Using 3D Printing to Design Reusable Boluses for Patient OSLD Measurements
C Kabat1*, I Alecu2, H Paschal1, N Kirby1, S Stathakis1, N Papanikolaou1, (1) UT Health San Antonio ,San Antonio, TX, (2) AROS, LLC, Allen, TX
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PO-GePV-T-248 (Sunday, 7/10/2022) [Eastern Time (GMT-4)]
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Purpose: In-vivo dosimetry with optically stimulated luminescent detectors (OSLDs) has shown increased accuracy when combined with bolus. However, creating bolus for each OSLD is time and labor-intensive and can cause sanitation concerns during reuse. A 3-D printed bolus can ensure the same dosimetric accuracy, is easier to prepare, can be sterilized, and retains a fixed position within the bolus.
Methods: Medical grade thermoplastic polyurethane (TPU) filament with a density of 1.1g/cm³ was used to create a simple rectangular shape with dimensions 3.5x3.5x0.5 cm³. A cavity insert was designed into the printed rectangular holder to allow for consistent central placement of nanoDotᵀᴹ OSLDs. Additionally, a 3D printed insert tray was generated to allow OSLDs to fit tightly into the bolus holder. The 3D printed design was verified by irradiating with OSLDs inserted and directly compared with a previously used standard bolus.
Results: The OSLDs encased in 3D-printed bolus agreed with our clinical standard bolus within 2%. The 3D printed OSLD holder is simple to use, can be easily disinfected, and shows no deformation within the material. Additionally, the 3D-printed OSLD holder is inexpensive, costing only USD .50 per holder. On average, it took one hour to print a single OSLD holder. This could be shortened by printing multiple batches at a time.
Conclusion: 3D-printed OSLD holders are inexpensive, dosimetrically similar to current clinical standards, and easily sanitized. In our experience, using a 3D printed bolus has increased efficiency by reducing preparation time.
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