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3D Planning and Printing of Patient Specific Implants for Reconstruction of Bony Defects

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A customized bolus produced using a 3-dimensional printer for radiotherapy.

Shin-Wook Kim¹, Hun-Joo Shin¹, Chul Seung Kay¹

¹Radiation Oncology, Incheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.

|October 23, 2014

Summary

Customized 3D printed boluses offer improved skin contact in radiotherapy, overcoming air gap issues with traditional flat boluses. This innovation shows potential for enhanced dose escalation and patient treatment.

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Area of Science:

Medical Physics
Radiotherapy Technology
3D Printing Applications

Background:

Flat boluses in high-energy radiotherapy aim to mitigate the skin sparing effect.
Imperfect contact between conventional flat boluses and irregular patient skin creates air gaps, compromising treatment efficacy.
Customized solutions are needed to address the limitations of standard radiotherapy boluses.

Purpose of the Study:

To fabricate and evaluate the feasibility of a customized 3D printed bolus for radiotherapy.
To compare the performance of 3D printed flat and customized boluses against established benchmarks.
To assess the potential of 3D printed boluses in improving dose delivery and patient contact.

Main Methods:

Two types of 3D printed boluses were designed: a flat bolus for a Blue water phantom and a customized bolus for a RANDO phantom.
Physical quality and dosimetric parameters (D1.5 cm, D5 cm, D10 cm) of the flat bolus were assessed.
Quality and clinical feasibility of the customized bolus were evaluated through visual inspection and dosimetric analysis (Dmax, Dmin, Dmean, D90%, V90%).

Main Results:

The 3D printed flat bolus demonstrated utility as a dose-escalating material, comparable to commercial flat boluses.
The 3D printed customized bolus achieved good dose escalation and superior contact with the irregular RANDO phantom surface.
Dosimetric evaluations confirmed the effectiveness of both 3D printed bolus designs.

Conclusions:

3D printed customized boluses show promise as a viable alternative to commercially available flat boluses.
The fabrication of patient-specific boluses using 3D printing technology can enhance radiotherapy precision.
This technology offers potential for improved treatment outcomes by ensuring optimal contact and dose delivery.