Radiation Physics

PV QA 3 - Poster Viewing Q&A 3

TU_1_3121 - Comparision of 3D Printed Headrest for Pediatric Patients and SRS Standard Headrest in Radiation Therapy

Tuesday, October 23
1:00 PM - 2:30 PM
Location: Innovation Hub, Exhibit Hall 3

Comparision of 3D Printed Headrest for Pediatric Patients and SRS Standard Headrest in Radiation Therapy
L. Luo1, G. Deng1, P. Zhang1, P. Dai1, X. Wang2, D. Wang3, Q. Huang1, and L. CAI1; 1Guangdong 999 Brain Hospital, Guangzhou city ,Guangdong province, China, 2Dongguan Kanghua Hospital, Dongguan Guangdong province, China, 3Guangdong Puneng Biotechnologies Co.Ltd, Guangzhou Guangdong province, China

Purpose/Objective(s): The SRS standard headrest provided by frameless SRS system 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 SRS standard headrest in radiotherapy.

Materials/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 SRS standard headrest with masks. The transmittance in both groups were recorded by dosimeter with cc13 detector. The setup errors in VRT, LAT and AP directions were recorded by IGRT device with 6D couch 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 SRS standard headrest, 3D printed headrest for pediatric patients showed higher transmittance and reduces the setup errors in VRT direction.

Author Disclosure: L. Luo: None. G. Deng: None. P. Zhang: None.

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