1
|
King H, Reiber M, Philippi V, Stirling H, Aulehner K, Bankstahl M, Bleich A, Buchecker V, Glasenapp A, Jirkof P, Miljanovic N, Schönhoff K, von Schumann L, Leenaars C, Potschka H. Anesthesia and analgesia for experimental craniotomy in mice and rats: a systematic scoping review comparing the years 2009 and 2019. Front Neurosci 2023; 17:1143109. [PMID: 37207181 PMCID: PMC10188949 DOI: 10.3389/fnins.2023.1143109] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 03/27/2023] [Indexed: 05/21/2023] Open
Abstract
Experimental craniotomies are a common surgical procedure in neuroscience. Because inadequate analgesia appears to be a problem in animal-based research, we conducted this review and collected information on management of craniotomy-associated pain in laboratory mice and rats. A comprehensive search and screening resulted in the identification of 2235 studies, published in 2009 and 2019, describing craniotomy in mice and/or rats. While key features were extracted from all studies, detailed information was extracted from a random subset of 100 studies/year. Reporting of perioperative analgesia increased from 2009 to 2019. However, the majority of studies from both years did not report pharmacologic pain management. Moreover, reporting of multimodal treatments remained at a low level, and monotherapeutic approaches were more common. Among drug groups, reporting of pre- and postoperative administration of non-steroidal anti-inflammatory drugs, opioids, and local anesthetics in 2019 exceeded that of 2009. In summary, these results suggest that inadequate analgesia and oligoanalgesia are persistent issues associated with experimental intracranial surgery. This underscores the need for intensified training of those working with laboratory rodents subjected to craniotomies. Systematic review registration https://osf.io/7d4qe.
Collapse
Affiliation(s)
- Hannah King
- Institute of Pharmacology, Toxicology, and Pharmacy, Ludwig Maximilian University of Munich, Munich, Germany
| | - Maria Reiber
- Institute of Pharmacology, Toxicology, and Pharmacy, Ludwig Maximilian University of Munich, Munich, Germany
| | - Vanessa Philippi
- Institute of Pharmacology, Toxicology, and Pharmacy, Ludwig Maximilian University of Munich, Munich, Germany
| | - Helen Stirling
- Institute of Pharmacology, Toxicology, and Pharmacy, Ludwig Maximilian University of Munich, Munich, Germany
| | - Katharina Aulehner
- Institute of Pharmacology, Toxicology, and Pharmacy, Ludwig Maximilian University of Munich, Munich, Germany
| | - Marion Bankstahl
- Hannover Medical School, Institute for Laboratory Animal Science, Hanover, Germany
| | - André Bleich
- Hannover Medical School, Institute for Laboratory Animal Science, Hanover, Germany
| | - Verena Buchecker
- Institute of Pharmacology, Toxicology, and Pharmacy, Ludwig Maximilian University of Munich, Munich, Germany
| | - Aylina Glasenapp
- Hannover Medical School, Institute for Laboratory Animal Science, Hanover, Germany
| | - Paulin Jirkof
- Office for Animal Welfare and 3Rs, University of Zurich, Zurich, Switzerland
| | - Nina Miljanovic
- Institute of Pharmacology, Toxicology, and Pharmacy, Ludwig Maximilian University of Munich, Munich, Germany
| | - Katharina Schönhoff
- Institute of Pharmacology, Toxicology, and Pharmacy, Ludwig Maximilian University of Munich, Munich, Germany
| | - Lara von Schumann
- Institute of Pharmacology, Toxicology, and Pharmacy, Ludwig Maximilian University of Munich, Munich, Germany
| | - Cathalijn Leenaars
- Hannover Medical School, Institute for Laboratory Animal Science, Hanover, Germany
| | - Heidrun Potschka
- Institute of Pharmacology, Toxicology, and Pharmacy, Ludwig Maximilian University of Munich, Munich, Germany
- *Correspondence: Heidrun Potschka,
| |
Collapse
|
2
|
DePaoli D, Côté DC, Bouma BE, Villiger M. Endoscopic imaging of white matter fiber tracts using polarization-sensitive optical coherence tomography. Neuroimage 2022; 264:119755. [PMID: 36400379 PMCID: PMC9802682 DOI: 10.1016/j.neuroimage.2022.119755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 10/29/2022] [Accepted: 11/14/2022] [Indexed: 11/17/2022] Open
Abstract
Polarization sensitive optical coherence tomography (PSOCT) has been shown to image and delineate white matter fibers in a label-free manner by revealing optical birefringence within the myelin sheath using a microscope setup. In this proof-of-concept study, we adapt recent advancements in endoscopic PSOCT to perform depth-resolved imaging of white matter structures deep inside intact porcine brain tissue ex-vivo, through a small, rotational fiber probe. The probe geometry is comparable to microelectrodes currently used in neurosurgical interventions. The presented imaging system is mobile, robust, and uses biologically safe levels of optical radiation making it well suited for clinical translation. In neurosurgery, where accuracy is imperative, endoscopic PSOCT through a narrow-gauge fiber probe could provide intra-operative feedback on the location of critical white matter structures.
Collapse
Affiliation(s)
- Damon DePaoli
- Harvard Medical School, Boston, MA 02115, USA,Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Daniel C. Côté
- CERVO Brain Research Center, Université Laval, Quebec City, Quebec G1E 1T2, Canada
| | - Brett E. Bouma
- Harvard Medical School, Boston, MA 02115, USA,Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA,Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA 02142, USA
| | - Martin Villiger
- Harvard Medical School, Boston, MA 02115, USA,Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA,Corresponding author. (M. Villiger)
| |
Collapse
|
3
|
Marrese M, Offerhaus H, Paardekam E, Iannuzzi D. 70 μm diameter optical probe for common-path optical coherence tomography in air and liquids. OPTICS LETTERS 2018; 43:5929-5932. [PMID: 30547972 DOI: 10.1364/ol.43.005929] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 11/05/2018] [Indexed: 06/09/2023]
Abstract
We investigate and validate a novel method to fabricate ultrathin optical probes for common-path optical coherence tomography (CP-OCT). The probes are obtained using a 65 μm barium titanate microsphere inserted into an inward concave cone chemically etched at the end of a single-mode fiber. We demonstrate that the high refractive index (n=1.95) of the barium titanate microspheres allows one to maintain high sensitivity even while imaging in liquids, reaching a sensitivity of 83 dB. Due to its low cost, flexibility, and ease of use, the probe holds promise for the development of a new generation of ultrathin needle-based OCT systems.
Collapse
|
4
|
Ramakonar H, Quirk BC, Kirk RW, Li J, Jacques A, Lind CRP, McLaughlin RA. Intraoperative detection of blood vessels with an imaging needle during neurosurgery in humans. SCIENCE ADVANCES 2018; 4:eaav4992. [PMID: 30585293 PMCID: PMC6300404 DOI: 10.1126/sciadv.aav4992] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 11/20/2018] [Indexed: 05/05/2023]
Abstract
Intracranial hemorrhage can be a devastating complication associated with needle biopsies of the brain. Hemorrhage can occur to vessels located adjacent to the biopsy needle as tissue is aspirated into the needle and removed. No intraoperative technology exists to reliably identify blood vessels that are at risk of damage. To address this problem, we developed an "imaging needle" that can visualize nearby blood vessels in real time. The imaging needle contains a miniaturized optical coherence tomography probe that allows differentiation of blood flow and tissue. In 11 patients, we were able to intraoperatively detect blood vessels (diameter, >500 μm) with a sensitivity of 91.2% and a specificity of 97.7%. This is the first reported use of an optical coherence tomography needle probe in human brain in vivo. These results suggest that imaging needles may serve as a valuable tool in a range of neurosurgical needle interventions.
Collapse
Affiliation(s)
- Hari Ramakonar
- Sir Charles Gairdner Hospital, Nedlands, Western Australia, Australia
- School of Surgery, University of Western Australia, Crawley, Western Australia, Australia
| | - Bryden C. Quirk
- ARC Centre of Excellence for Nanoscale Biophotonics, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, South Australia, Australia
- Adelaide Medical School, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, South Australia, Australia
- Institute for Photonics and Advanced Sensing, University of Adelaide, Adelaide, South Australia, Australia
| | - Rodney W. Kirk
- ARC Centre of Excellence for Nanoscale Biophotonics, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, South Australia, Australia
- Adelaide Medical School, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, South Australia, Australia
- Institute for Photonics and Advanced Sensing, University of Adelaide, Adelaide, South Australia, Australia
| | - Jiawen Li
- ARC Centre of Excellence for Nanoscale Biophotonics, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, South Australia, Australia
- Adelaide Medical School, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, South Australia, Australia
- Institute for Photonics and Advanced Sensing, University of Adelaide, Adelaide, South Australia, Australia
| | - Angela Jacques
- Sir Charles Gairdner Hospital, Nedlands, Western Australia, Australia
- Institute for Health Research, University of Notre Dame, Fremantle, Western Australia, Australia
| | - Christopher R. P. Lind
- Sir Charles Gairdner Hospital, Nedlands, Western Australia, Australia
- School of Surgery, University of Western Australia, Crawley, Western Australia, Australia
| | - Robert A. McLaughlin
- ARC Centre of Excellence for Nanoscale Biophotonics, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, South Australia, Australia
- Adelaide Medical School, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, South Australia, Australia
- Institute for Photonics and Advanced Sensing, University of Adelaide, Adelaide, South Australia, Australia
- Corresponding author.
| |
Collapse
|
5
|
Li J, Quirk BC, Noble PB, Kirk RW, Sampson DD, McLaughlin RA. Flexible needle with integrated optical coherence tomography probe for imaging during transbronchial tissue aspiration. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:1-5. [PMID: 29022301 DOI: 10.1117/1.jbo.22.10.106002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 09/08/2017] [Indexed: 06/07/2023]
Abstract
Transbronchial needle aspiration (TBNA) of small lesions or lymph nodes in the lung may result in nondiagnostic tissue samples. We demonstrate the integration of an optical coherence tomography (OCT) probe into a 19-gauge flexible needle for lung tissue aspiration. This probe allows simultaneous visualization and aspiration of the tissue. By eliminating the need for insertion and withdrawal of a separate imaging probe, this integrated design minimizes the risk of dislodging the needle from the lesion prior to aspiration and may facilitate more accurate placement of the needle. Results from in situ imaging in a sheep lung show clear distinction between solid tissue and two typical constituents of nondiagnostic samples (adipose and lung parenchyma). Clinical translation of this OCT-guided aspiration needle holds promise for improving the diagnostic yield of TBNA.
Collapse
Affiliation(s)
- Jiawen Li
- University of Adelaide, Adelaide Medical School, Australian Research Council Centre of Excellence fo, Australia
- University of Adelaide, Institute for Photonics and Advanced Sensing, Adelaide, South Australia, Australia
| | - Bryden C Quirk
- University of Adelaide, Adelaide Medical School, Australian Research Council Centre of Excellence fo, Australia
- University of Adelaide, Institute for Photonics and Advanced Sensing, Adelaide, South Australia, Australia
| | - Peter B Noble
- University of Western Australia, School of Human Sciences, Perth, Western Australia, Australia
- University of Western Australia, School of Paediatrics and Child Health, Centre for Neonatal Researc, Australia
| | - Rodney W Kirk
- University of Adelaide, Adelaide Medical School, Australian Research Council Centre of Excellence fo, Australia
- University of Adelaide, Institute for Photonics and Advanced Sensing, Adelaide, South Australia, Australia
| | - David D Sampson
- University of Western Australia, School of Electrical, Electronic and Computer Engineering, Optical+, Australia
- University of Western Australia, Centre for Microscopy, Characterisation and Analysis, Perth, Wester, Australia
| | - Robert A McLaughlin
- University of Adelaide, Adelaide Medical School, Australian Research Council Centre of Excellence fo, Australia
- University of Adelaide, Institute for Photonics and Advanced Sensing, Adelaide, South Australia, Australia
| |
Collapse
|
6
|
Men J, Huang Y, Solanki J, Zeng X, Alex A, Jerwick J, Zhang Z, Tanzi RE, Li A, Zhou C. Optical Coherence Tomography for Brain Imaging and Developmental Biology. IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS : A PUBLICATION OF THE IEEE LASERS AND ELECTRO-OPTICS SOCIETY 2016; 22:6803213. [PMID: 27721647 PMCID: PMC5049888 DOI: 10.1109/jstqe.2015.2513667] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Optical coherence tomography (OCT) is a promising research tool for brain imaging and developmental biology. Serving as a three-dimensional optical biopsy technique, OCT provides volumetric reconstruction of brain tissues and embryonic structures with micrometer resolution and video rate imaging speed. Functional OCT enables label-free monitoring of hemodynamic and metabolic changes in the brain in vitro and in vivo in animal models. Due to its non-invasiveness nature, OCT enables longitudinal imaging of developing specimens in vivo without potential damage from surgical operation, tissue fixation and processing, and staining with exogenous contrast agents. In this paper, various OCT applications in brain imaging and developmental biology are reviewed, with a particular focus on imaging heart development. In addition, we report findings on the effects of a circadian gene (Clock) and high-fat-diet on heart development in Drosophila melanogaster. These findings contribute to our understanding of the fundamental mechanisms connecting circadian genes and obesity to heart development and cardiac diseases.
Collapse
Affiliation(s)
- Jing Men
- Department of Electrical and Computer Engineering, Center for Photonics and Nanoelectronics, and Bioengineering Program, Lehigh University, Bethlehem, PA, USA, 18015
| | - Yongyang Huang
- Department of Electrical and Computer Engineering, Center for Photonics and Nanoelectronics, and Bioengineering Program, Lehigh University, Bethlehem, PA, USA, 18015
| | - Jitendra Solanki
- Department of Electrical and Computer Engineering, Center for Photonics and Nanoelectronics, and Bioengineering Program, Lehigh University, Bethlehem, PA, USA, 18015
| | - Xianxu Zeng
- Department of Electrical and Computer Engineering, Center for Photonics and Nanoelectronics, and Bioengineering Program, Lehigh University, Bethlehem, PA, USA, 18015
- Third Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, P.R. China, 450000
| | - Aneesh Alex
- Department of Electrical and Computer Engineering, Center for Photonics and Nanoelectronics, and Bioengineering Program, Lehigh University, Bethlehem, PA, USA, 18015
| | - Jason Jerwick
- Department of Electrical and Computer Engineering, Center for Photonics and Nanoelectronics, and Bioengineering Program, Lehigh University, Bethlehem, PA, USA, 18015
| | - Zhan Zhang
- Third Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, P.R. China, 450000
| | - Rudolph E. Tanzi
- Genetics and Aging Research Unit, Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA, 02129
| | - Airong Li
- Genetics and Aging Research Unit, Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA, 02129
| | - Chao Zhou
- Department of Electrical and Computer Engineering, Center for Photonics and Nanoelectronics, and Bioengineering Program, Lehigh University, Bethlehem, PA, USA, 18015
| |
Collapse
|
7
|
Mura M, Iannetta D, Nasini F, Barca F, Peiretti E, Engelbrecht L, de Smet MD, Verbraak F. Use of a new intra-ocular spectral domain optical coherence tomography in vitreoretinal surgery. Acta Ophthalmol 2016; 94:246-52. [PMID: 26842922 DOI: 10.1111/aos.12961] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Accepted: 11/24/2015] [Indexed: 01/08/2023]
Abstract
PURPOSE To describe the use of a novel intra-ocular side-scanning probe enabling the acquisition of spectral-domain optical coherence tomography (SD-OCT) images during surgery in a series of patients with complex forms of retinal detachment. METHODS A 23-gauge, side-scanning SD-OCT probe (C7 System; LightLab Imaging, Inc/St Jude Medical, St. Paul, MN, USA) in a 20-gauge catheter, was used to acquire the intra-operative OCT images in seven patients with vitreoretinal diseases. Twenty-five gauge pars plana vitrectomy (PPV) was performed in every patient in a standard fashion. After enlarging the temporal sclerotomy to a 20-gauge port, all the patients were scanned with intra-ocular side-scanning SD-OCT, during different steps of the surgery based on surgeon needs. Scans were recorded real time and directly evaluated on a screen during surgery. Optical coherence tomography (OCT) scans were judged beneficial when they would recognize structures otherwise not seen on biomicroscopy. RESULTS The intra-ocular SD-OCT has been helpful in acquiring extra information during vitreoretinal surgery such as the detection of the presence of otherwise invisible membranes (epiretinal membrane, subretinal membrane), the location of small tears and the identification of the retinal plane under suboptimal conditions for visualization. CONCLUSION The use of an intra-ocular SD-OCT can expand upon visual cues during surgery, helping in the decision-making process and allowing additional deliberate surgical manoeuvres aimed at improving surgical outcomes.
Collapse
Affiliation(s)
- Marco Mura
- Department of Ophthalmology; Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands
| | - Danilo Iannetta
- Department of Ophthalmology; Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands
- Department of Ophthalmology; University of Tor Vergata; Rome Italy
| | - Francesco Nasini
- Department of Ophthalmology; Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands
- Department of Surgical, Medical, Molecular and Critical Area Pathology; University of Pisa; Pisa Italy
| | - Francesco Barca
- Department of Ophthalmology; Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands
| | - Enrico Peiretti
- Department of Ophthalmology; Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands
- Department of Surgical Science; University of Cagliari; Cagliari Italy
| | - Leonore Engelbrecht
- Department of Ophthalmology; Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands
| | | | - Frank Verbraak
- Department of Ophthalmology; Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands
- Laser Center; Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands
| |
Collapse
|
8
|
Wieser W, Draxinger W, Klein T, Karpf S, Pfeiffer T, Huber R. High definition live 3D-OCT in vivo: design and evaluation of a 4D OCT engine with 1 GVoxel/s. BIOMEDICAL OPTICS EXPRESS 2014; 5:2963-77. [PMID: 25401010 PMCID: PMC4230855 DOI: 10.1364/boe.5.002963] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Revised: 06/24/2014] [Accepted: 06/25/2014] [Indexed: 05/18/2023]
Abstract
We present a 1300 nm OCT system for volumetric real-time live OCT acquisition and visualization at 1 billion volume elements per second. All technological challenges and problems associated with such high scanning speed are discussed in detail as well as the solutions. In one configuration, the system acquires, processes and visualizes 26 volumes per second where each volume consists of 320 x 320 depth scans and each depth scan has 400 usable pixels. This is the fastest real-time OCT to date in terms of voxel rate. A 51 Hz volume rate is realized with half the frame number. In both configurations the speed can be sustained indefinitely. The OCT system uses a 1310 nm Fourier domain mode locked (FDML) laser operated at 3.2 MHz sweep rate. Data acquisition is performed with two dedicated digitizer cards, each running at 2.5 GS/s, hosted in a single desktop computer. Live real-time data processing and visualization are realized with custom developed software on an NVidia GTX 690 dual graphics processing unit (GPU) card. To evaluate potential future applications of such a system, we present volumetric videos captured at 26 and 51 Hz of planktonic crustaceans and skin.
Collapse
Affiliation(s)
- Wolfgang Wieser
- Lehrstuhl für BioMolekulare Optik, Fakultät für Physik, Ludwig-Maximilians-Universität München, Oettingenstr. 67, 80538 Munich, Germany
| | - Wolfgang Draxinger
- Lehrstuhl für BioMolekulare Optik, Fakultät für Physik, Ludwig-Maximilians-Universität München, Oettingenstr. 67, 80538 Munich, Germany
| | - Thomas Klein
- Lehrstuhl für BioMolekulare Optik, Fakultät für Physik, Ludwig-Maximilians-Universität München, Oettingenstr. 67, 80538 Munich, Germany
| | - Sebastian Karpf
- Lehrstuhl für BioMolekulare Optik, Fakultät für Physik, Ludwig-Maximilians-Universität München, Oettingenstr. 67, 80538 Munich, Germany
| | - Tom Pfeiffer
- Lehrstuhl für BioMolekulare Optik, Fakultät für Physik, Ludwig-Maximilians-Universität München, Oettingenstr. 67, 80538 Munich, Germany
| | - Robert Huber
- Lehrstuhl für BioMolekulare Optik, Fakultät für Physik, Ludwig-Maximilians-Universität München, Oettingenstr. 67, 80538 Munich, Germany
- Institut für Biomedizinische Optik, Universität zu Lübeck, Peter-Monnik-Weg 4, 23562 Lübeck Germany
| |
Collapse
|
9
|
Quirk BC, McLaughlin RA, Pagnozzi AM, Kennedy BF, Noble PB, Sampson DD. Optofluidic needle probe integrating targeted delivery of fluid with optical coherence tomography imaging. OPTICS LETTERS 2014; 39:2888-91. [PMID: 24978229 DOI: 10.1364/ol.39.002888] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We present an optofluidic optical coherence tomography (OCT) needle probe capable of modifying the local optical properties of tissue to improve needle-probe imaging performance. The side-viewing probe comprises an all-fiber-optic design encased in a hypodermic needle (outer diameter 720 μm) and integrates a coaxial fluid-filled channel, terminated by an outlet adjacent to the imaging window, allowing focal injection of fluid to a target tissue. This is the first fully integrated OCT needle probe design to incorporate fluid injection into the imaging mechanism. The utility of this probe is demonstrated in air-filled sheep lungs, where injection of small quantities of saline is shown, by local refractive index matching, to greatly improve image penetration through multiple layers of alveoli. 3D OCT images are correlated against histology, showing improvement in the capability to image lung structures such as bronchioles and blood vessels.
Collapse
|
10
|
Yang X, Lorenser D, McLaughlin RA, Kirk RW, Edmond M, Simpson MC, Grounds MD, Sampson DD. Imaging deep skeletal muscle structure using a high-sensitivity ultrathin side-viewing optical coherence tomography needle probe. BIOMEDICAL OPTICS EXPRESS 2013; 5:136-48. [PMID: 24466482 PMCID: PMC3891326 DOI: 10.1364/boe.5.000136] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Revised: 11/22/2013] [Accepted: 11/30/2013] [Indexed: 05/16/2023]
Abstract
We have developed an extremely miniaturized optical coherence tomography (OCT) needle probe (outer diameter 310 µm) with high sensitivity (108 dB) to enable minimally invasive imaging of cellular structure deep within skeletal muscle. Three-dimensional volumetric images were acquired from ex vivo mouse tissue, examining both healthy and pathological dystrophic muscle. Individual myofibers were visualized as striations in the images. Degradation of cellular structure in necrotic regions was seen as a loss of these striations. Tendon and connective tissue were also visualized. The observed structures were validated against co-registered hematoxylin and eosin (H&E) histology sections. These images of internal cellular structure of skeletal muscle acquired with an OCT needle probe demonstrate the potential of this technique to visualize structure at the microscopic level deep in biological tissue in situ.
Collapse
Affiliation(s)
- Xiaojie Yang
- Optical + Biomedical Engineering Laboratory, School of Electrical, Electronic, and Computer Engineering, The University of Western Australia, Crawley, Australia
| | - Dirk Lorenser
- Optical + Biomedical Engineering Laboratory, School of Electrical, Electronic, and Computer Engineering, The University of Western Australia, Crawley, Australia
| | - Robert A. McLaughlin
- Optical + Biomedical Engineering Laboratory, School of Electrical, Electronic, and Computer Engineering, The University of Western Australia, Crawley, Australia
| | - Rodney W. Kirk
- Optical + Biomedical Engineering Laboratory, School of Electrical, Electronic, and Computer Engineering, The University of Western Australia, Crawley, Australia
| | - Matthew Edmond
- Photon Factory, School of Chemical Sciences & Department of Physics, University of Auckland, Auckland, New Zealand
| | - M. Cather Simpson
- Photon Factory, School of Chemical Sciences & Department of Physics, University of Auckland, Auckland, New Zealand
| | - Miranda D. Grounds
- School of Anatomy, Physiology, and Human Biology, The University of Western Australia
| | - David D. Sampson
- Optical + Biomedical Engineering Laboratory, School of Electrical, Electronic, and Computer Engineering, The University of Western Australia, Crawley, Australia
- Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Crawley, Australia
| |
Collapse
|
11
|
Wang H, Zhu J, Akkin T. Serial optical coherence scanner for large-scale brain imaging at microscopic resolution. Neuroimage 2013; 84:1007-17. [PMID: 24099843 DOI: 10.1016/j.neuroimage.2013.09.063] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2013] [Revised: 08/25/2013] [Accepted: 09/23/2013] [Indexed: 02/01/2023] Open
Abstract
We describe a serial optical coherence scanner (SOCS) for high resolution imaging of ex-vivo brain. SOCS integrates a multi-contrast optical coherence tomography and a vibratome slicer to establish comprehensive brain anatomy and fiber pathways in three-dimensional space. Rat brain images are demonstrated by utilizing intrinsic optical contrasts including back-scattering, birefringence and optic axis orientation, which are simultaneously generated from the same dataset. Volumetric images from serial scans are combined to realize large scale brain maps. Nerve fiber tracts are globally described in 3D by retardance, and delicately delineated by cross-polarization at the resolution of 15×15×5.5μm(3). In-plane orientations of the tracts are quantified by optic axis orientation. SOCS offers a new solution for complete reconstructions of macroscopic tissues such as primate and human brains at microscopic resolution. The technique also opens up varieties of opportunities for connectome studies and systematic investigations on neurological diseases and brain disorders.
Collapse
Affiliation(s)
- Hui Wang
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN, USA
| | | | | |
Collapse
|
12
|
Liang CP, Yang B, Kim IK, Makris G, Desai JP, Gullapalli RP, Chen Y. Concurrent multiscale imaging with magnetic resonance imaging and optical coherence tomography. JOURNAL OF BIOMEDICAL OPTICS 2013; 18:046015. [PMID: 23609326 PMCID: PMC3634554 DOI: 10.1117/1.jbo.18.4.046015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Revised: 03/07/2013] [Accepted: 03/19/2013] [Indexed: 05/23/2023]
Abstract
We develop a novel platform based on a tele-operated robot to perform high-resolution optical coherence tomography (OCT) imaging under continuous large field-of-view magnetic resonance imaging (MRI) guidance. Intra-operative MRI (iMRI) is a promising guidance tool for high-precision surgery, but it may not have sufficient resolution or contrast to visualize certain small targets. To address these limitations, we develop an MRI-compatible OCT needle probe, which is capable of providing microscale tissue architecture in conjunction with macroscale MRI tissue morphology in real time. Coregistered MRI/OCT images on ex vivo chicken breast and human brain tissues demonstrate that the complementary imaging scales and contrast mechanisms have great potential to improve the efficiency and the accuracy of iMRI procedure.
Collapse
Affiliation(s)
- Chia-Pin Liang
- University of Maryland, Fischell Department of Bioengineering, College Park, Maryland 20742
| | - Bo Yang
- University of Maryland, Department of Mechanical Engineering, College Park, Maryland 20742
| | - Il Kyoon Kim
- University of Maryland, Fischell Department of Bioengineering, College Park, Maryland 20742
| | - George Makris
- University of Maryland School of Medicine, Department of Diagnostic Radiology and Nuclear Medicine, Baltimore, Maryland 21201
| | - Jaydev P. Desai
- University of Maryland, Department of Mechanical Engineering, College Park, Maryland 20742
| | - Rao P. Gullapalli
- University of Maryland School of Medicine, Department of Diagnostic Radiology and Nuclear Medicine, Baltimore, Maryland 21201
| | - Yu Chen
- University of Maryland, Fischell Department of Bioengineering, College Park, Maryland 20742
| |
Collapse
|
13
|
Liang CP, Yang B, Kim IK, Makris G, Desai JP, Gullapalli RP, Chen Y. Concurrent multiscale imaging with magnetic resonance imaging and optical coherence tomography. JOURNAL OF BIOMEDICAL OPTICS 2013; 18:046015. [PMID: 23609326 PMCID: PMC3634554 DOI: 10.1117/1.jbo.18.4.040506] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Revised: 03/07/2013] [Accepted: 03/19/2013] [Indexed: 06/02/2023]
Abstract
We develop a novel platform based on a tele-operated robot to perform high-resolution optical coherence tomography (OCT) imaging under continuous large field-of-view magnetic resonance imaging (MRI) guidance. Intra-operative MRI (iMRI) is a promising guidance tool for high-precision surgery, but it may not have sufficient resolution or contrast to visualize certain small targets. To address these limitations, we develop an MRI-compatible OCT needle probe, which is capable of providing microscale tissue architecture in conjunction with macroscale MRI tissue morphology in real time. Coregistered MRI/OCT images on ex vivo chicken breast and human brain tissues demonstrate that the complementary imaging scales and contrast mechanisms have great potential to improve the efficiency and the accuracy of iMRI procedure.
Collapse
Affiliation(s)
- Chia-Pin Liang
- University of Maryland, Fischell Department of Bioengineering, College Park, Maryland 20742
| | - Bo Yang
- University of Maryland, Department of Mechanical Engineering, College Park, Maryland 20742
| | - Il Kyoon Kim
- University of Maryland, Fischell Department of Bioengineering, College Park, Maryland 20742
| | - George Makris
- University of Maryland School of Medicine, Department of Diagnostic Radiology and Nuclear Medicine, Baltimore, Maryland 21201
| | - Jaydev P. Desai
- University of Maryland, Department of Mechanical Engineering, College Park, Maryland 20742
| | - Rao P. Gullapalli
- University of Maryland School of Medicine, Department of Diagnostic Radiology and Nuclear Medicine, Baltimore, Maryland 21201
| | - Yu Chen
- University of Maryland, Fischell Department of Bioengineering, College Park, Maryland 20742
| |
Collapse
|
14
|
Xie Y, Bonin T, Löffler S, Hüttmann G, Tronnier V, Hofmann UG. Coronalin vivoforward-imaging of rat brain morphology with an ultra-small optical coherence tomography fiber probe. Phys Med Biol 2013; 58:555-68. [DOI: 10.1088/0031-9155/58/3/555] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
15
|
Joos KM, Shen JH. Miniature real-time intraoperative forward-imaging optical coherence tomography probe. BIOMEDICAL OPTICS EXPRESS 2013; 4:1342-50. [PMID: 24009997 PMCID: PMC3756577 DOI: 10.1364/boe.4.001342] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Revised: 07/04/2013] [Accepted: 07/08/2013] [Indexed: 05/18/2023]
Abstract
Optical coherence tomography (OCT) has a tremendous global impact upon the ability to diagnose, treat, and monitor eye diseases. A miniature 25-gauge forward-imaging OCT probe with a disposable tip was developed for real-time intraoperative ocular imaging of posterior pole and peripheral structures to improve vitreoretinal surgery. The scanning range was 2 mm when the probe tip was held 3-4 mm from the tissue surface. The axial resolution was 4-6 µm and the lateral resolution was 25-35 µm. The probe was used to image cellophane tape and multiple ocular structures.
Collapse
|
16
|
Huang Y, Liu X, Song C, Kang JU. Motion-compensated hand-held common-path Fourier-domain optical coherence tomography probe for image-guided intervention. BIOMEDICAL OPTICS EXPRESS 2012; 3:3105-18. [PMID: 23243562 PMCID: PMC3521294 DOI: 10.1364/boe.3.003105] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Revised: 10/25/2012] [Accepted: 10/29/2012] [Indexed: 05/04/2023]
Abstract
A motion-compensated, hand-held, common-path, Fourier-domain optical coherence tomography imaging probe has been developed for image-guided intervention during microsurgery. A hand-held prototype instrument was achieved by integrating an imaging fiber probe inside a stainless steel needle and attached to the ceramic shaft of a piezoelectric motor housed in an aluminum handle. The fiber probe obtains A-scan images. The distance information was extracted from the A-scans to track the sample surface distance and a fixed distance was maintained by a feedback motor control which effectively compensated hand tremor and target movements in the axial direction. Real-time data acquisition, processing, motion compensation, and image visualization and saving were implemented on a custom CPU-GPU hybrid architecture. We performed 10× zero padding to the raw spectrum to obtain 0.16 µm position accuracy with a compensation rate of 460 Hz. The root-mean-square error of hand-held distance variation from target position was measured to be 2.93 µm. We used a cross-correlation maximization-based shift correction algorithm for topology correction. To validate the system, we performed free-hand OCT M-scan imaging using various samples.
Collapse
|
17
|
Kang JU, Huang Y, Zhang K, Ibrahim Z, Cha J, Lee WPA, Brandacher G, Gehlbach PL. Real-time three-dimensional Fourier-domain optical coherence tomography video image guided microsurgeries. JOURNAL OF BIOMEDICAL OPTICS 2012; 17:081403-1. [PMID: 23224164 PMCID: PMC3381017 DOI: 10.1117/1.jbo.17.8.081403] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2011] [Revised: 03/03/2012] [Accepted: 03/12/2012] [Indexed: 05/20/2023]
Abstract
The authors describe the development of an ultrafast three-dimensional (3D) optical coherence tomography (OCT) imaging system that provides real-time intraoperative video images of the surgical site to assist surgeons during microsurgical procedures. This system is based on a full-range complex conjugate free Fourier-domain OCT (FD-OCT). The system was built in a CPU-GPU heterogeneous computing architecture capable of video OCT image processing. The system displays at a maximum speed of 10 volume/s for an image volume size of 160 × 80 × 1024(X × Y × Z) pixels. We have used this system to visualize and guide two prototypical microsurgical maneuvers: microvascular anastomosis of the rat femoral artery and ultramicrovascular isolation of the retinal arterioles of the bovine retina. Our preliminary experiments using 3D-OCT-guided microvascular anastomosis showed optimal visualization of the rat femoral artery (diameter<0.8 mm), instruments, and suture material. Real-time intraoperative guidance helped facilitate precise suture placement due to optimized views of the vessel wall during anastomosis. Using the bovine retina as a model system, we have performed "ultra microvascular" feasibility studies by guiding handheld surgical micro-instruments to isolate retinal arterioles (diameter ~0.1 mm). Isolation of the microvessels was confirmed by successfully passing a suture beneath the vessel in the 3D imaging environment.
Collapse
Affiliation(s)
- Jin U Kang
- Johns Hopkins University, Department of Electrical and Computer Engineering, 3400 N. Charles Street, Baltimore, MD 21218, USA.
| | | | | | | | | | | | | | | |
Collapse
|
18
|
Sato M, Nomura D, Kitano T, Tsunenari T, Nishidate I. Variations in signal intensity with periodical temperature changes in vivo in rat brain: analysis using wide-field optical coherence tomography. APPLIED OPTICS 2012; 51:1436-45. [PMID: 22505060 DOI: 10.1364/ao.51.001436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
In a previous study, we reported measurements of three-dimensional (3D) optical coherence tomography (OCT) images through a thinned skull by reducing temperatures from 28 °C to 18 °C in vivo in the rat brain to show negative correlation coefficients (CCs) between ratios of signal intensity (RSI) and temperature for applications to monitoring brain viability. In this study, using the same OCT system, we measured 3D OCT images of the rat brain by periodically changing tissue temperatures from 20 °C to 32 °C in vivo. In the evaluation of CCs among RSI, temperature, and heart rate, the largest number of periods was four, and the longest measurement time was 570 min. Averaged CCs between RSI and temperature, and between RSI and heart rate, were -0.42 to -0.50 and -0.48 to -0.64, respectively. RSI reversibly changed subsequent variations of temperatures and finally increased rapidly just before cardiac arrest. These results indicate that RSI could correspond to decreases in viability because of local ischemia and recovery.
Collapse
Affiliation(s)
- Manabu Sato
- Graduate School of Science and Engineering, Yamagata University, Yonezawa, Yamagata, Japan.
| | | | | | | | | |
Collapse
|
19
|
Liang CP, Wierwille J, Moreira T, Schwartzbauer G, Jafri MS, Tang CM, Chen Y. A forward-imaging needle-type OCT probe for image guided stereotactic procedures. OPTICS EXPRESS 2011; 19:26283-94. [PMID: 22274213 PMCID: PMC3297117 DOI: 10.1364/oe.19.026283] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
A forward-imaging needle-type optical coherence tomography (OCT) probe with Doppler OCT (DOCT) capability has the potential to solve critical challenges in interventional procedures. A case in point is stereotactic neurosurgery where probes are advanced into the brain based on predetermined coordinates. Laceration of blood vessels in front of the advancing probe is an unavoidable complication with current methods. Moreover, cerebrospinal fluid (CSF) leakage during surgery can shift the brain rendering the predetermined coordinates unreliable. In order to address these challenges, we developed a forward-imaging OCT probe (740 μm O.D.) using a gradient-index (GRIN) rod lens that can provide real-time imaging feedback for avoiding at-risk vessels (8 frames/s with 1024 A-scans per frame for OCT/DOCT dual imaging) and guiding the instrument to specific targets with 12 μm axial resolution (100 frames/s with 160 A-scans per frame for OCT imaging only). The high signal-to-background characteristic of DOCT provides exceptional sensitivity in detecting and quantifying the blood flow within the sheep brain parenchyma in real time. The OCT/DOCT dual imaging also demonstrated its capability to differentiate the vessel type (artery/vein) on rat's femoral vessels. We also demonstrated in ex vivo human brain that the location of the tip of the OCT probe can be inferred from micro-anatomical landmarks in OCT images. These findings demonstrate the suitability of OCT guidance during stereotactic procedures in the brain and its potential for reducing the risk of cerebral hemorrhage.
Collapse
Affiliation(s)
- Chia-Pin Liang
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742
USA
| | - Jeremiah Wierwille
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742
USA
| | - Thais Moreira
- Department of Neurology, University of Maryland School of Medicine, Baltimore, MD 21201
USA
- Research Service, Baltimore VA Medical Center, Baltimore, MD 21201
USA
| | - Gary Schwartzbauer
- Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, MD 21201
USA
| | - M. Samir Jafri
- Department of Neurology, University of Maryland School of Medicine, Baltimore, MD 21201
USA
- Research Service, Baltimore VA Medical Center, Baltimore, MD 21201
USA
| | - Cha-Min Tang
- Department of Neurology, University of Maryland School of Medicine, Baltimore, MD 21201
USA
- Research Service, Baltimore VA Medical Center, Baltimore, MD 21201
USA
| | - Yu Chen
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742
USA
| |
Collapse
|
20
|
Watanabe H, Rajagopalan UM, Nakamichi Y, Igarashi KM, Madjarova VD, Kadono H, Tanifuji M. In vivo layer visualization of rat olfactory bulb by a swept source optical coherence tomography and its confirmation through electrocoagulation and anatomy. BIOMEDICAL OPTICS EXPRESS 2011; 2:2279-87. [PMID: 21833364 PMCID: PMC3149525 DOI: 10.1364/boe.2.002279] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2011] [Revised: 07/13/2011] [Accepted: 07/13/2011] [Indexed: 05/15/2023]
Abstract
Here, we report in vivo 3-D visualization of the layered organization of a rat olfactory bulb (OB) by a swept source optical coherence tomography (SS-OCT). The SS-OCT operates at a wavelength of 1334 nm with respective theoretical depth and lateral resolutions of 6.7 μm and 15.4 μm in air and hence it is possible to get a 3D structural map of OB in vivo at the micron level resolution with millimeter-scale imaging depth. Up until now, with methods such as MRI, confocal microscopy, OB depth structure in vivo had not been clearly visualized as these do not satisfy the criterion of simultaneously providing micron-scale spatial resolution and imaging up to a few millimeter in depth. In order to confirm the OB's layered organization revealed by SS-OCT, we introduced the technique of electrocoagulation to make landmarks across the layered structure. To our knowledge this is such a first study that combines electrocoagulation and OCT in vivo of rat OB. Our results confirmed the layered organization of OB, and moreover the layers were clearly identified by electrocoagulation landmarks both in the OCT structural and anatomical slice images. We expect such a combined study is beneficial for both OCT and neuroscience fields.
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
| | - Violeta Dimitrova Madjarova
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama-city, Saitama, 338-08570, 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
|
21
|
Wang H, Black AJ, Zhu J, Stigen TW, Al-Qaisi MK, Netoff TI, Abosch A, Akkin T. Reconstructing micrometer-scale fiber pathways in the brain: multi-contrast optical coherence tomography based tractography. Neuroimage 2011; 58:984-92. [PMID: 21771662 DOI: 10.1016/j.neuroimage.2011.07.005] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2011] [Revised: 06/15/2011] [Accepted: 07/04/2011] [Indexed: 11/30/2022] Open
Abstract
Comprehensive understanding of connective neural pathways in the brain has put great challenges on the current imaging techniques, for which three-dimensional (3D) visualization of fiber tracts with high spatiotemporal resolution is desirable. Here we present optical imaging and tractography of rat brain ex-vivo using multi-contrast optical coherence tomography (MC-OCT), which is capable of simultaneously generating depth-resolved images of reflectivity, phase retardance, optic axis orientation and, for in-vivo studies, blood flow images. Using the birefringence property of myelin sheath, nerve fiber tracts as small as a few tens of micrometers can be resolved and neighboring fiber tracts with different orientations can be distinguished in cross-sectional optical slices, 2D en-face images and 3D volumetric images. Combinational contrast of MC-OCT images enables visualization of the spatial architecture and nerve fiber orientations in the brain with unprecedented detail. The results suggest that optical tractography, by virtue of its direct accessibility to nerve fibers, has the potential to validate diffusion magnetic resonance images and investigate structural connections in normal brain and neurological disorders. In addition, an endoscopic MC-OCT may be useful in neurosurgical interventions to aid in placement of deep brain stimulating electrodes.
Collapse
Affiliation(s)
- Hui Wang
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN, USA
| | | | | | | | | | | | | | | |
Collapse
|
22
|
Lee SJ, Sun J, Flint JJ, Guo S, Xie HK, King MA, Sarntinoranont M. Optically based-indentation technique for acute rat brain tissue slices and thin biomaterials. J Biomed Mater Res B Appl Biomater 2011; 97:84-95. [PMID: 21290586 DOI: 10.1002/jbm.b.31789] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2010] [Revised: 10/19/2010] [Accepted: 10/20/2010] [Indexed: 11/07/2022]
Abstract
Currently, micro-indentation testing of soft biological materials is limited in its capability to test over long time scales due to accumulated instrumental drift errors. As a result, there is a paucity of measures for mechanical properties such as the equilibrium modulus. In this study, indentation combined with optical coherence tomography (OCT) was used for mechanical testing of thin tissue slices. OCT was used to measure the surface deformation profiles after placing spherical beads onto submerged test samples. Agarose-based hydrogels at low-concentrations (w/v, 0.3-0.6%) and acute rat brain tissue slices were tested using this technique over a 30-min time window. To establish that tissue slices maintained cell viability, allowable testing times were determined by measuring neuronal death or degeneration as a function of incubation time with Fluor-Jade C (FJC) staining. Since large deformations at equilibrium were measured, displacements of surface beads were compared with finite element elastic contact simulations to predict the equilibrium modulus, μ(∞) . Values of μ(∞) for the low-concentration hydrogels ranged from 0.07 to 1.8 kPa, and μ(∞) for acute rat brain tissue slices was 0.13 ± 0.04 kPa for the cortex and 0.09 ± 0.015 kPa for the hippocampus (for Poisson ratio = 0.35). This indentation technique offers a localized, real-time, and high resolution method for long-time scale mechanical testing of very soft materials. This test method may also be adapted for viscoelasticity, for testing of different tissues and biomaterials, and for analyzing changes in internal structures with loading.
Collapse
Affiliation(s)
- S J Lee
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida, USA
| | | | | | | | | | | | | |
Collapse
|
23
|
Zhang K, Kang JU. Graphics processing unit accelerated non-uniform fast Fourier transform for ultrahigh-speed, real-time Fourier-domain OCT. OPTICS EXPRESS 2010; 18:23472-87. [PMID: 21164690 PMCID: PMC3358119 DOI: 10.1364/oe.18.023472] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2010] [Revised: 10/14/2010] [Accepted: 10/15/2010] [Indexed: 05/20/2023]
Abstract
We implemented fast Gaussian gridding (FGG)-based non-uniform fast Fourier transform (NUFFT) on the graphics processing unit (GPU) architecture for ultrahigh-speed, real-time Fourier-domain optical coherence tomography (FD-OCT). The Vandermonde matrix-based non-uniform discrete Fourier transform (NUDFT) as well as the linear/cubic interpolation with fast Fourier transform (InFFT) methods are also implemented on GPU to compare their performance in terms of image quality and processing speed. The GPU accelerated InFFT/NUDFT/NUFFT methods are applied to process both the standard half-range FD-OCT and complex full-range FD-OCT (C-FD-OCT). GPU-NUFFT provides an accurate approximation to GPU-NUDFT in terms of image quality, but offers >10 times higher processing speed. Compared with the GPU-InFFT methods, GPU-NUFFT has improved sensitivity roll-off, higher local signal-to-noise ratio and immunity to side-lobe artifacts caused by the interpolation error. Using a high speed CMOS line-scan camera, we demonstrated the real-time processing and display of GPU-NUFFT-based C-FD-OCT at a camera-limited rate of 122 k line/s (1024 pixel/A-scan).
Collapse
Affiliation(s)
- Kang Zhang
- Department of Electrical and Computer Engineering, The Johns Hopkins University, 3400 N. Charles St., Baltimore, Maryland 21218, USA.
| | | |
Collapse
|
24
|
Kang JU, Han JH, Liu X, Zhang K. Common-Path Optical Coherence Tomography for Biomedical Imaging and Sensing. ACTA ACUST UNITED AC 2010; 14:1-13. [PMID: 20657808 DOI: 10.3807/josk.2010.14.1.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This paper describes a development of a fiber optic common-path optical coherence tomography (OCT) based imaging and guided system that possess ability to reliably identify optically transparent targets that are on the micron scale; ability to maintain a precise and safe position from the target; ability to provide spectroscopic imaging; ability to imaging biological target in 3-D. The system is based on a high resolution fiber optic Common-Path OCT (CP-OCT) that can be integrated into various mini-probes and tools. The system is capable of obtaining >70K A-scan per second with a resolution better than 3 μm. We have demonstrated that the system is capable of one-dimensional real-time depth tracking, tool motion limiting and motion compensation, oxygen-saturation level imaging, and high resolution 3-D images for various biomedical applications.
Collapse
Affiliation(s)
- Jin U Kang
- Department of Electrical and Computer Engineering, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA
| | | | | | | |
Collapse
|
25
|
Zhang K, Wang W, Han J, Kang JU. A surface topology and motion compensation system for microsurgery guidance and intervention based on common-path optical coherence tomography. IEEE Trans Biomed Eng 2009; 56:2318-21. [PMID: 19497807 DOI: 10.1109/tbme.2009.2024077] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A surface topology and motion compensation system for microsurgery guidance and intervention is developed based on common-path optical coherence tomography. A 1-D erosion-based edge-searching method and autoregressive predictor are applied to A-scan data for real-time depth tracking. Images using the topology and motion compensation technique are obtained. In addition, the motion compensation properties are studied. The system can be easily integrated with microsurgery tools and can be used for various clinical applications.
Collapse
Affiliation(s)
- Kang Zhang
- Department of Electrical and Computer Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA.
| | | | | | | |
Collapse
|