RONC-02. COMPARISON OF 3D PRINTED HEADREST FOR PEDIATRIC PATIENTS AND BRAINLAB® SRS STANDARD HEADREST IN RADIOTHERAPY

Abstract

OBJECTIVE: The SRS standard headrest provided by BRAINLABR frameless SRS systemR was too big for pediatric patients. We applied 3D printing technology to produce a novel headrest for pediatric patients in radiotherapy. Our study aimed to compare the setup errors and transmittance between 3D printed headrest for pediatric patients and BRAINLABR SRS standard headrest in radiotherapy. METHODS: Thirty pediatric patients aged from 3 to 7 years old with cranial tumors were randomly selected from August 2016 to November 2017. These patients were divided into two groups equally. First group of patients was immobilized by 3D printed headrest with masks. Second group of patients were immobilized by BRAINLABR SRS standard headrest with masks. The transmittance in both groups were recorded by DOSE1R with cc13 detector. The setup errors in VRT, LAT and AP directions were recorded by Exactrac® with Robotic® before radiotherapy. RESULTS: The average of transmittance was 98.891455% in group 1 and 98.51455% in group 2. The setup errors in VRT, LAT and AP directions were (0.040 ± 0.055) mm, (0.040 ± 0.055) mm and (0.10 ± 0.07) mm in group 1, as compared with (0.160 ± 0.055) mm, (0.08 ± 0.11) mm and (0.10 ± 0.10) mm in group 2. 3D printed headrest reduced setup errors in VRT direction (P<0.05) with no significant difference in the other two directions (P>0.05). CONCLUSION: Compared with BRAINLAB® SRS standard headrest, 3D printed headrest for pediatric patients showed higher transmittance and reduces the setup errors in VRT direction.