hdr surface brachytherapy

High Dose Rate (HDR) surface brachytherapy is a technique used to treat various types of skin lesions including basal and squamous cell carcinoma. Traditional applicators are generic, coming in either circular (Leipzig) or square (Freiburg Flap) geometries. Leipzeig applicators are capable of treating smaller lesions however they are not ideal for irregular surface anatomies and are limited by their size (~3 cm). Freiburg Flap provides a reusable alternative, however the plastic sheets increase the likelihood of air gaps and can be expensive to purchase. Some centres create custom applicators through molding wax with built-in catheters trajectories. Though this method can provide better patient conformity, it is very time consuming and requires a high degree of skilled labor to fabricate.

To address the issues associated with conventional brachytherapy treatment methods, 3D Bolus
introduced the HDR Surface Brachytherapy module which enables users to produce custom
applicators that follow the contours of the patient’s anatomy.

Once the structure is imported to 3D Bolus, the software customs generate customizable catheter positions that run through our the applicators. To avoid jamming of the radioactive source, the user can adjust the positioning angles and surface distance of the trajectories. The user can also add and subtract trajectories and adjust the tunnel radius to cater to various catheter sizes.

Once the user is satisfied with the applicator design, the software conducts a subtraction to create hollow trajectories that fall through out the applicator. After the print is complete, the user simply needs to feed the after-loading catheters through the tunnels built into the applicator and secure with support buttons prior to treatment.

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