Figure 6

Comparison of tumour growth after irradiation with laser electrons and 200 kV X-rays. Time dependent relative tumour volume increase for the untreated control, sham irradiation with "0 Gy" and after treatment with a dose of 14 Gy by JETI laser accelerated electrons (triangles) and by 200 kV X-rays (squares), respectively. The numbers in brackets specify the animals allocated to the different groups, the error bars display the corresponding SEM to the mean value of the corresponding group. The apparently different tumour growth rates, compared to the results displayed in Figure 5, resulted from the different tumour diameters of 1.0 – 1.5 mm and 2.0 – 2.5 mm defined as starting size at which the animals were included in the experiments in Dresden and Jena, respectively.