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Kamio Y, Roy MÈ, Morgan LA, Barkati M, Beauchemin MC, DeBlois F, Basaric B, Carrier JF, Bedwani S. The Montreal split ring applicator: Towards highly adaptive gynecological brachytherapy using 3D-printed biocompatible patient-specific interstitial caps. J Contemp Brachytherapy 2023; 15:453-464. [PMID: 38230395 PMCID: PMC10789156 DOI: 10.5114/jcb.2023.133676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Accepted: 11/15/2023] [Indexed: 01/18/2024] Open
Abstract
Purpose The addition of interstitial (IS) needles to intra-cavitary (IC) brachytherapy applicators is associated with improved outcomes in locally advanced cervical cancers involving parametrial tumor extensions. The purpose of this work was to validate a clinical workflow involving 3D-printed caps for a commercial IC split ring applicator that enable using IS needle trajectories tailored to each treatment. Material and methods A dedicated software module was developed in this work allowing users to design patient-specific IS caps without knowledge of computer-aided design (CAD) software. This software module was integrated to 3D Brachy, a commercial software developed by Adaptiiv Medical Technologies Inc. For validation of the workflow, CAD models of ground truth caps with five IS needle trajectories were designed with Fusion 360™, 3D-printed, assembled with a split ring applicator, and CT-scanned with radio-opaque markers. 3D Brachy was then applied to generate a replica based on trajectories reconstructed from the radio-opaque markers. A comparison between ground truth and replicated IS needle trajectories was done using intersection points with planes at the level of the cervix (z = 0 cm) and a representative needle depth (z = 3 cm). Results Prototypes of interstitial caps 3D-printed in both BioMed Amber and BioMed Clear SLA resins were tested to be functional both pre- and post-sterilization for IS needles with obliquity angles ≤ 45°. Distance-to-agreement at z = 0 cm and 3 cm as well as deviations in pitch and yaw angles of the five IS needle trajectories were found to have mean values of 3.3 ±2.1 mm, 7.3 ±2.0 mm, 2.9° ±2.3°, and 7.0° ±7.0°, respectively. Conclusions The clinical workflow for image-guided adaptive cervical cancer brachytherapy using the Montreal split ring applicator was validated.
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Affiliation(s)
- Yuji Kamio
- Centre Hospitalier de l’Université de Montréal (CHUM), Montréal, QC, Canada
- Centre de Recherche du CHUM (CRCHUM), Montréal, QC, Canada
- Département de Pharmacologie et Physiologie, Université de Montréal, Montréal, QC, Canada
| | - Marie-Ève Roy
- Centre Hospitalier de l’Université de Montréal (CHUM), Montréal, QC, Canada
| | | | - Maroie Barkati
- Centre Hospitalier de l’Université de Montréal (CHUM), Montréal, QC, Canada
| | | | - François DeBlois
- Centre Hospitalier de l’Université de Montréal (CHUM), Montréal, QC, Canada
- Centre de Recherche du CHUM (CRCHUM), Montréal, QC, Canada
- Département de Physique, Université de Montréal, Montréal, QC, Canada
| | - Borko Basaric
- Adaptiiv Medical Technologies Inc., Halifax, NS, Canada
| | - Jean-François Carrier
- Centre Hospitalier de l’Université de Montréal (CHUM), Montréal, QC, Canada
- Centre de Recherche du CHUM (CRCHUM), Montréal, QC, Canada
- Département de Physique, Université de Montréal, Montréal, QC, Canada
| | - Stéphane Bedwani
- Centre Hospitalier de l’Université de Montréal (CHUM), Montréal, QC, Canada
- Centre de Recherche du CHUM (CRCHUM), Montréal, QC, Canada
- Département de Physique, Université de Montréal, Montréal, QC, Canada
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Segedin B, Kobav M, Zobec Logar HB. The Use of 3D Printing Technology in Gynaecological Brachytherapy-A Narrative Review. Cancers (Basel) 2023; 15:4165. [PMID: 37627193 PMCID: PMC10452889 DOI: 10.3390/cancers15164165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 08/13/2023] [Accepted: 08/15/2023] [Indexed: 08/27/2023] Open
Abstract
Radiation therapy, including image-guided adaptive brachytherapy based on magnetic resonance imaging, is the standard of care in locally advanced cervical and vaginal cancer and part of the treatment in other primary and recurrent gynaecological tumours. Tumour control probability increases with dose and brachytherapy is the optimal technique to increase the dose to the target volume while maintaining dose constraints to organs at risk. The use of interstitial needles is now one of the quality indicators for cervical cancer brachytherapy and needles should optimally be used in ≥60% of patients. Commercially available applicators sometimes cannot be used because of anatomical barriers or do not allow adequate target volume coverage due to tumour size or topography. Over the last five to ten years, 3D printing has been increasingly used for manufacturing of customised applicators in brachytherapy, with gynaecological tumours being the most common indication. We present the rationale, techniques and current clinical evidence for the use of 3D-printed applicators in gynaecological brachytherapy.
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Affiliation(s)
- Barbara Segedin
- Department of Radiation Oncology, Institute of Oncology Ljubljana, 1000 Ljubljana, Slovenia; (M.K.); (H.B.Z.L.)
- Faculty of Medicine, University of Ljubljana, 1000 Ljubljana, Slovenia
| | - Manja Kobav
- Department of Radiation Oncology, Institute of Oncology Ljubljana, 1000 Ljubljana, Slovenia; (M.K.); (H.B.Z.L.)
| | - Helena Barbara Zobec Logar
- Department of Radiation Oncology, Institute of Oncology Ljubljana, 1000 Ljubljana, Slovenia; (M.K.); (H.B.Z.L.)
- Faculty of Medicine, University of Ljubljana, 1000 Ljubljana, Slovenia
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