彩色多普勒闪烁伪像相关物理因素的评估分析

发布时间：2018-04-11 23:11

本文选题：闪烁伪像 + 模型　；参考：《山东大学学报(医学版)》2017年07期

【摘要】：目的评估超声波声学特性、结石表面形貌及机器设置条件在闪烁伪像形成中的价值。方法应用砂纸及泌尿系结石分别构建体外实验模型,砂纸模型中通过调节IU22声学功率参数(包括机械指数及声波入射角度)改变超声波特性,结石模型分别按照表面粗糙度差异进行结石分组(包括粗糙组,中度粗糙组与光滑组),然后选取两种不同机器设置条件(默认设置与优化设置)进行闪烁伪像成像,应用配对t检验分析比较砂纸模型中垂直辐射组与斜方辐射组闪烁伪像差异;应用重复测量设计的方差分析比较结石模型中不同机器设置条件下不同表面粗糙度结石组间闪烁伪像强度差异;通过线性回归分析分别对砂纸模型中机械指数、结石模型中不同结石粗糙度与闪烁伪像强度之间进行相关性分析。结果在砂纸模型中,机械指数与闪烁伪像强度存在显著正相关(r=0.938,P0.001),斜方辐射组闪烁伪像强度较垂直辐射组明显减弱(P0.05);泌尿系结石模型中,不同表面粗糙度泌尿系结石的闪烁伪像强度组间差异有统计学意义且其两个影响因素(表面粗糙度与机器设置条件)存在交互作用(P0.001),相同表面粗糙度的泌尿系结石中的闪烁伪像强度在机器优化设置条件下均明显强于默认设置条件(P0.001),而在相同机器设置条件下不同组间结石闪烁伪像强度与其表面粗糙程度呈明显正相关(r默认设置条件=0.80,r优化设置条件=0.83,P0.001)。结论砂纸模型及泌尿系结石模型均显示闪烁伪像形成受超声波声学特性、结石表面粗糙度及机器设置条件的共同影响,了解各种相关因素的作用可提升其临床应用价值。
[Abstract]:Objective to evaluate the value of ultrasonic acoustic characteristics, stone surface morphology and machine setting conditions in the formation of scintillation artifacts.Methods the in vitro experimental model of sandpaper and urolithiasis were established respectively. The ultrasonic characteristics were changed by adjusting the acoustic power parameters of IU22 (including mechanical index and incidence angle of acoustic wave) in the sand paper model.Stone models were divided into three groups according to the difference of surface roughness (including rough group, medium rough group and smooth group), and then two different machine settings (default setting and optimized setting) were selected for scintillation artifact imaging.The difference of scintillation artifacts between vertical radiation group and oblique square radiation group in sandpaper model was analyzed by paired t-test.The variance analysis of repeated measurement design was used to compare the difference of false intensity of scintillation among stone groups with different surface roughness under different machine setting conditions in stone model, and the mechanical index of sand paper model was analyzed by linear regression analysis.The correlation between different stone roughness and scintillation artifact intensity was analyzed in the stone model.Results in the sand paper model, there was a significant positive correlation between the mechanical index and the intensity of scintillation artifacts, and the intensity of scintillation artifacts in the oblique radiation group was significantly lower than that in the vertical radiation group, while in the urolithiasis model, the intensity of the scintillation pseudo image was significantly decreased in the oblique radiation group than in the vertical radiation group.There was significant difference in the intensity of scintillation artifacts between different surface roughness urolithiasis groups, and there was interaction between two factors (surface roughness and machine setting condition), and the urinary tract junction with the same surface roughness.The intensity of scintillation artifact in stone is obviously stronger than that in default setting condition (P0.001) under the condition of machine optimization, but the false intensity of stone scintillation in different groups is positively correlated with the surface roughness under the same machine setting condition.The optimum setting condition is 0.83 P0.001.Conclusion both sandpaper model and urolithiasis model show that the formation of scintillation artifacts is affected by ultrasonic acoustic characteristics, stone surface roughness and machine setting conditions. Understanding the role of various related factors can enhance its clinical application value.
【作者单位】：苏州大学附属第二医院超声中心;山东大学齐鲁医院超声科;
【基金】：山东省科技发展计划(2012GSF11847) 山东大学齐鲁医院科研基金资助项目;山东大学基本科研业务费专项资金(2015QLMS39)
【分类号】：R445.1

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