Meeting Banner
Abstract #2203

Influence of Orientation of the Draining Vein in FMRI

Toru Yamamoto1, Hiroharu Kubota2

1Faculty of Health Sciences, Hokkaido University, Sapporo, Hokkaido, Japan; 2Graduate School of Health Sciences, Hokkaido University, Sapporo, Hokkaido, Japan

Conventional fMRI involving gradient-echo EPI is mainly influenced by the magnetic distortion around the draining vein from the activation area. This distortion depends on the angle between the draining vein and the static magnetic field in MRI (). To investigate how the activation area is influenced by the angle between the draining vein and the static magnetic field, we performed the same fMRI study for different head positions in an RF coil by tilting the volunteers head. We found that the activation area, especially the position of the largest signal increase, shifted superiorly along the draining vein when increased.

Abstract PDF Poster PDF

Keywords

activated activation actually alter although approaches around arrow arrows balance blood blue body bold brain central clearly coil condition considered contrast contribution cortex dashed defined depends depicted depiction determined deviate diamond differs displacement distance distortion draining electromagnetic especially every experiment experimental explained faculty field finger fitting flair focus gradient graduate green head health hence horizon indicates inferior influence influenced influences intra investigate involving japan larger largest leftward located location mainly materials measured model modeled motor neurons normalized opposition orient orientation origin oxygenation percentile pertaining position positioned positions quantitative quantitatively ranging remote repeated represent resting rightward scanner school sciences side static strongly studied subjects successfully superior superiorly surface tapping tends theoretical theory tilted tilting true underwent vein veins volunteer volunteers ways whole