T2* Mapping for TE Optimization in fMRI at Different Field Strength

Erb, M; Klose, U; Grodd, W

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T2* Mapping for TE Optimization in fMRI at Different Field Strength

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https://cds.ismrm.org/ismrm-2003/ismrm03.pdf
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Erb, M., Klose, U., & Grodd, W. (2003). T2* Mapping for TE Optimization in fMRI at Different Field Strength. Poster presented at 11th Scientific Meeting of the International Society of Magnetic Resonance in Medicine (ISMRM 2003), Toronto, ON, Canada.

引用: https://hdl.handle.net/21.11116/0000-0005-8146-A

要旨

Changes in oxygenated and deoxygenated haemoglobin proportions during brain activation causes susceptibility changes (T2*) and give rise to the so-called BOLD effect. The maximum of BOLD effect can be obtained at echo times corresponding to the mean T2* in each voxel. As the BOLD signal is at the same time field strength dependent it will increase with B0 [1]. We calculated T2* maps at 1.5T and 3T and found a decrease of 20ms between the main peaks in the T2* histograms (65ms/45ms). The amplitudes of BOLD effect at optimised echo times increased by 2.4 in the motor area.