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Table 2 Variations in bladder volume for all patients. The group x means number of treatments (x − 1) * 5 + 1 ~ (x − 1) * 5 + 5

From: Online MR evaluation of inter- and intra-fraction uterus motions and bladder volume changes during cervical cancer external beam radiotherapy

  All patients Group1 (1–5) Group2 (6–10) Group3 (11–15) Group4 (16–20) Group5 (21–25) Group6 (26–30)
  Mean σ Mean σ Mean σ Mean σ Mean σ Mean σ Mean σ
Treat time (ml) 26.84 6.94 27.65 8.20 27.18 7.29 27.00 6.87 26.34 5.59 23.96 4.76 28.69 5.72
Vpre − Vplan (ml)  − 96.88 143.46  − 97.98 169.11  − 92.52 139.66  − 75.33 141.14  − 99.89 99.52 − 112.27 155.17 − 140.72 112.66
Vpost – Vplan (ml)  − 10.52 152.88  − 2.64 176.17 8.02 154.22 13.94 146.09 − 24.87 113.13 − 46.57 154.85 − 81.56 125.96
Vus – Vpre (ml) 77.25 86.76 61.29 106.78 75.77 81.26 84.24 81.87 75.37 59.81 98.62 87.79 98.15 69.24
Vplan – Vus (ml) 19.63 148.89 36.69 160.11 16.74 145.36 − 8.91 158.96 24.52 98.93 13.65 178.22 42.56 126.19
Vpre – Vus (ml) 9.11 116.47 34.05 140.01 24.76 105.70 5.02 123.70 − 0.34 88.27 − 32.92 93.74 − 39.00 77.48
Vpost – Vpre (ml) 86.37 70.63 95.34 83.17 100.54 65.21 89.27 81.27 75.02 58.02 65.70 39.35 59.15 50.60
(Vpost − Vpre)/dt 3.43 3.05 3.68 3.33 4.26 4.03 2.34 1.76 2.93 2.16 2.90 1.92 2.33 2.30