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Table 1 Displacement of pelvic organ center of mass compared to simulation CT (in mm)

From: Strict bladder filling and rectal emptying during prostate SBRT: Does it make a dosimetric or clinical difference?

  All fractions Fraction 5
Mean ± SD  > 3mm (%)a Mean ± SD  > 3mm (%)a
CTVb
 Lateral − 0.11 ± 0.82 1 − 0.07 ± 0.87 1
 Anterior/posterior 0.64 ± 1.75 10 0.66 ± 1.73 12
 Superior/inferior 0.07 ± 1.37 3 0.37 ± 1.44 6
Bladder
 Lateral − 0.03 ± 2.84 26 0.02 ± 2.91 27
 Anterior/posterior − 0.70 ± 6.45 60 − 0.86 ± 6.24 62
 Superior/inferior − 2.82 ± 8.98 75 − 3.40 ± 8.84 82
Bladder Trigone
 Lateral − 0.19 ± 1.64 8 − 0.14 ± 1.90 12
 Anterior/posterior 2.64 ± 6.25 53 4.02 ± 6.59 52
 Superior/inferior − 0.50 ± 3.43 8 − 0.55 ± 3.29 6
Rectum
 Lateral − 0.13 ± 1.86 9 − 0.12 ± 1.87 8
 Anterior/posterior − 0.21 ± 3.28 26 0.05 ± 3.14 24
 Superior/inferior 3.19 ± 5.84 62 2.38 ± 5.74 65
  1. Positive values denote superior, anterior, or leftward displacement of organ center of mass
  2. a> 3 mm refers to percentage of > 3 mm displacements relative to center of mass at simulation CT
  3. bCTV denotes prostate and seminal vesicles