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Melerowitz L, Sreenivasa S, Nachbar M, Stsefanenka A, Beck M, Senger C, Predescu N, Ullah Akram S, Budach V, Zips D, Heiland M, Nahles S, Stromberger C. Design and evaluation of a deep learning-based automatic segmentation of maxillary and mandibular substructures using a 3D U-Net. Clin Transl Radiat Oncol 2024; 47:100780. [PMID: 38712013 PMCID: PMC11070663 DOI: 10.1016/j.ctro.2024.100780] [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: 11/13/2023] [Revised: 04/09/2024] [Accepted: 04/17/2024] [Indexed: 05/08/2024] Open
Abstract
Background Current segmentation approaches for radiation treatment planning in head and neck cancer patients (HNCP) typically consider the entire mandible as an organ at risk, whereas segmentation of the maxilla remains uncommon. Accurate risk assessment for osteoradionecrosis (ORN) or implant-based dental rehabilitation after radiation therapy may require a nuanced analysis of dose distribution in specific mandibular and maxillary segments. Manual segmentation is time-consuming and inconsistent, and there is no definition of jaw subsections. Materials and methods The mandible and maxilla were divided into 12 substructures. The model was developed from 82 computed tomography (CT) scans of HNCP and adopts an encoder-decoder three-dimensional (3D) U-Net structure. The efficiency and accuracy of the automated method were compared against manual segmentation on an additional set of 20 independent CT scans. The evaluation metrics used were the Dice similarity coefficient (DSC), 95% Hausdorff distance (HD95), and surface DSC (sDSC). Results Automated segmentations were performed in a median of 86 s, compared to manual segmentations, which took a median of 53.5 min. The median DSC per substructure ranged from 0.81 to 0.91, and the median HD95 ranged from 1.61 to 4.22. The number of artifacts did not affect these scores. The maxillary substructures showed lower metrics than the mandibular substructures. Conclusions The jaw substructure segmentation demonstrated high accuracy, time efficiency, and promising results in CT scans with and without metal artifacts. This novel model could provide further investigation into dose relationships with ORN or dental implant failure in normal tissue complication prediction models.
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Affiliation(s)
- L. Melerowitz
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Radiation Oncology, Augustenburger Platz 1, 13353, Berlin, Germany
| | - S. Sreenivasa
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Radiation Oncology, Augustenburger Platz 1, 13353, Berlin, Germany
| | - M. Nachbar
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Radiation Oncology, Augustenburger Platz 1, 13353, Berlin, Germany
| | - A. Stsefanenka
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Radiation Oncology, Augustenburger Platz 1, 13353, Berlin, Germany
| | - M. Beck
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Radiation Oncology, Augustenburger Platz 1, 13353, Berlin, Germany
| | - C. Senger
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Radiation Oncology, Augustenburger Platz 1, 13353, Berlin, Germany
| | - N. Predescu
- MVision AI, Paciuksenkatu 29 00270 Helsinki, Finland
| | | | - V. Budach
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Radiation Oncology, Augustenburger Platz 1, 13353, Berlin, Germany
| | - D. Zips
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Radiation Oncology, Augustenburger Platz 1, 13353, Berlin, Germany
| | - M. Heiland
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Oral and Maxillofacial Surgery, Augustenburger Platz 1, 13353, Berlin, Germany
| | - S. Nahles
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Oral and Maxillofacial Surgery, Augustenburger Platz 1, 13353, Berlin, Germany
| | - C. Stromberger
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Radiation Oncology, Augustenburger Platz 1, 13353, Berlin, Germany
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Delpon G, Renouf M, Langé M, Blery P, Dupas C, Longis J, Thariat J, Doré M. Systematic dosimetric evaluation of risk of osteoradionecrosis (DERO): First results of dose reporting for preventing teeth osteoradionecrosis after head and neck irradiation. Cancer Radiother 2023; 27:103-108. [PMID: 36739196 DOI: 10.1016/j.canrad.2022.08.003] [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: 08/02/2022] [Revised: 08/11/2022] [Accepted: 08/23/2022] [Indexed: 02/05/2023]
Abstract
PURPOSE OsteoRadioNecrosis (ORN) is a late complication of radiation for head and neck cancer. Predicting ORN is a major challenge. We developed DERO (Dosimetric Evaluation of Risk of ORN), a semi-automatic tool which reports doses delivered to tooth-bearing sectors, to guide post-therapeutic dental care. We present the method and the first results of a 125-patient prospective cohort. MATERIAL AND METHODS Dosimetric data of patients treated with IMRT for head and neck cancer were prospectively segmented to the DERO algorithm. Four arches corresponding to 8-tooth sectors were semi-automatically generated. Thirty-two cylindrical Regions Of Interest (ROI) corresponding to each tooth and surrounding periodontium were created by linear interpolation. Mean doses (Dmean) of ROI were extracted and included in a database, along with data about primary tumor site, laterality and dose values from organs at risk. Dmean to tooth sectors were computed for molar sectors, (teeth X5 to X8) and anterior sectors (teeth X1 to X4). An individual dose map was generated and delivered to patients and dentists. RESULTS Dosimetric data from 125 patients treated with Tomotherapy® were prospectively collected and analyzed: 9 parotid tumors (PA), 41 Sub-Hyoid tumors (larynx, hypopharynx) (SH), 43 Oropharynx tumors (OR), 32 Oral Cavity tumors (OC). Irradiation was unilateral for 100% of PA tumors (9), 12% of OR tumors (5) and 47% of OC tumors (15). For unilateral cervical irradiation, Dmean in ipsilateral molar sectors was 54Gy for OC tumors, 45Gy for OR tumors, 20Gy for PA tumors. For Oral Cavity bilateral irradiation, Dmean was high in all tooth sectors, 49 to 55Gy. For SH tumors, Dmean in molar sectors was 27Gy. A dose gradient of 10 to 20Gy was observed between molar and anterior sectors whether radiation was uni or bilateral. CONCLUSION Mandibular molar sectors of Oropharynx and Oral Cavity tumors were exposed to high Dmean of 40 to 50Gy. On the other hand, tooth sectors received lower doses for SH radiation. The DERO tool guide post-radiation dental care with a personalized dosimetric cartography to patient. With data update and patient follow-up, we will be able to determine ORN risk after head and neck radiation.
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Affiliation(s)
- G Delpon
- Medical physics department, institut de cancérologie de l'Ouest, Saint-Herblain, France; IMT atlantique, Nantes université, CNRS/IN2P3, Subatech, Nantes, France
| | - M Renouf
- Radiation oncology department, institut de cancérologie de l'Ouest, Saint-Herblain, France
| | - M Langé
- Radiation oncology department, institut de cancérologie de l'Ouest, Saint-Herblain, France
| | - P Blery
- Nantes université, Oniris, Inserm, regenerative medicine and skeleton, RMeS, UMR 1229, Nantes, France; Odontology department, centre hospitalo-universitaire, Nantes, France
| | - C Dupas
- Odontology department, centre hospitalo-universitaire, Nantes, France
| | - J Longis
- Maxillofacial surgery department, centre hospitalo-universitaire, Nantes, France
| | - J Thariat
- Radiation oncology department, Centre François-Baclesse, Caen, France; Laboratoire de physique corpusculaire, IN2P3/ENISAEN-CNRS, Caen, France; Normandie université, Caen, France
| | - M Doré
- Radiation oncology department, institut de cancérologie de l'Ouest, Saint-Herblain, France.
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Foster-Thomas E, Aznar M, Indelicato D, Pan S, Hwang E, Sitch P, Horner K, Smith E, Gaito S. Late Dental Toxicities After Proton Chemoradiation for Rhabdomyosarcoma: A Pediatric Case Report. Int J Part Ther 2022; 9:50-57. [PMID: 36721482 PMCID: PMC9875822 DOI: 10.14338/ijpt-22-00011.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 07/26/2022] [Indexed: 11/17/2022] Open
Abstract
Purpose Radiation therapy is an independent risk factor for adverse sequelae to the oral cavity and dentition in childhood cancer survivors. However, dental toxicities after radiation therapy often are underreported and there are minimal published data on disturbances in tooth development after proton beam therapy (PBT). We present the long-term clinical and radiographic dental findings 8 years after treatment completion for a patient treated with PBT and chemotherapy for rhabdomyosarcoma. Materials and Methods Clinical follow-up data of patients treated with PBT within the Proton Overseas Programme (POP) is stored in a National Database and curated by a dedicated outcomes unit at the Christie NHS PBT center. This case report was identified from the extraction and analysis of data for pediatric head and neck cancer patients in this database for a service evaluation project. Results The permanent dentition in this patient aged 3.5 years at the time of treatment was severely affected with abnormal dental development first observed 3.5 years after treatment completion. PBT delivered mean doses of 30 Gy(RBE = 1.1) to the maxilla and 25.9 Gy(RBE = 1.1) to the mandible. Conclusion Significant dental development abnormalities occurred in this pediatric patient, despite doses in areas being lower than the proposed thresholds in the literature. Improved descriptions of dental toxicities and routine contouring of the maxilla and mandible are needed to correlate dosimetric data. The dose to teeth should be kept as low as reasonably possible in younger patients until the dose thresholds for dental toxicities are known.
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Affiliation(s)
- Emma Foster-Thomas
- Restorative Dentistry, University Dental Hospital of Manchester, Manchester University NHS Foundation Trust, Manchester, UK
| | - Marianne Aznar
- Adaptive Radiotherapy, University of Manchester Division of Clinical Cancer Science, School of Medical Sciences, Manchester, UK
| | - Daniel Indelicato
- Department of Radiation Oncology, University of Florida Health Proton Therapy Institute, Jacksonville, FL, USA
| | - Shermaine Pan
- Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK
| | - Eunji Hwang
- Department of Radiation Oncology, Crown Princess Mary Cancer Centre, Westmead Hospital, Westmead, Australia
| | - Peter Sitch
- Christie Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK
| | - Keith Horner
- Dental and Maxillofacial Radiology, University Dental Hospital of Manchester, Manchester University NHS Foundation Trust, Manchester, UK
| | - Ed Smith
- Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK
| | - Simona Gaito
- The Christie Proton Clinical Outcomes Unit/The University of Manchester Division of Clinical Cancer Science, School of Medical Sciences, Manchester, UK
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Abstract
The delineation of organs at risk is the basis of radiotherapy oncologists' work. Indeed, the knowledge of this delineation enables to better identify the target volumes and to optimize dose distribution, involving the prognosis of the patients but also their future. The learning of this delineation must continue throughout the clinician's career. Some contour changes have appeared with better imaging, some volumes are now required due to development of knowledge of side effects. In addition, the increasing survival time of patients requires to be more systematic and precise in the delineations, both to avoid complications until now exceptional but also because re-irradiations are becoming more and more frequent. We present the update of the recommendations of the French Society for Radiation Oncology (SFRO) on new findings or adaptations to volumes at risk.
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Affiliation(s)
- G Noël
- Department of Radiation Oncology, Institut de Cancérologie Strasbourg Europe (ICANS), 17, rue Albert-Calmette, BP 23025, 67033 Strasbourg, France.
| | - C Le Fèvre
- Department of Radiation Oncology, Institut de Cancérologie Strasbourg Europe (ICANS), 17, rue Albert-Calmette, BP 23025, 67033 Strasbourg, France
| | - D Antoni
- Department of Radiation Oncology, Institut de Cancérologie Strasbourg Europe (ICANS), 17, rue Albert-Calmette, BP 23025, 67033 Strasbourg, France
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Gomes-Silva W, Morais-Faria K, Rivera C, Najas GF, Marta GN, da Conceição Vasconcelos KGM, de Andrade Carvalho H, de Castro G, Brandão TB, Epstein JB, Santos-Silva AR. Impact of radiation on tooth loss in patients with head and neck cancer: a retrospective dosimetric-based study. Oral Surg Oral Med Oral Pathol Oral Radiol 2021; 132:409-417. [PMID: 34366269 DOI: 10.1016/j.oooo.2021.06.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Revised: 06/14/2021] [Accepted: 06/30/2021] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To characterize the dental adverse events after head and neck radiation therapy (HNRT) and to investigate the impact of regional radiation dose upon tooth loss outcomes. STUDY DESIGN A retrospective dosimetric-based analysis was conducted to assess dental events affecting post-HNRT extracted teeth and the impact of 3 different radiation doses (<30 Gy, 30-60 Gy, and >60 Gy) upon tooth loss. In addition, post-HNRT extractions outcomes and mean parotid glands dosimetry and salivary changes were analyzed. RESULTS Sixty-six patients who underwent HNRT were included in the analysis. Radiation caries was the most frequent (67.8%) post-HNRT dental adverse event, and maxillary molars ipsilateral to the tumor were lost earlier compared with the others (P < .001). The odds ratio for post-HNRT tooth extraction risk was approximately 3-fold higher for teeth exposed to >60 Gy (confidence interval, 1.56-5.35; P < .001), followed by an increased risk of delayed healing and osteoradionecrosis (ORN) in sites receiving doses above 50 Gy. CONCLUSIONS Radiation caries was the major cause of dental extractions after HNRT, and the dosimetric analysis suggested that a high dose of radiation may negatively impact the dentition of survivors of head and neck cancer, increasing the risk of tooth loss and ORN.
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Affiliation(s)
- Wagner Gomes-Silva
- Dental Oncology Service, Instituto do Câncer do Estado de São Paulo (ICESP), Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil; Oral Diagnosis Department, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo, Brazil.
| | - Karina Morais-Faria
- Dental Oncology Service, Instituto do Câncer do Estado de São Paulo (ICESP), Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil; Oral Diagnosis Department, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo, Brazil
| | - César Rivera
- Oral Diagnosis Department, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo, Brazil
| | - Gabriel Faria Najas
- Division of Radiation Oncology, Department of Radiology and Oncology, Instituto do Câncer do Estado de São Paulo, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Gustavo Nader Marta
- Division of Radiation Oncology, Department of Radiology and Oncology, Instituto do Câncer do Estado de São Paulo, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | | | - Heloisa de Andrade Carvalho
- Department of Radiation and Oncology, Instituto de Radiologia do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (HC-FMUSP), São Paulo, Brazil
| | - Gilberto de Castro
- Division of Clinical Oncology, Department of Radiology and Oncology, Instituto do Câncer do Estado de São Paulo, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Thaís Bianca Brandão
- Dental Oncology Service, Instituto do Câncer do Estado de São Paulo (ICESP), Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil; Oral Diagnosis Department, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo, Brazil
| | - Joel B Epstein
- Samuel Oschin Comprehensive Cancer Instititute, Cedars-Sinai Medical Center, Los Angeles, CA, USA; City of Hope Comprehensive Cancer Center, Duarte, CA, USA
| | - Alan Roger Santos-Silva
- Oral Diagnosis Department, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo, Brazil
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Rouers M, Bornert F, Truntzer P, Dubourg S, Bourrier C, Antoni D, Noël G. Ability to Propose Optimal Prosthetic Rehabilitation can be Improved by Discussion between the Dentist and Radiation Oncologist Regarding Upstream Dosimetry. Eur J Dent 2019; 13:88-94. [PMID: 31170766 PMCID: PMC6635961 DOI: 10.1055/s-0039-1688523] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Objective
Improvement of dental rehabilitation for patients who have undergone radiation therapy requires knowledge of the dose in the maxillary and mandible bones.
Materials and Methods
Forty-three patients with head and neck cancers underwent evaluation for dental rehabilitation before radiation treatment dosimetry. The delivered dose to the maxilla and mandible was determined. From the dose data in the literature, three levels of risk of implant failure were defined. According to the delivered doses, the authors calculated the percentage of patients who could be fully rehabilitated with an implant, as proposed by the dentist before radiation planning.
Results
Before dosimetry calculation, all of the completely edentulous arches and 94 partially edentulous (PESs) sextants could be optimally rehabilitated. After dose calculation, among the 14 arches of 7 patients who were completely edentulous, according to the mean and maximal delivered doses, 11 arches (78.6%) and 7 arches (50%) could receive an optimal prosthesis, respectively. For the three patients, who were PESs but with one arch that was completely edentulous, according to the mean and maximal delivered doses, one arch for each dose condition could receive an optimal prosthesis. Among the 94 PESs sextants, according to the mean and maximal delivered doses, 41 (43.6%) and 24 (25.5%) sextants could receive an optimal prosthesis, respectively.
Conclusion
By determining the sites of implantation before dosimetry, the radiation oncologist could shield specified areas, potentially improving the possibilities for dental rehabilitation. The dialogue between the dentist and the radiation oncologist can improve the possibilities for implants and decrease the risk of unsafe implantation.
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Affiliation(s)
- Mélanie Rouers
- Faculty of Dental Medicine, 1 Place de l'Hôpital, Strasbourg, France
| | - Fabien Bornert
- Faculty of Dental Medicine, 1 Place de l'Hôpital, Strasbourg, France
| | - Pierre Truntzer
- University Radiation Department, Centre Paul Strauss, Strasbourg, France
| | - Sarah Dubourg
- Faculty of Dental Medicine, 1 Place de l'Hôpital, Strasbourg, France
| | - Cyrielle Bourrier
- University Radiation Department, Centre Paul Strauss, Strasbourg, France
| | - Delphine Antoni
- University Radiation Department, Centre Paul Strauss, Strasbourg, France.,Strasbourg University, Radiobiology Lab, Centre Paul Strauss, Strasbourg, France
| | - Georges Noël
- University Radiation Department, Centre Paul Strauss, Strasbourg, France.,Strasbourg University, Radiobiology Lab, Centre Paul Strauss, Strasbourg, France
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O'Cathail SM, Karir N, Shah K. Optimising volumetric arc radiotherapy for dental rehabilitation in oropharynx cancer - A retrospective dosimetry review and feasibility planning study. Oral Oncol 2018; 76:16-21. [PMID: 29290281 DOI: 10.1016/j.oraloncology.2017.11.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 11/17/2017] [Accepted: 11/20/2017] [Indexed: 12/25/2022]
Abstract
PURPOSE To assess the dosimetry to dentally relevant substructures within the mandible/maxilla, establish the predictors of increased mean anterior mandible dose and assess the feasibility of rationale optimisation of dose to the anterior mandible (AM) volume to aid reconstructive dental surgery planning, where the AM is a critical structure. MATERIALS AND METHODS In a cohort of radically treated oropharynx cancer patients we conducted a retrospective dosimetry analysis of mandible/maxilla volumes, created using a published atlas. Comparisons of mean AM dose and clinical parameters between groups were tested using Wilcoxon rank-sum and Kruskal-Wallis tests. A multivariate linear regression model was created to assess independent predictors of increased mean AM dose. Patients with a mean AM dose over 37.5 Gy were included in feasibility planning study to test the hypothesis that it is possible to safely limit the dose whilst maintaining dose tolerances for other organs at risk. RESULTS 57 patients were included. Median AM mean dose was 32.2 Gy (IQR 27.7-38.7). T stage, N stage and inclusion of Level 1B were significantly associated with increased mean AM dose. Only T stage (p = .0132) and Level Ib inclusion (p = .018) remained significant in the linear regression model. 88% of plans, all of which included Level Ib, were successfully re-optimised without breaching accepted constraints. CONCLUSIONS Oropharynx cancer patients with advanced T stage and who require Level Ib treatment receive increased mean AM dose, potentially limiting surgical dental rehabilitation options. The majority of patients can be optimised safely with appropriate AM contouring.
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Affiliation(s)
- Sean M O'Cathail
- Oxford Institute of Radiation Oncology, University of Oxford, Old Road, OX3 7DQ, United Kingdom.
| | - Naveen Karir
- Dept. of Restorative Dentistry, John Radcliffe Hospital, Oxford University Hospitals NHS Foundation Trust, OX3 7DQ, United Kingdom
| | - Ketan Shah
- Dept. of Oncology, Churchill Hospital, Oxford University NHS Foundation Trust, OX3 7DQ, United Kingdom
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