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Article ; Online: Polarization patterns of light enable geolocalization in oceans.

Wang, Lihong V

2023 Volume 12, Issue 1, Page(s) 240

Abstract: The deep ocean, characterized by its immense depths and absence of global positioning system (GPS) functionality, presents considerable challenges for search and rescue missions. Inspired by the geolocalization capabilities of migratory marine animals, ... ...

Abstract	The deep ocean, characterized by its immense depths and absence of global positioning system (GPS) functionality, presents considerable challenges for search and rescue missions. Inspired by the geolocalization capabilities of migratory marine animals, Bai et al. present a novel method for underwater geolocalization using the polarization patterns of light in the underwater environment. Emulating a sextant using these underwater polarization patterns, the study determines geolocation in underwater settings. Despite prior skepticism, even in low-visibility waters, these patterns, learned through a deep neural network, provide geolocation accuracies of 55 km at 8 m and 255 km at 50 m. This pioneering approach offers implications for search and rescue and hints at navigation mechanisms in marine animals.
Language	English
Publishing date	2023-09-20
Publishing country	England
Document type	Journal Article
ZDB-ID	2662628-7
ISSN	2047-7538 ; 2047-7538
ISSN (online)	2047-7538
ISSN	2047-7538
DOI	10.1038/s41377-023-01279-z
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Single-Shot Reconfigurable Femtosecond Imaging of Ultrafast Optical Dynamics.

Wang, Peng / Wang, Lihong V

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

2023 Volume 10, Issue 13, Page(s) e2207222

Abstract: Understanding ultrafast dynamics in the femtosecond timescale plays a pivotal role in fundamental research and technology innovation. Spatiotemporal observation of those events in real-time requires imaging speeds greater than ... ...

Abstract	Understanding ultrafast dynamics in the femtosecond timescale plays a pivotal role in fundamental research and technology innovation. Spatiotemporal observation of those events in real-time requires imaging speeds greater than 10
Language	English
Publishing date	2023-03-04
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2808093-2
ISSN	2198-3844 ; 2198-3844
ISSN (online)	2198-3844
ISSN	2198-3844
DOI	10.1002/advs.202207222
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Article ; Online: Single-shot photoacoustic imaging with single-element transducer through a spatiotemporal encoder.

Zhao, Yanyu / Wang, Lihong V

Journal of biomedical optics

2023 Volume 28, Issue 4, Page(s) 46004

Abstract: Significance: Current photoacoustic (PA) imaging modalities typically require either serial detection with a single-element transducer or parallel detections with an ultrasonic array, indicating a dilemma between system cost and imaging throughput. PA ... ...

Abstract	Significance: Current photoacoustic (PA) imaging modalities typically require either serial detection with a single-element transducer or parallel detections with an ultrasonic array, indicating a dilemma between system cost and imaging throughput. PA topography through ergodic relay (PATER) was recently developed to address this bottleneck. However, PATER requires object-specific calibration due to varied boundary condition and must be recalibrated through pointwise scanning for each object before measurements, which is time-consuming and severely limits practical application. Aim: We aim to develop a new single-shot PA imaging technique that only requires a one-time calibration for imaging different objects using a single-element transducer. Approach: We develop an imaging method, PA imaging through a spatiotemporal encoder (PAISE), to address the above issue. The spatial information is effectively coded into unique temporal features by the spatiotemporal encoder, which allows for compressive image reconstruction. An ultrasonic waveguide is proposed as a critical element to guide the PA waves from the object into the prism, which effectively accounts for the varied boundary condition of different objects. We further add irregular-shaped edges on the prism to introduce randomized internal reflections and further facilitate the scrambling of acoustic waves. Results: The proposed technique is validated through comprehensive numerical simulations and experiments, and it is demonstrated that PAISE can successfully overcome the changed boundary condition and can image different samples given a single calibration. Conclusions: The proposed PAISE technique is capable of single-shot widefield PA imaging with a single-element transducer and does not require sample-specific calibration, which successfully overcomes the major limitation of previous PATER technology.
MeSH term(s)	Photoacoustic Techniques/methods ; Diagnostic Imaging ; Image Processing, Computer-Assisted/methods ; Spectrum Analysis ; Transducers ; Phantoms, Imaging
Language	English
Publishing date	2023-04-13
Publishing country	United States
Document type	Journal Article ; Research Support, N.I.H., Extramural
ZDB-ID	1309154-2
ISSN	1560-2281 ; 1083-3668
ISSN (online)	1560-2281
ISSN	1083-3668
DOI	10.1117/1.JBO.28.4.046004
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Article ; Online: The emerging role of photoacoustic imaging in clinical oncology.

Lin, Li / Wang, Lihong V

Nature reviews. Clinical oncology

2022 Volume 19, Issue 6, Page(s) 365–384

Abstract: Clinical oncology can benefit substantially from imaging technologies that reveal physiological characteristics with multiscale observations. Complementing conventional imaging modalities, photoacoustic imaging (PAI) offers rapid imaging (for example, ... ...

Abstract	Clinical oncology can benefit substantially from imaging technologies that reveal physiological characteristics with multiscale observations. Complementing conventional imaging modalities, photoacoustic imaging (PAI) offers rapid imaging (for example, cross-sectional imaging in real time or whole-breast scanning in 10-15 s), scalably high levels of spatial resolution, safe operation and adaptable configurations. Most importantly, this novel imaging modality provides informative optical contrast that reveals details on anatomical, functional, molecular and histological features. In this Review, we describe the current state of development of PAI and the emerging roles of this technology in cancer screening, diagnosis and therapy. We comment on the performance of cutting-edge photoacoustic platforms, and discuss their clinical applications and utility in various clinical studies. Notably, the clinical translation of PAI is accelerating in the areas of macroscopic and mesoscopic imaging for patients with breast or skin cancers, as well as in microscopic imaging for histopathology. We also highlight the potential of future developments in technological capabilities and their clinical implications, which we anticipate will lead to PAI becoming a desirable and widely used imaging modality in oncological research and practice.
MeSH term(s)	Diagnostic Imaging ; Early Detection of Cancer ; Humans ; Medical Oncology ; Photoacoustic Techniques/methods
Language	English
Publishing date	2022-03-23
Publishing country	England
Document type	Journal Article ; Review
ZDB-ID	2491410-1
ISSN	1759-4782 ; 1759-4774
ISSN (online)	1759-4782
ISSN	1759-4774
DOI	10.1038/s41571-022-00615-3
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Zs.A 6029: Show issues			Location: Je nach Verfügbarkeit (siehe Angabe bei Bestand) bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular ab Jg. 2022: Lesesaal (EG)
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Article: Data-driven system matrix manipulation enabling fast functional imaging and intra-image nonrigid motion correction in tomography.

Hu, Peng / Tong, Xin / Lin, Li / Wang, Lihong V

bioRxiv : the preprint server for biology

2024

Abstract: Tomographic imaging modalities are described by large system matrices. Sparse sampling and tissue motion degrade system matrix and image quality. Various existing techniques improve the image quality without correcting the system matrices. Here, we ... ...

Abstract	Tomographic imaging modalities are described by large system matrices. Sparse sampling and tissue motion degrade system matrix and image quality. Various existing techniques improve the image quality without correcting the system matrices. Here, we compress the system matrices to improve computational efficiency (e.g., 42 times) using singular value decomposition and fast Fourier transform. Enabled by the efficiency, we propose (1) fast sparsely sampling functional imaging by incorporating a densely sampled prior image into the system matrix, which maintains the critical linearity while mitigating artifacts and (2) intra-image nonrigid motion correction by incorporating the motion as subdomain translations into the system matrix and reconstructing the translations together with the image iteratively. We demonstrate the methods in 3D photoacoustic computed tomography with significantly improved image qualities and clarify their applicability to X-ray CT and MRI or other types of imperfections due to the similarities in system matrices.
Language	English
Publishing date	2024-01-08
Publishing country	United States
Document type	Preprint
DOI	10.1101/2024.01.07.574504
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Article ; Online: Location-Dependent Spatiotemporal Antialiasing in Photoacoustic Computed Tomography.

Hu, Peng / Li, Lei / Wang, Lihong V

IEEE transactions on medical imaging

2023 Volume 42, Issue 4, Page(s) 1210–1224

Abstract: Photoacoustic computed tomography (PACT) images optical absorption contrast by detecting ultrasonic waves induced by optical energy deposition in materials such as biological tissues. An ultrasonic transducer array or its scanning equivalent is used to ... ...

Abstract	Photoacoustic computed tomography (PACT) images optical absorption contrast by detecting ultrasonic waves induced by optical energy deposition in materials such as biological tissues. An ultrasonic transducer array or its scanning equivalent is used to detect ultrasonic waves. The spatial distribution of the transducer elements must satisfy the spatial Nyquist criterion; otherwise, spatial aliasing occurs and causes artifacts in reconstructed images. The spatial Nyquist criterion poses different requirements on the transducer elements' distributions for different locations in the image domain, which has not been studied previously. In this research, we elaborate on the location dependency through spatiotemporal analysis and propose a location-dependent spatiotemporal antialiasing method. By applying this method to PACT in full-ring array geometry, we effectively mitigate aliasing artifacts with minimal effects on image resolution in both numerical simulations and in vivo experiments.
MeSH term(s)	Artifacts ; Spatio-Temporal Analysis ; Tomography, X-Ray Computed/instrumentation ; Tomography, X-Ray Computed/methods ; Tomography, X-Ray Computed/standards ; Breast/diagnostic imaging ; Humans ; Image Processing, Computer-Assisted ; Algorithms ; Photoacoustic Techniques/methods ; Photoacoustic Techniques/standards ; Computer Simulation ; Phantoms, Imaging ; Female ; Reproducibility of Results
Language	English
Publishing date	2023-04-03
Publishing country	United States
Document type	Journal Article ; Research Support, N.I.H., Extramural
ZDB-ID	622531-7
ISSN	1558-254X ; 0278-0062
ISSN (online)	1558-254X
ISSN	0278-0062
DOI	10.1109/TMI.2022.3225565
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Article ; Online: Recent advances in photoacoustic tomography.

Li, Lei / Wang, Lihong V

BME frontiers

2021 Volume 2021

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 ... ...

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.
Language	English
Publishing date	2021-05-28
Publishing country	United States
Document type	Journal Article
ISSN	2765-8031
ISSN (online)	2765-8031
DOI	10.34133/2021/9823268
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Article ; Online: Focusing light into scattering media with ultrasound-induced field perturbation.

Cheng, Zhongtao / Wang, Lihong V

Light, science & applications

2021 Volume 10, Issue 1, Page(s) 159

Abstract: Focusing light into scattering media, although challenging, is highly desirable in many realms. With the invention of time-reversed ultrasonically encoded (TRUE) optical focusing, acousto-optic modulation was demonstrated as a promising guidestar ... ...

Abstract	Focusing light into scattering media, although challenging, is highly desirable in many realms. With the invention of time-reversed ultrasonically encoded (TRUE) optical focusing, acousto-optic modulation was demonstrated as a promising guidestar mechanism for achieving noninvasive and addressable optical focusing into scattering media. Here, we report a new ultrasound-assisted technique, ultrasound-induced field perturbation optical focusing, abbreviated as UFP. Unlike in conventional TRUE optical focusing, where only the weak frequency-shifted first-order diffracted photons due to acousto-optic modulation are useful, here UFP leverages the brighter zeroth-order photons diffracted by an ultrasonic guidestar as information carriers to guide optical focusing. We find that the zeroth-order diffracted photons, although not frequency-shifted, do have a field perturbation caused by the existence of the ultrasonic guidestar. By detecting and time-reversing the differential field of the frequency-unshifted photons when the ultrasound is alternately ON and OFF, we can focus light to the position where the field perturbation occurs inside the scattering medium. We demonstrate here that UFP optical focusing has superior performance to conventional TRUE optical focusing, which benefits from the more intense zeroth-order photons. We further show that UFP optical focusing can be easily and flexibly developed into double-shot realization or even single-shot realization, which is desirable for high-speed wavefront shaping. This new method upsets conventional thinking on the utility of an ultrasonic guidestar and broadens the horizon of light control in scattering media. We hope that it provides a more efficient and flexible mechanism for implementing ultrasound-guided wavefront shaping.
Language	English
Publishing date	2021-08-02
Publishing country	England
Document type	Journal Article
ZDB-ID	2662628-7
ISSN	2047-7538 ; 2047-7538
ISSN (online)	2047-7538
ISSN	2047-7538
DOI	10.1038/s41377-021-00605-7
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Article: Photoacoustic computed tomography for functional human brain imaging [Invited].

Na, Shuai / Wang, Lihong V

Biomedical optics express

2021 Volume 12, Issue 7, Page(s) 4056–4083

Abstract: The successes of magnetic resonance imaging and modern optical imaging of human brain function have stimulated the development of complementary modalities that offer molecular specificity, fine spatiotemporal resolution, and sufficient penetration ... ...

Abstract	The successes of magnetic resonance imaging and modern optical imaging of human brain function have stimulated the development of complementary modalities that offer molecular specificity, fine spatiotemporal resolution, and sufficient penetration simultaneously. By virtue of its rich optical contrast, acoustic resolution, and imaging depth far beyond the optical transport mean free path (∼1 mm in biological tissues), photoacoustic computed tomography (PACT) offers a promising complementary modality. In this article, PACT for functional human brain imaging is reviewed in its hardware, reconstruction algorithms,
Language	English
Publishing date	2021-06-15
Publishing country	United States
Document type	Journal Article ; Review
ZDB-ID	2572216-5
ISSN	2156-7085
ISSN	2156-7085
DOI	10.1364/BOE.423707
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Article: Photoacoustic Imaging.

Lin, Li / Wang, Lihong V

Advances in experimental medicine and biology

2021 Volume 3233, Page(s) 147–175

Abstract: Photoacoustic imaging (PAI) is an emerging imaging modality that shows great potential for preclinical research and clinical practice. As a hybrid technique, PAI uniquely combines the advantages of optical excitation and of acoustic detection. Optical ... ...

Abstract	Photoacoustic imaging (PAI) is an emerging imaging modality that shows great potential for preclinical research and clinical practice. As a hybrid technique, PAI uniquely combines the advantages of optical excitation and of acoustic detection. Optical excitation provides a rich contrast mechanism from either endogenous or exogenous chromophores, allowing PAI to perform biochemical, functional, and molecular imaging. Acoustic detection benefits from the low scattering of ultrasound in biological tissue, enabling PAI to generate high-resolution images in both the optical ballistic and diffusive regimes. Accordingly, this hybrid imaging modality features high sensitivity to optical absorption and wide scalability of spatial resolution with the desired imaging depth. Over the past two decades, the photoacoustic technique has led to a variety of exciting discoveries and applications from laboratory research to clinical patient care. In biological research, PAI has become an irreplaceable tool, providing functional optical contrast with high spatiotemporal resolution. Translational PAI also attracted growing interest in clinical applications including tumor margin examination, internal organ imaging, breast cancer screening, and sentinel lymph node mapping, among others.
MeSH term(s)	Breast Neoplasms ; Diagnostic Tests, Routine ; Early Detection of Cancer ; Humans ; Molecular Imaging ; Photoacoustic Techniques
Language	English
Publishing date	2021-05-02
Publishing country	United States
Document type	Journal Article
ISSN	2214-8019 ; 0065-2598
ISSN (online)	2214-8019
ISSN	0065-2598
DOI	10.1007/978-981-15-7627-0_8
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