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目的探讨64层螺旋CT在儿童上颌埋伏牙诊断中的低剂量扫描技术。方法收集我院75例上颌埋伏牙患儿,随机分为A,B,C 3组,分别采用90,60,40的有效毫秒数值(mAs)进行扫描,由2名副主任医师采用双盲法分析图像质量并打分,同时记录不同有效mAs时的剂量长度乘积(DLP),并进行统计学处理。结果 3组图像均能清晰区分牙齿结构,重建图像质量无明显差异;B组和C组的图像牙齿锐利度、牙槽突骨小梁的分辨力较A组依次下降,但仍能满足诊断要求;C组与A组比较,DLP值显著下降(P<0.05)。结论有效mAs为40的低剂量扫描技术可以满足儿童上颌埋伏牙的诊断需要,并能显著降低患儿接受的辐射剂量。
Objective To investigate the low-dose scanning technique of 64-slice spiral CT in diagnosis of children’s maxillary impacted teeth. Methods 75 cases of maxillary ambush teeth in our hospital were collected and randomly divided into A, B and C groups. The effective millisecond values (mAs) of 90, 60 and 40 were used for scanning. The two deputy chief physicians used the double-blind method The image quality was analyzed and scored, and the dose length product (DLP) at different effective mAs was recorded and statistically processed. Results The three groups of images could clearly distinguish the tooth structure, and there was no significant difference in the reconstructed image quality. The sharpness of teeth and the resolution of alveolar trabeculae in group B and group C were lower than those in group A, but still satisfied the diagnosis The DLP value of group C was significantly lower than that of group A (P <0.05). Conclusion The low dose scanning technique with effective mAs of 40 can meet the diagnostic needs of the maxillary impacted teeth in children and can significantly reduce the dose of radiation accepted by children.