301
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Ferradal SL, Liao SM, Eggebrecht AT, Shimony JS, Inder TE, Culver JP, Smyser CD. Functional Imaging of the Developing Brain at the Bedside Using Diffuse Optical Tomography. Cereb Cortex 2015; 26:1558-68. [PMID: 25595183 DOI: 10.1093/cercor/bhu320] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
While histological studies and conventional magnetic resonance imaging (MRI) investigations have elucidated the trajectory of structural changes in the developing brain, less is known regarding early functional cerebral development. Recent investigations have demonstrated that resting-state functional connectivity MRI (fcMRI) can identify networks of functional cerebral connections in infants. However, technical and logistical challenges frequently limit the ability to perform MRI scans early or repeatedly in neonates, particularly in those at greatest risk for adverse neurodevelopmental outcomes. High-density diffuse optical tomography (HD-DOT), a portable imaging modality, potentially enables early continuous and quantitative monitoring of brain function in infants. We introduce an HD-DOT imaging system that combines advancements in cap design, ergonomics, and data analysis methods to allow bedside mapping of functional brain development in infants. In a cohort of healthy, full-term neonates scanned within the first days of life, HD-DOT results demonstrate strong congruence with those obtained using co-registered, subject-matched fcMRI and reflect patterns of typical brain development. These findings represent a transformative advance in functional neuroimaging in infants, and introduce HD-DOT as a powerful and practical method for quantitative mapping of early functional brain development in normal and high-risk neonates.
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Affiliation(s)
- Silvina L Ferradal
- Department of Biomedical Engineering, Washington University, St Louis, MO, USA Mallinckrodt Institute of Radiology, Washington University School of Medicine, St Louis, MO, USA
| | - Steve M Liao
- Department of Pediatrics, Washington University School of Medicine, St Louis, MO, USA
| | - Adam T Eggebrecht
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, St Louis, MO, USA
| | - Joshua S Shimony
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, St Louis, MO, USA
| | - Terrie E Inder
- Department of Pediatric Newborn Medicine, Brigham and Women's Hospital, Boston, MA, USA
| | - Joseph P Culver
- Department of Biomedical Engineering, Washington University, St Louis, MO, USA Mallinckrodt Institute of Radiology, Washington University School of Medicine, St Louis, MO, USA
| | - Christopher D Smyser
- Department of Pediatrics, Washington University School of Medicine, St Louis, MO, USA Department of Neurology, Washington University School of Medicine, St Louis, MO, USA
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302
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Chiarelli AM, Maclin EL, Low KA, Fabiani M, Gratton G. Comparison of procedures for co-registering scalp-recording locations to anatomical magnetic resonance images. JOURNAL OF BIOMEDICAL OPTICS 2015; 20:016009. [PMID: 25574993 PMCID: PMC4288136 DOI: 10.1117/1.jbo.20.1.016009] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 12/01/2014] [Indexed: 05/09/2023]
Abstract
Functional brain imaging techniques require accurate co-registration to anatomical images to precisely identify the areas being activated. Many of them, including diffuse optical imaging, rely on scalp-placed recording sensors. Fiducial alignment is an effective and rapid method for co-registering scalp sensors onto anatomy, but is quite sensitive to placement errors. Surface Euclidean distance minimization using the Levenberq-Marquart algorithm (LMA) has been shown to be very accurate when based on good initial guesses, such as precise fiducial alignment, but its accuracy drops substantially with fiducial placement errors. Here we compared fiducial and LMA co-registration methods to a new procedure, the iterative closest point-to-plane (ICP2P) method, using simulated and real data. An advantage of ICP2P is that it eliminates the need to identify fiducials and is, therefore, entirely automatic. We show that, typically, ICP2P is as accurate as fiducial-based LMA, but is less sensitive to initial placement errors. However, ICP2P is more sensitive to spatially correlated noise in the description of the head surface. Hence, the best technique for co-registration depends on the type of data available to describe the scalp and the surface defined by the recording sensors. Under optimal conditions, co-registration error using surface-fitting procedures can be reduced to ~ 3 mm.
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Affiliation(s)
- Antonio M. Chiarelli
- University of Illinois, Beckman Institute, 405 North Mathews Avenue, Urbana, Illinois 61801, United States
| | - Edward L. Maclin
- University of Illinois, Beckman Institute, 405 North Mathews Avenue, Urbana, Illinois 61801, United States
| | - Kathy A. Low
- University of Illinois, Beckman Institute, 405 North Mathews Avenue, Urbana, Illinois 61801, United States
| | - Monica Fabiani
- University of Illinois, Beckman Institute, 405 North Mathews Avenue, Urbana, Illinois 61801, United States
- University of Illinois, Psychology Department, 405 North Mathews Avenue, Urbana, Illinois 61801, United States
| | - Gabriele Gratton
- University of Illinois, Beckman Institute, 405 North Mathews Avenue, Urbana, Illinois 61801, United States
- University of Illinois, Psychology Department, 405 North Mathews Avenue, Urbana, Illinois 61801, United States
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303
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Puszka A, Di Sieno L, Mora AD, Pifferi A, Contini D, Planat-Chrétien A, Koenig A, Boso G, Tosi A, Hervé L, Dinten JM. Spatial resolution in depth for time-resolved diffuse optical tomography using short source-detector separations. BIOMEDICAL OPTICS EXPRESS 2015; 6:1-10. [PMID: 25657869 PMCID: PMC4317114 DOI: 10.1364/boe.6.000001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Revised: 11/07/2014] [Accepted: 11/07/2014] [Indexed: 05/20/2023]
Abstract
Diffuse optical tomography for medical applications can require probes with small dimensions involving short source-detector separations. Even though this configuration is seen at first as a constraint due to the challenge of depth sensitivity, we show here that it can potentially be an asset for spatial resolution in depth. By comparing two fiber optic probes on a test object, we first show with simulations that short source-detector separations improve the spatial resolution down to a limit depth. We then confirm these results in an experimental study with a state-of-the-art setup involving a fast-gated single-photon avalanche diode allowing maximum depth sensitivity. We conclude that short source-detector separations are an option to consider for the design of probes so as to improve image quality for diffuse optical tomography in reflectance.
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Affiliation(s)
- Agathe Puszka
- CEA, LETI, Minatec Campus, 17 rue des Martyrs, 38054 Grenoble Cedex 9,
France
| | - Laura Di Sieno
- Politecnico di Milano, Dipartimento di Fisica, Piazza Leonardo da Vinci 32, Milano I-20133,
Italy
| | - Alberto Dalla Mora
- Politecnico di Milano, Dipartimento di Fisica, Piazza Leonardo da Vinci 32, Milano I-20133,
Italy
| | - Antonio Pifferi
- Politecnico di Milano, Dipartimento di Fisica, Piazza Leonardo da Vinci 32, Milano I-20133,
Italy
| | - Davide Contini
- Politecnico di Milano, Dipartimento di Fisica, Piazza Leonardo da Vinci 32, Milano I-20133,
Italy
| | | | - Anne Koenig
- CEA, LETI, Minatec Campus, 17 rue des Martyrs, 38054 Grenoble Cedex 9,
France
| | - Gianluca Boso
- Politecnico di Milano, Dipartimento di Elettronica, Informazione e Bioingegneria, Piazza Leonardo da Vinci 32 – I-20133 Milano,
Italy
| | - Alberto Tosi
- Politecnico di Milano, Dipartimento di Elettronica, Informazione e Bioingegneria, Piazza Leonardo da Vinci 32 – I-20133 Milano,
Italy
| | - Lionel Hervé
- CEA, LETI, Minatec Campus, 17 rue des Martyrs, 38054 Grenoble Cedex 9,
France
| | - Jean-Marc Dinten
- CEA, LETI, Minatec Campus, 17 rue des Martyrs, 38054 Grenoble Cedex 9,
France
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304
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Funane T, Sato H, Yahata N, Takizawa R, Nishimura Y, Kinoshita A, Katura T, Atsumori H, Fukuda M, Kasai K, Koizumi H, Kiguchi M. Concurrent fNIRS-fMRI measurement to validate a method for separating deep and shallow fNIRS signals by using multidistance optodes. NEUROPHOTONICS 2015; 2:015003. [PMID: 26157983 PMCID: PMC4478864 DOI: 10.1117/1.nph.2.1.015003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2014] [Accepted: 01/05/2015] [Indexed: 05/12/2023]
Abstract
It has been reported that a functional near-infrared spectroscopy (fNIRS) signal can be contaminated by extracerebral contributions. Many algorithms using multidistance separations to address this issue have been proposed, but their spatial separation performance has rarely been validated with simultaneous measurements of fNIRS and functional magnetic resonance imaging (fMRI). We previously proposed a method for discriminating between deep and shallow contributions in fNIRS signals, referred to as the multidistance independent component analysis (MD-ICA) method. In this study, to validate the MD-ICA method from the spatial aspect, multidistance fNIRS, fMRI, and laser-Doppler-flowmetry signals were simultaneously obtained for 12 healthy adult males during three tasks. The fNIRS signal was separated into deep and shallow signals by using the MD-ICA method, and the correlation between the waveforms of the separated fNIRS signals and the gray matter blood oxygenation level-dependent signals was analyzed. A three-way analysis of variance ([Formula: see text]) indicated that the main effect of fNIRS signal depth on the correlation is significant [[Formula: see text], [Formula: see text]]. This result indicates that the MD-ICA method successfully separates fNIRS signals into spatially deep and shallow signals, and the accuracy and reliability of the fNIRS signal will be improved with the method.
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Affiliation(s)
- Tsukasa Funane
- Hitachi, Ltd., Central Research Laboratory, Hatoyama, Saitama 350-0395, Japan
- Address all correspondence to: Tsukasa Funane, E-mail:
| | - Hiroki Sato
- Hitachi, Ltd., Central Research Laboratory, Hatoyama, Saitama 350-0395, Japan
| | - Noriaki Yahata
- The University of Tokyo, Graduate School of Medicine, Department of Youth Mental Health, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Ryu Takizawa
- The University of Tokyo, Graduate School of Medicine, Department of Neuropsychiatry, Bunkyo-ku, Tokyo 113-8655, Japan
- King’s College London, Institute of Psychiatry, MRC Social, Genetic and Developmental Psychiatry Centre, London, SE5 8AF, United Kingdom
| | - Yukika Nishimura
- The University of Tokyo, Graduate School of Medicine, Department of Neuropsychiatry, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Akihide Kinoshita
- The University of Tokyo, Graduate School of Medicine, Department of Neuropsychiatry, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Takusige Katura
- Hitachi, Ltd., Central Research Laboratory, Hatoyama, Saitama 350-0395, Japan
| | - Hirokazu Atsumori
- Hitachi, Ltd., Central Research Laboratory, Hatoyama, Saitama 350-0395, Japan
| | - Masato Fukuda
- Gunma University Graduate School of Medicine, Department of Psychiatry and Neuroscience, Maebashi, Gunma 371-8511, Japan
| | - Kiyoto Kasai
- The University of Tokyo, Graduate School of Medicine, Department of Neuropsychiatry, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Hideaki Koizumi
- Hitachi, Ltd., Central Research Laboratory, Hatoyama, Saitama 350-0395, Japan
| | - Masashi Kiguchi
- Hitachi, Ltd., Central Research Laboratory, Hatoyama, Saitama 350-0395, Japan
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305
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Zhang T, Zhou J, Carney PR, Jiang H. Towards real-time detection of seizures in awake rats with GPU-accelerated diffuse optical tomography. J Neurosci Methods 2014; 240:28-36. [PMID: 25445250 DOI: 10.1016/j.jneumeth.2014.10.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Revised: 09/06/2014] [Accepted: 10/21/2014] [Indexed: 01/17/2023]
Abstract
BACKGROUND Advancement in clinically relevant studies like seizure interruption using functional neuro imaging tools has shown that specific changes in hemodynamics precede and accompany seizure onset and propagation. However, preclinical seizure experiments need to be conducted in awake animals with images reconstructed and displayed in real-time. METHODS This article describes an approach that can be utilized to tackle these challenges. A subject specific head interface and restraining method was designed to allow for DOT to imaging of hemodynamic changes in unanesthetized rats during evoked acute seizures. Using CUDA programming model, the finite-element based nonlinear iterative algorithm for image reconstruction was parallelized. RESULTS Early hemodynamic changes were monitored in real time and observed tens of seconds prior to seizure onset. Utilizing the massive parallelization offered by graphic processing units (GPU), DOT was extended to online image reconstruction within 1s. COMPARISON WITH EXISTING METHODS Pre-seizure state related hemodynamic changes were detected in awake rats. 3D monitoring of hemodynamic changes was performed in real time with our parallelized image reconstruction procedure. CONCLUSION Diffuse optical tomography (DOT) is a promising neuroimaging tool for the investigation of seizures in awake animals.
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Affiliation(s)
- Tao Zhang
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Junli Zhou
- Department of Pediatrics, University of Florida, Gainesville, FL 32611, USA
| | - Paul R Carney
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL 32611, USA; Department of Pediatrics, University of Florida, Gainesville, FL 32611, USA; Department of Neurology, University of Florida, Gainesville, FL 32611, USA; Department of Neuroscience, University of Florida, Gainesville, FL 32611, USA
| | - Huabei Jiang
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL 32611, USA.
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306
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Wu X, Eggebrecht AT, Ferradal SL, Culver JP, Dehghani H. Quantitative evaluation of atlas-based high-density diffuse optical tomography for imaging of the human visual cortex. BIOMEDICAL OPTICS EXPRESS 2014; 5:3882-900. [PMID: 25426318 PMCID: PMC4242025 DOI: 10.1364/boe.5.003882] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Revised: 08/21/2014] [Accepted: 09/25/2014] [Indexed: 05/24/2023]
Abstract
Image recovery in diffuse optical tomography (DOT) of the human brain often relies on accurate models of light propagation within the head. In the absence of subject specific models for image reconstruction, the use of atlas based models are showing strong promise. Although there exists some understanding in the use of some limited rigid model registrations in DOT, there has been a lack of a detailed analysis between errors in geometrical accuracy, light propagation in tissue and subsequent errors in dynamic imaging of recovered focal activations in the brain. In this work 11 different rigid registration algorithms, across 24 simulated subjects, are evaluated for DOT studies in the visual cortex. Although there exists a strong correlation (R(2) = 0.97) between geometrical surface error and internal light propagation errors, the overall variation is minimal when analysing recovered focal activations in the visual cortex. While a subject specific mesh gives the best results with a 1.2 mm average location error, no single algorithm provides errors greater than 4.5 mm. This work demonstrates that the use of rigid algorithms for atlas based imaging is a promising route when subject specific models are not available.
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Affiliation(s)
- Xue Wu
- School of Computer Science, University of Birmingham, Birmingham, B15 2TT,
UK
| | - Adam T. Eggebrecht
- Department of Radiology, Washington University School of Medicine, 4525 Scott Avenue, St Louis, MO, 63110,
USA
| | - Silvina L Ferradal
- Department of Radiology, Washington University School of Medicine, 4525 Scott Avenue, St Louis, MO, 63110,
USA
- Department of Biomedical Engineering, Washington University, One Brookings Drive, St. Louis, MO, 63130,
USA
| | - Joseph P. Culver
- Department of Radiology, Washington University School of Medicine, 4525 Scott Avenue, St Louis, MO, 63110,
USA
- Department of Biomedical Engineering, Washington University, One Brookings Drive, St. Louis, MO, 63130,
USA
| | - Hamid Dehghani
- School of Computer Science, University of Birmingham, Birmingham, B15 2TT,
UK
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307
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Wei X, Lau AKS, Xu Y, Zhang C, Mussot A, Kudlinski A, Tsia KK, Wong KKY. Broadband fiber-optical parametric amplification for ultrafast time-stretch imaging at 1.0 μm. OPTICS LETTERS 2014; 39:5989-5992. [PMID: 25361137 DOI: 10.1364/ol.39.005989] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We demonstrate a broadband all-fiber-optical parametric amplifier for ultrafast time-stretch imaging at 1.0 μm, featured by its compact design, alignment-free, high efficiency, and flexible gain spectrum through fiber nonlinearity- and dispersion-engineering: specifically on a dispersion-stabilized photonic-crystal fiber (PCF) to achieve a net gain over 20 THz (75 nm) and a highest gain of ~6000 (37.5 dB). Another unique feature of the parametric amplifier, over other optical amplifiers, is the coherent generation of a synchronized signal replica (called idler) that can be exploited to offer an extra 3-dB gain by optically superposing the signal and idler. It further enhances signal contrast and temporal stability. For proof-of-concept purpose, ultrahigh speed and diffraction-limited time-stretch microscopy is demonstrated with a single-shot line-scan rate of 13 MHz based on the dual-band (signal and idler) detection. Our scheme can be extended to other established bioimaging modalities, such as optical coherence tomography, near infrared fluorescence, and photoacoustic imaging, where weak signal detection at high speed is required.
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308
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Torricelli A, Contini D, Mora AD, Pifferi A, Re R, Zucchelli L, Caffini M, Farina A, Spinelli L. Neurophotonics: non-invasive optical techniques for monitoring brain functions. FUNCTIONAL NEUROLOGY 2014; 29:223-30. [PMID: 25764252 PMCID: PMC4370435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The aim of this review is to present the state of the art of neurophotonics, a recently founded discipline lying at the interface between optics and neuroscience. While neurophotonics also includes invasive techniques for animal studies, in this review we focus only on the non-invasive methods that use near infrared light to probe functional activity in the brain, namely the fast optical signal, diffuse correlation spectroscopy, and functional near infrared spectroscopy methods. We also present an overview of the physical principles of light propagation in biological tissues, and of the main physiological sources of signal. Finally, we discuss the open issues in models, instrumentation, data analysis and clinical approaches.
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Affiliation(s)
| | - Davide Contini
- Dipartimento di Fisica, Politecnico di Milano, Milan, Italy
| | | | | | - Rebecca Re
- Dipartimento di Fisica, Politecnico di Milano, Milan, Italy
| | | | - Matteo Caffini
- Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Milan, Italy
| | - Andrea Farina
- Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale per le Ricerche, Milan, Italy
| | - Lorenzo Spinelli
- Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale per le Ricerche, Milan, Italy
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