1
|
Chiu KS, Tanifuji M, Sun CW, Rajagopalan UM, Nakamichi Y. Temporal mirror-symmetry in functional signals recorded from rat barrel cortex with optical coherence tomography. Cereb Cortex 2022; 33:4904-4914. [PMID: 36227198 DOI: 10.1093/cercor/bhac388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 08/31/2022] [Accepted: 09/01/2022] [Indexed: 11/14/2022] Open
Abstract
Functional optical coherence tomography (fOCT) detects activity-dependent light scattering changes in micro-structures of neural tissue, drawing attention as in vivo volumetric functional imaging technique at a sub-columnar level. There are 2 plausible origins for the light scattering changes: (i) hemodynamic responses such as changes in blood volume and in density of blood cells and (ii) reorientation of dipoles in cellular membrane. However, it has not been clarified which is the major contributor to fOCT signals. Furthermore, previous studies showed both increase and decrease of reflectivity as fOCT signals, making interpretation more difficult. We proposed combination of fOCT with Fourier imaging and adaptive statistics to the rat barrel cortex. Active voxels revealed barrels elongating throughout layers with mini-columns in superficial layers consistent with physiological studies, suggesting that active voxels revealed by fOCT reflect spatial patterns of activated neurons. These voxels included voxels with negative changes in reflectivity and those with positive changes in reflectivity. However, they were temporally mirror-symmetric, suggesting that they share common sources. It is hard to explain that hemodynamic responses elicit positive signals in some voxels and negative signals in the other. On the other hand, considering membrane dipoles, polarities of OCT signals can be positive and negative depending on orientations of scattering particles relative to the incident light. Therefore, the present study suggests that fOCT signals are induced by the reorientation of membrane dipoles.
Collapse
Affiliation(s)
- Kai-Shih Chiu
- Biomedical Optical Imaging Lab., Department of Photonics, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, No. 1001, Daxue Rd., 30010, East Dist., Hsinchu, Taiwan, ROC
| | - Manabu Tanifuji
- Department of Life Science and Medical Bioscience, School of Advanced Science and Engineering, Waseda University, 2-2 Wakamatsu-cho, 162-8480, Shinjuku, Tokyo, Japan
| | - Chia-Wei Sun
- Biomedical Optical Imaging Lab., Department of Photonics, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, No. 1001, Daxue Rd., 30010, East Dist., Hsinchu, Taiwan, ROC.,Institute of Biomedical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, No. 1001, Daxue Rd., 30010, East Dist., Hsinchu, Taiwan, ROC.,Medical Device Innovation and Translation Center, National Yang Ming Chiao Tung University, No. 155, Sec. 2, Linong St., 112304, Beitou Dist., Taipei, Taiwan, ROC
| | - Uma Maheswari Rajagopalan
- Department of Mechanical Engineering, Shibaura Institute of Technology, 3-7-5 Toyosu, 135-8548, Koto City, Tokyo, Japan
| | - Yu Nakamichi
- Department of Mechanical Engineering, Faculty of Engineering, Sanyo-Onoda City University, 1-1-1 Daigaku-dori, 756-0884, Sanyo-Onoda, Yamaguchi, Japan
| |
Collapse
|
2
|
Etievant A, Monnin J, Lihoreau T, Tamadazte B, Rougeot P, Magnin E, Tavernier L, Pazart L, Haffen E. Comparison of Noninvasive Imagery Methods to Observe Healthy and Degenerated Olfactory Epithelium in Mice for the Early Diagnosis of Neurodegenerative Diseases. Front Neuroanat 2020; 14:34. [PMID: 32760253 PMCID: PMC7371997 DOI: 10.3389/fnana.2020.00034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 05/28/2020] [Indexed: 11/13/2022] Open
Abstract
Olfactory dysfunction could be an early and reliable indicator for the diagnosis of neurodegenerative disorders such as Alzheimer and Parkinson's diseases. In this paper, we compare the potential of different noninvasive medical imaging modalities (optical coherence tomography, confocal microscopy, and fluorescence endomicroscopy) to distinguish how the olfactory epithelium, both at the cellular and the structural levels, is altered. Investigations were carried out on three experimental groups: two pathological groups (mice models with deliberately altered olfactory epithelium and Alzheimer's disease transgenic mice models) were compared with healthy mice models. As histological staining, the three tested noninvasive imaging tools demonstrated the general tubular organization of the olfactory epithelium on healthy mice. Contrary to OCT, confocal microscopy, and endomicroscopy allowed visualizing the inner structure of olfactory epithelium as well as its morphological or functional changes on pathological models, alterations classically observed with histological assessment. The results could lead to relevant development of imaging tools for noninvasive and early diagnosis of neurodegenerative diseases through the in situ characterization of the olfactory epithelium.
Collapse
Affiliation(s)
- Adeline Etievant
- Laboratoire de Neurosciences Intégratives et Cliniques, Université Bourgogne-Franche-Comté, Université de Franche-Comté, Besançon, France
| | - Julie Monnin
- Laboratoire de Neurosciences Intégratives et Cliniques, Université Bourgogne-Franche-Comté, Université de Franche-Comté, Besançon, France.,CHU Besançon, INSERM, CIC 1431, Centre d'Investigation Clinique, Besançon, France
| | - Thomas Lihoreau
- CHU Besançon, INSERM, CIC 1431, Centre d'Investigation Clinique, Besançon, France
| | - Brahim Tamadazte
- FEMTO-ST, Dép. AS2M, CNRS, Université Bourgogne Franche-Comté, 24 rue Savary, Besançon, France.,Institut des Systémes Intelligents et de Robotique, Sorbonne Université, CNRS, UMR 7222, Paris, France
| | - Patrick Rougeot
- FEMTO-ST, Dép. AS2M, CNRS, Université Bourgogne Franche-Comté, 24 rue Savary, Besançon, France
| | - Eloi Magnin
- Laboratoire de Neurosciences Intégratives et Cliniques, Université Bourgogne-Franche-Comté, Université de Franche-Comté, Besançon, France
| | - Laurent Tavernier
- Service d'oto-Rhino-Laryngologie et Chirurgie Cervico-Faciale, CHU Besançon, Université Bourgogne-Franche-Comté, Besançon, France
| | - Lionel Pazart
- Laboratoire de Neurosciences Intégratives et Cliniques, Université Bourgogne-Franche-Comté, Université de Franche-Comté, Besançon, France.,CHU Besançon, INSERM, CIC 1431, Centre d'Investigation Clinique, Besançon, France
| | - Emmanuel Haffen
- Laboratoire de Neurosciences Intégratives et Cliniques, Université Bourgogne-Franche-Comté, Université de Franche-Comté, Besançon, France.,CHU Besançon, INSERM, CIC 1431, Centre d'Investigation Clinique, Besançon, France
| |
Collapse
|
3
|
Speckle modulation enables high-resolution wide-field human brain tumor margin detection and in vivo murine neuroimaging. Sci Rep 2019; 9:10388. [PMID: 31316099 PMCID: PMC6637128 DOI: 10.1038/s41598-019-45902-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 06/05/2019] [Indexed: 11/18/2022] Open
Abstract
Current in vivo neuroimaging techniques provide limited field of view or spatial resolution and often require exogenous contrast. These limitations prohibit detailed structural imaging across wide fields of view and hinder intraoperative tumor margin detection. Here we present a novel neuroimaging technique, speckle-modulating optical coherence tomography (SM-OCT), which allows us to image the brains of live mice and ex vivo human samples with unprecedented resolution and wide field of view using only endogenous contrast. The increased visibility provided by speckle elimination reveals white matter fascicles and cortical layer architecture in brains of live mice. To our knowledge, the data reported herein represents the highest resolution imaging of murine white matter structure achieved in vivo across a wide field of view of several millimeters. When applied to an orthotopic murine glioblastoma xenograft model, SM-OCT readily identifies brain tumor margins with resolution of approximately 10 μm. SM-OCT of ex vivo human temporal lobe tissue reveals fine structures including cortical layers and myelinated axons. Finally, when applied to an ex vivo sample of a low-grade glioma resection margin, SM-OCT is able to resolve the brain tumor margin. Based on these findings, SM-OCT represents a novel approach for intraoperative tumor margin detection and in vivo neuroimaging.
Collapse
|
4
|
Yecies D, Liba O, Zerda ADL, Grant GA. Intraoperative Imaging Modalities and the Potential Role of Speckle Modulating Optical Coherence Tomography. Neurosurgery 2018; 65:74-77. [PMID: 31076788 DOI: 10.1093/neuros/nyy199] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 05/01/2018] [Indexed: 11/12/2022] Open
Affiliation(s)
- Derek Yecies
- Department of Structural Biology, Stanford University, Stanford, California.,Department of Neurosurgery, Stan-ford University, Stanford, California
| | - Orly Liba
- Department of Structural Biology, Stanford University, Stanford, California.,Department of Electrical Engineering, Stanford University, Stanford, California.,Molecular Imaging Program, Stanford University, Stanford, California.,Bio-X Program, Stanford University, Stanford, California
| | - Adam de la Zerda
- Department of Structural Biology, Stanford University, Stanford, California.,Department of Electrical Engineering, Stanford University, Stanford, California.,Molecular Imaging Program, Stanford University, Stanford, California.,Bio-X Program, Stanford University, Stanford, California.,Biophysics Program, Stanford University, Stanford, California.,The Chan Zuckerberg Biohub, San Francisco, California
| | - Gerald A Grant
- Department of Neurosurgery, Stan-ford University, Stanford, California
| |
Collapse
|
5
|
Nakamichi Y, Kalatsky VA, Watanabe H, Sato T, Rajagopalan UM, Tanifuji M. 3D topology of orientation columns in visual cortex revealed by functional optical coherence tomography. J Neurophysiol 2018; 119:1562-1575. [PMID: 29357452 DOI: 10.1152/jn.00921.2017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Orientation tuning is a canonical neuronal response property of six-layer visual cortex that is encoded in pinwheel structures with center orientation singularities. Optical imaging of intrinsic signals enables us to map these surface two-dimensional (2D) structures, whereas lack of appropriate techniques has not allowed us to visualize depth structures of orientation coding. In the present study, we performed functional optical coherence tomography (fOCT), a technique capable of acquiring a 3D map of the intrinsic signals, to study the topology of orientation coding inside the cat visual cortex. With this technique, for the first time, we visualized columnar assemblies in orientation coding that had been predicted from electrophysiological recordings. In addition, we found that the columnar structures were largely distorted around pinwheel centers: center singularities were not rigid straight lines running perpendicularly to the cortical surface but formed twisted string-like structures inside the cortex that turned and extended horizontally through the cortex. Looping singularities were observed with their respective termini accessing the same cortical surface via clockwise and counterclockwise orientation pinwheels. These results suggest that a 3D topology of orientation coding cannot be fully anticipated from 2D surface measurements. Moreover, the findings demonstrate the utility of fOCT as an in vivo mesoscale imaging method for mapping functional response properties of cortex in the depth axis. NEW & NOTEWORTHY We used functional optical coherence tomography (fOCT) to visualize three-dimensional structure of the orientation columns with millimeter range and micrometer spatial resolution. We validated vertically elongated columnar structure in iso-orientation domains. The columnar structure was distorted around pinwheel centers. An orientation singularity formed a string with tortuous trajectories inside the cortex and connected clockwise and counterclockwise pinwheel centers in the surface orientation map. The results were confirmed by comparisons with conventional optical imaging and electrophysiological recordings.
Collapse
Affiliation(s)
- Yu Nakamichi
- Laboratory for Integrative Neural Systems, RIKEN Brain Science Institute, Wako, Saitama Japan
| | - Valery A Kalatsky
- Department of Electrical and Computer Engineering, University of Houston , Houston, Texas
| | - Hideyuki Watanabe
- Laboratory for Integrative Neural Systems, RIKEN Brain Science Institute, Wako, Saitama Japan
| | - Takayuki Sato
- Laboratory for Integrative Neural Systems, RIKEN Brain Science Institute, Wako, Saitama Japan
| | | | - Manabu Tanifuji
- Laboratory for Integrative Neural Systems, RIKEN Brain Science Institute, Wako, Saitama Japan.,Department of Complexity Science and Engineering, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba , Japan.,Department of Life Science and Medicine, Bio-Science Faculty of Science and Engineering, Waseda University, Shinjuku, Tokyo , Japan
| |
Collapse
|
6
|
Mokbul MI. Optical Coherence Tomography: Basic Concepts and Applications in Neuroscience Research. J Med Eng 2017; 2017:3409327. [PMID: 29214158 PMCID: PMC5682075 DOI: 10.1155/2017/3409327] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 06/22/2017] [Accepted: 09/14/2017] [Indexed: 12/28/2022] Open
Abstract
Optical coherence tomography is a micrometer-scale imaging modality that permits label-free, cross-sectional imaging of biological tissue microstructure using tissue backscattering properties. After its invention in the 1990s, OCT is now being widely used in several branches of neuroscience as well as other fields of biomedical science. This review study reports an overview of OCT's applications in several branches or subbranches of neuroscience such as neuroimaging, neurology, neurosurgery, neuropathology, and neuroembryology. This study has briefly summarized the recent applications of OCT in neuroscience research, including a comparison, and provides a discussion of the remaining challenges and opportunities in addition to future directions. The chief aim of the review study is to draw the attention of a broad neuroscience community in order to maximize the applications of OCT in other branches of neuroscience too, and the study may also serve as a benchmark for future OCT-based neuroscience research. Despite some limitations, OCT proves to be a useful imaging tool in both basic and clinical neuroscience research.
Collapse
Affiliation(s)
- Mobin Ibne Mokbul
- Notre Dame College, Motijheel Circular Road, Arambagh, Motijheel, Dhaka 1000, Bangladesh
| |
Collapse
|
7
|
In Vivo Mesoscopic Voltage-Sensitive Dye Imaging of Brain Activation. Sci Rep 2016; 6:25269. [PMID: 27125318 PMCID: PMC4850485 DOI: 10.1038/srep25269] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 04/14/2016] [Indexed: 02/02/2023] Open
Abstract
Functional mapping of brain activity is important in elucidating how neural networks operate in the living brain. The whisker sensory system of rodents is an excellent model to study peripherally evoked neural activity in the central nervous system. Each facial whisker is represented by discrete modules of neurons all along the pathway leading to the neocortex. These modules are called "barrels" in layer 4 of the primary somatosensory cortex. Their location (approximately 300-500 μm below cortical surface) allows for convenient imaging of whisker-evoked neural activity in vivo. Fluorescence laminar optical tomography (FLOT) provides depth-resolved fluorescence molecular information with an imaging depth of a few millimeters. Angled illumination and detection configurations can improve both resolution and penetration depth. We applied angled FLOT (aFLOT) to record 3D neural activities evoked in the whisker system of mice by deflection of a single whisker in vivo. A 100 μm capillary and a pair of microelectrodes were inserted to the mouse brain to test the capability of the imaging system. The results show that it is possible to obtain 3D functional maps of the sensory periphery in the brain. This approach can be broadly applicable to functional imaging of other brain structures.
Collapse
|
8
|
Watanabe H, Rajagopalan UM, Nakamichi Y, Igarashi KM, Kadono H, Tanifuji M. Functional optical coherence tomography of rat olfactory bulb with periodic odor stimulation. BIOMEDICAL OPTICS EXPRESS 2016; 7:841-54. [PMID: 27231593 PMCID: PMC4866460 DOI: 10.1364/boe.7.000841] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 02/07/2016] [Accepted: 02/08/2016] [Indexed: 05/30/2023]
Abstract
In rodent olfactory bulb (OB), optical intrinsic signal imaging (OISI) is commonly used to investigate functional maps to odorant stimulations. However, in such studies, the spatial resolution in depth direction (z-axis) is lost because of the integration of light from different depths. To solve this problem, we propose functional optical coherence tomography (fOCT) with periodic stimulation and continuous recording. In fOCT experiments of in vivo rat OB, propionic acid and m-cresol were used as odor stimulus presentations. Such a periodic stimulation enabled us to detect the specific odor-responses from highly scattering brain tissue. Swept source OCT operating at a wavelength of 1334 nm and a frequency of 20 kHz, was employed with theoretical depth and lateral resolutions of 6.7 μm and 15.4 μm, respectively. We succeeded in visualizing 2D cross sectional fOCT map across the neural layer structure of OCT in vivo. The detected fOCT signals corresponded to a few glomeruli of the medial and lateral parts of dorsal OB. We also obtained 3D fOCT maps, which upon integration across z-axis agreed well with OISI results. We expect such an approach to open a window for investigating and possibly addressing toward inter/intra-layer connections at high resolutions in the future.
Collapse
Affiliation(s)
- Hideyuki Watanabe
- Laboratory for Integrative Neural Systems, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako-city, Saitama, 351-0198, Japan
- Course of Health Science, Graduate school of Medicine, Osaka University, 1-7 Yamada-oka, Suita, Osaka, 565-0871, Japan
| | - Uma Maheswari Rajagopalan
- Department of Food Life Sciences, Faculty of Food Life Sciences, Toyo University, 1-1-1 Izumino, Itakura-machi, Ora-gun, Gunma, 374-0193, Japan
| | - Yu Nakamichi
- Laboratory for Integrative Neural Systems, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako-city, Saitama, 351-0198, Japan
| | - Kei M. Igarashi
- Department of Anatomy and Neurobiology School of Medicine University of California, Irvine Hall Room 112, California 92697, USA
| | - Hirofumi Kadono
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama-city, Saitama, 338-08570, Japan
| | - Manabu Tanifuji
- Laboratory for Integrative Neural Systems, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako-city, Saitama, 351-0198, Japan
| |
Collapse
|
9
|
Nasal-to-CNS drug delivery: where are we now and where are we heading? An industrial perspective. Ther Deliv 2012; 3:195-208. [PMID: 22834197 DOI: 10.4155/tde.11.149] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Delivery of drug therapeutics across the blood-brain barrier is a challenging task for pharmaceutical scientists. Nasal-to-CNS drug delivery has shown promising results in preclinical efficacy models and investigatory human clinical trials. The further development of this technology with respect to the establishment of valid, predictable preclinical species models, translatable pharmacokinetic-pharmacodynamic relationships and definition of toxicology impact will help attract additional pharmaceutical investment in this drug-delivery approach. Further discoveries in nasal nanotechnology, targeted delivery devices and diagnostic olfactory imaging will serve to fuel the advancements in this area of drug delivery.
Collapse
|
10
|
Watanabe H, Rajagopalan UM, Nakamichi Y, Igarashi KM, Kadono H, Tanifuji M. Swept source optical coherence tomography as a tool for real time visualization and localization of electrodes used in electrophysiological studies of brain in vivo. BIOMEDICAL OPTICS EXPRESS 2011; 2:3129-3134. [PMID: 22076273 PMCID: PMC3207381 DOI: 10.1364/boe.2.003129] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2011] [Revised: 10/14/2011] [Accepted: 10/20/2011] [Indexed: 05/30/2023]
Abstract
In studies of in vivo extracellular recording, we usually penetrate electrodes almost blindly into the neural tissue, in order to detect the neural activity from an expected target location at a certain depth. After the recording, it is necessary for us to determine the position of the electrodes precisely. Generally, to identify the position of the electrode, one method is to examine the postmortem tissue sample at micron resolution. The other method is using MRI and it does not have enough resolution to resolve the neural structures. To solve such problems, we propose swept source optical coherence tomography (SS-OCT) as a tool to visualize the cross-sectional image of the neural target structure along with the penetrating electrode. We focused on a rodent olfactory bulb (OB) as the target. We succeeded in imaging both the OB layer structure and the penetrating electrode, simultaneously. The method has the advantage of detecting the electrode shape and the position in real time, in vivo. These results indicate the possibility of using SS-OCT as a powerful tool for guiding the electrode into the target tissue precisely in real time and localizing the electrode tip during electrophysiological recordings.
Collapse
Affiliation(s)
- Hideyuki Watanabe
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama-city, Saitama, 338-08570, Japan
- Laboratory for Integrative Neural Systems, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako-city, Saitama, 351-0198, Japan
| | - Uma Maheswari Rajagopalan
- Laboratory for Integrative Neural Systems, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako-city, Saitama, 351-0198, Japan
| | - Yu Nakamichi
- Laboratory for Integrative Neural Systems, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako-city, Saitama, 351-0198, Japan
| | - Kei M. Igarashi
- Centre for the Biology of Memory, Medical-Technical Research Centre Norwegian University of Science and Technology, Olav Ktrres gate 9, 7030 Trondheim, Norway
- Department of Physiology, Graduate of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033 Japan
- Laboratory for Integrative Neural Systems, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako-city, Saitama, 351-0198, Japan
| | - Hirofumi Kadono
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama-city, Saitama, 338-08570, Japan
| | - Manabu Tanifuji
- Laboratory for Integrative Neural Systems, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako-city, Saitama, 351-0198, Japan
| |
Collapse
|