Technical Note: PDF OnlyNasal Orientation Device to Control Head Movement during CT and MR StudiesTofts, Paul S.; Kermode, Allan G.; MacManus, David G.; Robinson, W. H. Author Information From the Multiple Sclerosis NMR Research Group, Institute of Neurology, Queen Square, London WC1N 3BG, England. Journal of Computer Assisted Tomography 14(1):p 163-164, January 1990. Buy Abstract Cooperative patients can often keep still during a long examination of the brain provided that they are given cues about their position in space. In a U-shaped head support, the only movements likely are rotation in the sagittal or transverse planes. These can be detected by a nasal orientation device (NOD), simply a ring around the nose, close but not touching. Any unintentional movement is felt on the nose by the patient, who can return to the original (nontouching) position. With this device the patient can keep immobile to within approximately ±2 mm during long examinations. We have used the NOD to improve the quality of dynamic Gd-DTPA scanning for the measurement of blood–brain barrier permeability. The NOD can be of value in any neurological imaging procedure that is currently degraded by head movement. © Lippincott-Raven Publishers.
