15 results on '"Benedict Mc Larney"'
Search Results
2. A Review of Recent and Emerging Approaches for the Clinical Application of Cerenkov Luminescence Imaging
- Author
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Benedict Mc Larney, Magdalena Skubal, and Jan Grimm
- Subjects
cherenkov ,cerenkov ,preclinical ,clinical ,review ,image-guided ,Physics ,QC1-999 - Abstract
Cerenkov luminescence is a blue-weighted emission of light produced by a vast array of clinically approved radioisotopes and LINAC accelerators. When β particles (emitted during the decay of radioisotopes) are present in a medium such as water or tissue, they are able to travel faster than the speed of light in that medium and in doing so polarize the molecules around them. Once the particle has left the local area, the polarized molecules relax and return to their baseline state releasing the additional energy as light (luminescence). This blue glow has commonly been used to determine the output of nuclear power plant cores and, in recent years, has found traction in the preclinical and clinical imaging field. This brief review will discuss the technology which has enabled the emergence of the biomedical Cerenkov imaging field, recent pre-clinical studies with potential clinical translation of Cerenkov luminescence imaging and the current clinical implementations of the method. Finally, an outlook is given as to the direction in which the field is heading.
- Published
- 2021
- Full Text
- View/download PDF
3. Monitoring of Stimulus Evoked Murine Somatosensory Cortex Hemodynamic Activity With Volumetric Multi-Spectral Optoacoustic Tomography
- Author
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Benedict Mc Larney, Magdalena Anastasia Hutter, Oleksiy Degtyaruk, Xosé Luís Deán-Ben, and Daniel Razansky
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optoacoustics ,hemodynamics ,somatosensory ,cortex ,initial-dip ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
Sensory stimulation is an attractive paradigm for studying brain activity using various optical-, ultrasound- and MRI-based functional neuroimaging methods. Optoacoustics has been recently suggested as a powerful new tool for scalable mapping of multiple hemodynamic parameters with rich contrast and previously unachievable spatio-temporal resolution. Yet, its utility for studying the processing of peripheral inputs at the whole brain level has so far not been quantified. We employed volumetric multi-spectral optoacoustic tomography (vMSOT) to non-invasively monitor the HbO, HbR, and HbT dynamics across the mouse somatosensory cortex evoked by electrical paw stimuli. We show that elevated contralateral activation is preserved in the HbO map (invisible to MRI) under isoflurane anesthesia. Brain activation is shown to be predominantly confined to the somatosensory cortex, with strongest activation in the hindpaw region of the contralateral sensorimotor cortex. Furthermore, vMSOT detected the presence of an initial dip in the contralateral hindpaw region in the delta HbO channel. Sensorimotor cortical activity was identified over all other regions in HbT and HbO but not in HbR. Pearson’s correlation mapping enabled localizing the response to the sensorimotor cortex further highlighting the ability of vMSOT to bridge over imaging performance deficiencies of other functional neuroimaging modalities.
- Published
- 2020
- Full Text
- View/download PDF
4. Isolated Murine Brain Model for Large-Scale Optoacoustic Calcium Imaging
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Sven Gottschalk, Oleksiy Degtyaruk, Benedict Mc Larney, Johannes Rebling, Xosé Luis Deán-Ben, Shy Shoham, and Daniel Razansky
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isolated brain ,calcium dynamics ,optoacoustic neuroimaging ,functional neuroimaging ,GCaMP6f ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
Real-time visualization of large-scale neural dynamics in whole mammalian brains is hindered with existing neuroimaging methods having limited capacity when it comes to imaging large tissue volumes at high speeds. Optoacoustic imaging has been shown to be capable of real-time three-dimensional imaging of multiple cerebral hemodynamic parameters in rodents. However, optoacoustic imaging of calcium activity deep within the mammalian brain is hampered by strong blood absorption in the visible light spectrum as well as a lack of activity labels excitable in the near-infrared window. We have developed and validated an isolated whole mouse brain preparation labeled with genetically encoded calcium indicator GCaMP6f, which can closely resemble in vivo conditions. An optoacoustic imaging system coupled to a superfusion system was further designed and used for rapid volumetric monitoring of stimulus-evoked calcium dynamics in the brain. These new imaging setup and isolated preparation’s protocols and characteristics are described here in detail. Our new technique captures calcium fluxes as true three-dimensional information across the entire brain with temporal resolution of 10 ms and spatial resolution of 150 μm, thus enabling large-scale neural recording at penetration depths and spatio-temporal resolution scales not covered with any existing neuroimaging techniques.
- Published
- 2019
- Full Text
- View/download PDF
5. Optoacoustic Calcium Imaging of Deep Brain Activity in an Intracardially Perfused Mouse Brain Model
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Oleksiy Degtyaruk, Benedict Mc Larney, Xosé Luís Deán-Ben, Shy Shoham, and Daniel Razansky
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optoacoustic neuroimaging ,GCaMP6f ,calcium dynamics ,functional neuroimaging ,Applied optics. Photonics ,TA1501-1820 - Abstract
One main limitation of established neuroimaging methods is the inability to directly visualize large-scale neural dynamics in whole mammalian brains at subsecond speeds. Optoacoustic imaging has advanced in recent years to provide unique advantages for real-time deep-tissue observations, which have been exploited for three-dimensional imaging of both cerebral hemodynamic parameters and direct calcium activity in rodents. Due to a lack of suitable calcium indicators excitable in the near-infrared window, optoacoustic imaging of neuronal activity at deep-seated areas of the mammalian brain has been impeded by the strong absorption of blood in the visible range of the light spectrum. To overcome this, we have developed and validated an intracardially perfused mouse brain preparation labelled with genetically encoded calcium indicator GCaMP6f that closely resembles in vivo conditions. By overcoming the limitations of hemoglobin-based light absorption, this new technique was used to observe stimulus-evoked calcium dynamics in the brain at penetration depths and spatio-temporal resolution scales not attainable with existing neuroimaging techniques.
- Published
- 2019
- Full Text
- View/download PDF
6. Prospective testing of clinical Cerenkov luminescence imaging against standard-of-care nuclear imaging for tumour location
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Edwin C. Pratt, Magdalena Skubal, Benedict Mc Larney, Pamela Causa-Andrieu, Sudeep Das, Peter Sawan, Abdallah Araji, Christopher Riedl, Kunal Vyas, David Tuch, and Jan Grimm
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Luminescence ,Fluorodeoxyglucose F18 ,Neoplasms ,Positron Emission Tomography Computed Tomography ,Positron-Emission Tomography ,Luminescent Measurements ,Biomedical Engineering ,Humans ,Medicine (miscellaneous) ,Bioengineering ,Prospective Studies ,Computer Science Applications ,Biotechnology - Abstract
In oncology, the feasibility of Cerenkov luminescence imaging (CLI) has been assessed by imaging superficial lymph nodes in a few patients undergoing diagnostic
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- 2022
7. PSMA-bearing extracellular vesicles secreted from prostate cancer convert the microenvironment to a tumor-supporting, pro-angiogenic state
- Author
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Camila Maria Longo Machado, Magdalena Skubal, Katja Haedicke, Fabio Pittella Silva, Evan Paul Stater, Thais Larissa Araujo de Oliveira Silva, Erico Tosoni Costa, Cibele Masotti, Andreia Hanada Otake, Luciana Nogueira Sousa Andrade, Mara de Souza Junqueira, Hsiao-Ting Hsu, Sudeep Das, Benedict Mc Larney, Edwin Charles Pratt, Yevgeniy Romin, Ning Fan, Katia Manova-Todorova, Martin Pomper, Jan Grimm, and Universidade de Brasília, Faculdade de Ciências da Saúde, Laboratório de Patologia Molecular do Câncer
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urologic and male genital diseases ,Próstata - câncer - Abstract
Extracellular vesicles (EV) are comprised of vesicles budding from cell membranes and smaller intracellular vesicles shed by cells. EV play a role in remodeling the tumor microenvironment (TME) and support tumor progression. Prostate-specific membrane antigen (PSMA) is a transmembrane glycoprotein with a carboxypeptidase function, frequently associated with poor clinical prognosis in prostate cancer (PCa). We previously identified an oncogenic PSMA signaling function in prostate cancer. Others demonstrated that EV isolated from the plasma of patients with high-grade PCa carry PSMA, but so far no pathophysiological effect has been associated with PSMA-bearing EV. Here we demonstrate that EV from PCa cells are able to transfer PSMA and its functionality to cells in the TME. The consequence of that EV-mediated PSMA transfer is an acute to long-term increased secretion of vascular endothelial growth factor-A (VEGF-A), angiogenin, pro-angiogenic and pro-lymphangiogenic mediators and increased 4E binding protein 1 (4EBP-1) phosphorylation in tumors. We compare EV from PCa cells with or without PSMA expression to address the role of PSMA-bearing EV in promoting pro-tumoral changes in the TME using classical molecular biology and novel molecular imaging approaches.
- Published
- 2022
8. Shortwave infrared detection of medical radioisotope Cerenkov luminescence
- Author
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Jan Grimm, Benedict Mc Larney, Qize Zhang, Edwin Pratt, Magdalena Skubal, Elizabeth Isaac, Hsiao-Ting Hsu, and Anuja Ogirala
- Abstract
Cerenkov luminescence (CL) is produced by medical radioisotopes when charged (commonly beta (β+/-)) particles travel faster than light in a dielectric medium (tissue). This blue-weighted luminescence is both continuous and proportional to the reciprocal wavelength. CL imaging (CLI) promises an economical alternative to PET but is limited by the optical properties of tissue and special setup requirements. CL has been detected in the shortwave infrared (SWIR) spectrum (900 – 1700 nm) from linear accelerators operating in the MeV range but so far not from medical radioisotopes. This work is the first to show that the order of magnitude weaker SWIR CL from medical radioisotopes predicted by the Frank-Tamm equation can also be detected, using commercially available SWIR components. SWIR CL was detected from five clincial radioisotopes: 90Y, 68Ga, 18F, 89Zr, 131I and from 32P, used in biomedical research. The advantage of radioisotope SWIR CLI over conventional CLI is shown in terms of significantly increased light penetration and reduced scattering at tissue depth, in line with the known advantages of SWIR imaging. We report the radioisotope SWIR spectrum, the current detection sensitivity limit (0.23 µCi/µl of 68Ga) and determine the feasibility of SWIR CLI with ex vivo and in vivo preclinical examples. Further improvements in SWIR optics and technology are required to enable widespread adoption.
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- 2022
9. Rapid volumetric optoacoustic imaging of neural dynamics across the mouse brain
- Author
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Magdalena Anastasia Hutter, Daniel Razansky, Johannes Rebling, Sven Gottschalk, Benedict Mc Larney, Xosé Luís Deán-Ben, Oleksiy Degtyaruk, Shy Shoham, University of Zurich, and Razansky, Daniel
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0301 basic medicine ,Time Factors ,Biomedical Engineering ,10050 Institute of Pharmacology and Toxicology ,2204 Biomedical Engineering ,Medicine (miscellaneous) ,610 Medicine & health ,Bioengineering ,Somatosensory system ,Fluorescence ,Photoacoustic Techniques ,170 Ethics ,03 medical and health sciences ,Imaging, Three-Dimensional ,0302 clinical medicine ,Optical imaging ,Neuroimaging ,In vivo ,Evoked Potentials, Somatosensory ,Microscopy ,1706 Computer Science Applications ,Animals ,Premovement neuronal activity ,10237 Institute of Biomedical Engineering ,1502 Bioengineering ,Chemistry ,Brain ,2701 Medicine (miscellaneous) ,Electric Stimulation ,Computer Science Applications ,Mice, Inbred C57BL ,030104 developmental biology ,1305 Biotechnology ,Calcium ,Female ,Neuroscience ,030217 neurology & neurosurgery ,Ex vivo ,Optoacoustic imaging ,Biotechnology - Abstract
Efforts to scale neuroimaging towards the direct visualization of mammalian brain-wide neuronal activity have faced major challenges. Although high-resolution optical imaging of the whole brain in small animals has been achieved ex vivo, the real-time and direct monitoring of large-scale neuronal activity remains difficult, owing to the performance gap between localized, largely invasive, optical microscopy of rapid, cellular-resolved neuronal activity and whole-brain macroscopy of slow haemodynamics and metabolism. Here, we demonstrate both ex vivo and non-invasive in vivo functional optoacoustic (OA) neuroimaging of mice expressing the genetically encoded calcium indicator GCaMP6f. The approach offers rapid, high-resolution three-dimensional snapshots of whole-brain neuronal activity maps using single OA excitations, and of stimulus-evoked slow haemodynamics and fast calcium activity in the presence of strong haemoglobin background absorption. By providing direct neuroimaging at depths and spatiotemporal resolutions superior to optical fluorescence imaging, functional OA neuroimaging bridges the gap between functional microscopy and whole-brain macroscopy.
- Published
- 2019
10. Publisher Correction: Rapid volumetric optoacoustic imaging of neural dynamics across the mouse brain
- Author
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Benedict Mc Larney, Oleksiy Degtyaruk, Sven Gottschalk, Magdalena Anastasia Hutter, Shy Shoham, Daniel Razansky, Johannes Rebling, Xosé Luís Deán-Ben, University of Zurich, Shoham, Shy, and Razansky, Daniel
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1502 Bioengineering ,business.industry ,Dynamics (mechanics) ,Biomedical Engineering ,Medicine (miscellaneous) ,2204 Biomedical Engineering ,Bioengineering ,610 Medicine & health ,2701 Medicine (miscellaneous) ,Computer Science Applications ,170 Ethics ,1305 Biotechnology ,1706 Computer Science Applications ,Medicine ,10237 Institute of Biomedical Engineering ,business ,Optoacoustic imaging ,Biotechnology ,Biomedical engineering - Published
- 2020
11. High-speed large-field Multifocal illumination fluorescence microscopy
- Author
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Xosé Luís Deán-Ben, Benedict Mc Larney, Daniel Razansky, Quanyu Zhou, Zhenyue Chen, Johannes Rebling, Sven Gottschalk, and University of Zurich
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Fluorescence-lifetime imaging microscopy ,Materials science ,Field (physics) ,Multifocal illumination ,10050 Institute of Pharmacology and Toxicology ,610 Medicine & health ,Fast scanning microscopy ,01 natural sciences ,Fluorescence imaging ,170 Ethics ,010309 optics ,03 medical and health sciences ,Optics ,0103 physical sciences ,Fluorescence microscope ,10237 Institute of Biomedical Engineering ,Diffraction grating ,030304 developmental biology ,0303 health sciences ,business.industry ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,ddc ,Electronic, Optical and Magnetic Materials ,Diffraction gratings ,business ,Diffraction Gratings ,Fast Scanning Microscopy ,Fluorescence Imaging ,Multifocal Illumination - Abstract
Scanning optical microscopy techniques are commonly restricted to a sub‐millimeter field‐of‐view (FOV) or otherwise employ slow mechanical translation, limiting their applicability for imaging fast biological dynamics occurring over large areas. A rapid scanning large‐field multifocal illumination (LMI) fluorescence microscopy technique is devised based on a beam‐splitting grating and an acousto‐optic deflector synchronized with a high‐speed camera to attain real‐time fluorescence microscopy over a centimeter‐scale FOV. Owing to its large depth of focus, the approach allows noninvasive visualization of perfusion across the entire mouse cerebral cortex, not achievable with conventional wide‐field fluorescence microscopy methods. The new concept can readily be incorporated into conventional wide‐field microscopes to mitigate image blur due to tissue scattering and attain optimal trade‐off between spatial resolution and FOV. It further establishes a bridge between conventional wide‐field macroscopy and laser scanning confocal microscopy, thus it is anticipated to find broad applicability in functional neuroimaging, in vivo cell tracking, and other applications looking at large‐scale fluorescent‐based biodynamics., Laser & Photonics Reviews, 14 (2), ISSN:1863-8880, ISSN:1863-8899
- Published
- 2020
12. Optoacoustic calcium imaging of deep brain activity in an intracardially perfused mouse brain model
- Author
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Daniel Razansky, Oleksiy Degtyaruk, Benedict Mc Larney, Shy Shoham, Xosé Luís Deán-Ben, University of Zurich, and Razansky, Daniel
- Subjects
lcsh:Applied optics. Photonics ,Brain activity and meditation ,chemistry.chemical_element ,10050 Institute of Pharmacology and Toxicology ,610 Medicine & health ,functional neuroimaging ,Calcium ,3107 Atomic and Molecular Physics, and Optics ,170 Ethics ,03 medical and health sciences ,0302 clinical medicine ,Calcium imaging ,Calcium Dynamics ,Functional Neuroimaging ,Gcamp6f ,Optoacoustic Neuroimaging ,Neuroimaging ,GCaMP6f ,Calcium dynamics ,In vivo ,Functional neuroimaging ,Premovement neuronal activity ,2741 Radiology, Nuclear Medicine and Imaging ,Radiology, Nuclear Medicine and imaging ,10237 Institute of Biomedical Engineering ,Instrumentation ,030304 developmental biology ,0303 health sciences ,3105 Instrumentation ,lcsh:TA1501-1820 ,calcium dynamics ,Atomic and Molecular Physics, and Optics ,ddc ,chemistry ,optoacoustic neuroimaging ,Biophysics ,030217 neurology & neurosurgery - Abstract
One main limitation of established neuroimaging methods is the inability to directly visualize large-scale neural dynamics in whole mammalian brains at subsecond speeds. Optoacoustic imaging has advanced in recent years to provide unique advantages for real-time deep-tissue observations, which have been exploited for three-dimensional imaging of both cerebral hemodynamic parameters and direct calcium activity in rodents. Due to a lack of suitable calcium indicators excitable in the near-infrared window, optoacoustic imaging of neuronal activity at deep-seated areas of the mammalian brain has been impeded by the strong absorption of blood in the visible range of the light spectrum. To overcome this, we have developed and validated an intracardially perfused mouse brain preparation labelled with genetically encoded calcium indicator GCaMP6f that closely resembles in vivo conditions. By overcoming the limitations of hemoglobin-based light absorption, this new technique was used to observe stimulus-evoked calcium dynamics in the brain at penetration depths and spatio-temporal resolution scales not attainable with existing neuroimaging techniques., Photonics, 6 (2)
- Published
- 2019
13. A genetically encoded near-infrared fluorescent calcium ion indicator
- Author
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Mikhail Drobizhev, Sven Gottschalk, Wei Zhang, Jiahui Wu, Sohum Mehta, Rosana S. Molina, Thomas E. Hughes, Yingche Chen, Daniel Razansky, Jin Zhang, Robert E. Campbell, Mitchell H. Murdock, Edward S. Boyden, Shy Shoham, Yong Qian, Kiryl D. Piatkevich, Eric R. Schreiter, Ahmed S. Abdelfattah, Benedict Mc Larney, University of Zurich, and Campbell, Robert E
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Male ,1303 Biochemistry ,10050 Institute of Pharmacology and Toxicology ,Brain tissue ,Hippocampus ,Biochemistry ,170 Ethics ,1307 Cell Biology ,Mice ,Microscopy ,Fluorescence Resonance Energy Transfer ,Neurons ,0303 health sciences ,Microscopy, Confocal ,Spectroscopy, Near-Infrared ,Fluorescence ,1305 Biotechnology ,Female ,Biotechnology ,Confocal ,Genetic Vectors ,chemistry.chemical_element ,610 Medicine & health ,Calcium ,Optogenetics ,Article ,03 medical and health sciences ,Protein Domains ,Escherichia coli ,1312 Molecular Biology ,Animals ,Humans ,10237 Institute of Biomedical Engineering ,Molecular Biology ,Fluorescent Dyes ,030304 developmental biology ,Ions ,Biliverdine ,Near-infrared spectroscopy ,technology, industry, and agriculture ,DNA ,Cell Biology ,Mice, Inbred C57BL ,Förster resonance energy transfer ,Microscopy, Fluorescence ,chemistry ,Biophysics ,HeLa Cells - Abstract
We report an intensiometric, near-infrared fluorescent, genetically encoded calcium ion (Ca2+) indicator (GECI) with excitation and emission maxima at 678 and 704 nm, respectively. This GECI, designated NIR-GECO1, enables imaging of Ca2+ transients in cultured mammalian cells and brain tissue with sensitivity comparable to that of currently available visible-wavelength GECIs. We demonstrate that NIR-GECO1 opens up new vistas for multicolor Ca2+ imaging in combination with other optogenetic indicators and actuators. NIR-GECO1, the first near-infrared genetically encoded calcium ion (Ca2+) indicator, enables improved Ca2+ imaging in conjunction with blue-light-activated optogenetic tools and multiplexed imaging in cell cultures and tissue slices.
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- 2019
14. Uniform light delivery in volumetric optoacoustic tomography
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Sven Gottschalk, Benedict Mc Larney, Daniel Razansky, Xosé Luís Deán-Ben, Zhenyue Chen, Johannes Rebling, University of Zurich, and Razansky, Daniel
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Optical fiber ,Materials science ,Image quality ,10050 Institute of Pharmacology and Toxicology ,General Physics and Astronomy ,610 Medicine & health ,1600 General Chemistry ,Field of view ,Iterative reconstruction ,01 natural sciences ,General Biochemistry, Genetics and Molecular Biology ,law.invention ,Photoacoustic Techniques ,170 Ethics ,010309 optics ,Mice ,Optics ,1300 General Biochemistry, Genetics and Molecular Biology ,law ,0103 physical sciences ,Animals ,10237 Institute of Biomedical Engineering ,General Materials Science ,Penetration depth ,3d-printing ,Fibers ,Illumination ,Imaging ,Optoacoustics ,Organs ,Tomography ,Optical Fibers ,Phantoms, Imaging ,Dynamic range ,business.industry ,010401 analytical chemistry ,General Engineering ,Brain ,General Chemistry ,2500 General Materials Science ,3100 General Physics and Astronomy ,0104 chemical sciences ,Printing, Three-Dimensional ,2200 General Engineering ,Female ,Ultrasonic sensor ,business - Abstract
Accurate image reconstruction in volumetric optoacoustic tomography implies the efficient generation and collection of ultrasound signals around the imaged object. Non-uniform delivery of the excitation light is a common problem in optoacoustic imaging often leading to a diminished field of view, limited dynamic range and penetration, as well as impaired quantification abilities. Presented here is an optimised illumination concept for volumetric tomography that utilizes additive manufacturing via 3D printing in combination with custom-made optical fiber illumination. The custom-designed sample chamber ensures convenient access to the imaged object along with accurate positioning of the sample and a matrix array ultrasound transducer used for collection of the volumetric image data. Raytracing is employed to optimize the positioning of the individual fibers in the chamber. Homogeneity of the generated light excitation field was confirmed in tissue-mimicking agar spheres. Applicability of the system to image entire mouse organs ex vivo has been showcased. The new approach showed a clear advantage over conventional, single-sided illumination strategies by eliminating the need to correct for illumination variances and resulting in enhancement of the effective field of view, greater penetration depth and significant improvements in the overall image quality. This article is protected by copyright.
- Published
- 2019
15. Neuroimaging: High‐Speed Large‐Field Multifocal Illumination Fluorescence Microscopy (Laser Photonics Rev. 14(2)/2020)
- Author
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Zhenyue Chen, Johannes Rebling, Daniel Razansky, Quanyu Zhou, Sven Gottschalk, Benedict Mc Larney, and Xosé Luís Deán-Ben
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Materials science ,Field (physics) ,business.industry ,Condensed Matter Physics ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Optics ,Neuroimaging ,law ,Fluorescence microscope ,Photonics ,business - Published
- 2020
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