Factors affecting the measurement of renal length

R. J. Hernandez, K. Poznanski, L. R. Kuhns, T. L. McCormick

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


The variation in kidney length between the 1-min radiograph (centered over the kidney) and the 5-min study (centered over the mid-abdomen) was evaluated on 100 random excretory urograms. When both kidneys were measurable, the change in kidney size was discordant in 40%. Most such changes are due to changes in geometry, differences in centering, or changes in the angle of the kidney with respiration. These alterations are of much greater magnitude than the reported swelling of the kidney due to contrast medium. Since there is practically no relation between the time of injection and changes in renal image size, it makes no difference whether the 1-min or 5-min radiograph is selected for measurement.

Original languageEnglish (US)
Pages (from-to)653-656
Number of pages4
Issue number3
StatePublished - 1979

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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