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Mohtasebi M, Singh D, Liu X, Fathi F, Haratbar SR, Saatman KE, Chen L, Yu G. Depth-sensitive diffuse speckle contrast topography for high-density mapping of cerebral blood flow in rodents. NEUROPHOTONICS 2023; 10:045007. [PMID: 38076725 PMCID: PMC10704187 DOI: 10.1117/1.nph.10.4.045007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 10/26/2023] [Accepted: 10/27/2023] [Indexed: 02/12/2024]
Abstract
Significance Frequent assessment of cerebral blood flow (CBF) is crucial for the diagnosis and management of cerebral vascular diseases. In contrast to large and expensive imaging modalities, such as nuclear medicine and magnetic resonance imaging, optical imaging techniques are portable and inexpensive tools for continuous measurements of cerebral hemodynamics. The recent development of an innovative noncontact speckle contrast diffuse correlation tomography (scDCT) enables three-dimensional (3D) imaging of CBF distributions. However, scDCT requires complex and time-consuming 3D reconstruction, which limits its ability to achieve high spatial resolution without sacrificing temporal resolution and computational efficiency. Aim We investigate a new diffuse speckle contrast topography (DSCT) method with parallel computation for analyzing scDCT data to achieve fast and high-density two-dimensional (2D) mapping of CBF distributions at different depths without the need for 3D reconstruction. Approach A new moving window method was adapted to improve the sampling rate of DSCT. A fast computation method utilizing MATLAB functions in the Image Processing Toolbox™ and Parallel Computing Toolbox™ was developed to rapidly generate high-density CBF maps. The new DSCT method was tested for spatial resolution and depth sensitivity in head-simulating layered phantoms and in-vivo rodent models. Results DSCT enables 2D mapping of the particle flow in the phantom at different depths through the top layer with varied thicknesses. Both DSCT and scDCT enable the detection of global and regional CBF changes in deep brains of adult rats. However, DSCT achieves fast and high-density 2D mapping of CBF distributions at different depths without the need for complex and time-consuming 3D reconstruction. Conclusions The depth-sensitive DSCT method has the potential to be used as a noninvasive, noncontact, fast, high resolution, portable, and inexpensive brain imager for basic neuroscience research in small animal models and for translational studies in human neonates.
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Affiliation(s)
- Mehrana Mohtasebi
- University of Kentucky, Department of Biomedical Engineering, Lexington, Kentucky, United States
| | - Dara Singh
- University of Kentucky, Department of Biomedical Engineering, Lexington, Kentucky, United States
| | - Xuhui Liu
- University of Kentucky, Department of Biomedical Engineering, Lexington, Kentucky, United States
| | - Faraneh Fathi
- University of Kentucky, Department of Biomedical Engineering, Lexington, Kentucky, United States
| | | | - Kathryn E. Saatman
- University of Kentucky, Spinal Cord and Brain Injury Research Center, Department of Physiology, Lexington, Kentucky, United States
| | - Lei Chen
- University of Kentucky, Spinal Cord and Brain Injury Research Center, Department of Physiology, Lexington, Kentucky, United States
| | - Guoqiang Yu
- University of Kentucky, Department of Biomedical Engineering, Lexington, Kentucky, United States
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Zhao M, Huang C, Mazdeyasna S, Yu G. Extraction of tissue optical property and blood flow from speckle contrast diffuse correlation tomography (scDCT) measurements. BIOMEDICAL OPTICS EXPRESS 2021; 12:5894-5908. [PMID: 34692223 PMCID: PMC8515985 DOI: 10.1364/boe.429890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 07/15/2021] [Accepted: 08/17/2021] [Indexed: 06/13/2023]
Abstract
Measurement of blood flow in tissue provides vital information for the diagnosis and therapeutic monitoring of various vascular diseases. A noncontact, camera-based, near-infrared speckle contrast diffuse correlation tomography (scDCT) technique has been recently developed for 3D imaging of blood flow index (αDB) distributions in deep tissues up to a centimeter. A limitation with the continuous-wave scDCT measurement of blood flow is the assumption of constant and homogenous tissue absorption coefficient (μ a ). The present study took the advantage of rapid, high-density, noncontact scDCT measurements of both light intensities and diffuse speckle contrast at multiple source-detector distances and developed two-step fitting algorithms for extracting both μ a and αDB. The new algorithms were tested in tissue-simulating phantoms with known optical properties and human forearms. Measurement results were compared against established near-infrared spectroscopy (NIRS) and diffuse correlation spectroscopy (DCS) techniques. The accuracies of our new fitting algorithms with scDCT measurements in phantoms (up to 16% errors) and forearms (up to 23% errors) are comparable to relevant study results (up to 25% errors). Knowledge of μ a not only improved the accuracy in calculating αDB but also provided the potential for quantifying tissue blood oxygenation via spectral measurements. A multiple-wavelength scDCT system with new algorithms is currently developing to fit multi-wavelength and multi-distance data for 3D imaging of both blood flow and oxygenation distributions in deep tissues.
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Recent Developments in Instrumentation of Functional Near-Infrared Spectroscopy Systems. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10186522] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
In the last three decades, the development and steady improvement of various optical technologies at the near-infrared region of the electromagnetic spectrum has inspired a large number of scientists around the world to design and develop functional near-infrared spectroscopy (fNIRS) systems for various medical applications. This has been driven further by the availability of new sources and detectors that support very compact and wearable system designs. In this article, we review fNIRS systems from the instrumentation point of view, discussing the associated challenges and state-of-the-art approaches. In the beginning, the fundamentals of fNIRS systems as well as light-tissue interaction at NIR are briefly introduced. After that, we present the basics of NIR systems instrumentation. Next, the recent development of continuous-wave, frequency-domain, and time-domain fNIRS systems are discussed. Finally, we provide a summary of these three modalities and an outlook into the future of fNIRS technology.
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Huang C, Mazdeyasna S, Chen L, Abu Jawdeh EG, Bada HS, Saatman KE, Chen L, Yu G. Noninvasive noncontact speckle contrast diffuse correlation tomography of cerebral blood flow in rats. Neuroimage 2019; 198:160-169. [DOI: 10.1016/j.neuroimage.2019.05.047] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 05/16/2019] [Accepted: 05/17/2019] [Indexed: 01/05/2023] Open
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Bortfeld H. Functional near-infrared spectroscopy as a tool for assessing speech and spoken language processing in pediatric and adult cochlear implant users. Dev Psychobiol 2018; 61:430-443. [PMID: 30588618 DOI: 10.1002/dev.21818] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 11/04/2018] [Accepted: 11/16/2018] [Indexed: 11/11/2022]
Abstract
Much of what is known about the course of auditory learning in following cochlear implantation is based on behavioral indicators that users are able to perceive sound. Both prelingually deafened children and postlingually deafened adults who receive cochlear implants display highly variable speech and language processing outcomes, although the basis for this is poorly understood. To date, measuring neural activity within the auditory cortex of implant recipients of all ages has been challenging, primarily because the use of traditional neuroimaging techniques is limited by the implant itself. Functional near-infrared spectroscopy (fNIRS) is an imaging technology that works with implant users of all ages because it is non-invasive, compatible with implant devices, and not subject to electrical artifacts. Thus, fNIRS can provide insight into processing factors that contribute to variations in spoken language outcomes in implant users, both children and adults. There are important considerations to be made when using fNIRS, particularly with children, to maximize the signal-to-noise ratio and to best identify and interpret cortical responses. This review considers these issues, recent data, and future directions for using fNIRS as a tool to understand spoken language processing in children and adults who hear through a cochlear implant.
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Affiliation(s)
- Heather Bortfeld
- Psychological Sciences, University of California, Merced, Merced, California
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Abstract
Active infrared (IR) thermographic nondestructive testing (NDT) has become a valuable inspection method for composite materials due to its high sensitivity to particular types of defect and high inspection rate. The computer-implemented thermal tomography, based on the analysis of heat diffusion in solids, involves a specialized treatment of the data obtained by means of active IR thermographic NDT, thus allowing for the “slicing” of materials under testing for a few layers where discontinuity-like defects can be underlined on the noise-free background (binary thermal tomograms). The time-domain thermal tomography is based on the fact that, in a one-sided test, temperature “footprints” of deeper defects appear later in regard to shallower defects. The phase-domain tomography can be applied to collected IR data in a direct way, for instance, by using the Fourier transform, but quantification of results is more difficult because the relationships between phase and defect depth depend on experimental parameters, and the corresponding “phase vs. defect depth” calibration functions are ambiguous. In this study, the time- and phase-domain thermal tomography techniques have been compared on simulated IR thermograms and experimentally applied to the evaluation of carbon fiber reinforced plastic composite containing impact damage defects characterized by impact energy 10, 18, and 63 J. Both tomographic techniques have demonstrated similar results in the reconstruction of thermal tomograms and, in some cases, supplied complementary information about the distribution of single defect zones within impacted areas.
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Chen W, Wang X, Wang B, Wang Y, Zhang Y, Zhao H, Gao F. Lock-in-photon-counting-based highly-sensitive and large-dynamic imaging system for continuous-wave diffuse optical tomography. BIOMEDICAL OPTICS EXPRESS 2016; 7:499-511. [PMID: 26977358 PMCID: PMC4771467 DOI: 10.1364/boe.7.000499] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 12/21/2015] [Accepted: 01/13/2016] [Indexed: 05/25/2023]
Abstract
We implemented a novel lock-in photon-counting detection architecture that combines the ultra-high sensitivity of the photon-counting detection and the measurement parallelism of the lock-in technique. Based on this technique, a dual-wavelength simultaneous measurement continuous wave diffuse optical tomography system was developed with a configuration of 16 sources and 16 detectors that works in a tandem serial-to-parallel fashion. Methodology validation and performance assessment of the system were conducted using phantom experiments that demonstrate excellent measurement linearity, moderate-term system stability, robustness to noise and negligible inter-wavelength crosstalk. 2-D imaging experiments further validate high sensitivity of the lock-in photon-counting methodology as well as high reliability of the proposed system. The advanced detection principle can be adapted to achieving a fully parallelized instrumentation for the extended applications.
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Affiliation(s)
- Weiting Chen
- Collage of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
| | - Xin Wang
- Collage of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
| | - Bingyuan Wang
- Collage of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
| | - Yihan Wang
- Collage of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
| | - Yanqi Zhang
- Collage of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
| | - Huijuan Zhao
- Collage of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
- Tianjin Key Laboratory of Biomedical Detecting Techniques and Instruments, Tianjin 300072, China
| | - Feng Gao
- Collage of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
- Tianjin Key Laboratory of Biomedical Detecting Techniques and Instruments, Tianjin 300072, China
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Jermyn M, Gosselin Y, Valdes PA, Sibai M, Kolste K, Mercier J, Angulo L, Roberts DW, Paulsen KD, Petrecca K, Daigle O, Wilson BC, Leblond F. Improved sensitivity to fluorescence for cancer detection in wide-field image-guided neurosurgery. BIOMEDICAL OPTICS EXPRESS 2015; 6:5063-74. [PMID: 26713218 PMCID: PMC4679278 DOI: 10.1364/boe.6.005063] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Revised: 11/11/2015] [Accepted: 11/16/2015] [Indexed: 05/19/2023]
Abstract
In glioma surgery, Protoporphyrin IX (PpIX) fluorescence may identify residual tumor that could be resected while minimizing damage to normal brain. We demonstrate that improved sensitivity for wide-field spectroscopic fluorescence imaging is achieved with minimal disruption to the neurosurgical workflow using an electron-multiplying charge-coupled device (EMCCD) relative to a state-of-the-art CMOS system. In phantom experiments the EMCCD system can detect at least two orders-of-magnitude lower PpIX. Ex vivo tissue imaging on a rat glioma model demonstrates improved fluorescence contrast compared with neurosurgical fluorescence microscope technology, and the fluorescence detection is confirmed with measurements from a clinically-validated spectroscopic probe. Greater PpIX sensitivity in wide-field fluorescence imaging may improve the residual tumor detection during surgery with consequent impact on survival.
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Affiliation(s)
- Michael Jermyn
- Brain Tumour Research Centre, Montreal Neurological Institute and Hospital, Dept. Neurology and Neurosurgery, McGill University, 3801 University St., Montreal, QC, H3A 2B4,
Canada
- Dept. Engineering Physics, Polytechnique Montreal, CP 6079, Succ. Centre-Ville, Montreal, QC, H3C 3A7,
Canada
| | - Yoann Gosselin
- Dept. Engineering Physics, Polytechnique Montreal, CP 6079, Succ. Centre-Ville, Montreal, QC, H3C 3A7,
Canada
| | - Pablo A. Valdes
- Dept. Neurosurgery, Harvard Medical School, Brigham and Women’s Hospital, 75 Francis Street, Boston, MA 02115,
USA
| | - Mira Sibai
- Dept. Medical Biophysics, University of Toronto/University Health Network, Toronto, ON, M5G 1L7,
Canada
| | - Kolbein Kolste
- Thaver School of Engineering, Dartmouth College, 14 Engineering Drive, Hanover, NH 03755,
USA
| | - Jeanne Mercier
- Dept. Engineering Physics, Polytechnique Montreal, CP 6079, Succ. Centre-Ville, Montreal, QC, H3C 3A7,
Canada
| | - Leticia Angulo
- Dept. Engineering Physics, Polytechnique Montreal, CP 6079, Succ. Centre-Ville, Montreal, QC, H3C 3A7,
Canada
| | - David W. Roberts
- Dept. Neurosurgery, Dartmouth Hitchcock Medical Center, One Medical Center Drive, Lebanon, NH 03756,
USA
| | - Keith D. Paulsen
- Thaver School of Engineering, Dartmouth College, 14 Engineering Drive, Hanover, NH 03755,
USA
| | - Kevin Petrecca
- Brain Tumour Research Centre, Montreal Neurological Institute and Hospital, Dept. Neurology and Neurosurgery, McGill University, 3801 University St., Montreal, QC, H3A 2B4,
Canada
| | - Olivier Daigle
- Nuvu cameras, 5155 Decelles avenue, Pavillon JA Bombardier, Montreal, QC, H3T 2B1,
Canada
| | - Brian C. Wilson
- Dept. Medical Biophysics, University of Toronto/University Health Network, Toronto, ON, M5G 1L7,
Canada
| | - Frederic Leblond
- Dept. Engineering Physics, Polytechnique Montreal, CP 6079, Succ. Centre-Ville, Montreal, QC, H3C 3A7,
Canada
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal, rue Saint-Denis, Que, H2X 0A9,
Canada
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Yuan G, Alqasemi U, Chen A, Yang Y, Zhu Q. Light-emitting diode-based multiwavelength diffuse optical tomography system guided by ultrasound. JOURNAL OF BIOMEDICAL OPTICS 2014; 19:126003. [PMID: 25473884 PMCID: PMC4255433 DOI: 10.1117/1.jbo.19.12.126003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Accepted: 10/29/2014] [Indexed: 06/04/2023]
Abstract
Laser diodes are widely used in diffuse optical tomography (DOT) systems but are typically expensive and fragile, while light-emitting diodes (LEDs) are cheaper and are also available in the near-infrared (NIR) range with adequate output power for imaging deeply seated targets. In this study, we introduce a new low-cost DOT system using LEDs of four wavelengths in the NIR spectrum as light sources. The LEDs were modulated at 20 kHz to avoid ambient light. The LEDs were distributed on a hand-held probe and a printed circuit board was mounted at the back of the probe to separately provide switching and driving current to each LED. Ten optical fibers were used to couple the reflected light to 10 parallel photomultiplier tube detectors. A commercial ultrasound system provided simultaneous images of target location and size to guide the image reconstruction. A frequency-domain (FD) laser-diode-based system with ultrasound guidance was also used to compare the results obtained from those of the LED-based system. Results of absorbers embedded in intralipid and inhomogeneous tissue phantoms have demonstrated that the LED-based system provides a comparable quantification accuracy of targets to the FD system and has the potential to image deep targets such as breast lesions.
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Affiliation(s)
- Guangqian Yuan
- University of Connecticut, Biomedical Engineering Department, 260 Glenbrook Road; U-3247, Storrs, Connecticut 06269-3247, United States
| | - Umar Alqasemi
- University of Connecticut, Biomedical Engineering Department, 260 Glenbrook Road; U-3247, Storrs, Connecticut 06269-3247, United States
| | - Aaron Chen
- University of Pennsylvania, College of Art and Sciences, 249 South 36th Street, Philadelphia 19104-6304, United States
| | - Yi Yang
- University of Connecticut, Departments of Electrical and Computer Engineering, 371 Fairfield Way; U-4157, Storrs, Connecticut 06269-4157, United States
| | - Quing Zhu
- University of Connecticut, Biomedical Engineering Department, 260 Glenbrook Road; U-3247, Storrs, Connecticut 06269-3247, United States
- University of Pennsylvania, College of Art and Sciences, 249 South 36th Street, Philadelphia 19104-6304, United States
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