Perfusion weighted imaging- A variety of MRI techniques used to measure blood flow and volume within the brain and generate maps about this perfusion of blood within the brain.
Glossary
WP Glossary
PXA
Pleomorphic Xanthoastrocytoma – a rare glial tumor occurring mostly in the supratentorial brain and having a very indolent behavior.
QOL
Quality Of Life
RAGE
RApid Gradient Echo is a echo gradient MRI sequence used for a wide range of applications including angiography and perfusion techniques.
Rankin Scale
A clinical assessment tool designed to define the degree of disability present after a stroke or other neurologic injury. The scale runs from 0-6 with 0=no disability and 6=dead. 1-2 is a mild disability, 3-4 a moderate disability and 5 a severe disability,.
rapamycin
sirolimus (Trade name Rapamune) – a mTOR pathway inhibitor that suppresses the growth of SEGAs.
RAS
reticular activating system or reticular system – the system within the brain responsible for arousal. It consists of the reticular formation within the midbrain and its connections to modulating relays going through the hypothalamus and thalamus to the cortex of the cerebrum.
RBC
Red blood cell (aka erythrocyte). The predominant cell in blood whose main function is to carry oxygen from the lungs throughout the body.
Recombinant
Recombinant: Refers to genetic material (DNA, RNA, protein, etc.), cell or organism that results from the combination of DNA segments from different organisms.
RED
Rigid External Device – descriptive term referring to an external frame fixed to the skull and midface. This apparatus is used to pull the midface out to the desired location after it has been surgically detached from the skull’s base.
