アブミ骨の3次元CT画像

乾燥側頭骨での基礎的検討と臨床応用

抄録

This study was performed to evaluate the usefulness and limitations of three dimensional (3-D) imagings of stapes in the middle ear by high speed helical CT.
One dissected human temporal bone, ten normal and diseased ears were scanned with a slice of 1.0mm and reconstructed in a thickness of 0.2-0.5mm.
Every specimen of 3-D CT can be observed in any plane and from any direction. Ossicular imagings of the temporal bone in 3-D CT were reconstructed as if the malleus, incus and stapes were observed under microscope. The whole structure of stapes was impossible to be represented by two dimensional CT heretofore in use, but 3-D CT in our study showed the head, crus and foot plate of the stapes in detail.
Stapedial imagings of 3-D CT in normal ears showed the same findings as those recorded in temporal bone. Preoperative diagnostic findings of ossicles in the affected ears were very usefull. Especially in ossicular anomalies, 3-D CT was positive in diagnosis and its accuracies were confirmed with operative observation. For the postoperative evaluation concerning the ossicular reconstruction, i.e, TORP and PORP, 3-D CT was also important method. It could present an anatomical relation between those prosthesis and the oval window.
High speed helical CT can scan an object more quickly and clearly than formerly used CT, and its biological damage for human is less than that of the others. 3-D CT can be more clearly reconstructed with helical CT than former CT.