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Hill O, Wollweber M, Biermann T, Ripken T, Lachmayer R. Imperfect refractive index matching in scanning laser optical tomography and a method for digital correction. JOURNAL OF BIOMEDICAL OPTICS 2024; 29:066004. [PMID: 38751827 PMCID: PMC11095122 DOI: 10.1117/1.jbo.29.6.066004] [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: 10/19/2023] [Revised: 04/19/2024] [Accepted: 04/22/2024] [Indexed: 05/18/2024]
Abstract
Significance Scanning laser optical tomography (SLOT) is a volumetric multi-modal imaging technique that is comparable to optical projection tomography and computer tomography. Image quality is crucially dependent on matching the refractive indexes (RIs) of the sample and surrounding medium, but RI matching often requires some effort and is never perfect. Aim Reducing the burden of RI matching between the immersion medium and sample in biomedical imaging is a challenging and interesting task. We aim at implementing a post processing strategy for correcting SLOT measurements that have errors caused by RI mismatch. Approach To better understand the problems with poorly matched Ris, simulated SLOT measurements with imperfect RI matching of the sample and medium are performed and presented here. A method to correct distorted measurements was developed and is presented and evaluated. This method is then applied to a sample containing fluorescent polystyrene beads and a sample made of olydimethylsiloxane with embedded fluorescent nanoparticles. Results From the simulations, it is evident that measurements with an RI mismatch larger than 0.02 and no correction yield considerably worse results compared to perfectly matched measurements. RI mismatches larger than 0.05 make it almost impossible to resolve finer details and structures. By contrast, the simulations imply that a measurement with an RI mismatch of up to 0.1 can still yield reasonable results if the presented correction method is applied. The experiments validate the simulated results for an RI mismatch of about 0.09. Conclusions The method significantly improves the SLOT image quality for samples with imperfectly matched Ris. Although the absolutely best imaging quality will be achieved with perfect RI matching, these results pave the way for imaging in SLOT with RI mismatches while maintaining high image quality.
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Affiliation(s)
- Ole Hill
- Leibniz University Hanover, Hannover, Germany
- Laser Zentrum Hannover e.V., Hannover, Germany
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Kamin H, Nolte L, Bleilevens A, Stickeler E, Heinemann D, Maurer J, Johannsmeier S, Ripken T. Imaging and quantification of the tumor microenvironment of triple negative breast cancer using TPEF and scanning laser optical tomography. BIOMEDICAL OPTICS EXPRESS 2023; 14:4579-4593. [PMID: 37791264 PMCID: PMC10545185 DOI: 10.1364/boe.494181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 06/20/2023] [Accepted: 07/16/2023] [Indexed: 10/05/2023]
Abstract
Triple-negative breast cancer is an aggressive subtype of breast cancer that has a poor five-year survival rate. The tumor's extracellular matrix is a major compartment of its microenvironment and influences the proliferation, migration and the formation of metastases. The study of such dependencies requires methods to analyze the tumor matrix in its native form. In this work, the limits of SHG-microscopy, namely limited penetration depth, sample size and specificity, are addressed by correlative three-dimensional imaging. We present the combination of scanning laser optical tomography (SLOT) and multiphoton microscopy, to depict the matrix collagen on different scales. Both methods can be used complementarily to generate full-volume views and allow for in-depth analysis. Additionally, we explore the use of SHG as a contrast mechanism for complex samples in SLOT. It was possible to depict the overall collagen structure and specific fibers using marker free imaging on different scales. An appropriate sample preparation enables the fixation of the structures while simultaneously conserving the fluorescence of antibody staining. We find that SHG is a suitable contrast mechanism to depict matrix collagen even in complex samples and using SLOT. The insights presented here shall further facilitate the study of the tumor extracellular matrix by correlative 3d imaging.
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Affiliation(s)
- Hannes Kamin
- Industrial and Biomedical Optics Department, Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany
| | - Lena Nolte
- Industrial and Biomedical Optics Department, Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany
| | - Andreas Bleilevens
- Clinic for Gynecology and Obstetrics, University Hospital Aachen, Pauwelstr. 30, 52074 Aachen, Germany
| | - Elmar Stickeler
- Clinic for Gynecology and Obstetrics, University Hospital Aachen, Pauwelstr. 30, 52074 Aachen, Germany
| | - Dag Heinemann
- Industrial and Biomedical Optics Department, Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany
- Department of Phytophotonics, Institute of Horticultural Production Systems, Leibniz University Hannover, Herrenhäuser Str. 2, 30419 Hannover, Germany
- Hannover Centre for Optical Technologies (HOT), Leibniz University Hannover, Nienburger Str. 17, 30167 Hannover, Germany
| | - Jochen Maurer
- Clinic for Gynecology and Obstetrics, University Hospital Aachen, Pauwelstr. 30, 52074 Aachen, Germany
| | - Sonja Johannsmeier
- Industrial and Biomedical Optics Department, Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany
- Lower Saxony Centre for Biomedical Engineering, Implant Research and Development, Stadtfelddamm 34, 30625 Hannover, Germany
| | - Tammo Ripken
- Industrial and Biomedical Optics Department, Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany
- Lower Saxony Centre for Biomedical Engineering, Implant Research and Development, Stadtfelddamm 34, 30625 Hannover, Germany
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Feng JR, Zhao ZR, Xiong ZL, Kang HS, Ding SJ, Ma L, Zhou L. Ultrabroad spectral response and excellent SERS performance of PbS-assisted Au/PbS/Au nanostars. NANOSCALE 2022; 14:17633-17640. [PMID: 36412494 DOI: 10.1039/d2nr04666k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Noble metal nanomaterials have many excellent optical properties due to localized surface plasmon resonance induced by external electric and magnetic fields. The plasmon-enhanced optical properties of nanomaterials can be controlled by changing their shapes or compositions. Here, we use a gentle approach to synthesize Au/PbS/Au nanostars with multiple tips and explore the surface-enhanced Raman scattering (SERS) activity, the second harmonic generation (SHG), and photocatalytic performance. The Au/PbS/Au nanostars have ultrabroad spectral responses and significantly enhanced local electric fields near the sharp tips. The size and tip length of the Au/PbS/Au nanostars can be adjusted by changing the amount of HAuCl4. The Au/PbS/Au nanostars exhibit largely enhanced SERS activity and photocatalytic degradation efficiency compared with the Au bipyramids and the Au BPs@PbS nanocrystals. In addition, the SHG of Au/PbS/Au nanostars is also significantly enhanced due to asymmetry and local field enhancement. This research shows potential in many applications ranging from photophysics to photochemistry.
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Affiliation(s)
- Jing-Ru Feng
- School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, P. R. China.
| | - Zhi-Rui Zhao
- School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, P. R. China.
| | - Zhong-Long Xiong
- School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, P. R. China.
| | - Hao-Sen Kang
- Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China.
| | - Si-Jing Ding
- School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, P. R. China.
| | - Liang Ma
- Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China.
| | - Li Zhou
- School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China.
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Bode K, Nolte L, Kamin H, Desens M, Ulmann A, Bergmann GA, Betker P, Reitmeier J, Ripken T, Stern M, Meyer H, Bicker G. Scanning laser optical tomography resolves developmental neurotoxic effects on pioneer neurons. Sci Rep 2020; 10:2641. [PMID: 32060340 PMCID: PMC7021824 DOI: 10.1038/s41598-020-59562-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 01/31/2020] [Indexed: 01/13/2023] Open
Abstract
Developmental neurotoxic compounds impair the developing human nervous system at lower doses than those affecting adults. Standardized test methods for assessing developmental neurotoxicity (DNT) require the use of high numbers of laboratory animals. Here, we use a novel assay that is based on the development of an intact insect embryo in serum-free culture. Neural pathways in the leg of embryonic locusts are established by a pair of afferent pioneer neurons, extending axons along a well-defined pathway to the central nervous system. After exposure to test chemicals, we analyze pioneer neuron shape with conventional fluorescence microscopy and compare it to 3D images, obtained by scanning laser optical tomography (SLOT) and processed by a segmentation algorithm. The segmented SLOT images resolve the 3D structure of the pioneers, recognize pathfinding defects and are thus advantageous for detecting DNT-positive compounds. The defects in axon elongation and pathfinding of pioneer axons caused by two DNT-positive reference compounds (methylmercury chloride; sodium(meta)arsenite) are compared to the biochemically measured general viability of the embryo. Using conventional fluorescence microscopy to establish concentration-response curves of axon elongation, we show that this assay identifies methylmercury chloride and the pro-apoptotic compound staurosporine as developmental neurotoxicants.
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Affiliation(s)
- Karsten Bode
- University of Veterinary Medicine Hannover, Institute of Physiology and Cell Biology, Bischofsholer Damm 15/102, 30173, Hannover, Germany
| | - Lena Nolte
- Laser Zentrum Hannover e.V., Industrial and Biomedical Optics Department, D-30419, Hannover, Germany
| | - Hannes Kamin
- Laser Zentrum Hannover e.V., Industrial and Biomedical Optics Department, D-30419, Hannover, Germany
| | - Michael Desens
- Laser Zentrum Hannover e.V., Industrial and Biomedical Optics Department, D-30419, Hannover, Germany
| | - Arthur Ulmann
- University of Veterinary Medicine Hannover, Institute of Physiology and Cell Biology, Bischofsholer Damm 15/102, 30173, Hannover, Germany
| | - Gregor A Bergmann
- University of Veterinary Medicine Hannover, Institute of Physiology and Cell Biology, Bischofsholer Damm 15/102, 30173, Hannover, Germany
| | - Philine Betker
- University of Veterinary Medicine Hannover, Institute of Physiology and Cell Biology, Bischofsholer Damm 15/102, 30173, Hannover, Germany
| | - Jennifer Reitmeier
- University of Veterinary Medicine Hannover, Institute of Physiology and Cell Biology, Bischofsholer Damm 15/102, 30173, Hannover, Germany
| | - Tammo Ripken
- Laser Zentrum Hannover e.V., Industrial and Biomedical Optics Department, D-30419, Hannover, Germany
| | - Michael Stern
- University of Veterinary Medicine Hannover, Institute of Physiology and Cell Biology, Bischofsholer Damm 15/102, 30173, Hannover, Germany
| | - Heiko Meyer
- Laser Zentrum Hannover e.V., Industrial and Biomedical Optics Department, D-30419, Hannover, Germany
| | - Gerd Bicker
- University of Veterinary Medicine Hannover, Institute of Physiology and Cell Biology, Bischofsholer Damm 15/102, 30173, Hannover, Germany.
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Kazarine A, Kolosova K, Gopal AA, Wang H, Tahara R, Rammal A, Kost K, Mongeau L, Li-Jessen NYK, Wiseman PW. Multimodal virtual histology of rabbit vocal folds by nonlinear microscopy and nano computed tomography. BIOMEDICAL OPTICS EXPRESS 2019; 10:1151-1164. [PMID: 30891336 PMCID: PMC6420294 DOI: 10.1364/boe.10.001151] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 01/29/2019] [Accepted: 01/31/2019] [Indexed: 05/31/2023]
Abstract
Human vocal folds (VFs) possess a unique anatomical structure and mechanical properties for human communication. However, VFs are prone to scarring as a consequence of overuse, injury, disease or surgery. Accumulation of scar tissue on VFs inhibits proper phonation and leads to partial or complete loss of voice, with significant consequences for the patient's quality of life. VF regeneration after scarring provides a significant challenge for tissue engineering therapies given the complexity of tissue microarchitecture. To establish an effective animal model for VF injury and scarring, new histological methods are required to visualize the wound repair process of the tissue in its three-dimensional native environment. In this work, we propose the use of a combination of nonlinear microscopy and nanotomography as contrast methods for virtual histology of rabbit VFs. We apply these methods to rabbit VF tissue to demonstrate their use as alternatives to conventional VF histology that may enable future clinical studies of this injury model.
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Affiliation(s)
- Alexei Kazarine
- Department of Chemistry, McGill University, 801 Sherbrooke St. West, Montreal, QC H3A 0B8, Canada
| | - Ksenia Kolosova
- Department of Physics, McGill University, 3600 University St., Montreal, QC, H3A 2T8, Canada
| | - Angelica A. Gopal
- Department of Chemistry, McGill University, 801 Sherbrooke St. West, Montreal, QC H3A 0B8, Canada
- Department of Physiology, McGill University, 3655 Promenade Sir William Osler, Montreal, H3G 1Y6, Canada
| | - Huijie Wang
- Department of Mechanical Engineering, McGill University, 817 Sherbrooke St. West, Montreal, QC H3A 0C3, Canada
- School of Communication Sciences and Disorders, McGill University, 2001 McGill College Ave., Montreal, QC H3A 1G1, Canada
| | - Rui Tahara
- Redpath Museum, McGill University, 859 Sherbrooke St. West, Montreal, QC H3A 0C4, Canada
| | - Almoaidbellah Rammal
- Department of Otolaryngology – Head and Neck Surgery, McGill University, 1001 Decarie Blvd., Montreal, QC, H4A 3J1, Canada
- Department of Otolaryngology – Head and Neck Surgery, King Abdul-Aziz University, Jeddah, Saudi Arabia
| | - Karen Kost
- Department of Otolaryngology – Head and Neck Surgery, McGill University, 1001 Decarie Blvd., Montreal, QC, H4A 3J1, Canada
| | - Luc Mongeau
- Department of Mechanical Engineering, McGill University, 817 Sherbrooke St. West, Montreal, QC H3A 0C3, Canada
| | - Nicole Y. K. Li-Jessen
- School of Communication Sciences and Disorders, McGill University, 2001 McGill College Ave., Montreal, QC H3A 1G1, Canada
- Department of Otolaryngology – Head and Neck Surgery, McGill University, 1001 Decarie Blvd., Montreal, QC, H4A 3J1, Canada
- Department of Biomedical Engineering, McGill University, 3775 University St., Montreal H3A 2B4, Canada
| | - Paul W. Wiseman
- Department of Chemistry, McGill University, 801 Sherbrooke St. West, Montreal, QC H3A 0B8, Canada
- Department of Physics, McGill University, 3600 University St., Montreal, QC, H3A 2T8, Canada
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