scholarly journals Study of the FMRI blood oxygen level dependent effect by near-infrared spectroscopy

2003 ◽  
Author(s):  
Vladislav Toronov ◽  
Andrew Webb ◽  
Scott Walker ◽  
Rajarsi Gupta ◽  
Jee H. Choi ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Blood Oxygen Level Dependent ◽  
Blood Oxygen ◽  
Oxygen Level ◽  
Blood Oxygen Level ◽  
Dependent Effect

scholarly journals The Effect of Motion Artifacts on Near-Infrared Spectroscopy (NIRS) Data and Proposal of a Video-NIRS System

2017 ◽  
Vol 7 (3) ◽  
pp. 406-418
Author(s):  
Masayuki Satoh ◽  
Keisuke Okamoto ◽  
Ken-ichi Tabei ◽  
Hirotaka Kida ◽  
Hidekazu Tomimoto ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Blood Oxygen Level Dependent ◽  
Motion Artifacts ◽  
Video Capture ◽  
Blood Oxygen Level ◽  
Word Fluency ◽  
Nirs Data ◽  
Hb Concentration

Aims: The aims of this study were (1) to investigate the influence of physical movement on near-infrared spectroscopy (NIRS) data, (2) to establish a video-NIRS system which simultaneously records NIRS data and the subject’s movement, and (3) to measure the oxygenated hemoglobin (oxy-Hb) concentration change (Δoxy-Hb) during a word fluency (WF) task. Experiment 1: In 5 healthy volunteers, we measured the oxy-Hb and deoxygenated hemoglobin (deoxy-Hb) concentrations during 11 kinds of facial, head, and extremity movements. The probes were set in the bilateral frontal regions. The deoxy-Hb concentration was increased in 85% of the measurements. Experiment 2: Using a pillow on the backrest of the chair, we established the video-NIRS system with data acquisition and video capture software. One hundred and seventy-six elderly people performed the WF task. The deoxy-Hb concentration was decreased in 167 subjects (95%). Experiment 3: Using the video-NIRS system, we measured the Δoxy-Hb, and compared it with the results of the WF task. Δoxy-Hb was significantly correlated with the number of words. Conclusion: Like the blood oxygen level-dependent imaging effect in functional MRI, the deoxy-Hb concentration will decrease if the data correctly reflect the change in neural activity. The video-NIRS system might be useful to collect NIRS data by recording the waveforms and the subject’s appearance simultaneously.

Blood oxygen-level dependent functional assessment of cerebrovascular reactivity: Feasibility for intraoperative 3 Tesla MRI

2016 ◽  
Vol 77 (2) ◽  
pp. 806-813 ◽  
Author(s):  
Jorn Fierstra ◽  
Jan-Karl Burkhardt ◽  
Christiaan Hendrik Bas van Niftrik ◽  
Marco Piccirelli ◽  
Athina Pangalu ◽  
...  
Keyword(s):  
Functional Assessment ◽  
Blood Oxygen Level Dependent ◽  
Cerebrovascular Reactivity ◽  
3 Tesla ◽  
Blood Oxygen ◽  
Oxygen Level ◽  
Blood Oxygen Level ◽  
3 Tesla Mri
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