目的比较分析高压蒸汽灭菌次数对口内扫描仪扫描精度的影响,为临床消毒规范化操作提供依据。方法选择10个未经使用的口内扫描仪(Trios,3Shape,丹麦)扫描头,经1、20、40、60次高压蒸汽灭菌后扫描同一标准牙列石膏模型,获得灭菌1、20、40...目的比较分析高压蒸汽灭菌次数对口内扫描仪扫描精度的影响,为临床消毒规范化操作提供依据。方法选择10个未经使用的口内扫描仪(Trios,3Shape,丹麦)扫描头,经1、20、40、60次高压蒸汽灭菌后扫描同一标准牙列石膏模型,获得灭菌1、20、40、60次组数据,每个扫描头每次灭菌循环后重复扫描模型5次。使用模型扫描仪(D2000,3Shape,丹麦)扫描标准牙列石膏模型,将扫描数据作为对照组。用游标卡尺及测量软件分别测量石膏模型和4个灭菌组模型跨弓长度(上颌双侧第一磨牙近中颊尖的距离)和牙弓前后长度(上颌右侧中切牙舌隆突至上颌右侧第一磨牙颊尖的距离)。用单因素方差分析比较4个灭菌组数据测量结果分别与石膏模型测量结果的差异;将所有扫描数据导入Geomagic Studio 2013软件中,比较灭菌组和对照组结果的三维偏差,将拟合对齐后得到的均方根估计值作为正确度,将每个灭菌组中每个扫描头重复测量结果的标准差作为精密度,用方差分析比较4个灭菌组正确度值和精密度值差异。结果4个灭菌组跨弓长度随着灭菌次数的增加而增加,与石膏模型的差异均有统计学意义(P<0.05);牙弓前后长度与石膏模型的差异均无统计学意义(P>0.05)。两两比较显示,4个灭菌组正确度差异均有统计学意义(P<0.05),正确度由高至低依次为灭菌1次组[(114.85±3.75)μm]、灭菌20次组[(124.65±3.85)μm]、灭菌40次组[(131.45±3.04)μm]和灭菌60次组[(144.64±3.34)μm];4个灭菌组精密度差异均无统计学意义(P>0.05)。结论高压蒸汽灭菌次数可影响口内扫描仪扫描结果的正确度,且随着灭菌次数的增加,扫描的误差也呈增大趋势,灭菌次数对扫描的可重复性无影响。经高压蒸汽灭菌60次后口内扫描数据精度仍可满足临床需要。展开更多
This paper presents a flexible and high speed digital scan converter (DSC) with the ability to handle high frequency ultrasound imaging in real-time. The characteristics in imaging system such as focus length of trans...This paper presents a flexible and high speed digital scan converter (DSC) with the ability to handle high frequency ultrasound imaging in real-time. The characteristics in imaging system such as focus length of transducer, the swing radius and sampling length etc. could be changed easily in compliance with the researcher's application based on this flexible digital scan converter. Linear interpolation is employed to achieve the coordinate transformations algorithm. Custom-built software is programmed to preliminarily handle the algorithm according to different ultrasound imaging applications. High performance FPGA will implement high speed interpolation calculation based on the preliminary data which are stored in the DDR2 SDRAM from the software. 64 bit 66 MHz PCI is employed to accomplish high speed data transmission. Experiment has shown that more than 500 frame rate could be achieved based on this high speed digital scan converter. The designed flexible and high speed digital scan converter could be used in current FPGA based high frequency ultrasound imaging system.展开更多
文摘目的比较分析高压蒸汽灭菌次数对口内扫描仪扫描精度的影响,为临床消毒规范化操作提供依据。方法选择10个未经使用的口内扫描仪(Trios,3Shape,丹麦)扫描头,经1、20、40、60次高压蒸汽灭菌后扫描同一标准牙列石膏模型,获得灭菌1、20、40、60次组数据,每个扫描头每次灭菌循环后重复扫描模型5次。使用模型扫描仪(D2000,3Shape,丹麦)扫描标准牙列石膏模型,将扫描数据作为对照组。用游标卡尺及测量软件分别测量石膏模型和4个灭菌组模型跨弓长度(上颌双侧第一磨牙近中颊尖的距离)和牙弓前后长度(上颌右侧中切牙舌隆突至上颌右侧第一磨牙颊尖的距离)。用单因素方差分析比较4个灭菌组数据测量结果分别与石膏模型测量结果的差异;将所有扫描数据导入Geomagic Studio 2013软件中,比较灭菌组和对照组结果的三维偏差,将拟合对齐后得到的均方根估计值作为正确度,将每个灭菌组中每个扫描头重复测量结果的标准差作为精密度,用方差分析比较4个灭菌组正确度值和精密度值差异。结果4个灭菌组跨弓长度随着灭菌次数的增加而增加,与石膏模型的差异均有统计学意义(P<0.05);牙弓前后长度与石膏模型的差异均无统计学意义(P>0.05)。两两比较显示,4个灭菌组正确度差异均有统计学意义(P<0.05),正确度由高至低依次为灭菌1次组[(114.85±3.75)μm]、灭菌20次组[(124.65±3.85)μm]、灭菌40次组[(131.45±3.04)μm]和灭菌60次组[(144.64±3.34)μm];4个灭菌组精密度差异均无统计学意义(P>0.05)。结论高压蒸汽灭菌次数可影响口内扫描仪扫描结果的正确度,且随着灭菌次数的增加,扫描的误差也呈增大趋势,灭菌次数对扫描的可重复性无影响。经高压蒸汽灭菌60次后口内扫描数据精度仍可满足临床需要。
文摘This paper presents a flexible and high speed digital scan converter (DSC) with the ability to handle high frequency ultrasound imaging in real-time. The characteristics in imaging system such as focus length of transducer, the swing radius and sampling length etc. could be changed easily in compliance with the researcher's application based on this flexible digital scan converter. Linear interpolation is employed to achieve the coordinate transformations algorithm. Custom-built software is programmed to preliminarily handle the algorithm according to different ultrasound imaging applications. High performance FPGA will implement high speed interpolation calculation based on the preliminary data which are stored in the DDR2 SDRAM from the software. 64 bit 66 MHz PCI is employed to accomplish high speed data transmission. Experiment has shown that more than 500 frame rate could be achieved based on this high speed digital scan converter. The designed flexible and high speed digital scan converter could be used in current FPGA based high frequency ultrasound imaging system.
