Emamian S A, Nielsen M B, Pedersen J F
Department of Radiology and Ultrasound, Glostrup Hospital, University of Copenhagen, Denmark.
Acta Radiol. 1995 Jul;36(4):399-401.
Estimation of renal size by sonography can be performed by measuring renal length, volume, cortical volume or cortical thickness. Observer variation in these measurements is an important factor, especially when repeated measurements are compared. This study was performed to examine the magnitude of intraobserver and interobserver variations for each of the above-mentioned measurements, and to find the measurement with the lowest observer variation. Sonographic measurements were performed by 3 observers on 18 adult volunteers. The standard deviation of the difference (SDD) between any 2 pairs of measurements was used as the indicator of the magnitude of the observer variation. Renal length measurement showed the lowest observer variation with a relative SDD of 4 to 5%. Measurement of cortical thickness showed the poorest reproducibility with a relative SDD of 18 to 23%, while volumetric estimations had a relative SDD of 14 to 17%. Renal length measurement should be preferred to renal volume estimation, especially when comparing repeated measurements.
通过超声检查估计肾脏大小可通过测量肾脏长度、体积、皮质体积或皮质厚度来进行。这些测量中的观察者差异是一个重要因素，尤其是在比较重复测量时。本研究旨在检查上述每项测量的观察者内和观察者间差异的程度，并找出观察者差异最小的测量方法。3名观察者对18名成年志愿者进行了超声测量。任意两对测量值之间差异的标准差（SDD）用作观察者差异程度的指标。肾脏长度测量的观察者差异最小，相对SDD为4%至5%。皮质厚度测量的可重复性最差，相对SDD为18%至23%，而体积估计的相对SDD为14%至17%。与肾脏体积估计相比，应优先选择肾脏长度测量，尤其是在比较重复测量时。
