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Normalized Residual Activity: Usual Values and Robustness of the Method

Department of Radioisotopes, Centre Hospitalo-Universitaire St. Pierre, Brussels, Belgium

View larger version (17K): [in a new window]   FIGURE 1. Bland–Altman plot shows effect of 20-s error on determination of NORA. Value of NORA is given on abscissa; difference (%) between NORA calculated using 1- to 2-min renal activity and using renal activity of 1 min 20 s to 2 min 20 s is shown on ordinate.

View larger version (25K): [in a new window]   FIGURE 2. Histograms of NORA values for normal kidneys (at 20 min) and for kidneys with pelviureteric junction stenosis that had undergone surgery (at 20 min, at end of furosemide [Lasix; Hoechst Marion Roussel SA, Brussels, Belgium] acquisition, and after micturition). Five categories of NORA values (0–1, 1–2, 2–3, 3–4, and 4–5) are given on abscissa; number (Nb) of kidneys for each category is given on ordinate.

View larger version (12K): [in a new window]   FIGURE 3. Comparison of NORA values obtained at end of furosemide acquisition and after micturition.

View larger version (13K): [in a new window]   FIGURE 4. Correlation between NORA and OE calculated at end of furosemide acquisition.