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different title angle
相关语句
  不同倾斜角度
     (2) Pantomography in different title angle by ruler-steel ball experiment was performed,and the influence of image clearness due to incisor title angle was evaluated;
     (2)用直尺钢珠实验模拟切牙进行不同倾斜角度曲面断层摄影,检测切牙倾角对曲面断层摄影图像清晰度的影响;
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  相似匹配句对
     The different O.
     不同的O.
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     title;
     语言精炼,标题简洁;
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     angle.
     角。
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     <title>sic enjoyment in different moods
     不同心境下的音乐欣赏
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     The characteristic at different angle of attack is analysed.
     分析了二维超音速进气道的攻角特性;
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Objective To investigate the experimental method and application on quality control of pantomography.Methods(1) To compare the difference of imaging effect of straight x-ray region and oblique x-ray region was compared by experiment comparative method using a ruler inlaid with several steel balls,and the causes of blurring on the top region of teeth were analysed;(2) Pantomography in different title angle by ruler-steel ball experiment was performed,and the influence of image clearness due to incisor title...

Objective To investigate the experimental method and application on quality control of pantomography.Methods(1) To compare the difference of imaging effect of straight x-ray region and oblique x-ray region was compared by experiment comparative method using a ruler inlaid with several steel balls,and the causes of blurring on the top region of teeth were analysed;(2) Pantomography in different title angle by ruler-steel ball experiment was performed,and the influence of image clearness due to incisor title angle was evaluated;(3) To calculate and draw the stucture mapes of pantomography images by many point meamurement with copper net test were drawed.Results(1) The oblique x-ray beem did not result in blurring image;(2) The clearness of steel balls in the ruler was related to the title angle of ruler.A great title angle resulted in blurring of steel balls,that suggested blurring of the incisor root was related to the title angle of incisor;(3) Slice thickness was different in different regions of pantomography,and it was 7mm in the incisor region.The main cause of blurring incisor root on pantomography was that the tomographic slice did not include full-length incisor.Conclusion The quality of pantomography can be improved by different method.

目的研究口腔曲面断层摄影质量控制的实验方法及应用。方法(1)用直尺钢珠对比实验对比直射线区与斜射线区成像效果的差异,分析牙齿以上区域模糊的形成原因;(2)用直尺钢珠实验模拟切牙进行不同倾斜角度曲面断层摄影,检测切牙倾角对曲面断层摄影图像清晰度的影响;(3)用铜丝网试验多点测量计算绘制出曲面断层摄影之图像层面结构图。结果(1)斜射线并不会导致影像变形模糊,牙齿以上区域图像模糊并非斜射线之故;(2)直尺上钢珠的清晰度与直尺的倾斜角度有关,倾角过大即可产生模糊,提示切牙根部模糊与切牙倾斜程度有关;(3)曲面断层摄影各区域图像层面厚度不同,切牙区厚度最薄,仅0.7 cm,使多数人切牙全长不能同时落在图像层面内而产生模糊。结论通过不同方法可以改善口腔曲面断层摄影的质量。

 
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