O L Dancewicz1, S R Sylvander2, T S Markwell3, S B Crowe4, J V Trapp5. 1. School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane 4000, Australia; Department of Nuclear Medicine and Specialised PET Services Queensland, Royal Brisbane and Women's Hospital, Herston 4029, Australia. Electronic address: odancewicz@gmail.com. 2. Cancer Care Services, Royal Brisbane and Women's Hospital, Herston 4029, Australia. 3. Radiation Oncology Mater Center, South Brisbane 4101, Australia. 4. School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane 4000, Australia; Cancer Care Services, Royal Brisbane and Women's Hospital, Herston 4029, Australia. 5. School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane 4000, Australia.
Abstract
PURPOSE: This study evaluates the radiological properties of different 3D printing materials for a range of photon energies, including kV and MV CT imaging and MV radiotherapy beams. METHODS: The CT values of a number of materials were measured on an Aquilion One CT scanner at 80kVp, 120kVp and a Tomotherapy Hi Art MVCT imaging beam. Attenuation of the materials in a 6MV radiotherapy beam was investigated. RESULTS: Plastic filaments printed with various infill densities have CT values of -743±4, -580±1 and -113±3 in 120kVp CT images which approximate the CT values of low-density lung, high-density lung and soft tissue respectively. Metal-infused plastic filaments printed with a 90% infill density have CT values of 658±1 and 739±6 in MVCT images which approximate the attenuation of cortical bone. The effective relative electron density REDeff is used to describe the attenuation of a megavoltage treatment beam, taking into account effects relating to the atomic number and mass density of the material. Plastic filaments printed with a 90% infill density have REDeff values of 1.02±0.03 and 0.94±0.02 which approximate the relative electron density RED of soft tissue. Printed resins have REDeff values of 1.11±0.03 and 1.09±0.03 which approximate the RED of bone mineral. CONCLUSIONS: 3D printers can model a variety of body tissues which can be used to create phantoms useful for both imaging and dosimetric studies. Crown
PURPOSE: This study evaluates the radiological properties of different 3D printing materials for a range of photon energies, including kV and MV CT imaging and MV radiotherapy beams. METHODS: The CT values of a number of materials were measured on an Aquilion One CT scanner at 80kVp, 120kVp and a Tomotherapy Hi Art MVCT imaging beam. Attenuation of the materials in a 6MV radiotherapy beam was investigated. RESULTS: Plastic filaments printed with various infill densities have CT values of -743±4, -580±1 and -113±3 in 120kVp CT images which approximate the CT values of low-density lung, high-density lung and soft tissue respectively. Metal-infused plastic filaments printed with a 90% infill density have CT values of 658±1 and 739±6 in MVCT images which approximate the attenuation of cortical bone. The effective relative electron density REDeff is used to describe the attenuation of a megavoltage treatment beam, taking into account effects relating to the atomic number and mass density of the material. Plastic filaments printed with a 90% infill density have REDeff values of 1.02±0.03 and 0.94±0.02 which approximate the relative electron density RED of soft tissue. Printed resins have REDeff values of 1.11±0.03 and 1.09±0.03 which approximate the RED of bone mineral. CONCLUSIONS: 3D printers can model a variety of body tissues which can be used to create phantoms useful for both imaging and dosimetric studies. Crown
Authors: Daniel F Craft; Peter Balter; Wendy Woodward; Stephen F Kry; Mohammad Salehpour; Rachel Ger; Mary Peters; Garrett Baltz; Erik Traneus; Rebecca M Howell Journal: Phys Imaging Radiat Oncol Date: 2018-11-29
Authors: Scott B Crowe; Jane Bennett; Marika Lathouras; Craig M Lancaster; Steven R Sylvander; Benjamin Chua; Catherine S Bettington; Charles Y Lin; Tanya Kairn Journal: Phys Imaging Radiat Oncol Date: 2020-05-20