ABSTRACT
<p><b>OBJECTIVE</b>Surgery to reshape the nose with an implant has been a regular procedure for enhancing a patient's appearance and self-confidence. The purpose of this study was to establish a three-dimensional surgical simulation system. which can provide the patients with realistic prediction of their own postoperative appearance in computer and specifically produce a nose implant for an individual patient.</p><p><b>METHODS</b>Preoperative CT data and image-processing techniques were employed to generate a three dimensional template of the papatient' s face. Three-dimensional morphing processes were then applied to predict and compare the outcome of plastic procedures on a patient-specific nose surface, according to the patient' s expectation. By comparing and revising the changes before and after simulation, digital prototypes of the nose implants could be generated. The templates to create custom-made silicone implants were than produced by a computer controlled device.</p><p><b>RESULTS</b>Accurately regeneration of 3-D images and realistic operative simulations could be achieved with this system. The implants produced exactly conformed to the results of simulation. No curving and reshaping were needed during operating. The clinical results extremely matched with the simulations.</p><p><b>CONCLUSION</b>The system enhances surgeon-patient communication and facilitates preoperative planning. It is especially desirable for implant surgery with less guesswork of size, contour, and orientation of the implant. The best chance of optimal results could be achieved.</p>
Subject(s)
Adolescent , Adult , Female , Humans , Male , Computer Simulation , Imaging, Three-Dimensional , Nose , General Surgery , Prostheses and Implants , Plastic Surgery Procedures , MethodsABSTRACT
Objective To evaluate the CT findings of lymphofollicular thymic hyperplasia in adult myasthenia gravis (MG).Methods The CT findings of thymus area of 134 adult patients with lymphofolficular thymic hyperplasia in MG were reviewed,all of them with surgically and histologically proven diagnosis,and compared with the CT findings of 165 normal subjects.Results In the group of patient,CT showed enlargement of thymus in 31 patients,5 patients had nodule or mass(＜3 cm);thus 36 cases(26.9%)can confirmed diagnose by CT with thymic hyperplasia.CT showed 2 masses(＞3 em) and 9 patients(6.7%)had normal size thymus with soft-tissue density,it can considered with thymic hyperplasia.The spotty or streak shadow showed in other patients,though it could not be certain diagnosed as thymic hyperplasia,but could not be except it.The thymus area tissue complete replacement by fatty density were not found in patient group.The CT findings of patients had marked difference when compared with group of normal subjects(P＜0.01),except the spotty or streak shadows.Conclusion CT scan is an important method in diagnosing thymic lymphofollicular hyperplasia of MG in adult.