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Abstract #1594

Relationship Between Respiratory Variations and End-Tidal CO2 in BOLD FMRI Physiological Noise

Catie Chang1, Gary H. Glover1,2

1Electrical Engineering, Stanford University, Stanford, CA, USA; 2Radiology, Stanford University, Stanford, CA, USA

One major source of fMRI physiological noise relates to variations in respiration depth and rate. It has been shown that respiratory variations (RVT), computed from pneumatic belt measurements of chest expansion during breathing, explains significant variance in fMRI timeseries. While RVT is believed to relate to arterial CO2, a vasodilator, the relationship between RVT and CO2 as well as their