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Abstract
Mitigation of irradiation injury to salivary glands was previously reported using a cell-free extract from mouse bone marrow. However, to bring this potential therapy a step closer to clinical application, a human bone marrow cell extract (BMCE) needs to be tested. Here, we report that irradiation-induced injury of salivary glands in immunocompetent mice treated with human BMCE secreted 50% more saliva than saline-injected mice, and BMCE did not cause additional acute inflammatory reaction. In addition, to identify the cell fraction in BMCE with the most therapeutic activity, we sorted human bone marrow into 3 cell fractions (mononuclear, granulocyte, and red blood cells) and tested their respective cell extracts. We identified that the mononuclear cell extract (MCE) provided the best therapeutic efficacy. It increased salivary flow 50% to 73% for 16 wk, preserved salivary parenchymal and stromal cells, and doubled cell proliferation rates while producing less inflammatory response. In contrast, the cell extract of granulocytes was of shorter efficacy and induced an acute inflammatory response, while that from red blood cells was not therapeutically effective for salivary function. Several proangiogenic (MMP-8, MMP-9, VEGF, uPA) and antiangiogenic factors (TSP-1, PF4, TIMP-1, PAI-1) were identified in MCE. Added advantages of BMCE and MCE for potential clinical use were that cell extracts from both male and female donors were comparably bioactive and that cell extracts could be stored and transported much more conveniently than cells. These findings suggest human BMCE, specifically the MCE fraction, is a promising therapy against irradiation-induced salivary hypofunction.
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Affiliation(s)
- X. Su
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, Canada
- Sun Yat-sen University, Guanghua School of Stomatology, Department of Operative Dentistry and Endodontics, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
| | - Y. Liu
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, Canada
| | - O. ElKashty
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, Canada
- Department of Oral Pathology, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
| | - J. Seuntjens
- Gerald Bronfman Department of Oncology, Medical Physics Unit, McGill University, Montreal, Canada
| | - K.M. Yamada
- Cell Biology Section, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD, USA
| | - S.D. Tran
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, Canada
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Ayala Alvarez D, Watson P, Popovic M, Heng V, Evans M, Seuntjens J. MO-0298 TG-43 dosimetry characterization of the INTRABEAM system with spherical applicators. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02330-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Aldelaijan S, Khosravi M, Khouj Y, Harris T, O'Farrell D, Seuntjens J, Devic S, Buzurovic I. PO-0229 Towards informed and digitized HDR brachytherapy QA: Quantitative analysis of GYN applicators. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)06388-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Antaki M, Renaud M, Seuntjens J, Enger S. OC-0042 Applying column generation to the intensity-modulated high-dose-rate brachytherapy inverse planning. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)06284-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Heng V, Diamant A, Chatterjee A, Faria S, Bahig H, Filion E, Doucet R, El Naqa I, Seuntjens J. PO-0995: Impact of the dose outside the PTV on distant recurrence in coplanar and non-coplanar lung SBRT. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)01012-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Tomic N, Seuntjens J, Devic S. PO-1308: Relative Dose Measurements in Diagnostic Radiology Beams Using the XR-QA2 GafChromicTM Film Model. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)01326-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Chatterjee A, Woodruff H, Lobbes M, Wijk YV, Beuque M, Seuntjens J, Lambin P. Altering the Decision Threshold as a Simple and Effective Method for Machine Learning-Based Classification of Imbalanced Radiation Oncology Data. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.793] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Moftah B, Aldelaijan S, Shehadeh M, Alzorkany F, Alrumayan F, Alsbeih G, Alshabanah M, Seuntjens J, Tomic N, Devic S. Calibration of MTT assay in proton beams using radiochromic films. Phys Med 2020; 77:146-153. [PMID: 32861190 DOI: 10.1016/j.ejmp.2020.08.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 05/31/2020] [Accepted: 08/04/2020] [Indexed: 10/23/2022] Open
Abstract
PURPOSE This study provides methodology of calibrating as well as controlling the output for an MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) colorimetric assay irradiated in a low energy proton beam using EBT3-model GAFCHROMICTM film, without correcting for quenching effect. METHODS A calibrated Markus ionization chamber was used to measure the depth dose and beam output for 26.5 MeV protons produced by a CS30 cyclotron. A time-controlled aluminum cylinder was added in front of the horizontal beam-exit serving as a radiation shutter. Following the TRS-398 reference dosimetry protocol for proton beams, the output was calibrated in water at a reference depth of 3 mm. EBT3 film was calibrated for doses up to 8 Gy at the same depth. To verify the dose distribution for each 96-well MTT assay plate, EBT3 film was placed at the reference depth during irradiation and cell doses were scaled by measured percent depth dose (PDD) data. RESULTS The radiochromic film dosimetry system in this study provides dose measurements with an uncertainty better than 3.3% for doses higher than 1 Gy. From a single exposure and utilizing the Gaussian shape of the beam, multiple dose points can be obtained within different wells of the same plate ranging from 6.9 Gy (sigma ∼4%) in the central well, and 2 Gy (sigma ∼8%) for wells positioned closer to the periphery. CONCLUSIONS We described a methodology for radiochromic film-based dose monitoring system, using low-energy protons, which can be used for the MTT assay in any proton beam, except within Bragg peak region.
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Affiliation(s)
- B Moftah
- Radiation Physics Section, Biomedical Physics Department, King Faisal Specialist Hospital & Research Centre, Riyadh, Kingdom of Saudi Arabia; Medical Physics Unit, McGill University, Montréal, Québec, Canada
| | - S Aldelaijan
- Radiation Physics Section, Biomedical Physics Department, King Faisal Specialist Hospital & Research Centre, Riyadh, Kingdom of Saudi Arabia
| | - M Shehadeh
- Radiation Physics Section, Biomedical Physics Department, King Faisal Specialist Hospital & Research Centre, Riyadh, Kingdom of Saudi Arabia
| | - F Alzorkany
- Radiation Physics Section, Biomedical Physics Department, King Faisal Specialist Hospital & Research Centre, Riyadh, Kingdom of Saudi Arabia
| | - F Alrumayan
- Cyclotron and Radiopharmaceuticals Department, King Faisal Specialist Hospital & Research Centre, Riyadh, Kingdom of Saudi Arabia
| | - G Alsbeih
- Radiation Biology Section, Biomedical Physics Department, King Faisal Specialist Hospital & Research Centre, Riyadh, Kingdom of Saudi Arabia
| | - M Alshabanah
- Oncology Centre, King Faisal Specialist Hospital & Research Centre, Riyadh, Kingdom of Saudi Arabia
| | - J Seuntjens
- Medical Physics Unit, McGill University, Montréal, Québec, Canada; Department of Oncology, Faculty of Medicine, McGill University, Montréal, Québec, Canada
| | - N Tomic
- Medical Physics Unit, McGill University, Montréal, Québec, Canada; Department of Radiation Oncology, Jewish General Hospital, Montréal, Québec, Canada
| | - S Devic
- Medical Physics Unit, McGill University, Montréal, Québec, Canada; Department of Radiation Oncology, Jewish General Hospital, Montréal, Québec, Canada.
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Andreo P, Burns DT, Kapsch RP, McEwen M, Vatnitsky S, Andersen CE, Ballester F, Borbinha J, Delaunay F, Francescon P, Hanlon MD, Mirzakhanian L, Muir B, Ojala J, Oliver CP, Pimpinella M, Pinto M, de Prez LA, Seuntjens J, Sommier L, Teles P, Tikkanen J, Vijande J, Zink K. Determination of consensus k Q values for megavoltage photon beams for the update of IAEA TRS-398. ACTA ACUST UNITED AC 2020; 65:095011. [DOI: 10.1088/1361-6560/ab807b] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Su X, Liu Y, Bakkar M, ElKashty O, El-Hakim M, Seuntjens J, Tran SD. Labial Stem Cell Extract Mitigates Injury to Irradiated Salivary Glands. J Dent Res 2020; 99:293-301. [PMID: 31937182 DOI: 10.1177/0022034519898138] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Stem cell-based therapies could provide a permanent treatment for salivary gland (SG) hypofunction caused by ionizing radiation (IR) injury. However, current challenges for SG stem cells to reach the clinic include surgical invasiveness, amount of tissue needed, cell delivery, and storage methods. The objective of this study was to develop a clinically less invasive method to isolate and expand human SG stem cells and then to obtain a cell-free extract to be used as a therapy for IR-injured SGs. Human labial glands were biopsied, and labial stem cells (LSCs) were expanded by explant culture. The LSC extract (LSCE) was obtained by releasing the cellular components after 3 freeze-thaw cycles and 17,000g force centrifugation. LSCE was injected intravenously into mice that had their SGs injured with 13-Gy IR. Positive (non-IR) and negative (IR) control mice received injections of saline (vehicle control). Three pieces of labial glands (0.1 g weight) could expand 1 to 2 million cells. LSCs had a doubling time of 18.8 h; could differentiate into osteocytes, adipocytes, and chondrocytes; and were positive for mesenchymal stem cell markers. Both angiogenic (FGF-1, FGF-2, KGF, angiopoietin, uPA, VEGF) and antiangiogenic factors (PAI-1, TIMP-1, TSP-1, CD26) were detected in LSCE. In addition, some angiogenic factors (PEDF, PTX3, VEGF) possessed neurotrophic functions. Mice treated with LSCE had 50% to 60% higher salivary flow rate than saline-treated mice at 8 and 12 wk post-IR. Saliva lag time measurements also confirmed that LSCE restored SG function. Histologic analyses of parotids and submandibular glands reported comparable numbers of acinar cells, blood vessels, and parasympathetic nerves and cell proliferation rates in sham IR and LSCE-treated mice, though significantly lower in saline-treated mice. An explant culture method can harvest a large number of LSCs from small pieces of labial glands. LSCE showed clinical potential to mitigate IR-injured SGs.
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Affiliation(s)
- X Su
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dentistry, McGill University, Montreal, QC, Canada
| | - Y Liu
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dentistry, McGill University, Montreal, QC, Canada
| | - M Bakkar
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dentistry, McGill University, Montreal, QC, Canada
| | - O ElKashty
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dentistry, McGill University, Montreal, QC, Canada
| | - M El-Hakim
- Department of Oral and Maxillofacial Surgery, McGill University, Montreal, QC, Canada
| | - J Seuntjens
- Gerald Bronfman Department of Oncology, Medical Physics Unit, McGill University, Montreal, Canada
| | - S D Tran
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dentistry, McGill University, Montreal, QC, Canada
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Ybarra N, Seuntjens J. OC-0376 Radio-selective effects of natural occurring muscle-derived dipeptide in A549 and normal cell lines. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)30796-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Zlateva Y, Muir B, El Naqa I, Seuntjens J. OC-0293 Cerenkov emission-based dosimetry is a promising perturbation-free technique. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)30713-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Chatterjee A, Vallières M, Dohan A, Levesque I, Ueno Y, Saif S, Reinhold C, Seuntjens J. PO-0949 Improved external validation performance of predictive radiomics models using statistical methods. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)31369-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Su X, Fang D, Liu Y, Ruan G, Seuntjens J, Kinsella JM, Tran SD. Lyophilized bone marrow cell extract functionally restores irradiation-injured salivary glands. Oral Dis 2018; 24:202-206. [PMID: 29480601 DOI: 10.1111/odi.12728] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 08/02/2017] [Indexed: 12/16/2022]
Abstract
OBJECTIVE Bone marrow cell extract (BMCE) was previously reported to restore salivary gland hypofunction caused by irradiation injury. Proteins were shown to be the main active factors in BMCE. However, BMCE therapy requires multiple injections and protein denaturation is a concern during BMCE storage. This study aimed to preserve, by lyophilization (freeze-drying), the bioactive factors in BMCE. METHODS We developed a method to freeze-dry BMCE and then to analyze its ingredients and functions in vivo. Freeze-dried (FD) BMCE, freshly prepared BMCE (positive control), or saline (vehicle control) was injected into the tail vein of mice that had received irradiation to damage their salivary glands. RESULTS Results demonstrated that the presence of angiogenesis-related factors and cytokines in FD-BMCE remained comparable to those found in fresh BMCE. Both fresh and FD-BMCE restored comparably saliva secretion, increased cell proliferation, upregulated regenerative/repair genes, protected salivary acinar cells, parasympathetic nerves, and blood vessels from irradiation-damaged salivary glands. CONCLUSION Lyophilization of BMCE maintained its bioactivity and therapeutic effect on irradiation-injured salivary glands. The advantages of freeze-drying BMCE are its storage and transport at ambient temperature.
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Affiliation(s)
- X Su
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dentistry, McGill University, Montreal, QC, Canada
| | - D Fang
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dentistry, McGill University, Montreal, QC, Canada
| | - Y Liu
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dentistry, McGill University, Montreal, QC, Canada
| | - G Ruan
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dentistry, McGill University, Montreal, QC, Canada.,College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, Guangxi, China
| | - J Seuntjens
- Department of Oncology, Medical Physics Unit, McGill University, Montreal, QC, Canada
| | - J M Kinsella
- Department of Bioengineering, McGill University, Montreal, QC, Canada
| | - S D Tran
- McGill Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dentistry, McGill University, Montreal, QC, Canada
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Papaconstadopoulos P, O'Grady K, Aldelaijan S, Devic S, Levesque I, Seuntjens J. EP-2153: The primary X-ray source: reconstruction and characterization of six Varian TrueBeam sources. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)32462-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Watson P, Bekerat H, Papaconstadopoulos P, Seuntjens J. OC-0406: Validation of the INTRABEAM system dosimetry with ionization chamber and EBT3 film measurements. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)30716-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Diamant A, Chatterjee A, El Naqa I, Bahig H, Filion E, Robinson C, Faria S, Al-Halabi H, Adil K, Seuntjens J. PO-0755: Can dose proximal to the PTV influence the risk of distant metastases in SBRT lung cancer patients? Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)31065-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Toltz A, Seuntjens J, Lu H, Paganetti H. PO-0874: Proton therapy range verification accuracy considering range mixing for time resolved dosimetry. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)31184-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Diamant A, El Naqa I, Faria S, Seuntjens J. Can Dose Metrics Predict Distant Metastases in SBRT Non–small Cell Lung Cancer Patients? Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.1685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Schneider J, Tomic N, Vuong T, Lisbona R, Hickeson M, Chaussé G, DeBlois F, Seuntjens J, Devic S. EP-1701: FDG-PET Background Definition in Rectal Cancer Patients Using Differential Uptake Volume Histograms. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)32233-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Tomic N, Papaconstadopoulos P, Seuntjens J, DeBlois F, Devic S. EP-1717: Image Quality Comparison Between Two Radiotherapy Simulators. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)32249-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Renaud M, Serban M, Lambert C, Seuntjens J. EP-1545: On mixed-modality radiation therapy optimization using the column generation approach. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31980-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Diamant A, Seuntjens J, El Naqa I, Al-Halabi H, Adil K. Prediction of Distant Metastasis Using Dose-Volume Metrics in Non-Small Cell Lung Cancer Stereotactic Body Radiation Therapy. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.2140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Adil K, Boustead A, El Naqa I, Seuntjens J, Duclos M, Kopek N, Faria S, Abdulkarim B, Al-Halabi H. Stereotactic Body Radiation Therapy With 48 Gy in 3 Fractions Is an Effective Treatment for Early-Stage Non-Small Cell Lung Cancer Patients. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.1839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ybarra N, Vallieres M, Jeyaseelan K, Freeman C, Jung S, Turcotte R, Seuntjens J, El Naqa I. Correlation of Molecular Imaging and Biomarkers Expression in the Prediction of Metastatic Capacity of Soft Tissue Sarcomas. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.2396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Renaud J, Rossomme S, Sarfehnia A, Vynckier S, Palmans H, Kacperek A, Seuntjens J. Development and application of a water calorimeter for the absolute dosimetry of short-range particle beams. Phys Med Biol 2016; 61:6602-6619. [DOI: 10.1088/0031-9155/61/18/6602] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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O'Grady K, Davis S, Seuntjens J. TU-AB-BRC-05: Creation of a Monte Carlo TrueBeam Model by Reproducing Varian Phase Space Data. Med Phys 2016. [DOI: 10.1118/1.4957399] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Zlateva Y, Seuntjens J, El Naqa I. SU-C-201-07: Towards Clinical Cherenkov Emission Dosimetry: Stopping Power-To-Cherenkov Power Ratios and Beam Quality Specification of Clinical Electron Beams. Med Phys 2016. [DOI: 10.1118/1.4955547] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Mirzakhanian L, Benmakhlouf H, Seuntjens J. TH-AB-201-09. Med Phys 2016. [DOI: 10.1118/1.4958038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Archambault L, Papaconstadopoulos P, Seuntjens J, Bouchard H. TH-CD-201-04: A Study of Cherenkov Light Generated and Collected in Plastic Scintillation Detector. Med Phys 2016. [DOI: 10.1118/1.4958126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Watson PGF, Renaud MA, Seuntjens J. TU-AB-BRC-07: Efficiency of An IAEA Phase-Space Source for a Low Energy X-Ray Tube Using Egs++. Med Phys 2016. [DOI: 10.1118/1.4957401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Tomic N, Bekerat H, Seuntjens J, Forghani R, DeBlois F, Devic S. SU-F-T-398: Improving Radiotherapy Treatment Planning Using Dual Energy Computed Tomography Based Tissue Characterization. Med Phys 2016. [DOI: 10.1118/1.4956583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Diamant A, El Naqa I, Ybarra N, Seuntjens J. SU-F-R-44: Modeling Lung SBRT Tumor Response Using Bayesian Network Averaging. Med Phys 2016. [DOI: 10.1118/1.4955815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Schneider J, Vuong T, Tomic N, Hickeson M, Lisbona R, DeBlois F, Seuntjens J, Devic S. WE-FG-202-04: Decomposition of FDG-PET Based Differential Uptake Volume Histograms in Rectal Cancer Patients. Med Phys 2016. [DOI: 10.1118/1.4957916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Renaud J, Sarfehnia A, Woodings S, Kok J, van Asselen B, Wolthaus J, Raaymakers B, Seuntjens J. TH-CD-BRA-10: Towards Reference Dosimetry of MR-Linacs Using a Clinical Probe-Format Calorimeter. Med Phys 2016. [DOI: 10.1118/1.4958153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Devic S, Tomic N, Lewis D, Aldelaijan S, DeBlois F, Seuntjens J. SU-G-BRB-14: Uncertainty of Radiochromic Film Based Relative Dose Measurements. Med Phys 2016. [DOI: 10.1118/1.4956921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Devic S, Aldelaijan S, Alzorkany F, Tomic N, Seuntjens J, DeBlois F, Moftah B. EP-1482: Improving accuracy of radiochromic film dosimetry system using control film piece. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)32732-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Tomic N, Bekerat H, DeBlois F, Seuntjens J, Forghani R, Devic S. EP-1827: Dual energy Computed Tomography based tissue characterisation for Radiotherapy treatment planning. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)33078-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Papaconstadopoulos P, Levesque IR, Maglieri R, Seuntjens J. Direct reconstruction of the source intensity distribution of a clinical linear accelerator using a maximum likelihood expectation maximization algorithm. Phys Med Biol 2016; 61:1078-94. [PMID: 26758232 DOI: 10.1088/0031-9155/61/3/1078] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Direct determination of the source intensity distribution of clinical linear accelerators is still a challenging problem for small field beam modeling. Current techniques most often involve special equipment and are difficult to implement in the clinic. In this work we present a maximum-likelihood expectation-maximization (MLEM) approach to the source reconstruction problem utilizing small fields and a simple experimental set-up. The MLEM algorithm iteratively ray-traces photons from the source plane to the exit plane and extracts corrections based on photon fluence profile measurements. The photon fluence profiles were determined by dose profile film measurements in air using a high density thin foil as build-up material and an appropriate point spread function (PSF). The effect of other beam parameters and scatter sources was minimized by using the smallest field size ([Formula: see text] cm(2)). The source occlusion effect was reproduced by estimating the position of the collimating jaws during this process. The method was first benchmarked against simulations for a range of typical accelerator source sizes. The sources were reconstructed with an accuracy better than 0.12 mm in the full width at half maximum (FWHM) to the respective electron sources incident on the target. The estimated jaw positions agreed within 0.2 mm with the expected values. The reconstruction technique was also tested against measurements on a Varian Novalis Tx linear accelerator and compared to a previously commissioned Monte Carlo model. The reconstructed FWHM of the source agreed within 0.03 mm and 0.11 mm to the commissioned electron source in the crossplane and inplane orientations respectively. The impact of the jaw positioning, experimental and PSF uncertainties on the reconstructed source distribution was evaluated with the former presenting the dominant effect.
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Affiliation(s)
- P Papaconstadopoulos
- McGill University, Medical Physics Unit and the Research Institute of the McGill University Health Centre, Montreal, QC H3A 0G4, Canada
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Vallieres M, Freeman C, Ahmed Z, Turcotte R, Hickeson M, Skamene S, Jeyaseelan K, Hathout L, Serban M, Xing S, Powell T, Seuntjens J, Levesque I, El Naqa I. Early Assessment of Tumor Aggressiveness Using Joint FDG-PET/MRI Textural Features: Prediction of Prospective Cohort and Potential Improvement Using Hypoxia and Perfusion Biomarkers. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Serban M, Seuntjens J, Roussin E, Alexander A, Tremblay JR, Wierzbicki W. Patient-specific compensation for Co-60 TBI treatments based on Monte Carlo design: A feasibility study. Phys Med 2015; 32:67-75. [PMID: 26498377 DOI: 10.1016/j.ejmp.2015.09.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 09/19/2015] [Accepted: 09/25/2015] [Indexed: 12/22/2022] Open
Abstract
PURPOSE To develop an AP-PA treatment technique for the delivery of total body irradiation (TBI) at extended SSD using a modified Co-60 unit equipped with flattening filter and patient-specific compensators supported by Monte Carlo (MC) simulations and measurements. METHODS An existing Eldorado-78 Co-60 teletherapy unit was stripped of its original collimator and equipped with two beam-defining cerrobend blocks. An acrylic flattening filter was numerically designed based on detailed mapping of the dose distribution of the large open field at a 10 cm depth in water using a primary radiation attenuation calculation. An EGSnrc/BEAMnrc MC model of the resulting unit was developed and experimentally validated and was used to calculate MC dose distributions in whole-body supine and prone CT images of a patient. AP-PA patient-specific compensators were designed based on the supine and prone mid-plane dose distributions. RESULTS The designed flattening filter flattens the beam to within ±2% over a 200 cm × 70 cm area at 10 cm depth in water. Experimental validation of the calculated dose profiles in the open and flattened beams shows agreement of better than 2% and 1%, respectively. Patient MC dose calculations in the flattened, uncompensated beam showed dose deviations from prescription dose most notably in lung, neck and extremities ranging from -5% to +25%. The use of patient-specific compensators reduced inhomogeneities to within -5% to +10%. CONCLUSIONS This work demonstrates that a Co-60 TBI setup upgraded with patient-specific compensators, numerically designed using MC patient dose calculations, is feasible and considerably improves the dose homogeneity.
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Affiliation(s)
- M Serban
- Hopital Maisonneuve-Rosemont, Montreal, Canada; Department of Medical Physics, McGill University Health Centre, Montreal, Canada.
| | - J Seuntjens
- Department of Medical Physics, McGill University Health Centre, Montreal, Canada
| | - E Roussin
- Hopital Maisonneuve-Rosemont, Montreal, Canada
| | - A Alexander
- Department of Medical Physics, McGill University Health Centre, Montreal, Canada; Department of Medical Physics, Saskatchewan Cancer Agency, Saskatoon, Canada
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Seuntjens J, Beaulieu L, Collins L, Despres P, Devic S, El Naqa I, Nadeau J, Pike B, Reader A. MO-DE-BRA-04: The CREATE Medical Physics Research Training Network: Training of New Generation Innovators. Med Phys 2015. [DOI: 10.1118/1.4925339] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Liang L, Bekerat H, Tomic N, DeBlois F, Devic S, Morcos M, Popovic M, Watson P, Seuntjens J. SU-E-T-462: Impact of the Radiochromic Film Energy Response On Dose Measurements of Low Energy Electronic Brachytherapy Sources. Med Phys 2015. [DOI: 10.1118/1.4924824] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Pater P, Backstrom G, Enger S, Villegas F, Ahnesjo A, Seuntjens J, Naqa IE. SU-E-T-581: On the Value of LET as a Radiation Quality Descriptor for RBE. Med Phys 2015. [DOI: 10.1118/1.4924943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Renaud J, Sarfehnia A, Seuntjens J. WE-AB-BRB-01: Development of a Probe-Format Graphite Calorimeter for Practical Clinical Dosimetry: Numerical Design Optimization, Prototyping, and Experimental Proof-Of-Concept. Med Phys 2015. [DOI: 10.1118/1.4925842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Pater P, Backstrom G, Enger S, Villegas F, Ahnesjo A, Seuntjens J, El Naqa I. SU-E-T-494: Influence of Proton Track-Cell Nucleus Incidence Angle On Relative Biological Effectiveness. Med Phys 2015. [DOI: 10.1118/1.4924856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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