Figures & data
Figure 1. Schematic representation of the calculation of the DVH parameters during the treatment course. This example illustrates the calculation of bladder V95 for fraction 9 (of 23 fractions) as a weighted sum of the bladder V95 of the pretreatment (V951) CT scan and the after 40 Gy CT scan (V952) that had the nearest bladder volume to the bladder volume measured by US at fraction 9.
![Figure 1. Schematic representation of the calculation of the DVH parameters during the treatment course. This example illustrates the calculation of bladder V95 for fraction 9 (of 23 fractions) as a weighted sum of the bladder V95 of the pretreatment (V951) CT scan and the after 40 Gy CT scan (V952) that had the nearest bladder volume to the bladder volume measured by US at fraction 9.](/cms/asset/82569a2e-4459-423e-906c-e82e0bf52d45/ionc_a_813640_f0001_b.gif)
Figure 2. a) Distribution of the margin-of-the-day. b) Maximum margin-of-the-day per patient. c) Maximum of the margin-of-the-day for each treatment half.
![Figure 2. a) Distribution of the margin-of-the-day. b) Maximum margin-of-the-day per patient. c) Maximum of the margin-of-the-day for each treatment half.](/cms/asset/76c45263-bbd1-4562-80a1-9ff111b15145/ionc_a_813640_f0002_b.gif)
Figure 3. DVH parameters of the margin-of-the-day strategy and the population-based strategy. a) Percentage of cervix-uterus that received 95% of the prescribed dose b) Absolute volume of small bowel that received 99% of the dose and percentage of c) bladder and d) rectum that received 90% of the dose. The error bar denotes ± 1SD variation around the mean.
![Figure 3. DVH parameters of the margin-of-the-day strategy and the population-based strategy. a) Percentage of cervix-uterus that received 95% of the prescribed dose b) Absolute volume of small bowel that received 99% of the dose and percentage of c) bladder and d) rectum that received 90% of the dose. The error bar denotes ± 1SD variation around the mean.](/cms/asset/a98f152e-b36a-4a46-9a2d-567b0a1e6377/ionc_a_813640_f0003_b.gif)
Table I. Volume of the PTV using the population-based margin and the frequency-weighted volume of the PTV of the MoD strategy. An * in the last column points out the patients for whom the population-based margin did not provide sufficient coverage of the CTV.