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Table 3 Comparison between bladder volumes estimated using bladder scan and using anatomical features on cone-beam 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 108 33.2 28.5–37.8 26.7 < 0.001
Vratio 108 23.4 21.3–29.5 21.4  
  1. Abbreviations: CI confidence interval, SD standard deviation, Vscan bladder volume measurement using bladder scan, Vratio bladder volume measurement using ratio of anatomical features