Characterizing 3D printing in the fabrication of variable density phantoms for quality assurance of radiotherapy

Joseph Madamesila, Philip McGeachy, J. Eduardo Villarreal Barajas, Rao Khan

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

Purpose: To present characterization, process flow, and applications of 3D fabricated low density phantoms for radiotherapy quality assurance (QA). Material and methods: A Rostock 3D printer using polystyrene was employed to print slabs of varying relative electron densities (0.18-0.75). A CT scan was used to calibrate infill-to-density and characterize uniformity of the print. Two printed low relative density rods (0.18, 0.52) were benchmarked against a commercial CT-electron-density phantom. Density scaling of Anisotropic Analytical Algorithm (AAA) was tested with EBT3 film for a 0.57 slab. Gamma criterion of 3% and 3 mm was used for analysis. Results: 3D printed slabs demonstrated uniformity for densities 0.4-0.75. The printed 0.52 rod had close agreement with the commercial phantom. Dosimetric comparison for 0.57 density slab showed >95% agreement between calculation and measurements. Conclusion: 3D printing allows fabrication of variable density phantoms for QA needs of a small clinic.

Original languageEnglish
Pages (from-to)242-247
Number of pages6
JournalPhysica Medica
Volume32
Issue number1
DOIs
StatePublished - Jan 1 2016

Keywords

  • 3D printing
  • Desktop phantom fabrication
  • Dose calculation algorithm
  • Experimental verification

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