Mri Glossary
نویسنده
چکیده
BOLD Effect (Blood Oxygen Level Dependent Effect) The change in T ∗ 2 that is caused by changes in the amount of oxygenated hemoglobin in the venous circulation of the brain. Because oxygenated hemoglobin has a much smaller magnetic susceptibility than deoxygenated hemoglobin, and because neural activity causes a change in the amount of oxygenated hemoglobin in the venous blood, the magnetic susceptibility of blood decreases during activation. Thus, its T ∗ 2 increases, and hence there is an increase in intensity in T ∗ 2 -weighted images.
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تاریخ انتشار 2001