Based on the structural feature of the linear time grating displacement sensor,the main source for the error of dynamic measurement is proposed.Using grating ruler as a mother,when the linear grating displacement sens...Based on the structural feature of the linear time grating displacement sensor,the main source for the error of dynamic measurement is proposed.Using grating ruler as a mother,when the linear grating displacement sensor spatial location is the measured value of the grating,grating measurement and linear time grating displace-ment sensor predicted value is compared.Dynamic measurement error is obtained.The error value is to data trun-cation error and sampling,abnormal data,then the error value of amplitude spectrum and phase spectrum analy-sis,so as to the correction of error separation and harmonic correction development of high-precision linear time grating displacement sensor.展开更多
文摘目的探讨实时弹性成像能否诊断相同时间点、不同程度肝脏创伤,并通过图像对不同程度创伤进行评分。方法建立"—"型创伤病灶组和"#"型创伤病灶组新西兰兔各40只,每只肝脏创伤病灶1处,在不同的时间点10 min(n=40),30 min (n=35),60 min (n=30)分别测量实时弹性成像数值平均值、弹性应变比值SR平均值,最后根据3组实时弹性成像图像进行评分。结果通过对比分析得出在不同程度创伤条件下,在10 min和30 min时,两组实时弹性成像平均值无统计学差异。只有在第60 min时两者存在统计学差异。在弹性应变比值SR平均值方面,3个时间点两组均没有统计学差异。实时弹性成像评分两组都是随着时间的增加,由1、2分向4、5分转变。结论通过本研究发现,一定条件下实时弹性成像在中短是时间内无法鉴别不同程度创伤,只有在较长时间(60 min)才可以做出鉴别诊断。但实时弹性成像对于肝脏创伤的评分均可以发现两组随着时间的延长而发生的变化。
基金supported by National Natural Science Foundation of China(No.51205434,51405049,51435002)
文摘Based on the structural feature of the linear time grating displacement sensor,the main source for the error of dynamic measurement is proposed.Using grating ruler as a mother,when the linear grating displacement sensor spatial location is the measured value of the grating,grating measurement and linear time grating displace-ment sensor predicted value is compared.Dynamic measurement error is obtained.The error value is to data trun-cation error and sampling,abnormal data,then the error value of amplitude spectrum and phase spectrum analy-sis,so as to the correction of error separation and harmonic correction development of high-precision linear time grating displacement sensor.
