Mr. Ian Cumming Profile

Ian Cumming

at Queen's University

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Proceedings Article | 18 March 2015 Paper

3D-printed surface mould applicator for high-dose-rate brachytherapy

Mark Schumacher, Andras Lasso, Ian Cumming, Adam Rankin, Conrad Falkson, L. John Schreiner, Chandra Joshi, Gabor Fichtinger

Proceedings Volume 9415, 94152E (2015) https://doi.org/10.1117/12.2082543

KEYWORDS: Computed tomography, Calibration, 3D modeling, Visualization, 3D printing, Process modeling, Natural surfaces, Skin, Manufacturing, Cancer

Read Abstract +

In contemporary high-dose-rate brachytherapy treatment of superficial tumors, catheters are placed in a wax mould. The creation of current wax models is a difficult and time consuming proces.The irradiation plan can only be computed post-construction and requires a second CT scan. In case no satisfactory dose plan can be created, the mould is discarded and the process is repeated. The objective of this work was to develop an automated method to replace suboptimal wax moulding. We developed a method to design and manufacture moulds that guarantee to yield satisfactory dosimetry. A 3D-printed mould with channels for the catheters designed from the patient’s CT and mounted on a patient-specific thermoplastic mesh mask. The mould planner was implemented as an open-source module in the 3D Slicer platform. Series of test moulds were created to accommodate standard brachytherapy catheters of 1.70mm diameter. A calibration object was used to conclude that tunnels with a diameter of 2.25mm, minimum 12mm radius of curvature, and 1.0mm open channel gave the best fit for this printer/catheter combination. Moulds were created from the CT scan of thermoplastic mesh masks of actual patients. The patient-specific moulds have been visually verified to fit on the thermoplastic meshes. The masks were visually shown to fit onto the thermoplastic meshes, next the resulting dosimetry will have to be compared with treatment plans and dosimetry achieved with conventional wax moulds in order to validate our 3D printed moulds.

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