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Renal Volume Measurements: Accuracy and Repeatability of US Compared with That of MR Imaging1

Jeannette Bakker, MD, Marco Olree, MD, Robert Kaatee, MD, Eduard E. de Lange, MD, Karel G. M. Moons, PhD, Jaap J. Beutler, MD and Frederik J. A. Beek, MD

1 From the Departments of Radiology (J.B., M.O., R.K., F.J.A.B.) and Nephrology (J.J.B.), University Hospital Utrecht, Heidelberglaan 100, 3584 CX Utrecht, the Netherlands; the Department of Radiology, University of Virginia Health Sciences Center, Charlottesville (E.E.d.L.); and the Julius Centre for Patient Oriented Research, University Utrecht, the Netherlands (K.G.M.M.). Received March 31, 1998; revision requested June 16; revision received August 27; accepted January 20, 1999. Address reprint requests to J.B.



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  		Figure 1. Renal volumes calculated with the ellipsoid formula at US (white bars) compared with those calculated with the standard of reference (ie, voxel-count method applied to MR images) (black bars). Renal volumes calculated with the ellipsoid formula at US were, on average, underestimated by 44.7 mL (25%) compared with those calculated with the standard of reference.

 


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  		Figure 2. Length and volume of each kidney. Renal lengths were measured on coronal MR images (mean of the two measurements obtained by the two observers). Renal volumes were obtained by applying the voxel-count method to MR images (mean of the two measurements obtained by the two observers). The plot shows that kidneys of a certain length can have a wide range of volumes.

 




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