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MR Evaluation of the Olfactory Bulb in Normals and Patients with Decreased Sense of Smell
양경훈,김만익,문우보,김익태,박영민,임현준,이율 대한비과학회 1998 Journal of rhinology Vol.5 No.1
To evaluate changes in olfactory bulb size in patients with reduced or no sense of smell, 23 normals and 20 hyposmics or anosmicswere examined with nasal endoscopy, olfactory testing and magnetic resonance imaging (MRI) of the olfactory bulb. Olfactory testing consisted of a threshold test by bounded three-alternative forced-choice modified ascending method of limits(CCCRC test) and the step method using threefold dilutions of 1-butanol and an olfactory identification test using 32 natural odorsfamiliar to Koreans. The MR evaluation involved the estimation of olfactory bulb size by using a 13 cm diameter general purposesurface coil with 3 mm T1-weighted MR coronal sections without interval. The cut areas of the olfactory bulb in MR coronalsections were measured with a Hope Graph Planimeter (model No. 9-003) after fivefold enlargement. The olfactory bulb wasobserved in three cuts of MR imaging in all subjects. In the measured area of the olfactory bulb, the anterior portion of the olfactorybulb was significantly smaller than the middle and posterior areas in normals, but hyposmics or anosmics showed decreasedolfactory bulb area, especially in height, when compared with normals. There was good correlation between olfactory bulb areaand olfactory threshold as well as olfactory identification in normals and patients. MR imaging can be a useful tool for patientswith hyposmia or anosmia.