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Table 2 Comparison between bladder volumes estimated using bladder scan and using anatomic references on planning computed tomography

From: Simple calculation using anatomical features on pre-treatment verification CT for bladder volume estimation during radiation therapy for rectal cancer

Estimation tool Number of data sets Mean percent difference 95% CI SD of percent difference P
Vscan 462 42.7 39.4–45.9 35.5 < 0.001
Vratio 462 26.3 24.6–28.1 19.6  
  1. Abbreviations: CI confidence interval, SD standard deviation, Vscan bladder volume measurement using bladder scan, Vratio bladder volume measurement using ratio of anatomical features