Antonio Otal Palací, #StudentSeminar: Applicator Reconstruction in Gynecological Brachytherapy on MRI

jueves 6 jul. 2023 15:00 → 17:00 Europe/Madrid

1001-Primera-1-1-1 - Paterna. Seminario (Universe)

Locally advanced cervical cancer is typically treated with radiochemotherapy, including external beam radiotherapy, brachytherapy, and concurrent chemotherapy. Image Guided Adaptive Brachytherapy (IGABT) with repetitive MRI scans is now considered the preferred global standard, replacing 2D brachytherapy.

In image-guided brachytherapy, accurate applicator reconstruction is crucial to minimize dose deviations in the target and organs at risk caused by steep dose gradients. Implementing appropriate applicator commissioning and reconstruction methods is vital to avoid errors and reduce uncertainties.

However, while the source channel is well visualized in CT images, applicator reconstruction is more challenging when using MR images. Commercial dummy sources for MRI are limited, and image artefacts may occur with titanium applicators.

An alternative to direct path reconstruction is the use of applicator libraries. Using a three-dimensional model of the gynaecological applicator positioned on the MRI avoids the need to see the channel through which the brachytherapy source will circulate and the most distal stopping point of the brachytherapy source.

This talk aims to show that it is possible to use applicator libraries for non-rigid applicators and the interstitial part of such applicators and to use them to create virtual reconstructions.

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