RADIOGRAPHIC DIFFERENTIAL DIAGNOSIS IN DENTAL REGION USING EXPERT SYSTEM

放射科医师根据x光片的定性特征进行放射鉴别诊断。对于这类诊断，计算机辅助诊断（CAD）系统被视为一种工程方法。牙髓性囊肿、牙源性角化囊肿和成釉细胞瘤是颌面部常见的疾病，但其治疗方法各不相同。尽管他们的症状彼此相似，但有必要做出准确的鉴别诊断。作为一项初步研究，我们研究了使用逻辑回归和神经网络的统计方法。在这些研究下，Kodera在1995年7月的第12届日本医学物理协会年会上提出了“用神经网络和统计分析在口腔放射学中的鉴别诊断”。1995年9月，Ohtani在第36届日本口腔颌面放射学会年会上发表了“利用统计方法和神经网络对牙源性囊肿、牙源性角化囊肿和成釉细胞瘤的放射鉴别诊断”。在这些结果的基础上，我们于1996年构建了系统并积累了数据。1996年9月，Kodera在第37届日本口腔颌面放射学会年会上以“利用专家系统在牙科领域的放射鉴别诊断”为先发表。最后，我们对广岛大学开发的系统进行了临床评估，即牙医对这些方法的有效性进行了评估和确认。将本研究提出的方法应用于牙齿图像的其他区域。

Radiologists performed radiographic differential diagnosis from qualitative features in radiogram. For this kind of diagnosis, computer-aided diagnostic (CAD) system is watched as one of an engineering approach. Dentigerous cyst, odontogenic keratocyst and ameloblastoma in maxillofacial region occur frequently, but their recuperations are different. Then it is necessary to make an exact differential diagnosis, although their symptoms are similar to one another. As a pilot study, we investigated statistical methods using a logistic regression and neural network. Under these studies, Kodera presented as "Differential diagnosis by neural network and statistical analysis in oral radiology" in the 12th Annual Meeting Japanese Association of Medical Physics in July 1995. And, Ohtani presented as "Radiographic differential diagnosis among dentigerous cyst, odontogenic keratocyst and ameloblatoma using statistical methods and neural network" in the 36th Japanese Society for Oral and Maxillofacial Radiology Annual meeting in September 1995. Based on these results, in 1996, we constructed the system and accumulated data. Kodera presented as "Radiographic differential diagnosis in dental region using expert system" in the 37th Japanese Society for Oral and Maxillofacial Radiology Annual meeting in September 1996. Finally, we evaluated clinically the developed system in Hiroshima University, namely dentists evaluated and confirmed the effectiveness of these methods. The method proposed in this study was applied to the other area in dental images.