根尖片数字减影对牙槽骨微小病损检测能力的评价

目的评价根尖片数字减影处理系统对微小病损检出的准确率。方法于干燥下颌骨牙槽嵴区制作０．２ｍｍ３～１．９ｍｍ３微小病损共７２个，在制作病损前后摄定位根尖片，分别用数字减影方法与直接读片法对这些随机分布的微小病损进行检测。结果对于０．２ｍｍ３～０．５ｍｍ３的微小病损两种方法的检出率均低于５０．０％。对于０．７ｍｍ３病损直接读片法检出率为３８．７％，而ＤＳＲ法为５７．５％（Ｐ＜０．０１），对于０．９ｍｍ３病损，ＤＳＲ法和直接读片法的检测准确率分别为８９．３％和５７．３％（Ｐ＜０．０１）。结论ＤＳＲ系统对微小骨病损的检测能力明显优于直接读片法。

Detection of small alveolar bone lesions by digital subtraction radiography

OBJECTIVE: To employ digital subtraction radiography (DSR) system developed by our school and co-ordinative unit, for diagnosis of small artificial alveolar bone lesions, in order to evaluate the system. METHODS: Seventy-two 0.2-0.9 mm3 lesions were produced in premolar and molar areas of the dry human mandibles. The reference and subsequent radiographs were taken before and after lesions being made. The small lesions were detected by conventional radiographs and by DSR method respectively. RESULTS: As for 0.2-0.5 mm3 lesions, the detections by both DSR and conventional methods were less than 50%. As for 0.7 mm3 lesions, the detection by DSR and conventional methods were 57.5% and 38.7%, respectively (P < 0.01). As for 0.9 mm3 lesions, the accuracy of the detection by DSR and conventional methods was 89.3% and 57.3% (P < 0.01). CONCLUSION: The detectability of small alveolar bone lesions by DSR system was obviously superior to the conventional method.