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Comparison between end-tidal CO₂ and respiration volume per time for detecting BOLD signal fluctuations during paced hyperventilation.

Abstract：

:Respiratory motion and capnometry monitoring were performed during blood oxygen level-dependent (BOLD) functional magnetic resonance imaging (fMRI) of the brain while a series of paced hyperventilation tasks were performed that caused significant hypocapnia. Respiration volume per time (RVT) and end-tidal carbon dioxide (ETCO(2)) were determined and compared for their ability to explain BOLD contrast changes in the data. A 35% decrease in ETCO(2) was observed along with corresponding changes in RVT. A best-fit ETCO(2) response function, with an average initial peak delay time of 12 s, was empirically determined. ETCO(2) data convolved with this response function was more strongly and prevalently correlated to BOLD signal changes than RVT data convolved with the corresponding respiration response function. The results suggest that ETCO(2) better models BOLD signal fluctuations in fMRI experiments with significant transient hypocapnia. This is due to hysteresis in the ETCO(2) response when moving from hypocapnia to normocapnia, compared to moving from normocapnia to hypocapnia.

journal_name

Magn Reson Imaging

journal_title

Magnetic resonance imaging

authors

Vogt KM,Ibinson JW,Schmalbrock P,Small RH

doi

10.1016/j.mri.2011.07.011

subject

Has Abstract

pub_date

2011-11-01 00:00:00

pages

1186-94

issue

9

eissn

0730-725X

issn

1873-5894

pii

S0730-725X(11)00241-4

journal_volume

29

pub_type

杂志文章

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