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Neonatal Brain Resting-State Functional Connectivity Imaging Modalities Henry Ford Health System Henry Ford Health System Scholarly Commons Research Articles Research Administration 6-1-2018 Neonatal brain resting-state functional connectivity imaging modalities Ali-Reza Mohammadi-Nejad Mahdi Mahmoudzadeh Mahlegha S. Hassanpour Fabrice Wallois Otto Muzik See next page for additional authors Follow this and additional works at: https://scholarlycommons.henryford.com/research_articles Recommended Citation Mohammadi-Nejad AR, Mahmoudzadeh M, Hassanpour MS, Wallois F, Muzik O, Papadelis C, Hansen A, Soltanian-Zadeh H, Gelovani J, Nasiriavanaki M. Neonatal brain resting-state functional connectivity imaging modalities. Photoacoustics. Jun 2018;10:1-19. This Article is brought to you for free and open access by the Research Administration at Henry Ford Health System Scholarly Commons. It has been accepted for inclusion in Research Articles by an authorized administrator of Henry Ford Health System Scholarly Commons. Authors Ali-Reza Mohammadi-Nejad, Mahdi Mahmoudzadeh, Mahlegha S. Hassanpour, Fabrice Wallois, Otto Muzik, Christos Papadelis, Anne Hansen, Hamid Soltanian-Zadeh, Juri Gelovani, and Mohammadreza Nasiriavanaki This article is available at Henry Ford Health System Scholarly Commons: https://scholarlycommons.henryford.com/ research_articles/26 Photoacoustics 10 (2018) 1–19 Contents lists available at ScienceDirect Photoacoustics journal homepage: www.elsevier.com/locate/pacs Review article Neonatal brain resting-state functional connectivity imaging modalities a,b c,d e Ali-Reza Mohammadi-Nejad , Mahdi Mahmoudzadeh , Mahlega S. Hassanpour , c,d f,g h h Fabrice Wallois , Otto Muzik , Christos Papadelis , Anne Hansen , a,b,g i,k i,j,k, Hamid Soltanian-Zadeh , Juri Gelovani , Mohammadreza Nasiriavanaki * a CIPCE, School of Electrical and Computer Engineering, College of Engineering, University of Tehran, Tehran, Iran b Departments of Radiology and Research Administration, Henry Ford Health System, Detroit, MI, USA c INSERM, U1105, Université de Picardie, CURS, F80036, Amiens, France d INSERM U1105, Exploration Fonctionnelles du Système Nerveux Pédiatrique, South University Hospital, F80054, Amiens Cedex, France e Laureate Institute for Brain Research, Tulsa, OK, USA f Department of Pediatrics, Wayne State University School of Medicine, Detroit, MI, USA g Department of Radiology, Wayne State University School of Medicine, Detroit, MI, USA h Boston Children’s Hospital, Department of Medicine, Harvard Medical School, Boston, MA, USA i Department of Biomedical Engineering, Wayne State University, Detroit, MI, USA j Department of Neurology, Wayne State University School of Medicine, Detroit, MI, USA k Molecular Imaging Program, Barbara Ann Karmanos Cancer Institute, Wayne State University, Detroit, MI, USA A R T I C L E I N F O A B S T R A C T Article history: Received 3 August 2017 Infancy is the most critical period in human brain development. Studies demonstrate that subtle brain Received in revised form 12 January 2018 abnormalities during this state of life may greatly affect the developmental processes of the newborn Accepted 27 January 2018 infants. One of the rapidly developing methods for early characterization of abnormal brain development Available online 2 February 2018 is functional connectivity of the brain at rest. While the majority of resting-state studies have been conducted using magnetic resonance imaging (MRI), there is clear evidence that resting-state functional Keywords: connectivity (rs-FC) can also be evaluated using other imaging modalities. The aim of this review is to Neonatal brain compare the advantages and limitations of different modalities used for the mapping of infants’ brain Infants functional connectivity at rest. In addition, we introduce photoacoustic tomography, a novel functional Neuroimaging modalities neuroimaging modality, as a complementary modality for functional mapping of infants’ brain. Resting-state functional connectivity © 2018 Published by Elsevier GmbH. This is an open access article under the CC BY-NC-ND license (http:// Photoacoustic tomography creativecommons.org/licenses/by-nc-nd/4.0/). Contents 1. Introduction . 2 2. Resting-state functional connectivity analysis . 2 2.1. Seed-based analysis . 2 2.2. Independent component analysis . 3 2.3. Graph theory . 3 2.4. Clustering . 4 3. Neuroimaging modalities for measuring resting-state functional connectivity . 5 3.1. Functional magnetic resonance imaging (fMRI) . 5 3.2. Electroencephalography (EEG) . 6 3.3. Magnetoencephalography (MEG) . 6 3.4. Positron emission tomography (PET) . 7 3.5. Functional near-infrared spectroscopy (fNIRS) . 9 * Corresponding author at: Department of Biomedical Engineering, Wayne State University, Detroit, MI, USA. E-mail address: [email protected] (M. Nasiriavanaki). https://doi.org/10.1016/j.pacs.2018.01.003 2213-5979/© 2018 Published by Elsevier GmbH. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). 2 A.-R. Mohammadi-Nejad et al. / Photoacoustics 10 (2018) 1–19 3.6. Diffuse optical tomography (DOT) . 10 3.7. Functional ultrasound imaging . 10 3.8. Photoacoustic tomography (PAT) . 11 4. Summary and conclusions . 12 Conflict of interest . 13 Acknowledgements . 13 References . 13 1. Introduction focus of the current review is on the rs-FC studies using different modalities in the early stages of human brain development. We Because studies of human infants are not amenable to invasive discuss various methodological challenges posed by these manipulations, advanced non-invasive modalities and analytical promising modalities. We also highlight that, despite these approaches, such as brain functional connectivity (FC), have been challenges, early work indicates a strong correlation among these adapted from the adult literature to analyze neonatal brain modalities in the study of RSNs. Finally, we focus on photoacoustic functional data. FC is a statistical association of neuronal activity tomography (PAT) [30–32], an emerging imaging modality, time courses across distinct brain regions, supporting specific illustrating its strengths and limitations, and discussing its cognitive processes [1]. Advances in imaging modalities have potential role in the field of resting-state functional brain improved our understanding of how functional brain connectivity connectivity studies in infants. develops during the neonatal period [2–4] and how various brain injuries may affect the development of the immature brain [5]. 2. Resting-state functional connectivity analysis When these associations are examined in the absence of any external tasks, they demonstrate whether and how different brain The theory of connectivity among different regions of the brain areas are synchronized to form resting-state networks (RSNs) [6]. is one of the oldest notions in neuroscience ([33] and references These RSNs, also called intrinsic networks [7,8], are spatially therein). Beside anatomical connectivity, two other forms of brain distinct regions of the brain that exhibit a low-frequency temporal connectivity are defined: functional and effective connectivity, two coherence and provide a means to depict the brain’s functional concepts derived from functional neuroimaging modalities. While organization. RSNs have been reasonably well-characterized in the effective connectivity (EF) describes causal interactions healthy adults [9]. between activated brain areas, FC refers to statistical dependency Initial description of immature forms of RSNs was reported by among activity of distinct and distant neural populations. The Fransson, et al. [10], who found five distinct RSNs in a cohort of very underlying assumption is that low-frequency temporal correla- preterm (born 30 weeks gestation) infants at term equivalent tions among different brain regions represent FC patterns. In the postmenstrual age. More recent works have also examined large- absence of external stimuli, these connectivity patterns have been scale RSNs architecture supporting motor, sensory, and cognitive termed ‘intrinsic connectivity networks’ [34] or ‘resting-state functions in term- [3,4] and preterm-born infants [11–14] as well networks’, RSNs [35]. as in the pediatric age group [15,16]. These studies have identified Most of the work done in examining patterns of rs-FC strongly some RSNs grossly similar to those of adults. Moreover, at least two support the hypothesis that patterns of rs-FC (aka RSNs) represent studies have observed RSN activity in human fetuses in utero highly organized and spatially coordinated signaling activity [17,18]. The application of resting-state functional connectivity (rs- within known brain systems that are critical for basic brain FC) has provided novel insight into the neurobiological basis of functions [36]. Some groups have shown that the magnitude of rs- developmental abnormalities, with recent literature implicating FC can be used to infer the cerebral metabolic rate of glucose [37], network specific disruptions in RSN architecture in pediatric while others have shown that brain regions exhibiting a high disorders such as autism spectrum disorders [19], attention deficit number of functional connections exhibit high aerobic glycolysis hyperactivity disorder [20], and Tourette syndrome [21]. [38,39]. RSNs can be reliably and reproducibly detected at the Different neuroimaging modalities have been employed to individual subject and group levels across a range of analysis study the human infant brain at rest, providing complementary techniques
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