彩色多普勒超声仪血液流速测量值误差不确定度的评定研究

The Evaluation of Uncertainty in Blood Flow Velocity Measurement Error of Color Doppler Ultrasound Instrument

目的综合评定彩色多普勒超声仪血液流速测量误差的不确定度。方法选取医院在用的10台彩色多普勒超声仪依据标准JJF1438-2013、JJF(皖)130-2022、JJF(冀)3028-2023中血液流速校准的方法和要求,识别彩色多普勒超声仪血液流速测量误差的不确定度来源,并从标准不确定度、合成标准不确定度和扩展不确定度的评定等方面对血液流速测量值误差不确定度进行综合考量。结果重复性测量引入的不确定度为0.45 cm/s,标准器引入的不确定度分别为0.58 cm/s(仿血流模体本身)和0.03 cm/s(温度23℃),多普勒角度选择引入的不确定度为0.35 cm/s,流量计不准引入的不确定度为0.72 cm/s,流量修正系数引入的标准不确定度为0.29 cm/s,脉冲多普勒(PW)探头测量流速分辨力的不确定度为0.045 cm/s,合成标准不确定度为1.1 cm/s,扩展不确定度为2.2 cm/s。结论选取的10台彩色多普勒超声仪血液流速的不确定度评定结果真实可靠,能够为临床患者定量评估浅表血管的供血状态提供精准测量数据,保证患者各项指标的精确度。

Objective To comprehensively evaluate the uncertainty of blood flow velocity measurement error of color Doppler ultrasound instrument.Methods With the selection of 10 color Doppler ultrasound instruments,the sources of uncertainty in blood flow velocity measurement errors of color Doppler ultrasound instruments were identified based on the methods and requirements for blood flow velocity calibration in JJF1438-2013,JJF(Anhui)130-2022,and JJF(Hebei)3028-2023 standards.In addition,the uncertainty of the measurement error of blood flow velocity using color Doppler ultrasound was comprehensively considered,including the evaluation of standard uncertainty,composite standard uncertainty,and extended uncertainty.Results The uncertainty introduced by repetitive measurement was 0.45 cm/s,the uncertainty introduced by the standard was 0.58 cm/s(simulating the blood flow phantom itself)and 0.03 cm/s(temperature 23℃),the uncertainty introduced by Doppler angle selection was 0.35 cm/s,the uncertainty introduced by flow meter inaccuracy was 0.72 cm/s,the standard uncertainty introduced by flow correction factor was 0.29 cm/s,the uncertainty of flow velocity resolution measured by pulsed wave doppler(PW)probe was 0.045 cm/s,the composite standard uncertainty was 1.1 cm/s,and the expanded uncertainty was 2.2 cm/s.Conclusion In this study,the uncertainty assessment results of blood flow velocity using 10 selected color Doppler ultrasound instruments were true and reliable,which can provide accurate measurement data for clinical patients to quantitatively evaluate the blood supply status of superficial vessels and ensure the accuracy of various indicators of patients.