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"Near infrared spectroscopy"

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https://www.readbyqxmd.com/read/28227929/savitzky-golay-coupled-with-digital-bandpass-filtering-as-a-pre-processing-technique-in-the-quantitative-analysis-of-glucose-from-near-infrared-spectra
#1
Krishna Chaitanya Patchava, Osamah Alrezj, Mohammed Benaissa, Hatim Behairy, Krishna Chaitanya Patchava, Osamah Alrezj, Mohammed Benaissa, Hatim Behairy, Krishna Chaitanya Patchava, Mohammed Benaissa, Osamah Alrezj, Hatim Behairy
This paper proposes a novel pre-processing method based on combining bandpass with Savitzky-Golay filtering to further improve the prediction performance of the linear calibration models Principal Component Regression (PCR) and Partial Least Squares Regression (PLSR) in near infrared spectroscopy. The proposed method is compared to the highly efficient RReliefF pre-processing technique for further evaluation. The developed calibration models have been validated to predict the glucose concentration from near infrared spectra of a mixture of glucose and human serum albumin in a phosphate buffer solution...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227668/mental-stress-grading-based-on-fnirs-signals
#2
Fares Al-Shargie, Tong Boon Tang, Masashi Kiguchi, Fares Al-Shargie, Tong Boon Tang, Masashi Kiguchi, Masashi Kiguchi, Tong Boon Tang, Fares Al-Shargie
In this study, we propose functional near infrared spectroscopy (fNIRS) to objectively grade different levels of mental stress. The levels of stress were set based on the difficulty of arithmetic task, time pressure and negative feedback about peer performance. We examined the proposed approach on twelve human subjects using the Montreal Imaging Stress Task. The experiment results revealed a reduction in cortical activation at prefrontal cortex when stressed, and the differences in hemodynamic response between control condition and under stress were significant for arithmetic difficulty level one, two and three, respectively, (p = 0...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227336/assessment-of-mental-workload-by-eeg-fnirs
#3
Haleh Aghajani, Ahmet Omurtag, Haleh Aghajani, Ahmet Omurtag, Ahmet Omurtag, Haleh Aghajani
We investigated the use of a multimodal functional neuroimaging system in quantifying mental workload of healthy human volunteers. We recorded behavioral performance measures as well as electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS) simultaneously from subjects performing n-back tasks. The EEG and fNIRS signals were used in feature generation and classification offline using support vector machines. We examined the classification accuracy of three distinct systems: EEG based; fNIRS based; and Hybrid, which contained features from the first two systems as based on their interactions...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226810/decoding-movement-direction-using-phase-space-analysis-of-hemodynamic-responses-to-arm-movements-based-on-functional-near-infrared-spectroscopy
#4
Nicoladie Tam, Luca Pollonini, George Zouridakis, Nicoladie Tam, Luca Pollonini, George Zouridakis, Luca Pollonini, Nicoladie Tam, George Zouridakis
In this study we applied phase-space analysis on the hemodynamic signals recorded from the motor cortex of human subjects using functional near infrared spectroscopy (fNIRS) to decode the direction of intentional hand movements. Our goal is to develop a brain-computer-interface (BCI) based on optical imaging that can control a wheelchair. To establish the relationship between the hemodynamic response and movement direction, participants were asked to perform repetitive arm movements in two orthogonal directions (right-left and front-back) on a horizontal plane, while the time course of the oxy-hemoglobin (oxy-Hb) and deoxy-hemoglobin (deoxy-Hb) responses were recorded...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226764/analytical-approach-to-the-temporal-changes-in-nirs-signals-to-separate-hemodynamic-change-from-brain-activity
#5
K Fukuda, H Takemoto, A Ikeda, K Fukuda, H Takemoto, A Ikeda, K Fukuda, H Takemoto, A Ikeda
In brain function measurements by near-infrared spectroscopy (NIRS), we focus on the temporal changes in the oxygenated and deoxygenated hemoglobin concentrations and propose an analytical approach to the temporal changes of the hemoglobin concentrations' cross-correlation coefficient in the brain functional signals. The cross-correlation coefficient between the oxygenated and deoxygenated hemoglobin concentrations shows negative values for brain activity and positive values for hemodynamic changes. Experiments with a 16-channel functional NIRS system show that our proposed approach clarifies the interpretation of the measured NIRS signals and it can be used to estimate the influence of hemodynamic change on brain activity...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28220068/reduced-activity-in-the-right-inferior-frontal-gyrus-in-elderly-apoe-e4-carriers-during-a-verbal-fluency-task
#6
Andrea Katzorke, Julia B M Zeller, Laura D Müller, Martin Lauer, Thomas Polak, Andreas Reif, Jürgen Deckert, Martin J Herrmann
Apolipoprotein-E4 (APOE-E4) is a major genetic risk factor for developing Alzheimer's disease (AD). The verbal fluency task (VFT), especially the subtask category fluency, has shown to provide a good discrimination between cognitively normal controls and subjects with AD. Interestingly, APOE-E4 seems to have no effect on the behavioral performance during a VFT in healthy elderly. Thus, the purpose of the present study was to reveal possible compensation mechanisms by investigating the effect of APOE-E4 on the hemodynamic response in non-demented elderly during a VFT by using functional near-infrared spectroscopy (fNIRS)...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28218851/temperature-drift-of-conformational-equilibria-of-butyl-alcohols-studied-by-near-infrared-spectroscopy-and-fully-anharmonic-dft
#7
Justyna Grabska, Krzysztof Bernard Beć, Yukihiro Ozaki, Christian W Huck
Conformational isomerism of aliphatic alcohols with respect to the internal rotation of C-O(H) group and its impact on near-infrared (NIR) spectra has been known in the literature. However, no attempt has ever been made to investigate systematically whether and how the conformational flexibility of the aliphatic chain determines the observed NIR data of aliphatic alcohols. In the present study NIR spectra of four kinds of butyl alcohols, 1-butanol, 2-butanol, iso-butanol and tert-butanol, were investigated in diluted (0...
February 20, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28217088/a-non-parametric-approach-to-the-overall-estimate-of-cognitive-load-using-nirs-time-series
#8
Soheil Keshmiri, Hidenobu Sumioka, Ryuji Yamazaki, Hiroshi Ishiguro
We present a non-parametric approach to prediction of the n-back n ∈ {1, 2} task as a proxy measure of mental workload using Near Infrared Spectroscopy (NIRS) data. In particular, we focus on measuring the mental workload through hemodynamic responses in the brain induced by these tasks, thereby realizing the potential that they can offer for their detection in real world scenarios (e.g., difficulty of a conversation). Our approach takes advantage of intrinsic linearity that is inherent in the components of the NIRS time series to adopt a one-step regression strategy...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28214930/investigation-of-optical-neuro-monitoring-technique-for-detection-of-maintenance-and-emergence-states-during-general-anesthesia
#9
Gabriela Hernandez-Meza, Meltem Izzetoglu, Mary Osbakken, Michael Green, Hawa Abubakar, Kurtulus Izzetoglu
The American Society of Anesthesiologist recommends peripheral physiological monitoring during general anesthesia, which offers no information regarding the effects of anesthetics on the brain. Since no "gold standard" method exists for this evaluation, such a technique is needed to ensure patient comfort, procedure quality and safety. In this study we investigated functional near infrared spectroscopy (fNIRS) as possible monitor of anesthetic effects on the prefrontal cortex. Anesthetic drugs, such as sevoflurane, suppress the cerebral metabolism and alter the cerebral blood flow...
February 18, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28214493/the-value-of-near-infrared-spectroscopy-for-the-assessment-of-calf-muscle-function-in-venous-patients
#10
Spyros N Vasdekis, Ioannis Tzemailas, Constantine N Antonopoulos, Sotiria Mastoraki, George K Mantas, Andreas Lazaris
OBJECTIVE: Near-infrared spectroscopy (NIRS) is a noninvasive technique with the potential to determine the degree of tissue oxygenation. The aim of the current study was to investigate the use of NIRS as a reliable method of detecting calf muscle pump dysfunction in groups of patients with venous disease. METHODS: Patients with superficial venous insufficiency (SVI) or history of deep venous thrombosis (DVT) were classified according to the comprehensive classification system for chronic venous disorders (clinical class, etiology, anatomy, and pathophysiology) and compared with controls (GROUP variable)...
March 2017: Journal of Vascular Surgery. Venous and Lymphatic Disorders
https://www.readbyqxmd.com/read/28209317/contralateral-cerebral-hypometabolism-after-cerebellar-stroke-a-functional-near-infrared-spectroscopy-study
#11
Kazuya Saita, Toshiyasu Ogata, Junko Watanabe, Yoshio Tsuboi, Masaki Takahara, Tooru Inoue, Takashi Morishita
INTRODUCTION: We report the changes in cortical activity evaluated using functional near-infrared spectroscopy (fNIRS) in 2 cases with cerebellar stroke. METHODS: Using an fNIRS imaging system, changes in the oxygenated hemoglobin concentration (ΔOxy-Hb) from baseline were estimated. Design and verbal fluency tasks were conducted for evaluation of visuospatial and language functions, respectively. RESULTS: The contralateral prefrontal area showed limited activation compared with the ipsilateral one in the case with either cerebellar stroke...
February 10, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28207899/human-cortical-neural-correlates-of-visual-fatigue-during-binocular-depth-perception-an-fnirs-study
#12
Tingting Cai, Huilin Zhu, Jie Xu, Shijing Wu, Xinge Li, Sailing He
Functional near-infrared spectroscopy (fNIRS) was adopted to investigate the cortical neural correlates of visual fatigue during binocular depth perception for different disparities (from 0.1° to 1.5°). By using a slow event-related paradigm, the oxyhaemoglobin (HbO) responses to fused binocular stimuli presented by the random-dot stereogram (RDS) were recorded over the whole visual dorsal area. To extract from an HbO curve the characteristics that are correlated with subjective experiences of stereopsis and visual fatigue, we proposed a novel method to fit the time-course HbO curve with various response functions which could reflect various processes of binocular depth perception...
2017: PloS One
https://www.readbyqxmd.com/read/28205609/association-of-fronto-temporal-function-with-cognitive-ability-in-schizophrenia
#13
Shenghong Pu, Kazuyuki Nakagome, Masashi Itakura, Masaaki Iwata, Izumi Nagata, Koichi Kaneko
Deficits in neuropsychological performance are common in schizophrenia, but their relationship with the fronto-temporal functional abnormalities associated with this condition remains unclear. We explored the relationship between neuropsychological performance as measured using the Brief Assessment of Cognition in Schizophrenia (BACS) and the Social Cognition Screening Questionnaire theory of mind (ToM) subscale and fronto-temporal function in 23 patients with schizophrenia and 23 age- and gender-matched healthy controls (HCs), using 52-channel near-infrared spectroscopy (NIRS)...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28199475/examiner-s-finger-mounted-near-infrared-spectroscopy-is-feasible-to-analyze-cerebral-and-skeletal-muscle-oxygenation-in-conscious-chihuahuas
#14
Keisuke Hiwatashi, Kimiaki Doi, Risuke Mizuno, Makoto Yokosuka
No abstract text is available yet for this article.
February 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28197672/functional-near-infrared-spectroscopy-fnirs-brain-imaging-of-multi-sensory-integration-during-computerized-dynamic-posturography-in-middle-aged-and-older-adults
#15
Chia-Cheng Lin, Jeffrey W Barker, Patrick J Sparto, Joseph M Furman, Theodore J Huppert
Studies suggest that aging affects the sensory re-weighting process, but the neuroimaging evidence is minimal. Functional Near-Infrared Spectroscopy (fNIRS) is a novel neuroimaging tool that can detect brain activities during dynamic movement condition. In this study, fNIRS was used to investigate the hemodynamic changes in the frontal-lateral, temporal-parietal, and occipital regions of interest (ROIs) during four sensory integration conditions that manipulated visual and somatosensory feedback in 15 middle-aged and 15 older adults...
February 14, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28196885/hemoglobin-phase-of-oxygenation-and-deoxygenation-in-early-brain-development-measured-using-fnirs
#16
Hama Watanabe, Yoshihiko Shitara, Yoshinori Aoki, Takanobu Inoue, Shinya Tsuchida, Naoto Takahashi, Gentaro Taga
A crucial issue in neonatal medicine is the impact of preterm birth on the developmental trajectory of the brain. Although a growing number of studies have shown alterations in the structure and function of the brain in preterm-born infants, we propose a method to detect subtle differences in neurovascular and metabolic functions in neonates and infants. Functional near-infrared spectroscopy (fNIRS) was used to obtain time-averaged phase differences between spontaneous low-frequency (less than 0.1 Hz) oscillatory changes in oxygenated hemoglobin (oxy-Hb) and those in deoxygenated hemoglobin (deoxy-Hb)...
February 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28196453/near-infrared-spectroscopy-in-gait-disorders
#17
Vera Gramigna, Giovanni Pellegrino, Antonio Cerasa, Simone Cutini, Roberta Vasta, Giuseppe Olivadese, Iolanda Martino, Aldo Quattrone
Walking is a complex motor behavior with a special relevance in clinical neurology. Many neurological diseases, such as Parkinson's disease and stroke, are characterized by gait disorders whose neurofunctional correlates are poorly investigated. Indeed, the analysis of real walking with the standard neuroimaging techniques poses strong challenges, and only a few studies on motor imagery or walking observation have been performed so far. Functional near-infrared spectroscopy (fNIRS) is becoming an important research tool to assess functional activity in neurological populations or for special tasks, such as walking, because it allows investigating brain hemodynamic activity in an ecological setting, without strong immobility constraints...
January 1, 2017: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/28190559/use-of-renal-near-infrared-spectroscopy-measurements-in-congenital-diaphragmatic-hernia-patients-on-ecmo
#18
Patricio E Lau, Stephanie Cruz, Joseph Garcia-Prats, Milenka Cuevas, Christopher Rhee, Darrell L Cass, Sarah E Horne, Timothy C Lee, Stephen E Welty, Oluyinka O Olutoye
INTRODUCTION: This study tests the hypothesis that renal tissue oxygen saturation as measured by Near Infrared Spectroscopy (NIRS) would correlate with urine output in neonates with congenital diaphragmatic hernia (CDH) on extracorporeal membrane oxygenation (ECMO). METHODS: Between 2012 and 2015, neonates with CDH were enrolled as part of a comprehensive study that provided renal/cerebral/abdominal NIRS monitoring for the duration of ECMO support. Continuous NIRS measurements, mean arterial pressure, and urine output were recorded...
January 27, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28189045/evaluations-of-hemodynamic-changes-during-neuropsychological-test-batteries-using-near-infrared-spectroscopy-in-patients-with-obsessive-compulsive-disorder
#19
Keiichiro Mukai, Naomi Matsuura, Akihiro Nakajima, Yoshinobu Yanagisawa, Yoshikazu Yoshida, Kensei Maebayashi, Kazuhisa Hayashida, Hisato Matsunaga
No abstract text is available yet for this article.
January 27, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28187816/multimodal-neurologic-monitoring
#20
G Korbakis, P M Vespa
Neurocritical care has two main objectives. Initially, the emphasis is on treatment of patients with acute damage to the central nervous system whether through infection, trauma, or hemorrhagic or ischemic stroke. Thereafter, attention shifts to the identification of secondary processes that may lead to further brain injury, including fever, seizures, and ischemia, among others. Multimodal monitoring is the concept of using various tools and data integration to understand brain physiology and guide therapeutic interventions to prevent secondary brain injury...
2017: Handbook of Clinical Neurology
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