DOSIMETRIC COMPARISON OF SCALP AND ORGANS AT RISK WITH DIFFERENT RADIOTHERAPY TECHNIQUES IN MALIGN GLIAL TUMORS

In malign glial tumors treated with radiotherapy (RT); despite the current treatment plan with volumetric arc (t-VMAT) technique, 1 arc VMAT and static 5 field intensity modulated RT technique wre compered dosimetrically. Sixteen malign glial tumors treated with at least 50 Gy RT were included. Sixteen, 30 and 24 Gray thresholds doses were used for mean, 1 and 9 cc scalp volumes. There was no statistically significant difference between methods in terms of planning treatment volume and risky organ doses. Significant reductions in scalp doses were observed (p < 0.05) with the inclusion of scalp regardless of the planning methods. Despite the hair loss in acute period, there was no permanent hair loss in any case in 12-month follow-up. It has been shown by this study, the inclusion of scalp into the treatment plan does not have a negative effect on the target volume doses, and our patients may be protected from cosmetic and psychosocial side effects caused by permanent hair loss