<  Retour au portail Polytechnique Montréal

Radiotherapy immobilization mask molding through the use of 3D-printed head models

Quoc-Viet Vincent Pham, Annie-Pier Lavallee, Alexandru Foias, David Roberge, Ellis Mitrou et Philip Wong

Article de revue (2018)

Document en libre accès dans PolyPublie et chez l'éditeur officiel
[img]
Affichage préliminaire
Libre accès au plein texte de ce document
Version officielle de l'éditeur
Conditions d'utilisation: Creative Commons: Attribution-Pas d'utilisation commerciale (CC BY-NC)
Télécharger (566kB)
Afficher le résumé
Cacher le résumé

Abstract

PURPOSE: To evaluate the feasibility of a workflow free of a simulation appointment using three-dimensional-printed heads and custom immobilization devices. MATERIALS AND METHODS: Simulation computed tomography scans of 11 patients who received radiotherapy for brain tumors were used to create three-dimensional printable models of the patients' heads and neck rests. The models were three-dimensional-printed using fused deposition modeling and reassembled. Then, thermoplastic immobilization masks were molded onto them. These setups were then computed tomography-scanned and compared against the volumes from the original patient computed tomography-scans. Following translational +/- rotational coregistrations of the volumes from three-dimensional-printed models and the patients, the similarities and accuracies of the setups were evaluated using Dice similarity coefficients, Hausdorff distances, differences in centroid positions, and angular deviations. Potential dosimetric differences secondary to inaccuracies in the rotational positioning of patients were calculated. RESULTS: Mean angular deviation of the 3D-printout from the original volume for the Pitch, Yaw, and Roll were 1.1 degrees (standard deviation = 0.77 degrees ), 0.59 degrees (standard deviation = 0.41 degrees ), and 0.79 degrees (standard deviation = 0.86 degrees ), respectively. Following translational + rotational shifts, the mean Dice similarity coefficients of the three-dimensional-printed and original volumes was 0.985 (standard deviation = 0.002) while the mean Hausdorff distance was 0.9 mm (standard error of the mean: 0.1 mm). The mean centroid vector displacement was 0.5 mm (standard deviation: 0.3 mm). Compared to plans that were coregistered using translational + rotational shifts, the D95 of the brain from three-dimensional-printed heads adjusted for TR shifts only differed by -0.1% (standard deviation = 0.2%). CONCLUSIONS: Patient head volumes and positions at simulation computed tomography scans can be accurately reproduced using three-dimensional-printed models, which can be used to mold radiotherapy immobilization masks onto. This strategy, if applied on diagnostic computed tomography scans, may allow symptomatic and frail patients to avoid a computed tomography-simulation and mask molding session in preparation for palliative whole brain radiotherapy.

Mots clés

Aged; Aged, 80 and over; Brain Neoplasms/*radiotherapy; Female; Head/*radiation effects; Humans; Imaging, Three-Dimensional/methods; Immobilization/methods; Male; Middle Aged; Neck/*radiation effects; Patient Positioning/methods; Printing, Three-Dimensional; Radiotherapy Planning, Computer-Assisted/*methods; Tomography, X-Ray Computed/methods; *3D printing; *brain; *immobilization; *palliative; *radiotherapy; *simulation

Sujet(s): 1700 Conception et fabrication > 1700 Conception et fabrication
1900 Génie biomédical > 1900 Génie biomédical
9000 Sciences de la santé > 9000 Sciences de la santé
Département: Département de génie électrique
Institut de génie biomédical
Organismes subventionnaires: Institut de Cancer de Montréal, University of Montreal Department of Radiology, Radiation Oncology and Nuclear Medicine Support Professoral
URL de PolyPublie: https://publications.polymtl.ca/5085/
Titre de la revue: Technology in Cancer Research & Treatment (vol. 17)
Maison d'édition: Sage Journals
DOI: 10.1177/1533033818809051
URL officielle: https://doi.org/10.1177/1533033818809051
Date du dépôt: 04 juil. 2022 09:15
Dernière modification: 26 sept. 2024 11:02
Citer en APA 7: Pham, Q.-V. V., Lavallee, A.-P., Foias, A., Roberge, D., Mitrou, E., & Wong, P. (2018). Radiotherapy immobilization mask molding through the use of 3D-printed head models. Technology in Cancer Research & Treatment, 17, 1533033818 (8 pages). https://doi.org/10.1177/1533033818809051

Statistiques

Total des téléchargements à partir de PolyPublie

Téléchargements par année

Provenance des téléchargements

Dimensions

Actions réservées au personnel

Afficher document Afficher document