Figure 1
![Figure 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13014-014-0247-x/MediaObjects/13014_2014_Article_247_Fig1_HTML.jpg)
Dose distribution in color-wash for one representative patient with VMAT (top) and HT (bottom). Red line: PTV63. This figure shows a color-wash of the dose distribution from 25Gy to 63Gy in VMAT and HT for one patient: a better medullary canal sparing is obtained with HT compared to VMAT.