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Spectral analysis of near-infrared spectroscopy signals measured from prefrontal lobe in subjects at risk for stroke
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10.1118/1.3696363
/content/aapm/journal/medphys/39/4/10.1118/1.3696363
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/4/10.1118/1.3696363

Figures

Image of FIG. 1.
FIG. 1.

Schematics of tissue oxygenation detection with two detectors.

Image of FIG. 2.
FIG. 2.

(a) Raw [HbO2] data, (b) the corresponding wavelet transform in the time-frequency plane and (c) the averaged spectrum of NIR signal shown on a log scale. The vertical lines indicate the outer limits of the frequency interval: (I) 0.005–0.02 Hz, (II) 0.02–0.06 Hz, (III) 0.06–0.15 Hz, (IV) 0.15–0.4 Hz, and (V) 0.4–2 Hz, which correspond to endothelial-related metabolic, neurogenic, myogenic, respiratory and cardiac activities, respectively.

Image of FIG. 3.
FIG. 3.

Comparison of the amplitudes of cerebral NIR signal (a) [Hb], (b) [HbO2] and (c) [tHb] in the five frequency intervals between the normal subjects and the subjects at risk for stroke. (I) 0.005–0.02 Hz, (II) 0.02–0.06 Hz, (III) 0.06–0.15 Hz, (IV) 0.15–0.4 Hz, (V) 0.4–2 Hz. Significant differences are labelled between normal and risk *p < 0.05, **p < 0.01.

Tables

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TABLE I.

Characteristics of participants.

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/content/aapm/journal/medphys/39/4/10.1118/1.3696363
2012-03-29
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spectral analysis of near-infrared spectroscopy signals measured from prefrontal lobe in subjects at risk for stroke
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/4/10.1118/1.3696363
10.1118/1.3696363
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