eISSN: 2081-2841
ISSN: 1689-832X
Journal of Contemporary Brachytherapy
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5/2021
vol. 13
 
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abstract:
Original paper

3D-printed surface applicators for brachytherapy: a phantom study

Grzegorz Bielęda
1, 2
,
Anna Marach
2
,
Marek Boehlke
3
,
Grzegorz Zwierzchowski
1, 2
,
Julian Malicki
1, 2

1.
Electroradiology Department, Poznan University of Medical Sciences, Poznan, Poland
2.
Medical Physics Department, Greater Poland Cancer Centre, Poznan, Poland
3.
Medical Physics Department, West Pomeranian Oncology Center, Strzałowska, Szczecin, Poland
J Contemp Brachytherapy 2021; 13, 5: 549–562
Online publish date: 2021/10/25
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Introduction
Brachytherapy is a great alternative for restrictive surgical procedures in facial cancers. Moreover, dose distribution is more beneficial compared with teleradiotherapy during treatment of lesions located on anatomical curves. However, repetitiveness of application is the main issue associated with using commercial applicators. The risk of its displacement is very unfavorable due to large dose gradients in brachytherapy. The aim of this study was to develop a process of preparation of applicators using 3D printing technology.

Material and methods
In planning system, circular volumes near the nose, eye, and ear were determined on transverse layers of an anthropomorphic phantom. Next, boluses with a thickness of 5 mm and 10 mm were designed for each of the layers. Channels in the 10 mm bolus were designed in such a way to place the catheters into the layers. Prepared applicators were printed using polylactic acid (PLA) filament. Plans to irradiate the films for their calibration and plans for treatment prepared in the treatment planning system were conducted. A special phantom was created to calibrate the radiochromic films. Dose distribution around the designed applicators was measured in an anthropomorphic phantom using films within the layers of phantom. Comparison of doses was performed with two-dimensional gamma analysis using OmniPro I’mRT software.

Results
The obtained results confirmed compliance of the planned and measured doses in 92%; the analysis of gamma parameter showed 1%/1 mm for acceptability level of 95%. Moreover, the initial dosimetric analysis for gamma criteria with 2%/2 mm showed compliance at 99%.

Conclusions
The results of the present study confirm potential clinical usefulness of the applicators obtained with the use of 3D printing for brachytherapy.

keywords:

3D printing, applicator design, superficial brachytherapy

 
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