Vol.95 No.7 contentsPRACTICA OTO-RHINO-LARYNGOLOGICA
Vol. 95 No. 7 July 2002
Investigation of Reconstruction Conditions in Sagittal-Plane
Multiplanar Reconstruction of the Temporal Bone
Miyako Suzuki
(Yanagibashi Hospital)
Hiroshi Yoshikawa, Akira Hosokawa, Kenichi Kobayashi and Ginichiro Ichikawa
(Juntendo University)
Ichiro Ando
(Juntendo University Urayasu Hospital)
In recent years, it has become possible to quickly obtain a large amount of 3D data with high continuity by helical CT scanning, in which the body is scanned continuously in a helical fashion.
MPR (multiplanar reconstruction) can be performed using this data to generate images in arbitrary sectional planes, making it possible to obtain sagittal-plane images of the highest quality, which is useful for surgical planning. However, the procedures involved are rather complicated. Therefore, this study was conducted to investigate conditions for standardization of sagittal-plane MPR examinations performed using Xvigor CT scanners and Xtension. The results showed that a slice interval of 1 mm, no imaging filter, a zooming factor of 1.5, a window level of 350, and a window width of 3500 are the optimal imaging conditions. The stapes can be visualized in 70％ of cases with sagittal-plane MPR based on axial images, and can be recognized at surgery in 75％ or more of cases. Images of consistent quality can be obtained by standardizing the conditions for sagittal-plane MPR, which should prove advantageous in the clinical setting.
Key words : temporal bone, sagittal-plane multiplanar reconstruction (MPR), helical CT