Dunn S M, van der Stelt P F
New Jersey Dental School, Newark.
Dentomaxillofac Radiol. 1992 Aug;21(3):142-7. doi: 10.1259/dmfr.21.3.1397469.
The dental radiograph is a non-invasive tool that is used to view internal structures for the diagnosis of caries, periapical lesions and periodontal disease. The requirement for a standardized image is most prominent in periodontal disease since the diagnosis is best done with a difference radiograph. The difficulty is that exact registration for subtraction requires exact reproduction of imaging geometry. A new model of imaging geometry, based on the correspondence of 3D structures, to describe the radiograph formation process is presented. The experimental results show that 3D measurements can be made in dental radiographs (P < 0.01) with up to 16-mm translation errors and angulation errors of up to 32 degrees.
牙科X光片是一种非侵入性工具，用于观察内部结构以诊断龋齿、根尖周病变和牙周疾病。由于使用差异X光片进行诊断效果最佳，因此在牙周疾病中对标准化图像的要求最为突出。难点在于减法运算的精确配准需要成像几何结构的精确再现。本文提出了一种基于三维结构对应关系的新型成像几何模型，用于描述X光片的形成过程。实验结果表明，在牙科X光片中，平移误差高达16毫米、角度误差高达32度时仍可进行三维测量（P < 0.01）。
