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Valsalva maneuver, modified Valsalva maneuver, 그리고 저자들이 고안한 " modified breath holding" 밤법시 spiral CT를 시행하여 영상을 얻고 적절한 시행 방법을 알아 보았다. 그리고 후두병번이 있는 20 엽의 환자를 대상으로 quiet breathing 시에 영상을 먼저 얻고， 추가적으로 new " modified breath holding" 방법을 이용한 영상을 얻는 두 차례의 스캔을 시행하고， 영상을 분석하였다.

Simulated three-dimensional (3D) imaging represents reformation of conventional sectional imaging data into a series of images that closely resemble the original studied structure.We tried to make 3D mucosal surface images of the sinonasal cavities, phaηnx and larynx, and evaluated the feature of normal anatomy in 28 subjectsIn the sinonasal cavities, 3D imaging was capable of demonstrating the inner wall of paranasal sinuses and its openings, and general status of the nasal cavity. In the nasopharynx, 3D imaging provided an easy concept of sectional images as 3D picture and displayed anatomic subsites and lesions comparable to that in fiberscope.In addition, 3D imaging had advantages in overcoming the technicallimitations in fiberscope . In the laπnx and hypophaηnx ， 3D imaging gave a 3D concept of the laπngeal structures and presented additive informations not seen 10 때aliam맑s thus enabling access to regions beyond the scope of fiberscope.In conclusion, 3D imaging allows an easy conceptu떠ization of transaxial CT images in complex anatomic areas and provides additional informations undetectable in transaxial CT. We believe that the spaces of the sinonasal cavities, phaηnx and laπm' would be a new field of application of 3D image

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