resolution photoacoustic endoscope with a 250-Hz B-scan rate over a 3-mm scanning range. Using this modality, we not only illustrated the morphological differences of vasculatures among the human ectocervix, uterine body, and sublingual mucosa but also showed the longitudinal and cross-sectional differences of cervical vasculatures in pregnant women. This technology is promising for screening the visceral pathological changes associated with angiogenesis.
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Affiliation(s)
- Yuan Qu
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
- Washington University in St. Louis, Department of Biomedical Engineering, St. Louis, Missouri, United States
| | - Chiye Li
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
- Washington University in St. Louis, Department of Biomedical Engineering, St. Louis, Missouri, United States
| | - Junhui Shi
- California Institute of Technology, Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering and Department of Electrical Engineering, Pasadena, California, United States
| | - Ruimin Chen
- University of Southern California, NIH Ultrasonic Transducer Resource Center, Department of Biomedical Engineering, Los Angeles, California, United States
| | - Song Xu
- Texas A&M University, Department of Electrical and Computer Engineering, College Station, Texas, United States
| | - Hasan Rafsanjani
- Texas A&M University, Department of Electrical and Computer Engineering, College Station, Texas, United States
| | - Konstantin Maslov
- California Institute of Technology, Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering and Department of Electrical Engineering, Pasadena, California, United States
| | - Hannah Krigman
- Washington University in St. Louis, Department of Pathology and Immunology, St. Louis, Missouri, United States
| | - Laura Garvey
- Washington University in St. Louis, Department of Pathology and Immunology, St. Louis, Missouri, United States
| | - Peng Hu
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
- Washington University in St. Louis, Department of Biomedical Engineering, St. Louis, Missouri, United States
| | - Peinan Zhao
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Karen Meyers
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Emily Diveley
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Stephanie Pizzella
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Lisa Muench
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Nina Punyamurthy
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Naomi Goldstein
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Oji Onwumere
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Mariana Alisio
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Kaytelyn Meyenburg
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Jennifer Maynard
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Kristi Helm
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Janessia Slaughter
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Sabrina Barber
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Tracy Burger
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Christine Kramer
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Jessica Chubiz
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Monica Anderson
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Ronald McCarthy
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Sarah K. England
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - George A. Macones
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
| | - Qifa Zhou
- University of Southern California, NIH Ultrasonic Transducer Resource Center, Department of Biomedical Engineering, Los Angeles, California, United States
| | - K. Kirk Shung
- University of Southern California, NIH Ultrasonic Transducer Resource Center, Department of Biomedical Engineering, Los Angeles, California, United States
| | - Jun Zou
- Texas A&M University, Department of Electrical and Computer Engineering, College Station, Texas, United States
| | - Molly J. Stout
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
- Address all correspondence to: Molly J. Stout, E-mail: ; Methodius Tuuli, E-mail: ; Lihong V. Wang, E-mail:
| | - Methodius Tuuli
- Washington University in St. Louis, March of Dimes Prematurity Research Center, Department of Obstetrics and Gynecology, St. Louis, Missouri, United States
- Address all correspondence to: Molly J. Stout, E-mail: ; Methodius Tuuli, E-mail: ; Lihong V. Wang, E-mail:
| | - Lihong V. Wang
- California Institute of Technology, Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering and Department of Electrical Engineering, Pasadena, California, United States
- Address all correspondence to: Molly J. Stout, E-mail: ; Methodius Tuuli, E-mail: ; Lihong V. Wang, E-mail:
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Lee C, Kim JY, Kim C. Recent Progress on Photoacoustic Imaging Enhanced with Microelectromechanical Systems (MEMS) Technologies. MICROMACHINES 2018; 9:E584. [PMID: 30413091 PMCID: PMC6266184 DOI: 10.3390/mi9110584] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 11/05/2018] [Accepted: 11/06/2018] [Indexed: 01/01/2023]
Abstract
Photoacoustic imaging (PAI) is a new biomedical imaging technology currently in the spotlight providing a hybrid contrast mechanism and excellent spatial resolution in the biological tissues. It has been extensively studied for preclinical and clinical applications taking advantage of its ability to provide anatomical and functional information of live bodies noninvasively. Recently, microelectromechanical systems (MEMS) technologies, particularly actuators and sensors, have contributed to improving the PAI system performance, further expanding the research fields. This review introduces cutting-edge MEMS technologies for PAI and summarizes the recent advances of scanning mirrors and detectors in MEMS.
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Affiliation(s)
- Changho Lee
- Department of Nuclear Medicine, Chonnam National University Medical School & Hwasun Hospital, Hwasun 58128, Korea.
| | - Jin Young Kim
- Departments of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea.
| | - Chulhong Kim
- Departments of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea.
- Departments of Creative IT Engineering and Electrical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea.
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Liang Y, Liu JW, Jin L, Guan BO, Wang L. Fast-scanning photoacoustic microscopy with a side-looking fiber optic ultrasound sensor. BIOMEDICAL OPTICS EXPRESS 2018; 9:5809-5816. [PMID: 30460163 PMCID: PMC6238919 DOI: 10.1364/boe.9.005809] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 10/09/2018] [Accepted: 10/16/2018] [Indexed: 05/09/2023]
Abstract
Optical-resolution photoacoustic microscopy (OR-PAM) images biological tissue with sub-cellular resolution and optical absorption contrast. OR-PAM is limited by the tradeoff among imaging speed, field of view, and sensitivity. In this work, we present an OR-PAM technique based on an unfocused side-looking fiber optic ultrasound (FOUS) sensor, which achieves high imaging speed, large field of view, and good sensitivity for in vivo imaging. The FOUS sensor is developed based on a dual-polarized fiber laser and read out with real-time frequency demodulation. Via minimizing the readout noise, the sensor offers a noise-equivalent pressure of 43.6 Pa, enabling high detection sensitivity over a large field of view. High imaging speed is achieved via scanning the laser beam with a 2D galvo mirror in the ultrasound detection area. Microvascular imaging with a frame rate of 2 Hz over a 2 × 2 mm2 area has been demonstrated in the mouse ear. The new OR-PAM technique may be used in the visualization of biological and physiologic dynamics.
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Affiliation(s)
- Yizhi Liang
- Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
- Department of Mechanical and Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Ave, Kowloon, Hong Kong SAR, China
| | - Jin-Wei Liu
- Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
| | - Long Jin
- Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
| | - Bai-Ou Guan
- Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
| | - Lidai Wang
- Department of Mechanical and Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Ave, Kowloon, Hong Kong SAR, China
- City University of Hong Kong Shenzhen Research Institute, Yuexing Yi Dao, Nanshan District, Shenzhen, Guang Dong, 518057, China
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Zhang Z, Shi Y, Xiang L, Xing D. Polarized photoacoustic microscopy for vectorial-absorption-based anisotropy detection. OPTICS LETTERS 2018; 43:5267-5270. [PMID: 30382984 DOI: 10.1364/ol.43.005267] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 09/28/2018] [Indexed: 06/08/2023]
Abstract
We proposed polarized photoacoustic microscopy (PPAM) for quantitative detection of a target's microscopic anisotropy based on the vectorial optical absorption by applying four linearly polarized laser beams as excitation sources. Compared to conventional photoacoustic microscopy that treats targets as isotropic absorbers, PPAM allows us to quantitatively detect the target's anisotropic features beyond optical absorption with a newly proposed parameter valued between 0 and 1. The feasibility of the method was validated by dichroic phantoms. The dichroic compound eyes of mantis shrimps were imaged in situ to demonstrate the method's capability for quantitative three-dimensional biological imaging. The PPAM method provides an effective and straightforward strategy for tissue polarimetry, prefiguring great potential for biological imaging and material inspection.
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25
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Yang F, Song W, Zhang C, Min C, Fang H, Du L, Wu P, Zheng W, Li C, Zhu S, Yuan X. Broadband graphene-based photoacoustic microscopy with high sensitivity. NANOSCALE 2018; 10:8606-8614. [PMID: 29696248 DOI: 10.1039/c7nr09319e] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Photoacoustic microscopy (PAM) enables the measurement of properties associated with optical absorption within tissues and complements sophisticated technologies employing optical microscopy. An inadequate frequency response as determined by a piezoelectric ultrasonic transducer results, however, in poor depth resolution and inaccurate measurements of the coefficients of optical absorption. We developed a PAM system configured as an attenuated total reflectance sensor with a ten-layer graphene film sandwiched between a prism and water (the coupling medium) for photoacoustic (PA) wave detection. Transients of the PA pressure cause perturbations in the refractive index of the water thereby changing the polarization-dependent absorption of the graphene film. The signal in PA detection involves recording the difference in the temporal-varying reflectance intensity between the two orthogonally polarized probe beams. The graphene-based sensor has an estimated noise-equivalent-pressure sensitivity of ∼550 Pa over an approximately linear pressure response from 11.0 kPa to 55.0 kPa. Moreover, it enables a much broader PA bandwidth detection of up to ∼150 MHz, primarily dominated by a highly localized evanescent field. From the strong optical absorption of inherent hemoglobin, in vivo label-free PAM imaging provided a three-dimensional viewing of the microvasculature of a mouse ear. These results suggest great potential for graphene-based PAM in biomedical investigations, such as microcirculation studies.
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Affiliation(s)
- Fan Yang
- Nanophotonics Research Centre, Shenzhen University, Shenzhen 518060, China.
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Jin T, Guo H, Yao L, Xie H, Jiang H, Xi L. Portable optical-resolution photoacoustic microscopy for volumetric imaging of multiscale organisms. JOURNAL OF BIOPHOTONICS 2018; 11:e201700250. [PMID: 29064190 DOI: 10.1002/jbio.201700250] [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: 09/04/2017] [Revised: 10/15/2017] [Accepted: 10/22/2017] [Indexed: 05/22/2023]
Abstract
Photoacoustic microscopy (PAM) provides a fundamentally new tool for a broad range of studies of biological structures and functions. However, the use of PAM has been largely limited to small vertebrates due to the large size/weight and the inconvenience of the equipment. Here, we describe a portable optical-resolution photoacoustic microscopy (pORPAM) system for 3-dimensional (3D) imaging of small-to-large rodents and humans with a high spatiotemporal resolution and a large field of view. We show extensive applications of pORPAM to multiscale animals including mice and rabbits. In addition, we image the 3D vascular networks of human lips, and demonstrate the feasibility of pORPAM to observe the recovery process of oral ulcer and cancer-associated capillary loops in human oral cavities. This technology is promising for broad biomedical studies from fundamental biology to clinical diseases.
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Affiliation(s)
- Tian Jin
- School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, China
| | - Heng Guo
- School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, China
| | - Lei Yao
- School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, China
- Center for Information in Biomedicine, University of Electronic Science and Technology of China, Chengdu, China
| | - Huikai Xie
- Department of Electrical and Computer Engineering, University of Florida, Gainesville, Florida
| | - Huabei Jiang
- School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, China
- Center for Information in Biomedicine, University of Electronic Science and Technology of China, Chengdu, China
- Department of Medical Engineering, University of South Florida, Tampa, Florida
| | - Lei Xi
- School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, China
- Center for Information in Biomedicine, University of Electronic Science and Technology of China, Chengdu, China
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27
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Qin W, Jin T, Guo H, Xi L. Large-field-of-view optical resolution photoacoustic microscopy. OPTICS EXPRESS 2018; 26:4271-4278. [PMID: 29475278 DOI: 10.1364/oe.26.004271] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Accepted: 01/25/2018] [Indexed: 05/18/2023]
Abstract
The use of existing optical resolution photoacoustic microscopy (ORPAM) has been limited to small organs or part of large organs due to the millimeter-scale field of view (FOV) in both lateral and axial directions. Here, we report a large-field-of-view ORPAM (L-ORPAM) using a combination of a new scanning mechanism and an ultrafast pulsed laser. Phantom and in vivo experiments show that L-ORPAM has a spatial FOV of 40 mm in lateral and 12 mm in axial, which expends the effective imaging domain to one order that of existing ORPAMs. To show the advantages of L-ORPAM, we apply it to imaging vasculatures of both brain and ears simultaneously in mice, and to visualizing intestinal vasculatures in rats. The result suggests that L-ORPAM has sufficient contrast, resolution and spatial FOV to carry out studies of large rodents.
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Allen TJ, Ogunlade O, Zhang E, Beard PC. Large area laser scanning optical resolution photoacoustic microscopy using a fibre optic sensor. BIOMEDICAL OPTICS EXPRESS 2018; 9:650-660. [PMID: 29552402 PMCID: PMC5854068 DOI: 10.1364/boe.9.000650] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 12/23/2017] [Accepted: 12/23/2017] [Indexed: 05/18/2023]
Abstract
A laser scanning optical resolution photoacoustic microscopy (LS OR-PAM) system based on a stationary fibre optic sensor is described. The sensor comprises an optically resonant interferometric polymer cavity formed on the tip of a rounded single mode optical fibre. It provides low noise equivalent pressure (NEP = 68.7 Pa over a 20 MHz measurement bandwidth), a broad bandwidth that extends to 80 MHz and a near omnidirectional response. The latter is a significant advantage, as it allows large areas (>1cm2) to be imaged without the need for translational mechanical scanning offering the potential for fast image acquisition. The system provides a lateral resolution of 8 µm, an axial resolution of 21 µm, and a field of view up to 10 mm × 10 mm. To demonstrate the system, in vivo 3D structural images of the microvasculature of a mouse ear were obtained, showing single capillaries overlaying larger vessels as well as functional images revealing blood oxygen saturation.
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Li L, Zhu L, Shen Y, Wang LV. Multiview Hilbert transformation in full-ring transducer array-based photoacoustic computed tomography. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:76017. [PMID: 28745385 PMCID: PMC5527266 DOI: 10.1117/1.jbo.22.7.076017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 07/12/2017] [Indexed: 05/20/2023]
Abstract
Based on the photoacoustic (PA) effect, PA tomography directly measures specific optical absorption, i.e., absorbed optical energy per unit volume. We recently developed a full-ring ultrasonic transducer array-based photoacoustic computed tomography (PACT) system for small-animal whole-body imaging. The system has a full-view detection angle and high in-plane resolution (∼100 μm). However, due to the bandpass frequency response of the piezoelectric transducer elements and the limited elevational detection coverage of the full-ring transducer array, the reconstructed images present bipolar (i.e., both positive and negative) pixel values, which cause ambiguities in image interpretation for physicians and biologists. We propose a multiview Hilbert transformation method to recover the unipolar initial pressure for full-ring PACT. The effectiveness of the proposed algorithm was first validated by numerical simulations and then demonstrated with ex vivo mouse brain structural imaging and in vivo mouse whole-body imaging.
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Affiliation(s)
- Lei Li
- Washington University in St. Louis, Department of Electrical and System Engineering, St. Louis, Missouri, United States
- California Institute of Technology, Andrew and Peggy Cherng Department of Medical Engineering, Caltech Optical Imaging Laboratory, Pasadena, California, United States
| | - Liren Zhu
- California Institute of Technology, Andrew and Peggy Cherng Department of Medical Engineering, Caltech Optical Imaging Laboratory, Pasadena, California, United States
- Washington University in St. Louis, Department of Biomedical Engineering, St. Louis, Missouri, United States
| | - Yuecheng Shen
- California Institute of Technology, Andrew and Peggy Cherng Department of Medical Engineering, Caltech Optical Imaging Laboratory, Pasadena, California, United States
| | - Lihong V. Wang
- California Institute of Technology, Andrew and Peggy Cherng Department of Medical Engineering, Caltech Optical Imaging Laboratory, Pasadena, California, United States
- California Institute of Technology, Department of Electrical Engineering, Caltech Optical Imaging Laboratory, Pasadena, California, United States
- Address all correspondence to: Lihong V. Wang, E-mail:
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Ma H, Yang S, Cheng Z, Xing D. Photoacoustic confocal dermoscope with a waterless coupling and impedance matching opto-sono probe. OPTICS LETTERS 2017; 42:2342-2345. [PMID: 28614306 DOI: 10.1364/ol.42.002342] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 05/22/2017] [Indexed: 05/25/2023]
Abstract
Recently, intensive research on photoacoustic (PA) imaging has been conducted to accelerate the development of dermoscopy of the human skin. In this Letter, we first developed a PA dermoscope equipped with a waterless coupling and impedance matching opto-sono probe to achieve quantitative, high-resolution, and high-contrast imaging of the human skin. Compared with the commonly used liquid-coupled PA probes, the human-skin-adapted probe can facilitate implementation in the clinical setting. The noninvasive imaging experiments of epidermal and dermal structures in volunteers have been carried out to demonstrate the high imaging quality that can be obtained by using such an opto-sono probe for a PA dermoscope. The imaging results show the characteristic parameters of the skin, including pigment distribution and thickness, vascular diameter, and depth. The results confirm that the opto-sono probe can play an important role in the PA dermoscope for making clear the distribution of the pigment layer and blood vessels in the human skin.
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Liang Y, Jin L, Guan BO, Wang L. 2 MHz multi-wavelength pulsed laser for functional photoacoustic microscopy. OPTICS LETTERS 2017; 42:1452-1455. [PMID: 28362790 DOI: 10.1364/ol.42.001452] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Fast functional photoacoustic microscopy requires multi-wavelength pulsed laser sources with high pulse repetition rates, short wavelength switching time, and sufficient pulse energies. Here, we report the development of a stimulated-Raman-scattering-based multi-wavelength pulsed laser source for fast functional photoacoustic imaging. The new laser source is pumped with a 532 nm 1 MHz pulsed laser. The 532 nm laser beam is split into two: one pumps a 5 m optical fiber to excite a 558 nm wavelength via stimulated Raman scattering; the other goes through a 50 m optical fiber to delay the 532 nm pulse by 220 ns. The two beams are combined and coupled into an optical fiber for photoacoustic excitation. As a result, the new laser source can generate 2 million pulses per second, switch wavelengths in 220 ns, and provide hundreds of nanojoules pulse energy for each wavelength. Using this laser source, we demonstrate optical-resolution photoacoustic imaging of microvascular structures and oxygen saturation in the mouse ear. The ultrashort wavelength switching time enables oxygen saturation imaging of flowing red blood cells, which is valuable for high-resolution functional imaging.
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Choi H, Ryu JM, Yeom JY. Development of a Double-Gauss Lens Based Setup for Optoacoustic Applications. SENSORS 2017; 17:s17030496. [PMID: 28273794 PMCID: PMC5375782 DOI: 10.3390/s17030496] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2016] [Revised: 01/23/2017] [Accepted: 02/10/2017] [Indexed: 12/28/2022]
Abstract
In optoacoustic (photoacoustic) systems, different echo signal intensities such as amplitudes, center frequencies, and bandwidths need to be compensated by utilizing variable gain or time-gain compensation amplifiers. However, such electronic components can increase system complexities and signal noise levels. In this paper, we introduce a double-Gauss lens to generate a large field of view with uniform light intensity due to the low chromatic aberrations of the lens, thus obtaining uniform echo signal intensities across the field of view of the optoacoustic system. In order to validate the uniformity of the echo signal intensities in the system, an in-house transducer was placed at various positions above a tissue sample and echo signals were measured and compared with each other. The custom designed double-Gauss lens demonstrated negligible light intensity variation (±1.5%) across the illumination field of view (~2 cm diameter). When the transducer was used to measure echo signal from an eye of a bigeye tuna within a range of ±1 cm, the peak-to-peak amplitude, center frequency, and their −6 dB bandwidth variations were less than 2 mV, 1 MHz, and 6%, respectively. The custom designed double-Gauss lens can provide uniform light beam across a wide area while generating insignificant echo signal variations, and thus can lower the burden of the receiving electronics or signal processing in the optoacoustic system.
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Affiliation(s)
- Hojong Choi
- Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea.
| | - Jae-Myung Ryu
- Department of Optical System Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea.
| | - Jung-Yeol Yeom
- School of Biomedical Engineering, Korea University, Seoul 02841, Korea.
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Preisser S, Rohringer W, Liu M, Kollmann C, Zotter S, Fischer B, Drexler W. All-optical highly sensitive akinetic sensor for ultrasound detection and photoacoustic imaging. BIOMEDICAL OPTICS EXPRESS 2016; 7:4171-4186. [PMID: 27867723 PMCID: PMC5102516 DOI: 10.1364/boe.7.004171] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 09/07/2016] [Accepted: 09/12/2016] [Indexed: 05/03/2023]
Abstract
A novel all-optical akinetic ultrasound sensor, consisting of a rigid, fiber-coupled Fabry-Pérot etalon with a transparent central opening is presented. The sensing principle relies exclusively on the detection of pressure-induced changes of the refractive index in the fluid filling the Fabry-Pérot cavity. This enables resonance-free, inherently linear signal detection over a broad bandwidth. We demonstrate that the sensor achieves a exceptionally low peak noise equivalent pressure (NEP) values of 2 Pa over a 20 MHz measurement bandwidth (without signal averaging), while maintaining a flat frequency response, and a detection bandwidth up to 22.5 MHz (-6 dB). The measured large full field of view of the sensor is 2.7 mm × 1.3 mm and the dynamic range is [Formula: see text] or 63 dB at 20 MHz bandwidth. For different required amplitude ranges the upper amplitude detection limit can be customized from at least 2 kPa to 2 MPa by using cavity mirrors with a lower optical reflectivity. Imaging tests on a resolution target and on biological tissue show the excellent suitability of the akinetic sensor for optical resolution photoacoustic microscopy (OR-PAM) applications.
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Affiliation(s)
- Stefan Preisser
- XARION Laser Acoustics GmbH, Ghegastraße 3, 1030, Vienna,
Austria
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Währinger Gürtel 18-20, AKH 4L, 1090, Vienna,
Austria
| | - Wolfgang Rohringer
- XARION Laser Acoustics GmbH, Ghegastraße 3, 1030, Vienna,
Austria
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Währinger Gürtel 18-20, AKH 4L, 1090, Vienna,
Austria
| | - Mengyang Liu
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Währinger Gürtel 18-20, AKH 4L, 1090, Vienna,
Austria
| | - Christian Kollmann
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Währinger Gürtel 18-20, AKH 4L, 1090, Vienna,
Austria
| | - Stefan Zotter
- XARION Laser Acoustics GmbH, Ghegastraße 3, 1030, Vienna,
Austria
| | | | - Wolfgang Drexler
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Währinger Gürtel 18-20, AKH 4L, 1090, Vienna,
Austria
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Wang T, Sun N, Cao R, Ning B, Chen R, Zhou Q, Hu S. Multiparametric photoacoustic microscopy of the mouse brain with 300-kHz A-line rate. NEUROPHOTONICS 2016; 3:045006. [PMID: 27981062 PMCID: PMC5129190 DOI: 10.1117/1.nph.3.4.045006] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 11/08/2016] [Indexed: 05/05/2023]
Abstract
Enabling simultaneous high-resolution imaging of the total concentration of hemoglobin ([Formula: see text]), oxygen saturation of hemoglobin ([Formula: see text]), and cerebral blood flow (CBF), multiparametric photoacoustic microscopy (PAM) holds the potential to quantify the cerebral metabolic rate of oxygen at the microscopic level. However, its imaging speed has been severely limited by the pulse repetition rate of the dual-wavelength photoacoustic excitation and the scanning mechanism. To address these limitations, we have developed a new generation of multiparametric PAM. Capitalizing on a self-developed high-repetition dual-wavelength pulsed laser and an optical-mechanical hybrid-scan configuration, this innovative technique has achieved an unprecedented A-line rate of 300 kHz, leading to a 20-fold increase in the imaging speed over our previously reported multiparametric PAM that is based on pure mechanical scanning. The performance of the high-speed multiparametric PAM has been examined both in vitro and in vivo. Simultaneous PAM of microvascular [Formula: see text], [Formula: see text], and CBF in absolute values over a [Formula: see text]-mm-diameter brain region of interest can be accomplished within 10 min.
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Affiliation(s)
- Tianxiong Wang
- University of Virginia, Department of Biomedical Engineering, 415 Lane Road, Charlottesville, Virginia 22908, United States
| | - Naidi Sun
- University of Virginia, Department of Biomedical Engineering, 415 Lane Road, Charlottesville, Virginia 22908, United States
| | - Rui Cao
- University of Virginia, Department of Biomedical Engineering, 415 Lane Road, Charlottesville, Virginia 22908, United States
| | - Bo Ning
- University of Virginia, Department of Biomedical Engineering, 415 Lane Road, Charlottesville, Virginia 22908, United States
| | - Ruimin Chen
- University of Southern California, Department of Biomedical Engineering, 1042 Downey Way, Los Angeles, California 90089, United States
| | - Qifa Zhou
- University of Southern California, Department of Biomedical Engineering, 1042 Downey Way, Los Angeles, California 90089, United States
| | - Song Hu
- University of Virginia, Department of Biomedical Engineering, 415 Lane Road, Charlottesville, Virginia 22908, United States
- Address all correspondence to: Song Hu, E-mail:
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Photodynamic Therapy-Induced Microvascular Changes in a Nonmelanoma Skin Cancer Model Assessed by Photoacoustic Microscopy and Diffuse Correlation Spectroscopy. PHOTONICS 2016. [DOI: 10.3390/photonics3030048] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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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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Schwarz M, Buehler A, Aguirre J, Ntziachristos V. Three-dimensional multispectral optoacoustic mesoscopy reveals melanin and blood oxygenation in human skin in vivo. JOURNAL OF BIOPHOTONICS 2016; 9:55-60. [PMID: 26530688 DOI: 10.1002/jbio.201500247] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Revised: 10/12/2015] [Accepted: 10/13/2015] [Indexed: 05/21/2023]
Abstract
Optical imaging plays a major role in disease detection in dermatology. However, current optical methods are limited by lack of three-dimensional detection of pathophysiological parameters within skin. It was recently shown that single-wavelength optoacoustic (photoacoustic) mesoscopy resolves skin morphology, i.e. melanin and blood vessels within epidermis and dermis. In this work we employed illumination at multiple wavelengths for enabling three-dimensional multispectral optoacoustic mesoscopy (MSOM) of natural chromophores in human skin in vivo operating at 15-125 MHz. We employ a per-pulse tunable laser to inherently co-register spectral datasets, and reveal previously undisclosed insights of melanin, and blood oxygenation in human skin. We further reveal broadband absorption spectra of specific skin compartments. We discuss the potential of MSOM for label-free visualization of physiological biomarkers in skin in vivo.
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Affiliation(s)
- Mathias Schwarz
- Chair for Biological Imaging, Technische Universität München, Ismaningerstr. 22, 81675, München, Germany
- Institute for Biological and Medical Imaging, Helmholtz Zentrum München GmbH, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Andreas Buehler
- Chair for Biological Imaging, Technische Universität München, Ismaningerstr. 22, 81675, München, Germany
- Institute for Biological and Medical Imaging, Helmholtz Zentrum München GmbH, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Juan Aguirre
- Chair for Biological Imaging, Technische Universität München, Ismaningerstr. 22, 81675, München, Germany
- Institute for Biological and Medical Imaging, Helmholtz Zentrum München GmbH, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Vasilis Ntziachristos
- Chair for Biological Imaging, Technische Universität München, Ismaningerstr. 22, 81675, München, Germany.
- Institute for Biological and Medical Imaging, Helmholtz Zentrum München GmbH, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany.
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38
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Lee SY, Lai YH, Huang KC, Cheng YH, Tseng TF, Sun CK. In vivo sub-femtoliter resolution photoacoustic microscopy with higher frame rates. Sci Rep 2015; 5:15421. [PMID: 26487363 PMCID: PMC4614074 DOI: 10.1038/srep15421] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 09/18/2015] [Indexed: 11/17/2022] Open
Abstract
Microscopy based on non-fluorescent absorption dye staining is widely used in various fields of biomedicine for 400 years. Unlike its fluorescent counterpart, non-fluorescent absorption microscopy lacks proper methodologies to realize its in vivo applications with a sub-femtoliter 3D resolution. Regardless of the most advanced high-resolution photoacoustic microscopy, sub-femtoliter spatial resolution is still unattainable, and the imaging speed is relatively slow. In this paper, based on the two-photon photoacoustic mechanism, we demonstrated a in vivo label free laser-scanning photoacoustic imaging modality featuring high frame rates and sub-femtoliter 3D resolution simultaneously, which stands as a perfect solution to 3D high resolution non-fluorescent absorption microscopy. Furthermore, we first demonstrated in vivo label-free two-photon acoustic microscopy on the observation of non-fluorescent melanin distribution within mouse skin.
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Affiliation(s)
- Szu-Yu Lee
- Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan
| | - Yu-Hung Lai
- Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan
- Applied Physics Option, California Institute of Technology, Pasadena, CA 91125, USA
| | - Kai-Chih Huang
- Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan
| | - Yu-Hsiang Cheng
- Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan
| | - Tzu-Fang Tseng
- Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan
| | - Chi-Kuang Sun
- Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan
- Institute of Physics and Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan
- Molecular Imaging Center and Graduate Institute of Biomedical Electronics and Bioinformatics, National Taiwan University, Taipei 10617, Taiwan
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Cao R, Kilroy JP, Ning B, Wang T, Hossack JA, Hu S. Multispectral photoacoustic microscopy based on an optical-acoustic objective. PHOTOACOUSTICS 2015; 3:55-9. [PMID: 26236641 PMCID: PMC4519805 DOI: 10.1016/j.pacs.2014.12.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Revised: 12/10/2014] [Accepted: 12/26/2014] [Indexed: 05/15/2023]
Abstract
We have developed reflection-mode multispectral photoacoustic microscopy (PAM) based on a novel optical-acoustic objective that integrates a customized ultrasonic transducer and a commercial reflective microscope objective into one solid piece. This technical innovation provides zero chromatic aberration and convenient confocal alignment of the optical excitation and acoustic detection. With a wavelength-tunable optical-parametric-oscillator laser, we have demonstrated multispectral PAM over an ultrabroad spectral range of 270-1300 nm. A near-constant lateral resolution of ∼2.8 μm is achieved experimentally. Capitalizing on the consistent performance over the ultraviolet, visible, and near-infrared range, multispectral PAM enables label-free concurrent imaging of cell nucleus (DNA/RNA contrast at 270 nm), blood vessel (hemoglobin contrast at 532 nm), and sebaceous gland (lipid contrast at 1260 nm) at the same spatial scale in a living mouse ear.
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Affiliation(s)
| | | | | | | | | | - Song Hu
- Department of Biomedical Engineering, University of Virginia, Charlottesville, VA 22908, United States
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40
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Yeh C, Soetikno B, Hu S, Maslov KI, Wang LV. Three-dimensional arbitrary trajectory scanning photoacoustic microscopy. JOURNAL OF BIOPHOTONICS 2015; 8:303-8. [PMID: 25077689 PMCID: PMC4312269 DOI: 10.1002/jbio.201400055] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 06/27/2014] [Accepted: 07/02/2014] [Indexed: 05/07/2023]
Abstract
We have enhanced photoacoustic microscopy with three-dimensional arbitrary trajectory (3-DAT) scanning, which can rapidly image selected vessels over a large field of view (FOV) and maintain a high signal-to-noise ratio (SNR) despite the depth variation of the vessels. We showed that hemoglobin oxygen saturation (sO2 ) and blood flow can be measured simultaneously in a mouse ear in vivo at a frame rate 67 times greater than that of a traditional two-dimensional raster scan. We also observed sO2 dynamics in response to switching from systemic hypoxia to hyperoxia. 3-DAT-scanning photoacoustic microscopy. Schematic diagram of the 3D scanning stage and method.
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Affiliation(s)
- Chenghung Yeh
- Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Dr., St. Louis, MO 63130, USA
| | - Brian Soetikno
- Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Dr., St. Louis, MO 63130, USA
| | - Song Hu
- Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Dr., St. Louis, MO 63130, USA
- Department of Biomedical Engineering, University of Virginia, PO Box 800759, Charlottesville, VA 22908, USA
| | - Konstantin I. Maslov
- Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Dr., St. Louis, MO 63130, USA
| | - Lihong V. Wang
- Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Dr., St. Louis, MO 63130, USA
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41
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U-Thainual P, Yang Y, Le HND, Kim DH. Radiant exposure level comparison between Gaussian and top hat beams in various scanning patterns. APPLIED OPTICS 2014; 53:8585-8592. [PMID: 25608209 DOI: 10.1364/ao.53.008585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The radiant exposure of optical irradiation beams with different scanning parameters has been theoretically studied. We analyzed the difference in radiant exposure introduced by Gaussian and top hat beams. Various parameters such as scanning pattern, aperture position, beam size and scan spacing were also introduced in this study. We found that Gaussian beams introduce higher calculated radiant exposure to the aperture than top hat beams for certain beam size to aperture size ratios. However, as the scan spacing decreases, the radiant exposure difference calculated from Gaussian and top hat beams diminishes.
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42
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Song W, Zheng W, Liu R, Lin R, Huang H, Gong X, Yang S, Zhang R, Song L. Reflection-mode in vivo photoacoustic microscopy with subwavelength lateral resolution. BIOMEDICAL OPTICS EXPRESS 2014; 5:4235-41. [PMID: 25574435 PMCID: PMC4285601 DOI: 10.1364/boe.5.004235] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Revised: 10/13/2014] [Accepted: 10/15/2014] [Indexed: 05/18/2023]
Abstract
We developed a reflection-mode subwavelength-resolution photoacoustic microscopy system capable of imaging optical absorption contrast in vivo. The simultaneous high-resolution and reflection-mode imaging capacity of the system was enabled by delicately configuring a miniature high-frequency ultrasonic transducer tightly under a water-immersion objective with numerical aperture of 1.0. At 532-nm laser illumination, the lateral resolution of the system was measured to be ~320 nm. With this system, subcellular structures of red blood cells and B16 melanoma cells were resolved ex vivo; microvessels, including individual capillaries, in a mouse ear were clearly imaged label-freely in vivo, using the intrinsic optical absorption from hemoglobin. The current study suggests that, the optical-absorption contrast, subwavelength resolution, and reflection-mode ability of the developed photoacoustic microscopy may empower a wide range of biomedical studies for visualizing cellular and/or subcellular structures.
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Affiliation(s)
- Wei Song
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Boulevard, Nanshan, Shenzhen 518055,
China
- Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150080,
China
- Authors contributed equally to this work
| | - Wei Zheng
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Boulevard, Nanshan, Shenzhen 518055,
China
- Authors contributed equally to this work
| | - Ruimin Liu
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Boulevard, Nanshan, Shenzhen 518055,
China
- Authors contributed equally to this work
| | - Riqiang Lin
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Boulevard, Nanshan, Shenzhen 518055,
China
| | - Hongtao Huang
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Boulevard, Nanshan, Shenzhen 518055,
China
| | - Xiaojing Gong
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Boulevard, Nanshan, Shenzhen 518055,
China
| | - Shousheng Yang
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Boulevard, Nanshan, Shenzhen 518055,
China
| | - Rui Zhang
- Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150080,
China
| | - Liang Song
- Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Boulevard, Nanshan, Shenzhen 518055,
China
- Beijing Center for Mathematics and Information Interdisciplinary Sciences (BCMIIS), Beijing,
China
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Morscher S, Driessen WH, Claussen J, Burton NC. Semi-quantitative Multispectral Optoacoustic Tomography (MSOT) for volumetric PK imaging of gastric emptying. PHOTOACOUSTICS 2014; 2:103-10. [PMID: 25431754 PMCID: PMC4244636 DOI: 10.1016/j.pacs.2014.06.001] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Revised: 04/17/2014] [Accepted: 06/18/2014] [Indexed: 05/08/2023]
Abstract
A common side effect of medication is gastrointestinal intolerance. Symptoms can include reduced appetite, diarrhea, constipation, GI inflammation, nausea and vomiting. Such effects often have a dramatic impact on compliance with a treatment regimen. Therefore, characterization of GI tolerance is an important step when establishing a novel therapeutic approach. In this study, Multispectral Optoacoustic Tomography (MSOT) is used to monitor gastrointestinal motility by in vivo whole body imaging in mice. MSOT combines high spatial and temporal resolution based on ultrasound detection with strong optical contrast in the near infrared. Animals were given Indocyanine Green (ICG) by oral gavage and imaged by MSOT to observe the fate of ICG in the gastrointestinal tract. Exponential decay of ICG signal was observed in the stomach in good correlation with ex vivo validation. We discuss how kinetic imaging in MSOT allows visualization of parameters unavailable to other imaging methods, both in 2D and 3D.
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Zhu L, Li L, Gao L, Wang LV. Multi-view optical resolution photoacoustic microscopy. OPTICA 2014; 1:217-222. [PMID: 25558469 PMCID: PMC4280660 DOI: 10.1364/optica.1.000217] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Optical resolution photoacoustic microscopy (OR-PAM), while providing high lateral resolution, has been limited by its relatively poor acoustically determined axial resolution. Although this limitation has been tackled in recent works by using either broadband acoustic detection or nonlinear photoacoustic effects, a flexible solution with three dimensional optical resolution in reflection mode remains desired. Herein we present a multi-view OR-PAM technique. By imaging the sample from multiple view angles and reconstructing the data using a multi-view deconvolution method, we have experimentally demonstrated an isotropic optical resolution in three dimensions.
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Affiliation(s)
- Liren Zhu
- Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA
| | - Lei Li
- Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA
- Department of Electrical and System Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA
| | - Liang Gao
- Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA
| | - Lihong V. Wang
- Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA
- Corresponding author:
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