Fnirs Probe Placement
Fnirs Probe Placement - Related Videos
06:57
Arterial Line Placement
0 Views •
2023
Source: Sharon Bord, MD, Department of Emergency Medicine, The Johns Hopkins University School of Medicine, Maryland, USA When monitoring patients, it is important to obtain values that are accurate and reliable. Blood pressure monitoring is one of the essential vital signs, and for a majority of patients, measuring it utilizing non-invasive techniques provides accurate values. However, there are situations in which the blood pressure requires more exact, specific, and reliable measurements.
09:51
Intraosseous Needle Placement
0 Views •
2023
Source: Julianna Jung, MD, FACEP, Associate Professor of Emergency Medicine, The Johns Hopkins University School of Medicine, Maryland, USA For unstable patients requiring urgent administration of medications, fluids, or blood products, establishing vascular access quickly is essential. However, there are many factors that can complicate placement of a peripheral intravenous cannula (PIV), and it is extremely common for PIV attempts to fail. PIV placement may be technically challenging in small...
10:07
Using Fiberless, Wearable fNIRS to Monitor Brain Activity in Real-world Cognitive Tasks
0 Views •
Cited by 162 •
2015
Monitoring brain activity outside the lab without physical constraints presents methodological challenges. A fiberless, wearable functional Near Infrared Spectroscopy (fNIRS) system was used to measure brain activity during an ecological prospective memory task. It was demonstrated that this system could be used to monitor brain activity during non-lab based experiments.
10:36
fMRI Validation of fNIRS Measurements During a Naturalistic Task
0 Views •
Cited by 107 •
2015
We present a method to compare functional brain activity recorded during a naturalistic task using fNIRS with activity recorded during fMRI.
05:38
Custom-made Microdialysis Probe Design
0 Views •
Cited by 9 •
2015
Microdialysis is a commonly used technique in neuroscience research. Therefore commercial probes are in great demand.In this work a probe assembly is explained in detail to build a reliable, concentric, custom-made microdialysis probe for less than $10.
FAQs
Optode spacing and scalp contact directly influence whether a channel produces a usable signal. Spacing must be arranged so light-emitting and light-detecting optodes sample the intended scalp region, while stable contact helps limit signal loss. These choices matter because poorly positioned or poorly seated optodes can weaken measurements and complicate comparisons among targeted cortical areas.
Anatomical landmarks provide a common reference for placing channels over intended cortical regions. In fNIRS probe placement, this reference helps keep measurements aligned with functional anatomy rather than relying only on approximate scalp locations. Consistent landmark-based positioning is especially important when comparing participants, because similar channel locations make differences in measured blood-oxygenation changes easier to interpret.
Motion control is essential because movement can disturb scalp contact and introduce measurement artifacts. A displaced or unstable optode may reduce signal quality, making a recorded change harder to distinguish from an effect associated with the task. Maintaining stable placement and limiting movement therefore supports cleaner measurements during cognitive, sensory, or motor experiments.
Begin by identifying the cortical region and relevant anatomical landmarks, then arrange the light-emitting and light-detecting optodes over that target with appropriate spacing. Check scalp contact before recording and maintain motion control throughout the measurement. This sequence links the physical probe layout to the intended brain region while reducing avoidable signal loss and artifacts.
It is especially important when a study examines cognitive, sensory, or motor tasks and needs measurements assigned to particular cortical regions. Placement also becomes critical in comparisons across participants, where inconsistent channel locations can obscure whether differences reflect brain activity or probe positioning. Careful alignment improves the interpretability of task-related blood-oxygenation measurements.
Careful placement makes each measurement channel more meaningfully associated with a targeted cortical area and supports interpretation of changes in oxyhemoglobin and deoxyhemoglobin. It does not by itself eliminate signal loss or motion artifacts, so contact and movement remain important quality considerations. Together, these controls help researchers judge whether observed changes plausibly relate to the task.