| Summary: | 碩士 === 南台科技大學 === 電機工程系 === 99 === Eyes and its associated structures are important not only for vision but also for facial beauty. In Taiwan, orbital blow-out fractures are frequent due to popularity of motorcycle traffic accident. Recognized sequelae of orbital blow-out fracture include enophthalmos, diplopia from extraocular muscle dysfunction (entrapment, ischemia, hemorrhage, nerve injury), dystopia and disfiguring facial contours. There are still many clinical issues needed to be resolved. At early stage of orbital trauma, severe swelling of orbital structures makes the diagnosis and indications for reconstructive surgery difficult. The orbital and facial structure of normal side is always to be the reference in reconstructive surgery plan. Although computed tomography(CT) evaluation is popular, objective clinical examination combined with imaging study is lack. A lot of uncontrolled, non-comparative retrospective case series have been published. However, this lack of clear data as a result makes the orbital reconstruction controversial. Even the adequacy of using normal orbit as reconstruction reference for the injured side is unknown. We first reform a 3-D orbit CT model and set some mathematic geometric parameters to define the relationship of eyeball and orbital structure. By using 3-D CT reformation, structures in the orbital cavity including the eyeball, soft tissues and bony walls can be segmented from the sequential CT images, and then the algorithms of computer graphics can be implemented for 3D model reconstruction. In this study, we investigate the anatomic characteristics and investigate the symmetry of normal orbits. The associated database for Taiwanese can be established while enough cases can be collected and measured. In the future, we hope the system can be applied for the prediction of surgical results to facilitate the management procedure and improve the quality for reconstructive surgery.
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