Methods and findings of target image CT of olfactory clefts and ethmoid cells of the patients suffered from olfactory disturbance were presented with clinical cases, and the importance of target image CT was discussed. Scannings were made bidirectionary, coronary view and axial view. Five cases with olfactory disturbance such as parosmia, cacosmia, hyposnia caused by commoncold and anosmia caused by chronic sinusitis were presented. Anatomy of ethomoid cells and olfactory clefts was very complicated and mechanisms of olfactory disturbance have not been completely proved, therefore better resolution of target image CT than the conventional methods and observations from two directions could provide more precise and three dimentional information. This examination was very useful for the diagnosis of the place and the degree of the pathological change causing olfactory disturbance. Furthermore, when the endonasal surgery was applied to the treatment of the disease, the evaluation of the local anatomy by CT was very important.
