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Estimating Splenic Volume: Sonographic Measurements Correlated with Helical CT Determination

¹ Department of Radiology, Loyola University Medical Center, Maywood, IL 60153.
² Present address: Department of Radiology, St. Luke's Hospital of Kansas City, 4401 Wornall Rd., Kansas City, MO 64111.
³ School of Interdisciplinary Computing and Engineering, University of Missouri–Kansas City, Kansas City, MO 64113.

View larger version (134K): [in a new window]   Fig. 1A. —41-year-old woman with abnormal results on liver function tests. CT scan depicts volume software calculation of splenic volume. Shaded area shows area of spleen estimated by computer on given slice. Volume at given level is calculated by CT software using sequential areas and slice thicknesses. Splenic volume for each level is displayed at top of image (arrow).

View larger version (134K): [in a new window]   Fig. 1B. —41-year-old woman with abnormal results on liver function tests. Transverse sonograms illustrate method of determining width (B) and thickness (C) of spleen. Width is measured as greatest overall dimension (arrows, B). Obtained at same level as B, C shows thickness, defined as shortest distance between hilum and outer convex surface of spleen (arrows, C), being measured as perpendicular to width as possible.

View larger version (127K): [in a new window]   Fig. 1C. —41-year-old woman with abnormal results on liver function tests. Transverse sonograms illustrate method of determining width (B) and thickness (C) of spleen. Width is measured as greatest overall dimension (arrows, B). Obtained at same level as B, C shows thickness, defined as shortest distance between hilum and outer convex surface of spleen (arrows, C), being measured as perpendicular to width as possible.

View larger version (112K): [in a new window]   Fig. 1D. —41-year-old woman with abnormal results on liver function tests. Longitudinal sonograms illustrate method of determining maximum (D) and craniocaudal (E) lengths. Maximum length is measured as greatest overall dimension (arrows, D). Obtained at same level as D, E shows craniocaudal length being measured from most superior margin to most inferior margin of spleen (arrows, E).

View larger version (119K): [in a new window]   Fig. 1E. —41-year-old woman with abnormal results on liver function tests. Longitudinal sonograms illustrate method of determining maximum (D) and craniocaudal (E) lengths. Maximum length is measured as greatest overall dimension (arrows, D). Obtained at same level as D, E shows craniocaudal length being measured from most superior margin to most inferior margin of spleen (arrows, E).

View larger version (13K): [in a new window]   Fig. 2. —Scatterplot shows that calculated sonographic volumes for large-volume spleens have wider scatter than spleens with average volume. W = width, T = thickness, AVL = average length, y = 0.8878x, R2 = 0.7457.

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