Dosimetric characterization of 3D printed bolus at different infill percentage for external photon beam radiotherapy

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9 Citations (Scopus)

Abstract

Background and purpose 3D printing is rapidly evolving and further assessment of materials and technique is required for clinical applications. We evaluated 3D printed boluses with acrylonitrile butadiene styrene (ABS) and polylactide (PLA) at different infill percentage. Material and methods A low-cost 3D printer was used. The influence of the air inclusion within the 3D printed boluses was assessed thoroughly both with treatment planning system (TPS) and with physical measurements. For each bolus, two treatment plans were calculated with Monte Carlo algorithm, considering the computed tomography (CT) scan of the 3D printed bolus or modelling the 3D printed bolus as a virtual bolus structure with a homogeneous density. Depth dose measurements were performed with Gafchromic films. Results High infill percentage corresponds to high density and high homogeneity within bolus material. The approximation of the bolus in the TPS as a homogeneous material is satisfying for infill percentages greater than 20%. Measurements performed with PLA boluses are more comparable to the TPS calculated profiles. For boluses printed at 40% and 60% infill, the discrepancies between calculated and measured dose distribution are within 5%. Conclusions 3D printing technology allows modulating the shift of the build-up region by tuning the infill percentage of the 3D printed bolus in order to improve superficial target coverage.

Original languageEnglish
Pages (from-to)25-32
Number of pages8
JournalPhysica Medica
Volume39
DOIs
Publication statusPublished - Jul 1 2017

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photon beams
Photons
radiation therapy
Radiotherapy
planning
printing
Acrylonitrile
dosage
Styrene
printers
acrylonitriles
Therapeutics
butadiene
styrenes
homogeneity
tomography
Air
tuning
Tomography
inclusions

Keywords

  • 3D printing
  • Bolus
  • Density
  • External photon beam radiotherapy
  • Infill percentage
  • Low-cost 3D printer

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging
  • Physics and Astronomy(all)

Cite this

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title = "Dosimetric characterization of 3D printed bolus at different infill percentage for external photon beam radiotherapy",
abstract = "Background and purpose 3D printing is rapidly evolving and further assessment of materials and technique is required for clinical applications. We evaluated 3D printed boluses with acrylonitrile butadiene styrene (ABS) and polylactide (PLA) at different infill percentage. Material and methods A low-cost 3D printer was used. The influence of the air inclusion within the 3D printed boluses was assessed thoroughly both with treatment planning system (TPS) and with physical measurements. For each bolus, two treatment plans were calculated with Monte Carlo algorithm, considering the computed tomography (CT) scan of the 3D printed bolus or modelling the 3D printed bolus as a virtual bolus structure with a homogeneous density. Depth dose measurements were performed with Gafchromic films. Results High infill percentage corresponds to high density and high homogeneity within bolus material. The approximation of the bolus in the TPS as a homogeneous material is satisfying for infill percentages greater than 20{\%}. Measurements performed with PLA boluses are more comparable to the TPS calculated profiles. For boluses printed at 40{\%} and 60{\%} infill, the discrepancies between calculated and measured dose distribution are within 5{\%}. Conclusions 3D printing technology allows modulating the shift of the build-up region by tuning the infill percentage of the 3D printed bolus in order to improve superficial target coverage.",
keywords = "3D printing, Bolus, Density, External photon beam radiotherapy, Infill percentage, Low-cost 3D printer",
author = "Rosalinda Ricotti and Delia Ciardo and Floriana Pansini and Alessia Bazani and Stefania Comi and Ruggero Spoto and Samuele Noris and Federica Cattani and Guido Baroni and Roberto Orecchia and Andrea Vavassori and {Alicja Jereczek-Fossa}, Barbara",
year = "2017",
month = "7",
day = "1",
doi = "10.1016/j.ejmp.2017.06.004",
language = "English",
volume = "39",
pages = "25--32",
journal = "Physica Medica",
issn = "1120-1797",
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T1 - Dosimetric characterization of 3D printed bolus at different infill percentage for external photon beam radiotherapy

AU - Ricotti, Rosalinda

AU - Ciardo, Delia

AU - Pansini, Floriana

AU - Bazani, Alessia

AU - Comi, Stefania

AU - Spoto, Ruggero

AU - Noris, Samuele

AU - Cattani, Federica

AU - Baroni, Guido

AU - Orecchia, Roberto

AU - Vavassori, Andrea

AU - Alicja Jereczek-Fossa, Barbara

PY - 2017/7/1

Y1 - 2017/7/1

N2 - Background and purpose 3D printing is rapidly evolving and further assessment of materials and technique is required for clinical applications. We evaluated 3D printed boluses with acrylonitrile butadiene styrene (ABS) and polylactide (PLA) at different infill percentage. Material and methods A low-cost 3D printer was used. The influence of the air inclusion within the 3D printed boluses was assessed thoroughly both with treatment planning system (TPS) and with physical measurements. For each bolus, two treatment plans were calculated with Monte Carlo algorithm, considering the computed tomography (CT) scan of the 3D printed bolus or modelling the 3D printed bolus as a virtual bolus structure with a homogeneous density. Depth dose measurements were performed with Gafchromic films. Results High infill percentage corresponds to high density and high homogeneity within bolus material. The approximation of the bolus in the TPS as a homogeneous material is satisfying for infill percentages greater than 20%. Measurements performed with PLA boluses are more comparable to the TPS calculated profiles. For boluses printed at 40% and 60% infill, the discrepancies between calculated and measured dose distribution are within 5%. Conclusions 3D printing technology allows modulating the shift of the build-up region by tuning the infill percentage of the 3D printed bolus in order to improve superficial target coverage.

AB - Background and purpose 3D printing is rapidly evolving and further assessment of materials and technique is required for clinical applications. We evaluated 3D printed boluses with acrylonitrile butadiene styrene (ABS) and polylactide (PLA) at different infill percentage. Material and methods A low-cost 3D printer was used. The influence of the air inclusion within the 3D printed boluses was assessed thoroughly both with treatment planning system (TPS) and with physical measurements. For each bolus, two treatment plans were calculated with Monte Carlo algorithm, considering the computed tomography (CT) scan of the 3D printed bolus or modelling the 3D printed bolus as a virtual bolus structure with a homogeneous density. Depth dose measurements were performed with Gafchromic films. Results High infill percentage corresponds to high density and high homogeneity within bolus material. The approximation of the bolus in the TPS as a homogeneous material is satisfying for infill percentages greater than 20%. Measurements performed with PLA boluses are more comparable to the TPS calculated profiles. For boluses printed at 40% and 60% infill, the discrepancies between calculated and measured dose distribution are within 5%. Conclusions 3D printing technology allows modulating the shift of the build-up region by tuning the infill percentage of the 3D printed bolus in order to improve superficial target coverage.

KW - 3D printing

KW - Bolus

KW - Density

KW - External photon beam radiotherapy

KW - Infill percentage

KW - Low-cost 3D printer

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