AI Article Synopsis
- The study investigates the dosimetric properties of 3D-printed plates made from different materials (TPU and PLA) and varying infill percentages (5%-20%) to understand their impact on radiation dose delivery.
- Testing involved measuring Hounsfield unit distributions and Percentage Depth Dose (PDD) at various depths using specific equipment, and comparing measurements with calculations from treatment planning systems.
- Results indicated that higher infill percentages improved dose distribution in the build-up region, with minimal difference in performance between the materials, ultimately concluding that 3D-printed boluses enhance dose delivery effectively.
Article Abstract
Purpose: Dosimetric characteristics of 3D-printed plates using different infill percentage and materials was the purpose of our study.
Methods: Test plates with 5%, 10%, 15% and 20% honeycomb structure infill were fabricated using TPU and PLA polymers. The Hounsfield unit distribution was determined using a Python script. Percentage Depth Dose (PDD) distribution in the build-up region was measured with the Markus plane-parallel ionization chamber for an open 10x10 cm field of 6 MV. PDD was measured at a depth of 1 mm, 5 mm, 10 mm and 15 mm. Measurements were compared with Eclipse treatment planning system calculations using AAA and Acuros XB algorithms.
Results: The mean HU for CT scans of 3D-printed TPU plates increased with percentage infill increase from -739 HU for 5% to -399 HU for 20%. Differences between the average HU for TPU and PLA did not exceed 2% for all percentage infills. Even using a plate with the lowest infill PDD at 1 mm depth increase from 44.7% (without a plate) to 76.9% for TPU and 76.6% for PLA. Infill percentage did not affect the dose at depths greater than 5 mm. Differences between measurements and TPS calculations were less than 4.1% for both materials, regardless of the infill percentage and depth.
Conclusions: The use of 3D-printed light boluses increases the dose in the build-up region, which was shown based on the dosimetric measurements and TPS calculations.
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| http://dx.doi.org/10.1016/j.ejmp.2023.102600 | DOI Listing |
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