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Abstract #0509

Revisit Nonlinearity in Blood-Oxygenation-Level-Dependent Signal

Nanyin Zhang1, Essa Yacoub1, Xiao-Hong Zhu1, Kamil Ugurbil1, Wei Chen1

1Radiology, University of Minnesota, Minneapolis, MN, USA

Literature studies suggest that there are significant nonlinear characteristics in the BOLD signal in response to evoked neuronal activity. We demonstrated previously that when eliminating contributions from large vessels, the nonlinearity in the BOLD signal becomes much less significant. In this study we have investigated (non)linear characteristics of the BOLD signal from the microvasculature using a combination of SE fMRI and a paired-stimulus paradigm. We found that that SE BOLD signal acquired at high magnetic fields, which is sensitive mainly to the microvasculature, is primarily a linear system.