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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Aldelaijan S, Bekerat H, Buzurovic I, Devlin P, Deblois F, Seuntjens J, Collins L, Devic S. Improving Dose Accuracy of HDR Brachytherapy Treatment of Skin Lesions Using Freiburg Flap Applicator Based on Reference Radiochromic Film Dose Measurements. Brachytherapy 2017. [DOI: 10.1016/j.brachy.2017.04.191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Devic S, Mwidu U, Alkafi A, Moftah B, Shakir S, Hijazi H, Yeung C, Vuong T. EP-1798: Highly conformal external beam modalities vs. brachytherapy boost for rectal cancer patients. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)32160-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Vuong T, Garant A, Devic S, Kezouth A. PO-0703: Bowel dysfunction resulting from different treatment strategies in patients with rectal cancer. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31140-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Devic S, Schneider J, Vuong T, Tomic N, Lisbona R, Hickeson M, Chaussé G, DeBlois F, Seuntjens J, Batist G. Differential Uptake Volume Histograms as a Predictor of Response in Rectal Adenocarcinoma Patients Treated with Preoperative Endorectal Brachytherapy. Brachytherapy 2017. [DOI: 10.1016/j.brachy.2017.04.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Rabaeh KA, Basfar AA, Almousa AA, Devic S, Moftah B. New normoxic N-(Hydroxymethyl)acrylamide based polymer gel for 3D dosimetry in radiation therapy. Phys Med 2017; 33:121-126. [PMID: 28094138 DOI: 10.1016/j.ejmp.2016.12.019] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2016] [Revised: 12/05/2016] [Accepted: 12/28/2016] [Indexed: 11/15/2022] Open
Abstract
A novel composition of normoxic polymer gel dosimeters based on radiation-induced polymerization of N-(Hydroxymethyl)acrylamide (NHMA) is introduced in this study for 3D dosimetry for Quality Assurance (QA) in radiation therapy. Dosimeters were irradiated by 6, 10 and 18MV photon beams of a medical linear accelerator at various dose rates to doses of up to 20Gy. The dose response of polymer gel dosimeters was studied using nuclear magnetic resonance (NMR) spin-spin relaxation rate (R2) of hydrogen protons within the water molecule. Also, we measured gel response using absorption spectroscopy and found that this novel gel can be successfully utilized for both MRI- and OCT- (Optical Computed Tomography) based 3D dosimetry. We investigated dosimetric properties of six different compositions of the new NHMA-based gel in terms of dose rate, radiation beam quality and stability of dose-dependent polymerization after irradiation. We found no significant effects of these parameters on the novel gel dosimeter performance in both relaxation rate and absorbance measurements.
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Mwidu U, Devic S, Shehadeh M, AlKafi M, Mahmood R, Moftah B. SU-F-T-420: Dosimetry Comparison of Advanced External Beam Radiation Treatment Modalities to Brachytherapy Treatments in Patients with Cervical Cancer. Med Phys 2016. [DOI: 10.1118/1.4956605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [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] [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] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Nout RA, Bekerat H, Devic S, Vuong T. Is Daily CT-Based Adaptive Endorectal Brachytherapy of Benefit Compared to Using a Single Treatment Plan for Preoperative Treatment of Locally Advanced Rectal Cancer? Brachytherapy 2016. [DOI: 10.1016/j.brachy.2016.04.133] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Devic S. Warburg Effect - a Consequence or the Cause of Carcinogenesis? J Cancer 2016; 7:817-22. [PMID: 27162540 PMCID: PMC4860798 DOI: 10.7150/jca.14274] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Accepted: 03/13/2016] [Indexed: 02/07/2023] Open
Abstract
Ever since its discovery (1924) the Warburg effect (aerobic glycolysis) remains an unresolved puzzle: why the aggressive cancer cells "prefer" to use the energetically highly inefficient method of burning the glucose at the cellular level? While in the course of the last 90 years several hypotheses have been suggested, to this date there is no clear explanation of this rather unusual effect. Even though it is commonly assumed that Warburg effect is a consequence of carcinogenesis, yet another hypothesis could be brought up that the cellular switch to aerobic glycolysis may represent the very point in time when a normal cell becomes cancerous. Furthermore, this switch may happen at the point where the fate of pyruvic acid is determined, caused by the inadequate supply of enzymes that promote citric as opposed to lactic acid cycle. Currently, few clinical observations, like low cancer incidence in Type 1 diabetes mellitus and increased cancer incidence in people on high carbohydrate diets might be called upon to support such hypothesis.
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Devic S, Tomic N, Lewis D. Reference radiochromic film dosimetry: Review of technical aspects. Phys Med 2016; 32:541-56. [DOI: 10.1016/j.ejmp.2016.02.008] [Citation(s) in RCA: 168] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2015] [Revised: 01/30/2016] [Accepted: 02/23/2016] [Indexed: 11/29/2022] 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] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Devic S, Mohammed H, Tomic N, Aldelaijan S, De Blois F, Seuntjens J, Lehnert S, Faria S. FDG-PET-based differential uptake volume histograms: a possible approach towards definition of biological target volumes. Br J Radiol 2016; 89:20150388. [PMID: 27007269 DOI: 10.1259/bjr.20150388] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
OBJECTIVE Integration of fluorine-18 fludeoxyglucose ((18)F-FDG)-positron emission tomography (PET) functional data into conventional anatomically based gross tumour volume delineation may lead to optimization of dose to biological target volumes (BTV) in radiotherapy. We describe a method for defining tumour subvolumes using (18)F-FDG-PET data, based on the decomposition of differential uptake volume histograms (dUVHs). METHODS For 27 patients with histopathologically proven non-small-cell lung carcinoma (NSCLC), background uptake values were sampled within the healthy lung contralateral to a tumour in those image slices containing tumour and then scaled by the ratio of mass densities between the healthy lung and tumour. Signal-to-background (S/B) uptake values within volumes of interest encompassing the tumour were used to reconstruct the dUVHs. These were subsequently decomposed into the minimum number of analytical functions (in the form of differential uptake values as a function of S/B) that yielded acceptable net fits, as assessed by χ(2) values. RESULTS Six subvolumes consistently emerged from the fitted dUVHs over the sampled volume of interest on PET images. Based on the assumption that each function used to decompose the dUVH may correspond to a single subvolume, the intersection between the two adjacent functions could be interpreted as a threshold value that differentiates them. Assuming that the first two subvolumes spread over the tumour boundary, we concentrated on four subvolumes with the highest uptake values, and their S/B thresholds [mean ± standard deviation (SD)] were 2.88 ± 0.98, 4.05 ± 1.55, 5.48 ± 2.06 and 7.34 ± 2.89 for adenocarcinoma, 3.01 ± 0.71, 4.40 ± 0.91, 5.99 ± 1.31 and 8.17 ± 2.42 for large-cell carcinoma and 4.54 ± 2.11, 6.46 ± 2.43, 8.87 ± 5.37 and 12.11 ± 7.28 for squamous cell carcinoma, respectively. CONCLUSION (18)F-FDG-based PET data may potentially be used to identify BTV within the tumour in patients with NSCLC. Using the one-way analysis of variance statistical tests, we found a significant difference among all threshold levels among adenocarcinomas, large-cell carcinoma and squamous cell carcinomas. On the other hand, the observed significant variability in threshold values throughout the patient cohort (expressed as large SDs) can be explained as a consequence of differences in the physiological status of the tumour volume for each patient at the time of the PET/CT scan. This further suggests that patient-specific threshold values for the definition of BTVs could be determined by creation and curve fitting of dUVHs on a patient-by-patient basis. ADVANCES IN KNOWLEDGE The method of (18)F-FDG-PET-based dUVH decomposition described in this work may lead to BTV segmentation in tumours.
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Papaconstadopoulos P, Seuntjens J, Devic S. Response to “Comment on ‘A protocol for EBT3 radiochromic film dosimetry using reflection scanning’ ” [Med. Phys. 41(12), 122101 (6pp.) (2014)]. Med Phys 2016; 43:1580-2. [DOI: 10.1118/1.4941006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Di Lillo F, Mettivier G, Sarno A, Tromba G, Tomic N, Devic S, Russo P. Energy dependent calibration of XR-QA2 radiochromic film with monochromatic and polychromatic x-ray beams. Med Phys 2016; 43:583. [DOI: 10.1118/1.4939063] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Aldelaijan S, Alzorkany F, Moftah B, Buzurovic I, Seuntjens J, Tomic N, Devic S. Use of a control film piece in radiochromic film dosimetry. Phys Med 2016; 32:202-7. [DOI: 10.1016/j.ejmp.2015.12.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2015] [Revised: 11/25/2015] [Accepted: 12/11/2015] [Indexed: 10/22/2022] Open
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Vuong T, Nout R, Niazi T, Garant A, Bujold A, Martin A, Ferland S, Stroian G, Thebaut J, Sym A, Devic S. Radiation Therapy as a Curative Modality for Patients With Rectal Cancer. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Lewis D, Devic S. Correcting scan-to-scan response variability for a radiochromic film-based reference dosimetry system. Med Phys 2015; 42:5692-701. [DOI: 10.1118/1.4929563] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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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] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Aldelaijan S, Alzorkany F, Moftah B, Alrumayan F, Seuntjens J, Lewis D, Devic S. SU-E-T-665: Radiochromic Film Quenching Effect Reduction for Proton Beam Dosimetry. Med Phys 2015. [DOI: 10.1118/1.4925028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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