Three dimensional analysis for trabecular patterns surrounding lesions using micro CT

为了在本项目中选择合适的X射线胶片，研究了爱克发OrthoLux(AO)、爱克发ST8G(AS)和柯达Ektavision(KE)绿色敏感全景X射线胶片与爱克发Ortho Regular 400(OR)柯达Ektavision(EV)和柯达Lanex Regular(LR)成像屏的感光特性和解剖结构的可视化。用H-D曲线、调制传递函数(MTF)和噪声当量量子数(NEQs)评价了全景X光胶片/增强屏组合的密度响应和分辨率。选定的解剖结构的清晰度由6名口腔和颌面部放射科医生独立评级。在胶片速度、空间分辨率、粒度和可感知的诊断图像质量方面，AO是一种改进。在分辨率、粒度和感知图像质量方面，AO-OR没有超过KE-EV。我们选择KE-EV组合收集一些病例，并尝试用Micro-CT扫描这些病例，但Micro-CT从X线片中收集图像数据困难，因此收集了有手术意向分离大小的新鲜颌骨，并清楚地描绘了与周围正常骨的边界。因此，在第二年的研究期间，只有促结缔组织增生性成釉细胞瘤满足这些条件。为了利用Micro CT描述该病例的三维骨小梁形态，我们收集了65kV，100μA的原始数据500条，每层厚22μ的切片图像数据600条。以及使用图像处理软件重建的三维图像。与正常颌骨的骨小梁形态比较，前者以骨小梁形态分隔骨髓腔较少。

To select an appropriate x-ray film in this project, the sensitometric properties and visualization of anatomical structures with, Agfa OrthoLux (AO), Agfa ST8G (AS) and Kodak Ektavision (KE) green-sensitive panoramic x-ray films used in combination with Agfa Ortho Regular 400 (OR) Kodak Ektavision (EV) and Kodak Lanex Regular (LR) imaging screens were researched. The density response and resolution of panoramic radiographic film/intensifying screen combinations was evaluated using H-D curves, modulation transfer functions (MTFs) and noise-equivalent number of quanta (NEQs). Imane clarity of selected anatomical structures were rated independently by six oral and maxillofacial radiologists. AO is an improvement over AS regarding film speed, spatial resolution, granularity and perceived diagnostic image quality. AO-OR did not exceed KE-EV regarding resolution, granularity and the perceived image quality. We selected KE-EV combination to collect some cases and tried to scan these film using micro CT, but collection of image data from x-ray film by micro-CT was difficult, so that fresh jaw with a disease to have intend for size of separating by operation, and to clearly describe a border with a circumference normal bone were collected. Consequently, only a desmoplastic ameloblastoma was satisfied these conditions by a study period in the second year. To describe the three dimensional trabecular patterns of this case using micro CT, we collected 500 pieces of raw data with 65 kV, 100 μ A, and made 600 pieces of slice image data with 22 μ thickness per one slice. And three dimensional image reconstructed using image processing software. Comparing the trabecular pattern between this case and normal jaw, the former separated the marrow cavity with trabecular patterns less than the latter.