Introduction to Presurgical Functional MRI
Functional magnetic resonance imaging (fMRI) is a modern, non-invasive imaging technique to measure and localize specific functions of the human brain without application of radiation (Bandettini et al. 1992; Kwong et al. 1992). Brain function is assessed indirectly with high spatial resolution via detection of local hemodynamic changes in capillaries (Menon et al. 1995) and draining veins (Frahm et al. 1994) of so-called “functional areas”, e.g. regions of the human brain that govern motor, sensory, language or memory functions. Here, specific stimulation of the respective neurofunctional system is required — spontaneous brain activity can not be measured. The blood-oxygen-level-dependent (BOLD) technique makes use of blood as an intrinsic contrast (Ogawa et al. 1990; Ogawa et al. 1992; Ogawa et al. 1993), rendering intravenous application of paramagnetic contrast agents (Belliveau et al. 1991) or radioactive substances unnecessary (Mazziotta et al. 1982; Raichle 1983; Fox et al. 1986; Holman and Devous 1992).
KeywordsFunctional Magnetic Resonance Imaging Blood Oxygenation Level Dependent Tional Magnetic Resonance Imaging Cognitive Brain Function Motor Hand
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