Detection of very low-frequency oscillations of cerebral haemodynamics is influenced by data detrending.

Abstract:

:Recent studies were investigated that report spontaneous oscillations of cerebral perfusion in the very low-frequency range (0.01-0.04 Hz), emphasising details of spectral estimation. The effects of different spectral estimation procedures were compared, using simulated and clinical data. It was shown that data detrending, as used in many studies, can lead to an artifactual peak in the very low-frequency region of estimated power spectra, indicating that the peak cannot be taken as evidence of physiological oscillations. A quantitative, reliable method is described that can be used to assess very low-frequency oscillations. Using the method, very low-frequency oscillations were found in ten out of 17 healthy adults measured with transcranial Doppler (average frequency, 0.021 +/- 0.007 Hz, mean +/- SD), confirming earlier findings based on visual inspection of data.

journal_name

Med Biol Eng Comput

authors

Müller T,Reinhard M,Oehm E,Hetzel A,Timmer J

doi

10.1007/BF02343541

keywords:

subject

Has Abstract

pub_date

2003-01-01 00:00:00

pages

69-74

issue

1

eissn

0140-0118

issn

1741-0444

journal_volume

41

pub_type

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