Progress in Medical Physics (한국의학물리학회지:의학물리)

Korean Society of Medical Physics (한국의학물리학회)
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Fabrication of a Patient-Customized Helmet with a Three-Dimensional Printer for Radiation Therapy of Scalp

  • Oh, Se An (Department of Radiation Oncology, Yeungnam University Medical Center) ;
  • Lee, Chang Min (Gyeongnam Science High School) ;
  • Lee, Min Woo (Gyeongnam Science High School) ;
  • Lee, Yeong Seok (Gyeongnam Science High School) ;
  • Lee, Gyu Hwan (Gyeongnam Science High School) ;
  • Kim, Seong Hoon (Department of Radiation Oncology, Yeungnam University Medical Center) ;
  • Kim, Sung Kyu (Department of Radiation Oncology, Yeungnam University Medical Center) ;
  • Park, Jae Won (Department of Radiation Oncology, Yeungnam University Medical Center) ;
  • Yea, Ji Woon (Department of Radiation Oncology, Yeungnam University Medical Center)
  • Received : 2017.09.13
  • Accepted : 2017.09.28
  • Published : 2017.09.30
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Abstract

The purpose of the present study was to develop and evaluate patient-customized helmets with a three-dimensional (3D) printer for radiation therapy of malignant scalp tumors. Computed tomography was performed in a case an Alderson RANDO phantom without bolus (Non_Bolus), in a case with a dental wax bolus on the scalp (Wax_Bolus), and in a case with a patient-customized helmet fabricated using a 3D printer (3D Printing_Bolus); treatment plans for each of the 3 cases were compared. When wax bolus was used to fabricate a bolus, a drier was used to apply heat to the bolus to make the helmet. $3-matic^{(R)}$ (Materialise) was used for modeling and polyamide 12 (PA-12) was used as a material, 3D Printing bolus was fabricated using a HP JET Fusion 3D 4200. The average Hounsfield Unit (HU) for the Wax_Bolus was -100, and that of the 3D Printing_Bolus was -10. The average radiation doses to the normal brain with the Non_Bolus, Wax_Bolus, and 3D Printing_Bolus methods were 36.3%, 40.2%, and 36.9%, and the minimum radiation dose were 0.9%, 1.6%, 1.4%, respectively. The organs at risk dose were not significantly difference. However, the 95% radiation doses into the planning target volume (PTV) were 61.85%, 94.53%, and 97.82%, and the minimum doses were 0%, 77.1%, and 82.8%, respectively. The technique used to fabricate patient-customized helmets with a 3D printer for radiation therapy of malignant scalp tumors is highly useful, and is expected to accurately deliver doses by reducing the air gap between the patient and bolus.

Keywords

References

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