歯科領域における高速らせんCTの応用

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The use of Spiral CT, a new volume scanning method, for the dentistry was reviewed with images obtained using the Spiral CT scanner in Kagoshima University Dental hospital. Spiral CT allows the high speed continuous volume data acquisition and make it possible to use CT images for the dentistry which needs high resolution images of vertical planes to the jaw bone in addition to the conventional transaxial images. Multiple-planner-reconstruction and Dental CT clearly pointed out the relations between the teeth and mandible canal or that between the cyst and the canal. The three dimensional images is gaining higher and higher acceptance including many misunderstands also in the dentistry alike the past medical fields. The fundamental difference between the three dimensional images used in the movie and medical imaging were described briefly. The principal of the two types of the three dimensional imaging for medical fields, the surface rendering and the volume rendering, were also written. The application for the periodontal surgery using three dimensional images were presented as a good example for the both methods. Rapid prototyping, which is a new technology in the medical field, was described with the concept about accuracy that also same in the three dimensional imaging. The patient dose and the method to reduce the risk were discussed. Image quality of the bone is not so dependent in the Xray tube currents, so we can reduce the tube current to 85mA and only 48mm length scan were requested for a jaw bone. These fac-tor lead to the effective dose 0.3-0.4mSv at maximum. The use of the Spiral CT can be justify for some cases such as the dental implants or periodontal surgery if the patients state (age, will, etc.) and scanning parameters are well considered.
鹿児島大学の論文
1997-03-25

歯科領域における高速らせんCTの応用

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