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Dose-position and dose-volume histogram analysis of standard wedged and intensity modulated treatments in breast radiotherapy

E M Donovan, MSc 1 N J Bleackley, MSc 1 P M Evans, DPhil 1 S F Reise, MSc 1 and J R Yarnold, MD 2

1 Joint Department of Physics and 2 Department of Radiotherapy, Royal Marsden NHS Trust and Institute of Cancer Research, Downs Road, Sutton, Surrey SM2 5PT, UK



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  		Figure 1. Example of a portal image generated transverse outline for a patient with right-sided disease.

 


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  		Figure 2. (a) Quasi-sagittal outline through the isocentre and normal to the baseline of the tangent pair. (b) Quasi-coronal outline through the isocentre and parallel to the baseline of the tangent pair, showing typical isodose distribution. Dotted lines indicate the division of the outlines into three regions to facilitate positioning of dose data. The isodose plots are at the same magnification.

 


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  		Figure 3. Pie charts summarizing the dose-position relationship for 150 patients treated with standard wedged plans and 150 patients with intensity modulated radiotherapy (IMRT) plans.

 


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  		Figure 4. An example dose volume histogram plot for a standard and an intensity modulated radiotherapy (IMRT) plan. {blacksquare} {blacksquare} {blacksquare}, standard plan; —, IMRT plan.

 


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  		Figure 5. Bar chart showing the effect of intensity modulated radiotherapy on the maximum and mean doses in the treatment volume. The data are the mean over all 300 plans.

 


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  		Figure 6. The upper line of the diagram shows three hypothetical dose distributions with the corresponding dose-volume histogram beneath.

 


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  		Figure 7. An example of 10 individual dose-volume histogram (DVH) plots and their mean DVH plot. ---, individual DVH; —, mean DVH.

 




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