Usefulness of 3D Facial Bone CT in Facial Trauma with 64-channel MDCTJin Young Lee1, Hyung Suk Seo1, Yup Yoon11Department of Radiology, Dongguk University International Hospital, Korea

BACKGROUND: Non-multidetector (MD) CT with only axial images has the diagnostic limitation in facial bone fracture, such as simple transverse nasal bone fracture, and can not replace the simple radiography. In recent years, 64-channel MDCT has offered the isovoxel image and can generate excellent 3-dimensional (3D) image from conventional 2-dimensional data. The 3D facial bone image with 64-channel MDCT improved the diagnoses of various facial bone fractures in comparison with conventional axial image and completely replaced the simple radiography.KEY ISSUES: The majority of nasal bone fracture was simple transverse fracture without displacement. Therefore, sagittal maximum intensity projection (MIP) CT image could easily diagnose it, although axial and coronal images were hard to find it. Sagittal and coronal images were useful in detection of mandibular, maxillary and orbital bone fractures. In addition to facial bone fracture, temporal mastoid, occipital condylar and cervical spinal avulsion fractures were superior in diagnostic accuracy to axial image. volume rendering (VR) image allowed a better understanding of anatomical relationship and a surgical plan for effective correction.FORMAT: This exhibit will present the sagittal and coronal MIP CT images which were useful diagnostic tool in facial trauma with corresponding axial CT image and simple radiography. VR image which was helpful in surgical correction of fracture will be presented.

TEACHING POINTS: 1. Recognize the usefulness of 3D facial bone CT in facial trauma. 2. Especially, Recognize the usefulness of sagittal MIP in diagnosis of nasal bone fracture. 3. Get the knowledge of clinical use of 3D image.