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- W811899903 abstract "The relaxation rates R2* (left) and R2 (right) due to extravascular BOLD as a function of susceptibility of the blood vessel are shown for vessel radius 3µm (red), ~6µm (blue) and ~20µm (black) corresponding approximately to radii of capillary, venule and veins. The x-axis is shown in units of (χ0⋅0.05⋅1.5T⋅0.02), i.e. each unit corresponds to 5% deoxy-Hb content at 1.5T field strength with 2% blood volume relative to tissue volume. With the use of these units, the plots can be easily read for other magnetic fields; for example, at 3T each unit would correspond to 2.5% deoxy-Hb content with 2% blood volume relative to tissue volume). For GRE sequences the relaxation rates of venules and veins are larger than that of capillaries for all χ (i.e. oxygenations and field strengths). In contrast, for SE sequences the venule sized cylinders have the higher relaxation rate at low χ values, and the capillaries at high χ values. These curves were fitted with a polynomial of 5th order to obtain an accurate analytical expressions for R2* and R2, i.e. R2* or R2 = (a⋅x+b⋅x 2 +c⋅x 3 +d⋅x 4 +e⋅x 5 )⋅χ0. In the table, all coefficient were divided by a factor of 10 000." @default.
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- W811899903 date "2007-05-01" @default.
- W811899903 modified "2023-10-12" @default.
- W811899903 title "Extravascular BOLD Effect for Different Size Blood Vessels Over a Large Range of Magnetic Fields" @default.
- W811899903 hasPublicationYear "2007" @default.
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