1 Understand that hepatitis B vaccination-induced protective antibodies can last for up to 15 years, but appear to fall off over time.  Patients who were vaccinated 10 to 15 years ago, especially those who were vaccinated as children, may not be adequately protected. For patients with this history who are at moderate to high risk of hepatitis B infection consider quantitative hepatitis B antibody measurement to determine protective immunity.
Definition of thickness. 1 : the smallest of three dimensions length, width, and thickness. 2 : the quality or state of being thick. 3a : viscous consistency boiled to the thickness of honeyb : the condition of being smoky, foul, or foggy. 4 : the thick part of something. 5 : concentration, density.
[ edit intro ]. In neuroanatomy, cortical thickness is a brain morphometric measure used to describe the combined thickness of the layers of the cerebral cortex in mammalian brains, either in local terms or as a global average for the entire brain.n the living brain, cortical thickness is commonly determined on the basis of the grey matter set in segmented neuroimaging data, usually from the local or average distance between the white matter surface and the pial surface. It changes only minimally with brain size, both within and across species.