Schlesinger A E, Hernandez R J, Zerin J M, Marks T I, Kelsch R C
Department of Radiology, University of Michigan Hospitals, Ann Arbor 48109.
AJR Am J Roentgenol. 1991 May;156(5):1029-32. doi: 10.2214/ajr.156.5.2017927.
Sonographic measurement of renal length is used commonly to evaluate growth of the kidneys in children. However, no previous studies have been performed to determine the degree of interobserver and intraobserver variability in such determinations. We measured the interobserver and intraobserver error in sonographic measurements of renal length obtained independently by three experienced imagers in 21 children (41 kidneys). The mean interobserver variation between any two imagers ranged from 3.87 to 5.49 mm. The mean intraobserver variation was 0.87 to 3.61 mm. The observed variability in sonographic measurement of renal length is comparable to the expected annual increase in length of the kidneys during childhood (2.2-5.7 mm per year). Therefore, caution is suggested when using sonography to evaluate renal growth in children during a year's time.
超声测量肾脏长度常用于评估儿童肾脏的生长情况。然而，此前尚未有研究确定在这类测量中观察者间和观察者内的变异程度。我们测量了三位经验丰富的影像科医生独立获得的21名儿童（41个肾脏）肾脏长度超声测量的观察者间和观察者内误差。任意两位影像科医生之间的平均观察者间变异范围为3.87至5.49毫米。观察者内平均变异为0.87至3.61毫米。肾脏长度超声测量中观察到的变异与儿童期肾脏长度预期的年增长幅度（每年2.2 - 5.7毫米）相当。因此，建议在一年内使用超声评估儿童肾脏生长时要谨慎。
