Open AccessUse of 3D printers to create a patient‐specific 3D bolus for external beam therapy
Author(s) -
Burleson Sarah,
Baker Jamie,
Hsia An Ting,
Xu Zhigang
Publication year - 2015
Publication title -
journal of applied clinical medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.83
H-Index - 48
ISSN - 1526-9914
DOI - 10.1120/jacmp.v16i3.5247
Subject(s) - imaging phantom , bolus (digestion) , radiation treatment planning , hounsfield scale , materials science , nuclear medicine , linear particle accelerator , biomedical engineering , computer science , beam (structure) , medical physics , medicine , computed tomography , radiation therapy , radiology , optics , surgery , physics
The purpose of this paper is to demonstrate that an inexpensive 3D printer can be used to manufacture patient‐specific bolus for external beam therapy, and to show we can accurately model this printed bolus in our treatment planning system for accurate treatment delivery. Percent depth‐dose measurements and tissue maximum ratios were used to determine the characteristics of the printing materials, acrylonitrile butadiene styrene and polylactic acid, as bolus material with physical density of 1.04 and 1.2 g / cm 3 , and electron density of 3.38 × 10 23 electrons / cm 3 and 3.80 × 10 23 electrons / cm 3 , respectively. Dose plane comparisons using Gafchromic EBT2 film and the RANDO phantom were used to verify accurate treatment planning. We accurately modeled a printing material in Eclipse treatment planning system, assigning it a Hounsfield unit of 260. We were also able to verify accurate treatment planning using gamma analysis for dose plane comparisons. With gamma criteria of 5% dose difference and 2 mm DTA, we were able to have 86.5% points passing, and with gamma criteria of 5% dose difference and 3 mm DTA, we were able to have 95% points passing. We were able to create a patient‐specific bolus using an inexpensive 3D printer and model it in our treatment planning system for accurate treatment delivery. PACS numbers: 87.53.Jw, 87.53.Kn, 87.56.ng