Reliability of Near-Infrared Spectroscopy in People With Dark Skin Pigmentation

Wassenaar, Eelco B.; Brand, Johan G. H. van den

doi:10.1007/s10877-005-1655-0

Cited by 101 publications

(81 citation statements)

References 23 publications

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“…Reasons for the observed failure to obtain sufficient signal may be hair color as well as dark skin pigmentation in one of the subjects. It is further known that there are still unsolved inter-individual anatomical and/or physiological differences occurring in NIRS which may lead to failure of sufficient signal (Hiroki et al, 2005, Wassenaar andVan den Brand, 2005).…”

Section: Subjectsmentioning

confidence: 99%

Task complexity relates to activation of cortical motor areas during uni- and bimanual performance: A functional NIRS study

Holper

Biallas²,

Wolf³

2009

NeuroImage

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Task complexity relates to activation of cortical motor areas during uni-and bimanual performance: a functional NIRS study Holper, L; Biallas, M; Wolf, M Holper, L; Biallas, M; Wolf, M (2009 AbstractHand motor tasks are frequently used to assess impaired motor function in neurology and neurorehabilitation. Assessments can be varied by means of hand laterality, i.e. unimanual or bimanual performance, as well as by means of task complexity, i.e. different degrees ranging from simple to complex sequence tasks. The resulting functional activation in human primary motor cortex (M1) has been studied intensively by traditional neuroimaging methods.Previous studies using functional near-infrared spectroscopy (fNIRS) investigated simple hand motor tasks. However, it is unknown whether fNIRS can also detect changes in response to increasing task complexity. Our hypothesis was to show that fNIRS could detect activation changes in relation to task complexity in uni-and bimanual tasks.Sixteen healthy right-handed subjects performed five finger-tapping tasks: unimanual left and right, simple and complex tasks as well as bimanual complex tasks. We found significant We report for the first time that fNIRS detects oxygenation changes in relation to task complexity during finger-tapping. The study aims to contribute to the establishment of fNIRS as a neuroimaging method to assess hand motor function in clinical settings where traditional neuroimaging methods cannot be applied.

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Section: Subjectsmentioning

confidence: 99%

Task complexity relates to activation of cortical motor areas during uni- and bimanual performance: A functional NIRS study

Holper

Biallas²,

Wolf³

2009

NeuroImage

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“…Near-infrared spectroscopy relies on the principle that light, at a wavelength 650 -1000 nm, passes readily through skin and subcutaneous tissue however is absorbed by chromophores such as Hb, cytochrome oxidase and melanin 73 . Given this phenomenon, it would seem that the degree of skin pigmentation would have a significant effect on the reported rSO 2 value, in that the darker and more pigmented the skin, the more the NIRS signal would be impeded.…”

Section: Discussionmentioning

confidence: 99%

“…Given this phenomenon, it would seem that the degree of skin pigmentation would have a significant effect on the reported rSO 2 value, in that the darker and more pigmented the skin, the more the NIRS signal would be impeded. Wassenaar et al (2005) reported a loss of signal when using NIRS on human patients with very dark skin; however the sample size was deemed too small to quantify the effect 73 . Alternatively, in a study performed on calf skulls, no significant difference in NIRS signal was observed when the probe was placed over black or white skin, nor was there a detectable difference in rSO 2 values when the skin was removed from the skull 74 .…”

Section: Discussionmentioning

confidence: 99%

Use of near‐infrared spectroscopy to identify trends in regional cerebral oxygen saturation in horses

McConnell

Rioja

Bester

et al. 2012

Equine Veterinary Journal

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Summary Reasons for performing study Alterations in cerebral haemodynamics may contribute to perianaesthetic complications in horses. Near‐infrared spectroscopy (NIRS) is frequently used intraoperatively in man to provide information regarding cerebral perfusion. Objectives To determine whether NIRS can identify trends in regional cerebral oxygen saturation (rSO2) in horses and whether there is a correlation between rSO2 and venous oxygen tensions. Methods A cerebral oximeter sensor recorded rSO2 from the dorsal sagittal sinus of 6 healthy horses. Values for rSO2, arterial and venous oxygen and carbon dioxide tensions (PaO2, PvO2, PaCO2 and PvCO2 respectively), along with arteriovenous oxygen saturations (SavO2) were recorded in unsedated (recording period [RP] 1), sedated (RP2) and anaesthetised horses (RP3–5) and during recovery (RP6–8). During anaesthesia, horses were ventilated to achieve states of normo‐ (RP3), hyper‐ (RP4) and hypocapnoea (RP5). Data were evaluated descriptively and analysed using linear mixed‐effects models and Pearson's correlation coefficient. Results Overall mean ± s.d. values for rSO2, PaO2, PvO2, PaCO2, SavO2 and mean arterial pressure varied significantly by RP (P<0.001). Significant decreases in rSO2 were identified between RP1 and the post anaesthetic periods (P<0.001). No significant differences in rSO2 values were identified between RP1 and the intra‐anaesthesia periods or between RP3, RP4 and RP5. Significant correlations were identified between rSO2 and PaO2 (r = 0.448, P<0.001), rSO2 and PvO2 (r = 0.512, P<0.001) and rSO2 and SavO2 (r = 0.469, P<0.001). Conclusions This is the first study to identify trends in rSO2 in horses using NIRS. A positive correlation was identified between rSO2 and PvO2, suggesting that alterations in cerebral oxygenation may be reflected in PvO2. Potential relevance Near‐infrared spectroscopy may be used to monitor trends in rSO2 during equine anaesthesia. Decreasing rSO2 values may act as an early warning signal, alerting clinicians to potential cerebral desaturation events and indicating a need for intervention.

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“…In patients with dark skin pigmentation, the blood oxygen saturation should be interpreted with caution, as melanin clearly interferes with the quality of the reflected NIRS signal. 9 For emulating the effect, India Ink is applied as an absorber to control the phantom tissue' absorption coefficient. In addition, gelatine is chosen as the coagulator to simulate tumor tissue.…”

Section: Experiments and Analysismentioning

confidence: 99%

“…As skin color is also determined by the presence of chromophores, it is plausible that NIRS signal quality may be affected by dark skin pigmentation. 9 Considering this phenomenon, a phantom experiment is implemented, which use Intralipid and India Ink to simulate the absorbance and scattering of NIRS light respectively. The experimental result shows that the proposed device is able to measure the absorption coefficients of the phantom tissue and the blood oxygen saturation, so that the concerned canceration case can be detected.…”

Section: Introductionmentioning

confidence: 99%

Tissue phantom-based breast cancer detection using continuous near-infrared sensor

et al. 2016

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Women's health is seriously threatened by breast cancer. Taking advantage of efficient diagnostic instruments to identify the disease is very meaningful in prolonging life. As a cheap noninvasive radiation-free technology, Near-infrared Spectroscopy is suitable for general breast cancer examination. A discrimination method of breast cancer is presented using the deference between absorption coefficients and applied to construct a blood oxygen detection device based on Modified Lambert-Beer theory. Combined with multi-wavelength multi-path near-infrared sensing technology, the proposed method can quantitatively distinguish the normal breast from the abnormal one by measuring the absorption coefficients of breast tissue and the blood oxygen saturation. An objective judgment about the breast tumor is made according to its high absorption of near-infrared light. The phantom experiment is implemented to show the presented method is able to recognize the absorption differences between phantoms and demonstrates its feasibility in the breast tumor detection.

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Reliability of Near-Infrared Spectroscopy in People With Dark Skin Pigmentation

Abstract: In patients with a dark pigmented skin, NIRS StO2 measurements should be interpreted with caution, as melanin clearly interferes with the quality of the reflected NIRS signal.

Cited by 101 publications

References 23 publications

Task complexity relates to activation of cortical motor areas during uni- and bimanual performance: A functional NIRS study

Task complexity relates to activation of cortical motor areas during uni- and bimanual performance: A functional NIRS study

Use of near‐infrared spectroscopy to identify trends in regional cerebral oxygen saturation in horses

Tissue phantom-based breast cancer detection using continuous near-infrared sensor

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