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Zhao Y, Haworth A, Rowshanfarzad P, Ebert MA. Focal Boost in Prostate Cancer Radiotherapy: A Review of Planning Studies and Clinical Trials. Cancers (Basel) 2023; 15:4888. [PMID: 37835581 PMCID: PMC10572027 DOI: 10.3390/cancers15194888] [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: 08/17/2023] [Revised: 09/28/2023] [Accepted: 10/05/2023] [Indexed: 10/15/2023] Open
Abstract
BACKGROUND Focal boost radiotherapy was developed to deliver elevated doses to functional sub-volumes within a target. Such a technique was hypothesized to improve treatment outcomes without increasing toxicity in prostate cancer treatment. PURPOSE To summarize and evaluate the efficacy and variability of focal boost radiotherapy by reviewing focal boost planning studies and clinical trials that have been published in the last ten years. METHODS Published reports of focal boost radiotherapy, that specifically incorporate dose escalation to intra-prostatic lesions (IPLs), were reviewed and summarized. Correlations between acute/late ≥G2 genitourinary (GU) or gastrointestinal (GI) toxicity and clinical factors were determined by a meta-analysis. RESULTS By reviewing and summarizing 34 planning studies and 35 trials, a significant dose escalation to the GTV and thus higher tumor control of focal boost radiotherapy were reported consistently by all reviewed studies. Reviewed trials reported a not significant difference in toxicity between focal boost and conventional radiotherapy. Acute ≥G2 GU and late ≥G2 GI toxicities were reported the most and least prevalent, respectively, and a negative correlation was found between the rate of toxicity and proportion of low-risk or intermediate-risk patients in the cohort. CONCLUSION Focal boost prostate cancer radiotherapy has the potential to be a new standard of care.
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Affiliation(s)
- Yutong Zhao
- School of Physics, Mathematics and Computing, The University of Western Australia, Crawley, WA 6009, Australia; (P.R.); (M.A.E.)
| | - Annette Haworth
- Institute of Medical Physics, School of Physics, The University of Sydney, Camperdown, NSW 2050, Australia;
| | - Pejman Rowshanfarzad
- School of Physics, Mathematics and Computing, The University of Western Australia, Crawley, WA 6009, Australia; (P.R.); (M.A.E.)
- Centre for Advanced Technologies in Cancer Research (CATCR), Perth, WA 6000, Australia
| | - Martin A. Ebert
- School of Physics, Mathematics and Computing, The University of Western Australia, Crawley, WA 6009, Australia; (P.R.); (M.A.E.)
- Department of Radiation Oncology, Sir Charles Gairdner Hospital, Nedlands, WA 6009, Australia
- 5D Clinics, Claremont, WA 6010, Australia
- School of Medicine and Population Health, University of Wisconsin, Madison WI 53706, USA
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Huang YY, Yang J, Liu YB. Planning issues on linac-based stereotactic radiotherapy. World J Clin Cases 2022; 10:12822-12836. [PMID: 36568990 PMCID: PMC9782937 DOI: 10.12998/wjcc.v10.i35.12822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 10/20/2022] [Accepted: 11/14/2022] [Indexed: 12/14/2022] Open
Abstract
This work aims to summarize and evaluate the current planning progress based on the linear accelerator in stereotactic radiotherapy (SRT). The specific techniques include 3-dimensional conformal radiotherapy, dynamic conformal arc therapy, intensity-modulated radiotherapy, and volumetric-modulated arc therapy (VMAT). They are all designed to deliver higher doses to the target volume while reducing damage to normal tissues; among them, VMAT shows better prospects for application. This paper reviews and summarizes several issues on the planning of SRT to provide a reference for clinical application.
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Affiliation(s)
- Yang-Yang Huang
- School of Nuclear Science and Engineering, East China University of Technology, Nanchang 330013, Jiangxi Province, China
- Department of Radiotherapy, The Second Affiliated Hospital of Zhengzhou University, Zhengzhou 450014, Henan Province, China
| | - Jun Yang
- Department of Radiotherapy, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, China
| | - Yi-Bao Liu
- School of Nuclear Science and Engineering, East China University of Technology, Nanchang 330013, Jiangxi Province, China
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An institutional review: dosimetry comparison between simultaneous integrated boost IMRT and VMAT for prostate cancer. JOURNAL OF RADIOTHERAPY IN PRACTICE 2021. [DOI: 10.1017/s1460396920000370] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
AbstractPurpose:A comparative study was performed about the plan parameters and quality indices between volumetric arc therapy (VMAT) and intensity-modulated radiotherapy (IMRT) for the treatment of high-risk prostate cancer patients. The aim of this retrospective study was to compare the two methods of external beam radiotherapy IMRT and VMAT in terms of plan quality and efficacy.Material and method:Fifteen high-risk prostate patients were planned for radiotherapy using 6 MV photon. Three dose levels were contoured having Planning Tumour Volume 1 (PTV1 = 48 Gy), Planning Tumour Volume 2 (PTV2 = 57.6 Gy) and Planning Tumour Volume 3 (PTV3 = 60 Gy). Setup margins were given using the CHIP trial method. The prescribed PTV3 dose was 60 Gy in 20 fractions which is biologically equivalent to 74 Gy in 37 fractions using α/β = 3. In case of IMRT, seven fixed beam angles 30, 60, 105, 180, 255, 300 and 330 were used and the dose was optimised using the sliding window method. In case of rapid arc technique, one or two full arcs were used for dose optimisation while keeping all the dose constraints and other planning parameters same used in IMRT. The plan evaluation parameters and Organ at risks (OARs) doses were calculated using a dose volume histogram (DVH).Results:The average D2, D5, D95 and PTVmean for PTV3 were 61.22, 61.13, 58.12, 60.00 Gy and 62.41 62.24 59.53 61.12 Gy for IMRT and VMAT, respectively. The averages V60 for bladder and V30 for rectum were 22.81, 25 and 67, 65% for IMRT and VMAT, respectively. The average homogeneity index (HI), conformity index (CI) and gradient index (GI) were 1.04, 1.4833, 14.79 and 1.04, 1.704, 7.89 for IMRT and VMAT, respectively.Conclusion:VMAT takes less dose-delivery time and lesser number of monitoring units than IMRT, thus it compensates the intrafractional movements during dose delivery. The Dose GI in VMAT was much better than IMRT. This indicates sharper dose fall off near the normal tissue. No other major differences were observed in terms of plan evaluation parameters between IMRT and VMAT techniques. So, we conclude that VMAT technique is more efficient than IMRT in terms of plan quality and dose delivery.
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Hirashima H, Nakamura M, Mukumoto N, Ashida R, Fujii K, Nakamura K, Nakajima A, Sakanaka K, Yoshimura M, Mizowaki T. Reducing variability among treatment machines using knowledge-based planning for head and neck, pancreatic, and rectal cancer. J Appl Clin Med Phys 2021; 22:245-254. [PMID: 34151503 PMCID: PMC8292706 DOI: 10.1002/acm2.13316] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 05/14/2021] [Accepted: 05/17/2021] [Indexed: 11/18/2022] Open
Abstract
Purpose This study aimed to assess dosimetric indices of RapidPlan model‐based plans for different energies (6, 8, 10, and 15 MV; 6‐ and 10‐MV flattening filter‐free), multileaf collimator (MLC) types (Millennium 120, High Definition 120, dual‐layer MLC), and disease sites (head and neck, pancreatic, and rectal cancer) and compare these parameters with those of clinical plans. Methods RapidPlan models in the Eclipse version 15.6 were used with the data of 28, 42, and 20 patients with head and neck, pancreatic, and rectal cancer, respectively. RapidPlan models of head and neck, pancreatic, and rectal cancer were created for TrueBeam STx (High Definition 120) with 6 MV, TrueBeam STx with 10‐MV flattening filter‐free, and Clinac iX (Millennium 120) with 15 MV, respectively. The models were used to create volumetric‐modulated arc therapy plans for a 10‐patient test dataset using all energy and MLC types at all disease sites. The Holm test was used to compare multiple dosimetric indices in different treatment machines and energy types. Results The dosimetric indices for planning target volume and organs at risk in RapidPlan model‐based plans were comparable to those in the clinical plan. Furthermore, no dose difference was observed among the RapidPlan models. The variability among RapidPlan models was consistent regardless of the treatment machines, MLC types, and energy. Conclusions Dosimetric indices of RapidPlan model‐based plans appear to be comparable to the ones based on clinical plans regardless of energies, MLC types, and disease sites. The results suggest that the RapidPlan model can generate treatment plans independent of the type of treatment machine.
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Affiliation(s)
- Hideaki Hirashima
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Mitsuhiro Nakamura
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,Division of Medical Physics, Department of Information Technology and Medical Engineering, Faculty of Human Health Science, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Nobutaka Mukumoto
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Ryo Ashida
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Kota Fujii
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Kiyonao Nakamura
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Aya Nakajima
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Katsuyuki Sakanaka
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Michio Yoshimura
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Takashi Mizowaki
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Huang SF, Lin JC, Shiau AC, Chen YC, Li MH, Tsai JT, Liu WH. Optimal tumor coverage with different beam energies by IMRT, VMAT and TOMO: Effects on patients with proximal gastric cancer. Medicine (Baltimore) 2020; 99:e23328. [PMID: 33217871 PMCID: PMC7676572 DOI: 10.1097/md.0000000000023328] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
To compare the effects of different photon energies on radiation planning by intensity-modulated radiotherapy (IMRT), volumetric-modulated arc therapy (VMAT) and helical tomotherapy (TOMO) for proximal gastric cancer (PGC). Network analysis with microarray procession and gene ontology were used to identify the effect of radiotherapy (RT) on PGC. Then, we retrospectively analyzed 8 PGC patients after receiving irradiation with a prescribed dose of 50.4 Gy. The Pinnacle treatment planning system (TPS, V9.8) was used to generate IMRT and VMAT plans by using 6 or 10 MV. TOMO plans were calculated on the Tomotherapy Planning Station Hi-Art Version 4.2.3 workstation (Tomotherapy Incorporated, Madison, WI, USA). PGC is associated with high DNA repair ability. TOMO plan results in higher tumor coverage and a better conformity index than IMRT and VMAT. 10-MV VMAT yields better dosimetric quality of the gradient index than 6-MV VMAT (P = .012). TOMO was associated with a lower irradiation dose in the mean dose to the right kidney (P = .049), left kidney and heart than 6-MV IMRT and 6-MV VMAT. 6-MV IMRT plan presented a higher dose of lung Dmean (P = .017) than 10-MV IMRT. Additionally, VMAT, using a planning energy of 6 MV, was associated with a significantly higher left kidney Dmean (P = .018) and V10 (P = .036) than a planning energy of 10 MV. TOMO is a better RT plan not only for tumor coverage but also for sparing organs at risk. IMRT and VMAT plans with 10 MV beams are more suitable than 6 MV beams for PGC treatment.
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Affiliation(s)
| | - Jang-Chun Lin
- Department of Radiation Oncology, Shuang Ho Hospital
- Department of Radiology, School of Medicine, College of Medicine, Taipei Medical University
| | - An-Cheng Shiau
- Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei
- Department of Radiation Oncology, China Medical University Hospital
- Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung
| | - Yun-Chih Chen
- Department of Radiation Oncology, Shuang Ho Hospital
| | - Ming-Hsien Li
- Department of Radiation Oncology, Shuang Ho Hospital
| | - Jo-Ting Tsai
- Department of Radiation Oncology, Shuang Ho Hospital
- Department of Radiology, School of Medicine, College of Medicine, Taipei Medical University
| | - Wei-Hsiu Liu
- Department of Neurological Surgery, Tri-Service General Hospital and National Defense Medical Center, No. 325, Sec. 2, Cheng-Kung Road
- Department of Surgery, School of Medicine, National Defense Medical Center, Taipei, Taiwan, ROC
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Studenski MT, Delgadillo R, Xu Y, Both J, Padgett K, Abramowitz M, Ford JC, Dal Pra A, Pollack A, Dogan N. Margin verification for hypofractionated prostate radiotherapy using a novel dose accumulation workflow and iterative CBCT. Phys Med 2020; 77:154-159. [PMID: 32862068 DOI: 10.1016/j.ejmp.2020.08.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 07/20/2020] [Accepted: 08/07/2020] [Indexed: 10/23/2022] Open
Abstract
PURPOSE Hypofractionated radiotherapy for prostate cancer reduces the inconvenience of an extended treatment course but the appropriate treatment margin to ensure tumor control while minimizing toxicity is not standardized. Using a novel dose accumulation workflow with iterative CBCT (iCBCT) images, we were able to validate treatment margins. METHODS Sixteen patients treated to the prostate on a hypofractionated clinical trial were selected. Prescription dose was 3625 cGy to > 95% of the PTV in 5 fractions with a boost to 4000 cGy to the high risk GTV (if applicable). PTV margin expansion was 5 mm isotropic except 3 mm posterior, no margin for the GTV. Daily iCBCT images were obtained while practicing strict bladder and rectal filling protocols. Using a novel adaptive dose accumulation workflow, synthetic CTs were created and the daily delivered dose was recalculated. The daily dose distributions were accumulated and target coverage and organ dose were assessed. RESULTS Although the PTV coverage dropped for the accumulated dose, the prostate coverage was not compromised. The differences in bladder and anorectum dose were not significantly different. Four patients received a boost to the GTV and a significant decrease in coverage was noted in the accumulated dose. CONCLUSIONS The novel dose accumulation workflow demonstrated that daily iCBCT images can be used for dose accumulation. We found that our clinical treatment margins resulted in adequate dose to the prostate while sparing OARs. If the goal is to deliver the full dose to an intra-prostatic GTV, a margin may be appropriate.
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Affiliation(s)
- Matthew T Studenski
- Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, 1475 NW 12th Ave., Miami, FL 33136, United States.
| | - Rodrigo Delgadillo
- Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, 1475 NW 12th Ave., Miami, FL 33136, United States
| | - Yihang Xu
- Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, 1475 NW 12th Ave., Miami, FL 33136, United States
| | - Joseph Both
- Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, 1475 NW 12th Ave., Miami, FL 33136, United States
| | - Kyle Padgett
- Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, 1475 NW 12th Ave., Miami, FL 33136, United States
| | - Matthew Abramowitz
- Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, 1475 NW 12th Ave., Miami, FL 33136, United States
| | - John C Ford
- Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, 1475 NW 12th Ave., Miami, FL 33136, United States
| | - Alan Dal Pra
- Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, 1475 NW 12th Ave., Miami, FL 33136, United States
| | - Alan Pollack
- Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, 1475 NW 12th Ave., Miami, FL 33136, United States
| | - Nesrin Dogan
- Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, 1475 NW 12th Ave., Miami, FL 33136, United States
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The air gap between bolus and skin affects dose distribution in helical and direct tomotherapy. JOURNAL OF RADIOTHERAPY IN PRACTICE 2020. [DOI: 10.1017/s1460396920000333] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
AbstractAim:To modify the final dose delivered to superficial tissues and to modulate dose distribution near irradiated surface, different boluses are used. Air gaps often form under the bolus affecting dose distribution. This study aimed to evaluate the effect of an air gap under the bolus radiation on dose delivery.Materials and methods:To evaluate the impact of the air gap, both helical tomotherapy (HT) and direct tomotherapy (DT) were performed in a simulation study.Results:The maximum dose to bolus in DT plans was bigger than that used in HT plans. The maximum dose delivered to the bolus depended on the air gap size. However, the maximum dose to bolus in all HT plans was within the acceptable value range. Acceptable value was set to up to 107% of the prescription dose. In the simulation performed in this study, the acceptable air gap under bolus was up to 15 mm and below 5 mm in HT and DT plans, respectively.Conclusions:HT technique is a good choice, but DT technique can be also used if the bolus position can be reproduced accurately. Thus, the reproducibility of the bolus position between planning and treatment is very important.
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Ray X, Kaderka R, Hild S, Cornell M, Moore KL. Framework for Evaluation of Automated Knowledge-Based Planning Systems Using Multiple Publicly Available Prostate Routines. Pract Radiat Oncol 2020; 10:112-124. [DOI: 10.1016/j.prro.2019.11.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 09/18/2019] [Accepted: 11/13/2019] [Indexed: 11/25/2022]
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Wolf J, Nicholls J, Hunter P, Nguyen DT, Keall P, Martin J. Dosimetric impact of intrafraction rotations in stereotactic prostate radiotherapy: A subset analysis of the TROG 15.01 SPARK trial. Radiother Oncol 2019; 136:143-147. [DOI: 10.1016/j.radonc.2019.04.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 03/26/2019] [Accepted: 04/07/2019] [Indexed: 12/26/2022]
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Ciabatti S, Ntreta M, Buwenge M, Gaudiano C, Sessagesimi E, Romani F, Angelini AL, Cammelli S, Macchia G, Deodato F, Zamagni A, Golfieri R, Morganti AG, Cilla S. Dominant intraprostatic lesion boosting in sexual-sparing radiotherapy of prostate cancer: A planning feasibility study. Med Dosim 2019; 44:356-364. [PMID: 30955990 DOI: 10.1016/j.meddos.2019.01.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Revised: 12/30/2018] [Accepted: 01/22/2019] [Indexed: 02/07/2023]
Abstract
AIM Radical radiotherapy of prostate cancer requires a relatively high dose to achieve an optimal tumor control probability and a reduced dose to the critical structures related to the sexual function (S_OARs) in order to avoid erectile dysfunction. The aim of this study was to perform a planning feasibility analysis of a 3-level dose prescription with Simultaneous Integrated Boost (SIB) on the dominant intraprostatic lesion (DIL) and with S_OARs sparing. MATERIAL AND METHODS Twelve patients with clinically localized intermediate risk prostate cancer were included. The prostate, seminal vescicles, and DIL Clinical Target Volumes were delineated on rigid fused MRI-CT simulation images using mp-MRI as a separate guide. A 5 mm margin was added to define the PTVs. Penile bulb (PB), corpora cavernosa (CC), internal pudendal arteries (IPAs) and neurovascular bundles were contoured as S_OARs. The following doses were prescribed in 25 fractions: 56.25 Gy to PTVsv, 67.50 Gy to PTVp, and 75 Gy to PTVdil. Standard plans (SD-VMAT) were created to fulfil targets coverage and Quantec constraints for conventional OARs (SD_OARs: rectum, bladder, and femoral heads). For each patient, a new "sexual-sparing" plan (SS-VMAT) was created adding new objectives for S_OARs with priority to minimize mean doses to IPAs, CC, and PB. Dose-volume histogram end points were compared between the 2 plans using Wilcoxon test. RESULTS D98% were >95% of prescribed doses for all targets and techniques. No significant differences were found in sparing SD_OARs for considered metrics. Regarding S_OARs, SS_VMAT plans provided a significant reduction of the dose. Mean dose reduction for IPAs, CC, PB, and neurovascular bundles was 32.4% (11.2 Gy, p = 0.002), 22.5% (4.1 Gy, p = 0.006), 10.0% (4.6 Gy, p = 0.010), and 2.6% (1.8 Gy, p = 0.020), respectively. CONCLUSIONS We showed that a significant dose sparing for S_OARs using VMAT-SIB strategy is feasible allowing "sexual-sparing" and highly conformal plans with dose escalation to the DIL.
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Affiliation(s)
- Selena Ciabatti
- Radiation Oncology Unit, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - Maria Ntreta
- Radiation Oncology Unit, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - Milly Buwenge
- Radiation Oncology Unit, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy.
| | - Caterina Gaudiano
- Radiology Unit, Department of Diagnostic Medicine and Prevention, S. Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy
| | - Elisa Sessagesimi
- Radiology Unit, Department of Diagnostic Medicine and Prevention, S. Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy
| | - Fabrizio Romani
- Radiation Oncology Unit, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - Anna L Angelini
- Radiation Oncology Unit, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - Silvia Cammelli
- Radiation Oncology Unit, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - Gabriella Macchia
- Radiotherapy Unit, "Giovanni Paolo II" Foundation, Catholic University of Sacred Heart, Campobasso, Italy
| | - Francesco Deodato
- Radiotherapy Unit, "Giovanni Paolo II" Foundation, Catholic University of Sacred Heart, Campobasso, Italy
| | - Alice Zamagni
- Radiation Oncology Unit, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - Rita Golfieri
- Radiology Unit, Department of Diagnostic Medicine and Prevention, S. Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy
| | - Alessio G Morganti
- Radiation Oncology Unit, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - Savino Cilla
- Medical Physics Unit, "Giovanni Paolo II" Foundation, Catholic University of Sacred Heart, Campobasso, Italy
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Huang Y, Li S, Yue H, Wang M, Hu Q, Wang H, Li T, Li C, Wu H, Zhang Y. Impact of nominal photon energies on normal tissue sparing in knowledge-based radiotherapy treatment planning for rectal cancer patients. PLoS One 2019; 14:e0213271. [PMID: 30845263 PMCID: PMC6405245 DOI: 10.1371/journal.pone.0213271] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Accepted: 02/18/2019] [Indexed: 12/03/2022] Open
Abstract
The interactive adjustment of the optimization objectives during the treatment planning process has made it difficult to evaluate the impact of beam quality exclusively in radiotherapy. Without consensus in the published results, the arbitrary selection of photon energies increased the probability of suboptimal plans. This work aims to evaluate the dosimetric impact of various photon energies on the sparing of normal tissues by applying a preconfigured knowledge-based planning (RapidPlan) model to various clinically available photon energies for rectal cancer patients, based on model-generated optimization objectives, which provide a comparison basis with less human interference. A RapidPlan model based on 81 historical VMAT plans for pre-surgical rectal cancer patients using 10MV flattened beam (10X) was used to generate patient-specific objectives for the automated optimization of other 20 patients using 6X, 8X, 10X (reference), 6MV flattening-filter-free (6F) and 10F beams respectively on a TrueBeam accelerator. It was observed that flattened beams produced very comparable target dose coverage yet the conformity index using 6F and 10F were clinically unacceptable (>1.29). Therefore, dose to organs-at-risk (OARs) and normal tissues were only evaluated for flattened beams. RapidPlan-generated objectives for 6X and 8X beams can achieve comparable target dose coverage as that of 10X, yet the dose to normal tissues increased monotonically with decreased energies. Differences were statistically significant except femoral heads. From the radiological perspective of view, higher beam energy is still preferable for deep seated tumors, even if multiple field entries such as VMAT technique can accumulate enough dose to the target using lower energies, as reported in the literature. In conclusion, RapidPlan model configured for flattened beams cannot optimize un-flattened beams before adjusting the target objectives, yet works for flattened beams of other energies. For the investigated 10X, 8X and 6X photons, higher energies provide better normal tissue sparing.
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Affiliation(s)
- Yuliang Huang
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiation Oncology, Peking University Cancer Hospital & Institute, Beijing Cancer Hospital & Institute, Beijing, China
| | - Sha Li
- Department of Medical Physics, Institute of Medical Humanities, Peking University, Beijing, China
| | - Haizhen Yue
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiation Oncology, Peking University Cancer Hospital & Institute, Beijing Cancer Hospital & Institute, Beijing, China
| | - Meijiao Wang
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiation Oncology, Peking University Cancer Hospital & Institute, Beijing Cancer Hospital & Institute, Beijing, China
| | - Qiaoqiao Hu
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiation Oncology, Peking University Cancer Hospital & Institute, Beijing Cancer Hospital & Institute, Beijing, China
| | - Haiyang Wang
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiation Oncology, Peking University Cancer Hospital & Institute, Beijing Cancer Hospital & Institute, Beijing, China
| | - Tian Li
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiation Oncology, Peking University Cancer Hospital & Institute, Beijing Cancer Hospital & Institute, Beijing, China
| | - Chenguang Li
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiation Oncology, Peking University Cancer Hospital & Institute, Beijing Cancer Hospital & Institute, Beijing, China
| | - Hao Wu
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiation Oncology, Peking University Cancer Hospital & Institute, Beijing Cancer Hospital & Institute, Beijing, China
- * E-mail: (HW); (YZ)
| | - Yibao Zhang
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiation Oncology, Peking University Cancer Hospital & Institute, Beijing Cancer Hospital & Institute, Beijing, China
- * E-mail: (HW); (YZ)
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Nguyen TTT, Arimura H, Asamura R, Hirose TA, Ohga S, Fukunaga JI. Comparison of volumetric-modulated arc therapy and intensity-modulated radiation therapy prostate cancer plans accounting for cold spots. Radiol Phys Technol 2019; 12:137-148. [PMID: 30805779 DOI: 10.1007/s12194-019-00502-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2018] [Revised: 02/07/2019] [Accepted: 02/11/2019] [Indexed: 11/25/2022]
Abstract
This study compared dosimetric indices of volumetric-modulated arc therapy (VMAT) with intensity-modulated radiation therapy (IMRT) accounting for cold spots in prostate cancer plans. IMRT plans were retrospectively generated from 30 prostate cancer patients with ten cases for each risk group, who received VMAT plans. The mean, maximum, and minimum doses, and conformity and homogeneity indexes were evaluated for planning target volume (PTV) and the mean dose and V20-V70 for organs at risk (OAR) including the rectum, bladder, right and left femoral heads, and rectum overlapped with PTV (ROP) regions. The numbers and volume percentages of cold spots within PTVs and ROP regions were measured using in-house software. Three-dimensional probabilistic distributions of the probability and distributions of cold spots were generated using a centroid matching technique for visualization and analysis. There was a statistically better dose conformity in the PTV, rectum, and bladder dose-sparing in VMAT compared to that in the IMRT plans, whereas VMAT had statistically worse target dose homogeneity, and right and left femoral head dose-sparing than those of the IMRT plans. The average volume percentage of cold spots per PTV for the VMAT was 4.37 ± 2.68%, which was smaller than the 5.72 ± 1.84% observed for IMRT plans (P = 0.007). The volume percentage of cold spots per ROP for the VMAT did not significantly differ from those for the IMRT plans. Compared with IMRT, the VMAT plans achieved better PTV dose conformity, OAR dose-sparing, and smaller cold spots in the treatment of prostate cancer.
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Affiliation(s)
- Tran Thi Thao Nguyen
- Division of Medical Quantum Science, Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
- Japan Society for the Promotion of Science, 5-3-1, Kojimachi, Chiyoda-ku, Tokyo, 102-0083, Japan
| | - Hidetaka Arimura
- Division of Medical Quantum Science, Department of Health Sciences, Faculty of Medical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
| | - Ryosuke Asamura
- Division of Medical Quantum Science, Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Taka-Aki Hirose
- Division of Medical Quantum Science, Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
- Department of Medical Technology, Kyushu University Hospital, 3-1-1, Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Saiji Ohga
- Division of Medical Quantum Science, Department of Health Sciences, Faculty of Medical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Jun-Ichi Fukunaga
- Department of Medical Technology, Kyushu University Hospital, 3-1-1, Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
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Genitourinary System Cancers. Radiat Oncol 2019. [DOI: 10.1007/978-3-319-97145-2_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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14
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Cosset JM, Nassef M, Saïdi R, Pugnaire J, Ben Abdennebi A, Noël A. [Which photon energy for intensity-modulated radiotherapy and volumetric-modulated arctherapy in 2019?]. Cancer Radiother 2018; 23:58-61. [PMID: 30551930 DOI: 10.1016/j.canrad.2018.04.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 04/14/2018] [Accepted: 04/17/2018] [Indexed: 01/02/2023]
Abstract
For more than a decade, the majority of radiation oncology centres have been delivering intensity-modulated radiotherapy (then volumetric-modulated arctherapy) with 6 MV photons as their standard of care. This « dogma » had been supported by the usual absence of dosimetric advantages with high-energy photons (15 to 18 MV or more), at least for the planning target volume and the dose received by the adjacent organs at risk, and by the neutron component as soon as the photon energy exceeds 10 MV. Recent data could question such a dogma. First, in 2019, one cannot avoid taking into account the integral dose, delivered outside the treated volume. Actually, most available data show that integral dose is higher with low energy photons (as 6 MV) than with higher energies. Moreover, recent studies have shown that the neutron component at high energies may have been overestimated in the past; in fact, the neutron dose appears to be lower, and sometimes much lower, than the dose we accept for imaging. Finally, a few cohort studies did not show any increase in second cancers incidence after high-energy photon radiotherapy. In such a context, the American Association of Physicists in Medicine (AAPM) TG 158 document, released a few months ago, clearly states that there is a trade-off between high- and low-energy treatments. High-energy therapy is associated with neutron production, while low-energy therapy results in higher stray photon dose. According to the AAPM, « the optimal energy is likely an intermediate such as 10 MV ».
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Affiliation(s)
- J-M Cosset
- GIE Charlebourg, Amethyst group, 65, avenue Foch, 92250 La Garenne-Colombes, France.
| | - M Nassef
- GIE Charlebourg, Amethyst group, 65, avenue Foch, 92250 La Garenne-Colombes, France
| | - R Saïdi
- GIE Charlebourg, Amethyst group, 65, avenue Foch, 92250 La Garenne-Colombes, France
| | - J Pugnaire
- GIE Charlebourg, Amethyst group, 65, avenue Foch, 92250 La Garenne-Colombes, France
| | - A Ben Abdennebi
- CNS CROM Compiègne, Amethyst group, 3, rue Jean-Jacques-Bernard, 60200 Compiègne, France
| | - A Noël
- Campus Sciences, centre de recherche en automatique de Nancy (Cran), BP 70239, 54506 Vandœuvre-lès-Nancy cedex, France; Campus Sciences, université de Lorraine, UMR 7039, BP 70239, 54506 Vandœuvre-lès-Nancy cedex, France; CNRS, UMR7039, Campus Sciences, BP 70239, 54506 Vandœuvre-lès-Nancy cedex, France
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15
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Cherpak AJ, Monajemi T, Chytyk-Praznik K, Mulroy L. Energy-dependent OAR sparing and dose conformity for total marrow irradiation of obese patients. J Appl Clin Med Phys 2018; 19:532-538. [PMID: 30099836 PMCID: PMC6123143 DOI: 10.1002/acm2.12413] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 06/06/2018] [Accepted: 06/13/2018] [Indexed: 11/09/2022] Open
Abstract
Purpose To investigate the effect on target coverage and organs at risk sparing by using 10 versus 6 MV for VMAT total marrow irradiation of obese patients. Methods and Materials Twenty‐six total marrow irradiation, TMI, treatment plans delivered between December 2014 and June 2017 were reviewed and 10 were chosen for replanning based on patient characteristics and plan metrics. Beam geometry and isocenter placement were conserved, energy was changed from 6 to 10 MV and plans were reoptimized. Resulting dose distributions were compared to original plans to evaluate any potential advantage of choosing one energy over the other. Results Target coverage and total monitor units were consistent between the 6 and 10 MV plans when averaged over all ten patients. Improvement in the conformity index (−11.0%, P = 0.009) when using 10 MV was statistically significant compared to the 6 MV plans. Volumes of normal tissue receiving 50%, 75%, and 90% Rx all decreased for the 10 MV plans compared to the original 6 MV plans. The mean dose to individual OARs decreased significantly for all investigated structures except for the lenses, oral cavity, and genitalia. The largest decreases in Dmean were found for the rectum (22.4%, P = 0.004) and bladder (18.1%, P = 0.005). The three highest priorities for sparing during plan optimization (lungs, liver, and heart), showed decreases of 7.6%, 16.1%, and 13.0%. Conclusions Use of a higher energy 10 MV beam provided similar dose to target while achieving increased OAR and normal tissue sparing for the patients reviewed in this study.
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Affiliation(s)
- Amanda J Cherpak
- Nova Scotia Cancer Centre, Nova Scotia Health Authority, Halifax, NS, Canada.,Department of Radiation Oncology, Dalhousie University, Halifax, NS, Canada.,Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS, Canada
| | - Thalat Monajemi
- Nova Scotia Cancer Centre, Nova Scotia Health Authority, Halifax, NS, Canada.,Department of Radiation Oncology, Dalhousie University, Halifax, NS, Canada.,Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS, Canada
| | - Krista Chytyk-Praznik
- Nova Scotia Cancer Centre, Nova Scotia Health Authority, Halifax, NS, Canada.,Department of Radiation Oncology, Dalhousie University, Halifax, NS, Canada.,Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS, Canada
| | - Liam Mulroy
- Nova Scotia Cancer Centre, Nova Scotia Health Authority, Halifax, NS, Canada.,Department of Radiation Oncology, Dalhousie University, Halifax, NS, Canada
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De Ornelas-Couto M, Mihaylov I, Dogan N. Assessment of Volumetric-Modulated Arc Therapy for Constant and Variable Dose Rates. J Med Phys 2018; 42:199-205. [PMID: 29296033 PMCID: PMC5744447 DOI: 10.4103/jmp.jmp_65_17] [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] [Indexed: 11/20/2022] Open
Abstract
Purpose: The aim of this study is to compare the effects of dose rate on volumetric-modulated arc therapy plans to determine optimal dose rates for prostate and head and neck (HN) cases. Materials and Methods: Ten prostate and ten HN cases were retrospectively studied. For each case, seven plans were generated: one variable dose rate (VDR) and six constant dose rate (CDR) (100–600 monitor units [MUs]/min) plans. Prescription doses were: 80 Gy to planning target volume (PTV) for the prostate cases, and 70, 60, and 54 Gy to PTV1, PTV2, and PTV3, respectively, for HN cases. Plans were normalized to 95% of the PTV and PTV1, respectively, with the prescription dose. Plans were assessed using Dose-Volume-Histogram metrics, homogeneity index, conformity index, MUs, and delivery time. Results: For the prostate cases, significant differences were found for rectum D35 between VDR and all CDR plans, except CDR500. Furthermore, VDR was significantly different than CDR100 and 200 for bladder D50. Delivery time for all CDR plans and MUs for CDR400–600 were significantly higher when compared to VDR. HN cases showed significant differences between VDR and CDR100, 500 and 600 for D2 to the cord and brainstem. Significant differences were found for delivery time and MUs for all CDR plans, except CDR100 for number of MUs. Conclusion: The most significant differences were observed in delivery time and number of MUs. All-in-all, the best CDR for prostate cases was found to be 300 MUs/min and 200 or 300 MUs/min for HN cases. However, VDR plans are still the choice in terms of MU efficiency and plan quality.
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Affiliation(s)
| | - Ivaylo Mihaylov
- Department of Radiation Oncology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Nesrin Dogan
- Department of Radiation Oncology, University of Miami Miller School of Medicine, Miami, FL, USA
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17
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Zaleska A, Bogaczyk K, Piotrowski T. Influence of optimizing protocol choice on the integral dose value in prostate radiotherapy planning by dynamic techniques - Pilot study. Rep Pract Oncol Radiother 2017; 22:415-419. [PMID: 28855852 DOI: 10.1016/j.rpor.2017.04.003] [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: 09/17/2016] [Revised: 12/27/2016] [Accepted: 04/19/2017] [Indexed: 11/16/2022] Open
Abstract
AIM The purpose of this study was to compare the values of integral dose, calculated for treatment plans of dynamic radiotherapy techniques prepared with two different optimization protocols. BACKGROUND Delivering radiation by IMRT, VMAT and also HT techniques has an influence on the low dose deposition of large areas of the patient body. Delivery of low dose can induce injury of healthy cells. In this situation, a good solution would be to reduce the area, which receives a low dose, but with appropriate dose level for the target volume. MATERIALS AND METHODS To calculate integral dose values of plans structures, we used 90 external beam radiotherapy plans prepared for three techniques (intensity modulated radiotherapy, volumetric modulated arc therapy and helical tomotherapy). One technique includes three different geometry combinations. 45 plans were prepared with classic optimization protocol and 45 with rings optimization protocol which should reduce the low doses in the normal tissue. RESULTS Differences in values of the integral dose depend on the geometry and technique of irradiation, as well as optimization protocol used in preparing treatment plans. The application of the rings optimization caused the value of normal tissue integral dose (NTID) to decrease. CONCLUSION It is possible to limit the area of low dose irradiation and reduce NTID in dynamic techniques with the same clinical constraints for OAR and PTV volumes by using an optimization protocol other than the classic one.
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Affiliation(s)
- Anna Zaleska
- Department of Medical Physics, Greater Poland Cancer Centre, Poznan, Poland
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | | | - Tomasz Piotrowski
- Department of Medical Physics, Greater Poland Cancer Centre, Poznan, Poland
- Department of Electroradiology, University of Medical Sciences, Poznan, Poland
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18
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Sakthivel V, Mani GK, Mani S, Boopathy R. Radiation-Induced Second Cancer Risk from External Beam Photon Radiotherapy for Head and Neck Cancer: Impact on in-Field and Out-of-Field Organs. Asian Pac J Cancer Prev 2017; 18:1897-1903. [PMID: 28749618 PMCID: PMC5648396 DOI: 10.22034/apjcp.2017.18.7.1897] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
The purpose of this paper is to provide data on development of second primary cancers within or adjacent to tissue irradiated in the treatment of primary head and neck cancers using different techniques and modalities. Materials and methods: We selected five patients with HandN tumors located in base of the tongue for risk assessment. In order to examine the impact of choices of various planning techniques, numbers of beams and beam energy used in treatment plans - 7 and 9 field Intensity modulated radiotherapy (IMRT) plans using 6MV and 10 MV beam energies and a 6MV Volumetric modulated arc therapy (VMAT) plans were planned. Out-of-field measurements for secondary photon doses for the treatment plans were measured using diode-dosimeters and solid water slabs. Differential dose-volume histograms (DVH) for all 5 patients and 5 techniques, were exported and used to calculate organ equivalent dose (OAR), excess absolute risk (EAR), and life-time attributable risk (LAR) for in-field organs. Results: For all treatment plans, the DVH showed clinically acceptable values; adequate clinical target coverage and dose constraints were met for all organs at risk. There was a clear advantage for the VMAT plan; it provided superior organ at risk (OAR) sparing and adequate target coverage. VMAT has relatively low monitor units at 0.93±0.034 times 7F6. The average percentage scattered to prescription doses for the five patients at 15, 30, 45, 60 and 75 cm from the isocenter were 0.9212 ± 0.115, 0.2621 ± 0.080, 0.1617 ± 0.057, 0.0936 ± 0.026, 0.0296 ± 0.014, for VMAT. Conclusion: Organ-specific LAR was higher with VMAT compared to 7F6 for skin. 6-MV VMAT is an acceptable alternative to IMRT for HandN cancer and offers advantages in terms of sparing adjacent OAR.
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Affiliation(s)
- Vasanthan Sakthivel
- Research and Development Centre, Bharathiar University, Coimbatore, India
- Advanced Medical Physics, Houston, Texas, United States.
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19
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Sánchez-Nieto B, Romero-Expósito M, Terrón JA, Sánchez-Doblado F. Uncomplicated and Cancer-Free Control Probability (UCFCP): A new integral approach to treatment plan optimization in photon radiation therapy. Phys Med 2017; 42:277-284. [PMID: 28392313 DOI: 10.1016/j.ejmp.2017.03.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 03/24/2017] [Accepted: 03/29/2017] [Indexed: 12/25/2022] Open
Abstract
PURPOSE Biological treatment plan evaluation does not currently consider second cancer induction from peripheral doses associated to photon radiotherapy. The aim is to propose a methodology to characterize the therapeutic window by means of an integral radiobiological approach, which considers not only Tumour Control Probability (TCP) and Normal Tissue Complication Probability (NTCP) but also Secondary Cancer Probability (SCP). METHODS Uncomplicated and Cancer-Free Control Probability (UCFCP) function has been proposed assuming a statistically uncorrelated response for tumour and normal tissues. The Poisson's and Lyman's models were chosen for TCP and NTCP calculations, respectively. SCP was modelled as the summation of risks associated to photon and neutron irradiation of radiosensitive organs. For the medium (>4Gy) and low dose regions, mechanistic and linear secondary cancer risks models were used, respectively. Two conformal and intensity-modulated prostate plans at 15MV (same prescription dose) were selected to illustrate the UCFCP features. RESULTS UCFCP exhibits a bell-shaped behaviour with its maximum inside the therapeutic window. SCP values were not different for the plans analysed (∼2.4%) and agreed with published epidemiological results. Therefore, main differences in UCFCP came from differences in rectal NTCP (18% vs 9% for 3D-CRT and IMRT, respectively). According to UCFCP values, the evaluated IMRT plan ranked first. CONCLUSIONS The level of SCP was found to be similar to that of NTCP complications which reinforces the importance of considering second cancer risks as part of the possible late sequelae due to treatment. Previous concerns about the effect of peripheral radiation, especially neutrons, in the induction of secondary cancers can be evaluated by quantifying the UCFCP.
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Affiliation(s)
- Beatriz Sánchez-Nieto
- Instituto de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4880, Macul, Santiago, Chile.
| | - Maite Romero-Expósito
- Departament de Física, Universitat Autònoma de Barcelona, Edifici C, Campus UAB E-08193, Bellaterra, Spain.
| | - José A Terrón
- Servicio de Radiofísica, Hospital Universitario Virgen Macarena, Av. Doctor Fedriani, 3, 41009 Sevilla, Spain.
| | - Francisco Sánchez-Doblado
- Servicio de Radiofísica, Hospital Universitario Virgen Macarena, Av. Doctor Fedriani, 3, 41009 Sevilla, Spain; Departamento de Fisiología Médica y Biofísica, Universidad de Sevilla, Av. Doctor Fedriani S/N, 41009 Sevilla, Spain.
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Abstract
This article is a short review of PET tracers, which have been used in clinical routine in single institutions. Preliminary anecdotal research supports the use of PET techniques in therapy planning of prostate cancer. The existing literature is discussed. For external beam radiation therapy, the biological target volume definition can only be based on PET imaging. There are not yet any prospective and randomized trials available; therefore, single-institution experiences cannot yet be recommended as clinical routine.
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Affiliation(s)
- Kalevi J A Kairemo
- Department of Molecular Radiotherapy, Docrates Cancer Center, Saukonpaadenranta 2, Helsinki FI-00180, Finland; Department of Nuclear Medicine, Docrates Cancer Center, Saukonpaadenranta 2, Helsinki FI-00180, Finland; Department of Nuclear Medicine, The University of Texas MD Anderson Cancer Center, 1400 Pressler Street, Houston, TX 77030, USA.
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21
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Zhao J, Cheng G, Liu J. Combination of intensity modulated radiotherapy followed treatment with p38 MAPK activation inhibitor inhibits the proliferation of MCF-7 breast cancer cells. Saudi J Biol Sci 2017; 25:10-14. [PMID: 29379349 PMCID: PMC5775077 DOI: 10.1016/j.sjbs.2017.01.061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Revised: 01/28/2017] [Accepted: 01/30/2017] [Indexed: 10/31/2022] Open
Abstract
The present study was aimed to investigate the effect of intensity modulated radiotherapy (IMRT) followed by treatment with inhibitor for p38 MAPK, SB203580 on the rate of proliferation in drug resistant MCF-7 breast cancer cells. Interestingly, the results from immuno histochemistry and western blot assays revealed higher level of distribution of activated p38 MAPK in the drug resistant breast cancer tissues compared to the primary tissues. Treatment of the drug resistant MCF-7 cells with SB203580 led to a significant decrease in the phosphorylation of p38 MAPK. Exposure to IMRT caused a significant decrease in the rate of proliferation in drug resistant MCF-7breast cancer cells (P < 0.05). MCF-7 cells were subjected to IMRT for 45 min followed by treatment with SB203580 for 12 h. The results from MTT assay revealed inhibition in the rate of proliferation of MCF-7 cells more efficiently compared to the IMRT or SB203580 when used separately (P < 0.02). The effect of IMRT and SB203580 on inhibition of MCF-7 cell proliferation showed synergistic relation. Since MAPK signaling pathway plays an important role in the development of drug resistance, therefore, inhibition of p38 MAPK activation by the combination of IMRT followed by treatment with inhibitor for p38 MAPK can be a promising strategy for breast cancer treatment. Thus combination of IMRT exposure and treatment with SB203580 can be used for the inhibition of drug resistant breast cancer.
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Affiliation(s)
- Jianhua Zhao
- Imaging Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.,Department of Image Medicine, Inner Mongolia People's hospital, Hohhot 010017, China
| | - Guanxun Cheng
- Imaging Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Jing Liu
- Department of Ultrasonic Medicine, Inner Mongolia People's Hospital, Hohhot 010017. China
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22
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Xu H, Hatcher G. Treatment planning study of Volumetric Modulated Arc Therapy and three dimensional field-in-field techniques for left chest-wall cancers with regional lymph nodes. Rep Pract Oncol Radiother 2016; 21:517-524. [PMID: 27698592 PMCID: PMC5036511 DOI: 10.1016/j.rpor.2016.07.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Revised: 03/31/2016] [Accepted: 07/07/2016] [Indexed: 11/22/2022] Open
Abstract
AIM This study aims to investigate whether there are dosimetric advantages to using VMAT (Volumetric Modulated Arc Therapy) for left-sided chest-wall patients over the three-dimensional conformal field-in-field (FinF) technique. BACKGROUND There is a lack of dosimetric studies dedicated for chest-wall patients. Potential dosimetric advantage could be obtained using VMAT due to complex geometry of PTVs (Planning Target Volumes) and OARs (Organs at Risk) in chest-wall and lymph nodes. MATERIALS AND METHODS VMAT and FinF plans were generated and evaluated based on DVHs (Dose Volume Histograms) for both PTVs and OARs for 22 left-sided chest-wall patients with involved regional nodes. PTV HIs (Homogeneity Indices) and CIs (Conformity Indices), and EUDs (Equivalent Uniform Doses) for PTVs and OARs were also evaluated for comparisons between VMAT and FinF. RESULTS FinF planning met PTV criteria adequately in all cases except two. In these two cases, VMAT was able to meet PTV criteria adequately. VMAT demonstrated significant reduction in left lung V20 Gy in chest-wall patients compared to FinF plans. The volumes of the right lung and right breast receiving 5 Gy were much higher in VMAT than those in FinF for all patients. CONCLUSIONS Compared to the FinF technique, there is a generally limited benefit using VMAT for left-sided chest-wall patients due to large low-dose-bath to OARs with insignificant improvement in PTV coverage. In case where FinF planning cannot meet dose constrains, VMAT provides a viable option. The use of VMAT planning over the FinF technique in chest-wall cancers should be carefully analyzed on an individual basis.
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Affiliation(s)
- Heping Xu
- Cape Breton Cancer Centre, Nova Scotia Health Authority, 1482 George St., Sydney, NS, Canada B1P 1P3
- Department of Radiation Oncology, Dalhousie University, Halifax, NS, Canada
| | - Gillian Hatcher
- Cape Breton Cancer Centre, Nova Scotia Health Authority, 1482 George St., Sydney, NS, Canada B1P 1P3
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23
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Pathmanathan AU, Alexander EJ, Huddart RA, Tree AC. The delineation of intraprostatic boost regions for radiotherapy using multimodality imaging. Future Oncol 2016; 12:2495-2511. [PMID: 27322113 DOI: 10.2217/fon-2016-0129] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Dose escalation to the prostate improves tumor control but at the expense of increased rectal toxicity. Modern imaging can be used to detect the most common site of recurrence, the intraprostatic lesion (IPL), which has led to the concept of focusing dose escalation to the IPL in order to improve the therapeutic ratio. Imaging must be able to detect lesions with adequate sensitivity and specificity to accurately delineate the IPL. This information must be carefully integrated into the radiotherapy planning process to ensure the dose is targeted to the IPL. This review will consider the role and challenges of multiparametric MRI and PET computed tomography in delineating a tumor boost to be delivered by external beam radiotherapy.
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Affiliation(s)
| | - Emma J Alexander
- The Royal Marsden NHS Foundation Trust, Downs Road, Sutton, SM2 5PT, UK
| | - Robert A Huddart
- The Institute of Cancer Research, 123 Old Brompton Road, London, SW7 3RP, UK
| | - Alison C Tree
- The Royal Marsden NHS Foundation Trust, Downs Road, Sutton, SM2 5PT, UK
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24
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Bladder radiotherapy treatment: A retrospective comparison of 3-dimensional conformal radiotherapy, intensity-modulated radiation therapy, and volumetric-modulated arc therapy plans. Med Dosim 2016; 42:1-6. [PMID: 27751618 DOI: 10.1016/j.meddos.2016.09.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 07/22/2016] [Accepted: 09/09/2016] [Indexed: 11/21/2022]
Abstract
To examine tumor׳s and organ׳s response when different radiotherapy plan techniques are used. Ten patients with confirmed bladder tumors were first treated using 3-dimensional conformal radiotherapy (3DCRT) and subsequently the original plans were re-optimized using the intensity-modulated radiation treatment (IMRT) and volumetric-modulated arc therapy (VMAT)-techniques. Targets coverage in terms of conformity and homogeneity index, TCP, and organs׳ dose limits, including integral dose analysis were evaluated. In addition, MUs and treatment delivery times were compared. Better minimum target coverage (1.3%) was observed in VMAT plans when compared to 3DCRT and IMRT ones confirmed by a statistically significant conformity index (CI) results. Large differences were observed among techniques in integral dose results of the femoral heads. Even if no statistically significant differences were reported in rectum and tissue, a large amount of energy deposition was observed in 3DCRT plans. In any case, VMAT plans provided better organs and tissue sparing confirmed also by the normal tissue complication probability (NTCP) analysis as well as a better tumor control probability (TCP) result. Our analysis showed better overall results in planning using VMAT techniques. Furthermore, a total time reduction in treatment observed among techniques including gantry and collimator rotation could encourage using the more recent one, reducing target movements and patient discomfort.
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25
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Biegała M, Hydzik A. Analysis of dose distribution in organs at risk in patients with prostate cancer treated with the intensity-modulated radiation therapy and arc technique. J Med Phys 2016; 41:198-204. [PMID: 27651567 PMCID: PMC5019039 DOI: 10.4103/0971-6203.189490] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
This study describes a comparative analysis of treatment plans in 48 patients with prostate cancer treated with ionizing radiation. Each patient was subjected to the intensity-modulated radiation therapy (IMRT) and arc technique. In each treatment plan, the organs at risk were assessed: the urinary bladder, rectum and heads of the femur, as well as the volume of normal tissue. The following features were compared: treatment time, conformity indices for the planning target volume, mean doses and standard deviation in organs at risk, and organ volumes for each particular dose. The treatment period in the arc technique is 13.7% shorter than in the IMRT technique. Comparing the results of the IMRT and arc techniques (arc vs. IMRT), the mean values were 29.21 ± 12.91 Gy versus 28.36 ± 13.79 Gy for the bladder, 20.36 ± 3.16 Gy versus 18.17 ± 5.11 Gy for the right femoral head, and 18.98 ± 3.28 Gy versus 16.67 ± 5.15 Gy for the left femoral head. For the rectum, lower values were obtained after application of the arc technique, not the IMRT technique: 35.84 ± 12.28 Gy versus 35.90 ± 13.05 Gy. The results indicate that the applied therapy has a statistically significant influence on the volume for a particular dose with regard to the urinary bladder. It is advisable to apply the IMRT technique to patients who need the femur heads and urinary bladder protected by exposing them to low irradiation doses.
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Affiliation(s)
- Michał Biegała
- Department of Medical Imaging Technology, Faculty of Biomedical Sciences and Postgraduate Training, Medical University of Lodz, 90-251, Lodz, Poland; Department of Medical Physics, Regional Cancer Center, Copernicus Memorial Hospital of Lodz, 93-513 Lodz, Poland
| | - Adam Hydzik
- Department of Medical Physics, Regional Cancer Center, Copernicus Memorial Hospital of Lodz, 93-513 Lodz, Poland
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Kleiner H, Podgorsak MB. The dosimetric significance of using 10 MV photons for volumetric modulated arc therapy for post-prostatectomy irradiation of the prostate bed. Radiol Oncol 2016; 50:232-7. [PMID: 27247557 PMCID: PMC4852958 DOI: 10.1515/raon-2016-0012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 01/08/2016] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND The purpose of the study was to analyse the dosimetric differences when using 10 MV instead of 6 MV for VMAT treatment plans for post-prostatectomy irradiation of the prostate bed. METHODS AND MATERIALS Ten post-prostatectomy prostate bed irradiation cases previously treated using 6 MV with volumetric modulated arc therapy (VMAT) were re-planned using 10 MV with VMAT. Prescription dose was 66.6 Gy with 1.8 Gy per fraction for 37 daily fractions. The same structure set, number of arcs, field sizes, and minimum dose to the Planning Target Volume (PTV) were used for both 6 MV and 10 MV plans. Results were collected for dose to Organs at Risk (OAR) constraints, dose to the target structures, number of monitor units for each arc, Body V5, Conformity Index, and Integral Dose. The mean values were used to compare the 6 MV and 10 MV results. To determine the statistical significance of the results, a paired Student t test and power analysis was performed. RESULTS Statistically significant lower mean values were observed for the OAR dose constraints for the rectum, bladder-Clinical Target Volume (bladder-CTV), left femoral head, and right femoral head. Also, statistically significant lower mean values were observed for the Body V5, Conformity Index, and Integral Dose. CONCLUSIONS Several dosimetric benefits were observed when using 10 MV instead of 6 MV for VMAT based treatment plans. Benefits include sparing more dose from the OAR while still maintaining the same dose coverage to the PTV. Other benefits include lower Body V 5,Conformity Index, and Integral Dose.
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Studenski MT, Valenciaga Y, Abramowitz MC, Stoyanova R, Bossart E, Dogan N, Pollack A. Quantification of the margin required for treating intraprostatic lesions. J Appl Clin Med Phys 2016; 17:304-312. [PMID: 27167286 PMCID: PMC5690932 DOI: 10.1120/jacmp.v17i3.6089] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Revised: 02/16/2016] [Accepted: 01/21/2016] [Indexed: 11/23/2022] Open
Abstract
Advances in magnetic resonance imaging (MRI) sequences allow physicians to define the dominant intraprostatic lesion (IPL) in prostate radiation therapy treat-ments allowing for dose escalation and potentially increased tumor control. This work quantifies the margin required around the MRI-defined IPL accounting for both prostate motion and deformation. Ten patients treated with a simultaneous integrated intraprostatic boost (SIIB) were retrospectively selected and replanned with incremental 1 mm margins from 0-5 mm around the IPL to determine if there were any significant differences in dosimetric parameters. Sensitivity analysis was then performed accounting for random and systematic uncertainties in both prostate motion and deformation to ensure adequate dose was delivered to the IPL. Prostate deformation was assessed using daily CBCT imaging and implanted fiducial markers. The average IPL volume without margin was 2.3% of the PTV volume and increased to 11.8% with a 5 mm margin. Despite these changes in vol-ume, the only statistically significant dosimetric difference was found for the PTV maximum dose, which increased with increasing margin. The sensitivity analysis demonstrated that a 3.0 mm margin ensures > 95% IPL coverage accounting for both motion and deformation. We found that a margin of 3.0 mm around the MRI defined IPL is sufficient to account for random and systematic errors in IPL posi-tion for the majority of cases.
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Combining high dose external beam radiotherapy with a simultaneous integrated boost to the dominant intraprostatic lesion: Analysis of genito-urinary and rectal toxicity. Radiother Oncol 2016; 119:398-404. [PMID: 27162160 DOI: 10.1016/j.radonc.2016.04.031] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 04/04/2016] [Accepted: 04/20/2016] [Indexed: 12/09/2022]
Abstract
BACKGROUND AND PURPOSE Local recurrences after radiotherapy are dose-dependent and occur in the dominant intraprostatic lesion (DIL). The purpose of this study was to evaluate the impact of a simultaneous integrated boost (SIB) to the magnetic resonance imaging (MRI)-defined DIL on toxicity. MATERIALS AND METHODS Four-hundred and ten patients were treated with intensity-modulated radiotherapy. A median dose of 78Gy was prescribed to the prostate. A SIB of 82Gy to the DIL was performed in 225 patients (SIB+). Genitourinary and rectal toxicity on fixed time points up to 8years were compared between SIB- (185 patients) and SIB+ patients. Chi-square, Fisher's exact and Kaplan-Meier statistics were applied. With a median follow up of 72months, the six-year actuarial risk of genitourinary and rectal toxicity grade⩾2 was 31% and 12% respectively. The actuarial risk of developing toxicity and incidence of symptoms at fixed time points were not increased with a SIB. CONCLUSION Performing a SIB did not increase genitourinary or rectal toxicity up to 8years' follow-up.
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Chang Y, Yang ZY, Li GL, Li Q, Yang Q, Fan JQ, Zhao YC, Song YQ, Wu G. Correlations Between Radiation Dose in Bone Marrow and Hematological Toxicity in Patients With Cervical Cancer: A Comparison of 3DCRT, IMRT, and RapidARC. Int J Gynecol Cancer 2016; 26:770-6. [DOI: 10.1097/igc.0000000000000660] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
ObjectiveTo comparatively evaluate the hematological toxicity (HT) associated with 3 concurrent chemoradiotherapies that are routinely used to treat cervical cancer, including 3-dimensional conformal radiotherapy (3DCRT), intensity-modulated radiation therapy (IMRT), and RapidARC and to establish a new normal tissue complication probability model of bone marrow (BM) to predict HT in cervical cancer patients undergoing concurrent chemoradiotherapy.MethodsPatients with cervical cancer (N = 100) who received concurrent cisplatin and whole-pelvic radiotherapy were enrolled in this study. Dosimetric parameters (including V10, V20, V30, and V40 and mean doses to the pelvic bone) and HT were analyzed.ResultsThe V20, V30, and V40 and mean doses to the BM were lower in the IMRT and RapidARC groups than in the 3DCRT group, and the RapidARC group had higher V10 and V40 and mean values than the IMRT group. The V20, V30, and V40 and the mean dose to the pelvic bone were positively correlated with HT. Generalized linear normal tissue complication probability models of white blood cell (WBC) and absolute neutrophil cell (ANC) nadirs and BM V20 were established as follows: WBC nadir = 3.382 – 4.056 • V20 + 0.295 • baseline of WBC (adjusted R2 = 0.246, F = 15.847) and ANC nadir = 2.438 – 2.780 • V20 + 0.233 • baseline of ANC (adjusted R2 = 0.236, F = 16.282).ConclusionsThis study suggests that IMRT results in milder hematological toxicity than either 3DCRT or RapidARC. Dosimetric parameters were associated with the incidence of HT in cervical cancer patients who received concurrent chemoradiotherapies.
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Uzan J, Nahum AE, Syndikus I. Prostate Dose-painting Radiotherapy and Radiobiological Guided Optimisation Enhances the Therapeutic Ratio. Clin Oncol (R Coll Radiol) 2015; 28:165-70. [PMID: 26482453 DOI: 10.1016/j.clon.2015.09.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 08/12/2015] [Accepted: 09/03/2015] [Indexed: 11/25/2022]
Abstract
AIMS To describe the treatment of 11 patients with radiobiologically guided dose-painting radiotherapy and report on toxicity. MATERIALS AND METHODS Boost volumes were identified with functional magnetic resonance imaging scans in 11 patients with high-risk prostate cancer. Patients were treated using a dose-painting approach; the boost dose was limited to 86 Gy in 37 fractions, while keeping the rectal normal tissue complication probability to 5-6%. Rotational intensity-modulated radiotherapy was used with daily image guidance and fiducial markers. RESULTS The median dose to the prostate (outside the boost volume) and urethra was 75.4 Gy/37 fractions (range 75.1-75.8 Gy), whereas the median boost dose was 83.4 Gy (range 79.0-87.4 Gy). The tumour control probability (TCP) (Marsden model) increased from 71% for the standard plans to 83.6% [76.6-86.8%] for the dose-painting boost plans. The mean (Lyman-Kutcher-Burman) normal tissue complication probability for rectal bleeding was 5.2% (range 3.3-6.2%) and 5.2% for faecal incontinence (range 3.6-7.8%). All patients tolerated the treatment well, with a low acute toxicity profile. At a median follow-up of 36 months (range 24-50) there was no grade 3 late toxicity. Two patients had grade 2 late urinary toxicity (urethral stricture, urinary frequency and urgency), one patient had grade 1 and one grade 2 late rectal toxicity. The mean prostate-specific antigen at follow-up was 0.81 ng/ml after stopping hormone therapy; one patient relapsed biochemically at 32 months (2.70 ng/ml). CONCLUSIONS The toxicity for this radiobiological guided dose-painting protocol was low, but we have only treated a small cohort with limited follow-up time. The advantages of this treatment approach should be established in a clinical trial.
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Affiliation(s)
- J Uzan
- Physics Department, Clatterbridge Cancer Centre, Bebington, UK
| | - A E Nahum
- Physics Department, Clatterbridge Cancer Centre, Bebington, UK
| | - I Syndikus
- Radiotherapy Department, Clatterbridge Cancer Centre, Bebington, UK.
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Kumar L, Yadav G, Raman K, Bhushan M, Pal M. The dosimetric impact of different photon beam energy on RapidArc radiotherapy planning for cervix carcinoma. J Med Phys 2015; 40:207-13. [PMID: 26865756 PMCID: PMC4728891 DOI: 10.4103/0971-6203.170787] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 07/29/2015] [Accepted: 08/05/2015] [Indexed: 11/18/2022] Open
Abstract
The main purpose of this study is to know the effect of three different photon energies viz., 6, 10, and 15 mega voltage (MV) on RapidArc (RA) planning for deep-seated cervix tumor and to develop clinically acceptable RA plans with suitable photon energy. RA plans were generated for 6, 10, and 15 MV photon energies for twenty patients reported with cervix carcinoma. RA plans were evaluated in terms of planning target volume (PTV) coverage, dose to organs at risk (OARs), conformity index (CI), homogeneity index (HI), gradient measure, external volume index of dose distribution produced, total number of monitor units (MUs), nontumor integral dose (ID), and low dose volume of normal tissue. A two-sample paired t-test was performed to compare the dosimetric parameters of RA plans. Irrespective of photon energy used for RA planning, plans were dosimetrically similar in terms of PTV coverage, OARs sparing, CI and HI. The numbers of MUs were 13.4 ± 1.4% and 18.2 ± 1.5% higher and IDs were 2.7 ± 0.8% and 3.7 ± 0.9% higher in 6 MV plans in comparison to that in the 10 and 15 MV plans, respectively. V1Gy, V2Gy, V3Gy, and V4Gy were higher in 6 MV plans in comparison to that in 10 and 15 MV plans. Based on this study, 6 MV photon beam is a good choice for RA planning in case of cervix carcinoma, as it does not deliver additional exposure to patients caused by photoneutrons produced in high energy beams.
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Affiliation(s)
- Lalit Kumar
- Department of Radiotherapy, Medical Physics Division, Rajiv Gandhi Cancer Institute and Research Centre, Rohini, New Delhi, India
| | - Girigesh Yadav
- Department of Radiotherapy, Medical Physics Division, Rajiv Gandhi Cancer Institute and Research Centre, Rohini, New Delhi, India
| | - Kothanda Raman
- Department of Radiotherapy, Medical Physics Division, Rajiv Gandhi Cancer Institute and Research Centre, Rohini, New Delhi, India
| | - Manindra Bhushan
- Department of Radiotherapy, Medical Physics Division, Rajiv Gandhi Cancer Institute and Research Centre, Rohini, New Delhi, India
| | - Manoj Pal
- Department of Radiotherapy, Medical Physics Division, Rajiv Gandhi Cancer Institute and Research Centre, Rohini, New Delhi, India
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Tu SJ, Yang PY, Lo CJ. Effect of External Targeted Radiotherapy on Dosimetry Due to Rapid Clearance of Gold Nanoparticles. J Med Biol Eng 2015. [DOI: 10.1007/s40846-015-0081-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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A comparison of the acute toxicities using moderate hypo-fractionated intensity-modulated radiation therapy or volumetric modulated arc therapy for the treatment of early-stage prostate cancer. JOURNAL OF RADIOTHERAPY IN PRACTICE 2015. [DOI: 10.1017/s1460396915000242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
AbstractAimThis study compared the acute toxicities reported during radiotherapy treatment using either intensity-modulated radiation therapy (IMRT) or volumetric-modulated arc therapy (VMAT) to deliver a moderate hypo-fractionated treatment for early-stage prostate cancer.Material and methodsAcute toxicities are routinely reported at the clinical site for all patients using the Common Terminology Criteria for Adverse Events. Toxicity assessment is performed on day 1 of treatment, then once weekly thereafter. The recorded toxicities of 40 cases treated with five-field IMRT, and 32 cases treated using VMAT were retrospectively compared. All cases were prescribed 73·68 Gy in 28 fractions. Eight symptoms were assessed; diarrhoea, proctitis, fatigue, pain, dermatitis, urinary frequency, urinary retention and urinary tract pain.ResultsIn terms of the overall toxicity recorded, VMAT was shown to reduce the toxicities of dermatitis, fatigue, pain and urinary frequency (p<0·05). Using IMRT, grade 2 toxicities were reported for proctitis, pain, urinary frequency, urinary retention and urinary tract pain. Using VMAT, grade 2 toxicities were reported for urinary frequency and urinary retention.FindingsThe research reported here is one of the first publications to demonstrate that VMAT is associated with decreased toxicities compared with IMRT for the treatment of early-stage prostate cancer.
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Fonteyne V, Sadeghi S, Ost P, Vanpachtenbeke F, Vuye P, Lumen N, De Meerleer G. Impact of changing rectal dose volume parameters over time on late rectal and urinary toxicity after high-dose intensity-modulated radiotherapy for prostate cancer: A 10-years single centre experience. Acta Oncol 2015; 54:854-61. [PMID: 25387271 DOI: 10.3109/0284186x.2014.974826] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND External beam radiotherapy is an excellent treatment for patients with prostate cancer (PC). Assessing long-term radiotherapy-induced toxicity is important. We evaluated the impact of implementing different rectal dose volume constraints (DVC) on late rectal and urinary toxicity. MATERIAL AND METHODS Six hundred and thirty-seven PC patients were treated with high-dose intensity-modulated radiotherapy (IMRT) in the primary (median dose of 78 Gy to the prostate) or postoperative setting [median dose of 74 (adjuvant) and 76 Gy (salvage) to the prostatic bed]. Three groups were defined according to different DVC applied over time. The incidence of late rectal and urinary toxicity was evaluated. Three-year actuarial risk estimations of grade 2-3 rectal and urinary toxicity were calculated (Kaplan-Meier statistics). RESULTS Median follow-up was five years. Overall, the incidence of late grade 3 and 2 rectal toxicity was 1% and 11%. The calculated three-year actuarial risk of developing late grade≥2 rectal toxicity decreased from 16% to 7% and 5% for patients in Group 1, Group 2 and Group 3, respectively (p<0.001). Respectively, 17 (4%) and 98 (24%) patients developed grade 3 and 2 late urinary toxicity in the primary setting. In the postoperative setting, 15 (6%) and 62 (26%) patients developed grade 3 and 2 urinary toxicity, respectively. The three-year actuarial risk of developing late≥grade 2 urinary toxicity in primary- and postoperative-treated patients was 22% and 23%, respectively. This was not significantly different between the three groups. CONCLUSION The majority of patients developed no or only moderate rectal toxicity after high-dose IMRT for PC. Implementing different rectal DVC resulted in a significant decrease of late rectal toxicity without affecting urinary toxicity.
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Affiliation(s)
- Valérie Fonteyne
- Ghent University Hospital, Department of Radiation Oncology and Experimental Cancer Research , Belgium
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Kuang Y, Wu L, Hirata E, Miyazaki K, Sato M, Kwee SA. Volumetric modulated arc therapy planning for primary prostate cancer with selective intraprostatic boost determined by 18F-choline PET/CT. Int J Radiat Oncol Biol Phys 2015; 91:1017-25. [PMID: 25832692 PMCID: PMC4405528 DOI: 10.1016/j.ijrobp.2014.12.052] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 12/23/2014] [Accepted: 12/29/2014] [Indexed: 02/05/2023]
Abstract
PURPOSE This study evaluated expected tumor control and normal tissue toxicity for prostate volumetric modulated arc therapy (VMAT) with and without radiation boosts to an intraprostatically dominant lesion (IDL), defined by (18)F-choline positron emission tomography/computed tomography (PET/CT). METHODS AND MATERIALS Thirty patients with localized prostate cancer underwent (18)F-choline PET/CT before treatment. Two VMAT plans, plan79 Gy and plan100-105 Gy, were compared for each patient. The whole-prostate planning target volume (PTVprostate) prescription was 79 Gy in both plans, but plan100-105 Gy added simultaneous boost doses of 100 Gy and 105 Gy to the IDL, defined by 60% and 70% of maximum prostatic uptake on (18)F-choline PET (IDLsuv60% and IDLsuv70%, respectively, with IDLsuv70% nested inside IDLsuv60% to potentially enhance tumor specificity of the maximum point dose). Plan evaluations included histopathological correspondence, isodose distributions, dose-volume histograms, tumor control probability (TCP), and normal tissue complication probability (NTCP). RESULTS Planning objectives and dose constraints proved feasible in 30 of 30 cases. Prostate sextant histopathology was available for 28 cases, confirming that IDLsuv60% adequately covered all tumor-bearing prostate sextants in 27 cases and provided partial coverage in 1 case. Plan100-105 Gy had significantly higher TCP than plan79 Gy across all prostate regions for α/β ratios ranging from 1.5 Gy to 10 Gy (P<.001 for each case). There were no significant differences in bladder and femoral head NTCP between plans and slightly lower rectal NTCP (endpoint: grade ≥ 2 late toxicity or rectal bleeding) was found for plan100-105 Gy. CONCLUSIONS VMAT can potentially increase the likelihood of tumor control in primary prostate cancer while observing normal tissue tolerances through simultaneous delivery of a steep radiation boost to a (18)F-choline PET-defined IDL.
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Affiliation(s)
- Yu Kuang
- Department of Medical Physics, University of Nevada Las Vegas, Las Vegas, Nevada
| | - Lili Wu
- Department of Medical Physics, University of Nevada Las Vegas, Las Vegas, Nevada; Department of Radiation Oncology, Cancer Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Emily Hirata
- Hamamatsu/Queen's PET Imaging Center and Departments of Radiation Oncology and Oncology Research, The Queen's Medical Center, Honolulu, Hawaii
| | - Kyle Miyazaki
- Hamamatsu/Queen's PET Imaging Center and Departments of Radiation Oncology and Oncology Research, The Queen's Medical Center, Honolulu, Hawaii
| | - Miles Sato
- Hamamatsu/Queen's PET Imaging Center and Departments of Radiation Oncology and Oncology Research, The Queen's Medical Center, Honolulu, Hawaii
| | - Sandi A Kwee
- Hamamatsu/Queen's PET Imaging Center and Departments of Radiation Oncology and Oncology Research, The Queen's Medical Center, Honolulu, Hawaii; John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii.
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Hayashi A, Shibamoto Y, Hattori Y, Tamura T, Iwabuchi M, Otsuka S, Sugie C, Yanagi T. Dose-volume histogram comparison between static 5-field IMRT with 18-MV X-rays and helical tomotherapy with 6-MV X-rays. JOURNAL OF RADIATION RESEARCH 2015; 56:338-45. [PMID: 25609741 PMCID: PMC4380056 DOI: 10.1093/jrr/rru111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
We treated prostate cancer patients with static 5-field intensity-modulated radiation therapy (IMRT) using linac 18-MV X-rays or tomotherapy with 6-MV X-rays. As X-ray energies differ, we hypothesized that 18-MV photon IMRT may be better for large patients and tomotherapy may be more suitable for small patients. Thus, we compared dose-volume parameters for the planning target volume (PTV) and organs at risk (OARs) in 59 patients with T1-3 N0M0 prostate cancer who had been treated using 5-field IMRT. For these same patients, tomotherapy plans were also prepared for comparison. In addition, plans of 18 patients who were actually treated with tomotherapy were analyzed. The evaluated parameters were homogeneity indicies and a conformity index for the PTVs, and D2 (dose received by 2% of the PTV in Gy), D98, Dmean and V10-70 Gy (%) for OARs. To evaluate differences by body size, patients with a known body mass index were grouped by that index ( <21; 21-25; and >25 kg/m(2)). For the PTV, all parameters were higher in the tomotherapy plans compared with the 5-field IMRT plans. For the rectum, V10 Gy and V60 Gy were higher, whereas V20 Gy and V30 Gy were lower in the tomotherapy plans. For the bladder, all parameters were higher in the tomotherapy plans. However, both plans were considered clinically acceptable. Similar trends were observed in 18 patients treated with tomotherapy. Obvious trends were not observed for body size. Tomotherapy provides equivalent dose distributions for PTVs and OARs compared with 18-MV 5-field IMRT. Tomotherapy could be used as a substitute for high-energy photon IMRT for prostate cancer regardless of body size.
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Affiliation(s)
- Akihiro Hayashi
- Department of Radiology, Nagoya City University Graduate school of Medical Science, Nagoya 467-8601, Japan Department of Radiology, Okazaki City Hospital, 3-1 Aza-Goshoai, Koryuzi-cho, Okazaki, Aichi 444-8553, Japan
| | - Yuta Shibamoto
- Department of Radiology, Nagoya City University Graduate school of Medical Science, Nagoya 467-8601, Japan
| | - Yukiko Hattori
- Department of Radiology, Nagoya City University Graduate school of Medical Science, Nagoya 467-8601, Japan Department of Radiation Oncology, Nagoya Proton Therapy Center, Nagoya City West Medical Center, 1-1-1 Hirate-cho, Kita-ku, Nagoya, Aichi 462-8508, Japan
| | - Takeshi Tamura
- Yokohama Cyberknife Center, Yokohama, Kanagawa 241-0014, Japan
| | - Michio Iwabuchi
- Department of Radiology, Nagoya City University Graduate school of Medical Science, Nagoya 467-8601, Japan Yokohama Cyberknife Center, Yokohama, Kanagawa 241-0014, Japan
| | - Shinya Otsuka
- Department of Radiology, Okazaki City Hospital, 3-1 Aza-Goshoai, Koryuzi-cho, Okazaki, Aichi 444-8553, Japan
| | - Chikao Sugie
- Department of Radiology, Nagoya City University Graduate school of Medical Science, Nagoya 467-8601, Japan
| | - Takeshi Yanagi
- Department of Radiology, Nagoya City University Graduate school of Medical Science, Nagoya 467-8601, Japan
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Dzierma Y, Bell K, Palm J, Nuesken F, Licht N, Rübe C. mARC vs. IMRT radiotherapy of the prostate with flat and flattening-filter-free beam energies. Radiat Oncol 2014; 9:250. [PMID: 25424536 PMCID: PMC4272773 DOI: 10.1186/s13014-014-0250-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Accepted: 11/04/2014] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND There as yet exists no systematic planning study investigating the novel mARC rotational radiotherapy technique, which is conceptually different from VMAT. We therefore present a planning study for prostate cancer, comparing mARC with IMRT treatment at the same linear accelerator equipped with flat and flattening-filter-free (FFF) photon energies. METHODS We retrospectively re-contoured and re-planned treatment plans for 10 consecutive prostate cancer patients. Plans were created for a Siemens Artiste linear accelerator with flat 6 MV and FFF 7 MV photons, using the Prowess Panther treatment planning system. mARC and IMRT plans were compared with each other considering indices for plan quality and dose to organs at risk. All plans were exported to the machine and irradiated while measuring scattered dose by thermoluminescent dosimeters placed on an anthropomorphic phantom. Treatment times were also measured and compared. RESULTS All plans were found acceptable for treatment. There was no marked preference for either technique or energy from the point of view of target coverage and dose to organs at risk. Scattered dose was significantly decreased by the use of FFF energies. While mARC and IMRT plans were of very similar overall quality, treatment time could be markedly decreased both by the use of mARC and FFF energy. CONCLUSIONS Highly conformal treatment plans could be created both by the use of flat 6 MV and FFF 7 MV energy, using IMRT or mARC. For all practical purposes, the FFF 7 MV energy and mARC plans are acceptable for treatment, a combination of both allowing a drastic reduction in treatment time from over 5 minutes to about half this value.
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Affiliation(s)
- Yvonne Dzierma
- Department of Radiotherapy, Saarland University Medical Center, Kirrberger Str. Geb. 6.5, 66421, Homburg, Germany.
| | - Katharina Bell
- Department of Radiotherapy, Saarland University Medical Center, Kirrberger Str. Geb. 6.5, 66421, Homburg, Germany.
| | - Jan Palm
- Department of Radiotherapy, Saarland University Medical Center, Kirrberger Str. Geb. 6.5, 66421, Homburg, Germany.
| | - Frank Nuesken
- Department of Radiotherapy, Saarland University Medical Center, Kirrberger Str. Geb. 6.5, 66421, Homburg, Germany.
| | - Norbert Licht
- Department of Radiotherapy, Saarland University Medical Center, Kirrberger Str. Geb. 6.5, 66421, Homburg, Germany.
| | - Christian Rübe
- Department of Radiotherapy, Saarland University Medical Center, Kirrberger Str. Geb. 6.5, 66421, Homburg, Germany.
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De Puysseleyr A, Van De Velde J, Speleers B, Vercauteren T, Goedgebeur A, Van Hoof T, Boterberg T, De Neve W, De Wagter C, Ost P. Hair-sparing whole brain radiotherapy with volumetric arc therapy in patients treated for brain metastases: dosimetric and clinical results of a phase II trial. Radiat Oncol 2014; 9:170. [PMID: 25074394 PMCID: PMC4118657 DOI: 10.1186/1748-717x-9-170] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Accepted: 07/18/2014] [Indexed: 11/24/2022] Open
Abstract
Purpose To report the dosimetric results and impact of volumetric arc therapy (VMAT) on temporary alopecia and hair-loss related quality of life (QOL) in whole brain radiotherapy (WBRT). Methods The potential of VMAT-WBRT to reduce the dose to the hair follicles was assessed. A human cadaver was treated with both VMAT-WBRT and conventional opposed field (OF) WBRT, while the subcutaneously absorbed dose was measured by radiochromic films and calculated by the planning system. The impact of these dose reductions on temporary alopecia was examined in a prospective phase II trial, with the mean score of hair loss at 1 month after VMAT-WBRT (EORTC-QOL BN20) as a primary endpoint and delivering a dose of 20 Gy in 5 fractions. An interim analysis was planned after including 10 patients to rule out futility, defined as a mean score of hair loss exceeding 56.7. A secondary endpoint was the global alopecia areata severity score measured with the “Severity of Alopecia Tool” (SALT) with a scale of 0 (no hair loss) to 100 (complete alopecia). Results For VMAT-WBRT, the cadaver measurements demonstrated a dose reduction to the hair follicle volume of 20.5% on average and of 41.8% on the frontal-vertex-occipital medial axis as compared to OF-WBRT. In the phase II trial, a total of 10 patients were included before the trial was halted due to futility. The EORTC BN20 hair loss score following WBRT was 95 (SD 12.6). The average median dose to the hair follicle volume was 12.6 Gy (SD 0.9), corresponding to a 37% dose reduction compared to the prescribed dose. This resulted in a mean SALT-score of 75. Conclusions Compared to OF-WBRT, VMAT-WBRT substantially reduces hair follicle dose. These dose reductions could not be related to an improved QOL or SALT score.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - Piet Ost
- Department of Radiotherapy and Experimental Cancer Research, Ghent University, De Pintelaan 185, Ghent, Belgium.
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Elith CA, Dempsey SE, Warren-Forward HM. Comparing four volumetric modulated arc therapy beam arrangements for the treatment of early-stage prostate cancer. J Med Radiat Sci 2014; 61:91-101. [PMID: 26229643 PMCID: PMC4175844 DOI: 10.1002/jmrs.52] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Revised: 04/03/2014] [Accepted: 04/04/2014] [Indexed: 11/21/2022] Open
Abstract
INTRODUCTION This study compared four different volumetric modulated arc therapy (VMAT) beam arrangements for the treatment of early-stage prostate cancer examining plan quality and the impact on a radiotherapy department's resources. METHODS Twenty prostate cases were retrospectively planned using four VMAT beam arrangements (1) a partial arc (PA), (2) one arc (1A), (3) one arc plus a partial arc (1A + PA) and (4) two arcs (2A). The quality of the dose distributions generated were compared by examining the overall plan quality, the homogeneity and conformity to the planning target volume (PTV), the number of monitor units and the dose delivered to the organs at risk. Departmental resources were considered by recording the planning time and beam delivery time. RESULTS Each technique produced a plan of similar quality that was considered adequate for treatment; though some differences were noted. The 1A, 1A + PA and 2A plans demonstrated a better conformity to the PTV which correlated to improved sparing of the rectum in the 60-70 Gy range for the 1A + PA and 2A techniques. The time needed to generate the plans was different for each technique ranging from 13.1 min for 1A + PA to 17.8 min for 1A. The PA beam delivery time was fastest with a mean time of 0.9 min. Beam-on times then increased with an increase in the number of arcs up to an average of 2.2 min for the 2A technique. CONCLUSION Which VMAT technique is best suited for clinical implementation for the treatment of prostate cancer may be dictated by the individual patient and the availability of departmental resources.
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Affiliation(s)
- Craig A Elith
- British Columbia Cancer Agency, Fraser Valley Centre Surrey, BC, Canada ; School of Health Sciences, University of Newcastle Callaghan, NSW, Australia
| | - Shane E Dempsey
- School of Health Sciences, University of Newcastle Callaghan, NSW, Australia
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Comparison of IMRT and VMAT plans with different energy levels using Monte-Carlo algorithm for prostate cancer. Jpn J Radiol 2014; 32:224-32. [PMID: 24510241 DOI: 10.1007/s11604-014-0291-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Accepted: 01/17/2014] [Indexed: 10/25/2022]
Abstract
PURPOSE To make dosimetric comparisons of volumetric-modulated arc therapy (VMAT) and 7-field intensity-modulated radiotherapy (IMRT) with dynamic MLCs using the Monaco treatment planning system with Monte Carlo algorithm. MATERIALS AND METHODS Single-arc VMAT and 7-field IMRT treatment plans were compared for 12 intermediate risk prostate cancer patients treated with prostate and seminal vesicle radiotherapy. For all patients, the prescribed dose was 78 Gy delivered in 39 fractions. The dosimetric data of IMRT and VMAT plans with 6, 10 and 15 MV energies were compared. The comparison was made for target volume, organs at risk (OAR) doses, and for monitor units (MU). RESULTS The normal tissue surrounding the target were lower in VMAT plans compared to IMRT plans. VMAT plans achieved lower doses to all OARs for nearly all dosimetric endpoints. VMAT plans achieved 9.4, 9.0 and 7.0 % relative decrease in MUs required for RT delivery, for 6, 10 and 15 MV energy levels, respectively. The target volume and OAR dosimetric values did not differ significantly between 6, 10 and 15 MV photon energies. CONCLUSION VMAT plans were found to be dosimetrically equivalent to IMRT plans for prostate cancer patients, with better rectum and bladder sparing and fewer MUs required.
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El-Saghire H, Vandevoorde C, Ost P, Monsieurs P, Michaux A, De Meerleer G, Baatout S, Thierens H. Intensity modulated radiotherapy induces pro-inflammatory and pro-survival responses in prostate cancer patients. Int J Oncol 2014; 44:1073-83. [PMID: 24435511 PMCID: PMC3977809 DOI: 10.3892/ijo.2014.2260] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 11/11/2013] [Indexed: 12/21/2022] Open
Abstract
Intensity modulated radiotherapy (IMRT) is one of the modern conformal radiotherapies that is widely used within the context of cancer patient treatment. It uses multiple radiation beams targeted to the tumor, however, large volumes of the body receive low doses of irradiation. Using γ-H2AX and global genome expression analysis, we studied the biological responses induced by low doses of ionizing radiation in prostate cancer patients following IMRT. By means of different bioinformatics analyses, we report that IMRT induced an inflammatory response via the induction of viral, adaptive, and innate immune signaling. In response to growth factors and immune-stimulatory signaling, positive regulation in the progression of cell cycle and DNA replication were induced. This denotes pro-inflammatory and pro-survival responses. Furthermore, double strand DNA breaks were induced in every patient 30 min after the treatment and remaining DNA repair and damage signaling continued after 18-24 h. Nine genes belonging to inflammatory responses (TLR3, SH2D1A and IL18), cell cycle progression (ORC4, SMC2 and CCDC99) and DNA damage and repair (RAD17, SMC6 and MRE11A) were confirmed by quantitative RT-PCR. This study emphasizes that the risk assessment of health effects from the out-of-field low doses during IMRT should be of concern, as these may increase the risk of secondary cancers and/or systemic inflammation.
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Affiliation(s)
- Houssein El-Saghire
- Radiobiology Unit, Molecular and Cellular Biology, Belgian Nuclear Research Centre (SCK·CEN), Mol, Belgium
| | | | - Piet Ost
- Department of Radiation Oncology, Ghent University Hospital, Gent, Belgium
| | - Pieter Monsieurs
- Radiobiology Unit, Molecular and Cellular Biology, Belgian Nuclear Research Centre (SCK·CEN), Mol, Belgium
| | - Arlette Michaux
- Radiobiology Unit, Molecular and Cellular Biology, Belgian Nuclear Research Centre (SCK·CEN), Mol, Belgium
| | - Gert De Meerleer
- Department of Radiation Oncology, Ghent University Hospital, Gent, Belgium
| | - Sarah Baatout
- Radiobiology Unit, Molecular and Cellular Biology, Belgian Nuclear Research Centre (SCK·CEN), Mol, Belgium
| | - Hubert Thierens
- Department of Basic Medical Sciences, Ghent University, Gent, Belgium
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The dosimetric effects of photon energy on the quality of prostate volumetric modulated arc therapy. Pract Radiat Oncol 2014; 4:e39-44. [DOI: 10.1016/j.prro.2013.03.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Revised: 03/01/2013] [Accepted: 03/04/2013] [Indexed: 11/18/2022]
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Interfractional variability in intensity-modulated radiotherapy of prostate cancer with or without thermoplastic pelvic immobilization. Strahlenther Onkol 2013; 190:94-9. [PMID: 24343757 DOI: 10.1007/s00066-013-0452-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Accepted: 08/05/2013] [Indexed: 10/26/2022]
Abstract
PURPOSE To determine the variability of patient positioning errors associated with intensity-modulated radiotherapy (IMRT) for prostate cancer and to assess the impact of thermoplastic pelvic immobilization on these errors using kilovoltage (kV) cone-beam computed tomography (CBCT). MATERIALS AND METHODS From February 2012 to June 2012, the records of 314 IMRT sessions in 19 patients with prostate cancer, performed with or without immobilization at two different facilities in the Korea University Hospital were analyzed. The kV CBCT images were matched to simulation computed tomography (CT) images to determine the simulation-to-treatment variability. The shifts along the x (lateral)-, y (longitudinal)- and z (vertical)-axes were measured, as was the shift in the three dimensional (3D) vector. RESULTS The measured systematic errors in the immobilized group during treatment were 0.46 ± 1.75 mm along the x-axis, - 0.35 ± 3.83 mm along the y-axis, 0.20 ± 2.75 mm along the z-axis and 4.05 ± 3.02 mm in the 3D vector. Those of nonimmobilized group were - 1.45 ± 7.50 mm along the x-axis, 1.89 ± 5.07 mm along the y-axis, 0.28 ± 3.81 mm along the z-axis and 8.90 ± 4.79 mm in the 3D vector. The group immobilized with pelvic thermoplastics showed reduced interfractional variability along the x- and y-axes and in the 3D vector compared to the nonimmobilized group (p < 0.05). CONCLUSION IMRT with thermoplastic pelvic immobilization in patients with prostate cancer appears to be useful in stabilizing interfractional variability during the planned treatment course.
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Cilla S, Deodato F, Digesù C, Macchia G, Picardi V, Ferro M, Sallustio G, De Spirito M, Piermattei A, Morganti AG. Assessing the feasibility of volumetric-modulated arc therapy using simultaneous integrated boost (SIB-VMAT): An analysis for complex head-neck, high-risk prostate and rectal cancer cases. Med Dosim 2013; 39:108-16. [PMID: 24342167 DOI: 10.1016/j.meddos.2013.11.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2013] [Revised: 10/02/2013] [Accepted: 11/11/2013] [Indexed: 10/25/2022]
Abstract
Intensity-modulated radiotherapy (IMRT) allowed the simultaneous delivery of different doses to different target volumes within a single fraction, an approach called simultaneous integrated boost (SIB). As consequence, the fraction dose to the boost volume can be increased while keeping low doses to the elective volumes, and the number of fractions and overall treatment time will be reduced, translating into better radiobiological effectiveness. In recent years, volumetric-modulated arc therapy (VMAT) has been shown to provide similar plan quality with respect to fixed-field IMRT but with large reduction in treatment time and monitor units (MUs) number. However, the feasibility of VMAT when used with SIB strategy has few investigations to date. We explored the potential of VMAT in a SIB strategy for complex cancer sites. A total of 15 patients were selected, including 5 head-and-neck, 5 high-risk prostate, and 5 rectal cancer cases. Both a double-arc VMAT and a 7-field IMRT plan were generated for each case using Oncentra MasterPlan treatment planning system for an Elekta Precise linac. Dosimetric indexes for targets and organs at risk (OARs) were compared based on dose-volume histograms. Conformity index, homogeneity index, and dose-contrast index were used for target analyses. The equivalent uniform doses and the normal tissue complication probabilities were calculated for main OARs. MUs number and treatment time were analyzed to score treatment efficiency. Pretreatment dosimetry was performed using 2-dimensional (2D)-array dosimeter. SIB-VMAT plans showed a high level of fluence modulation needed for SIB treatments, high conformal dose distribution, similar target coverage, and a tendency to improve OARs sparing compared with the benchmark SIB-IMRT plans. The median treatment times reduced from 13 to 20 minutes to approximately 5 minutes for all cases with SIB-VMAT, with a MUs reduction up to 22.5%. The 2D-array ion-chambers' measurements reported an agreement of more than 95% for a criterion of 3% to 3mm. SIB-VMAT was able to combine the advantages of conventional SIB-IMRT with its highly conformal dose distribution and OARs sparing and the advantages of 3D-conformal radiotherapy with its fast delivery.
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Affiliation(s)
- Savino Cilla
- Medical Physics Unit, Fondazione di ricerca e cura "Giovanni Paolo II," Università Cattolica del Sacro Cuore, Campobasso, Italy.
| | - Francesco Deodato
- Radiation Oncology Unit, Fondazione di ricerca e cura "Giovanni Paolo II," Università Cattolica del Sacro Cuore, Campobasso, Italy
| | - Cinzia Digesù
- Radiation Oncology Unit, Fondazione di ricerca e cura "Giovanni Paolo II," Università Cattolica del Sacro Cuore, Campobasso, Italy
| | - Gabriella Macchia
- Radiation Oncology Unit, Fondazione di ricerca e cura "Giovanni Paolo II," Università Cattolica del Sacro Cuore, Campobasso, Italy
| | - Vincenzo Picardi
- Radiation Oncology Unit, Fondazione di ricerca e cura "Giovanni Paolo II," Università Cattolica del Sacro Cuore, Campobasso, Italy
| | - Marica Ferro
- Radiation Oncology Unit, Fondazione di ricerca e cura "Giovanni Paolo II," Università Cattolica del Sacro Cuore, Campobasso, Italy
| | - Giuseppina Sallustio
- Radiology Unit, Fondazione di ricerca e cura "Giovanni Paolo II," Università Cattolica del Sacro Cuore, Campobasso, Italy
| | - Marco De Spirito
- Physics Institute, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Angelo Piermattei
- Physics Institute, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Alessio G Morganti
- Radiation Oncology Unit, Fondazione di ricerca e cura "Giovanni Paolo II," Università Cattolica del Sacro Cuore, Campobasso, Italy
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Onal C, Sonmez S, Erbay G, Guler OC, Arslan G. Simultaneous integrated boost to intraprostatic lesions using different energy levels of intensity-modulated radiotherapy and volumetric-arc therapy. Br J Radiol 2013; 87:20130617. [PMID: 24319009 DOI: 10.1259/bjr.20130617] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
OBJECTIVE This study compared the dosimetry of volumetric-arc therapy (VMAT) and intensity-modulated radiotherapy (IMRT) with a dynamic multileaf collimator using the Monte Carlo algorithm in the treatment of prostate cancer with and without simultaneous integrated boost (SIB) at different energy levels. METHODS The data of 15 biopsy-proven prostate cancer patients were evaluated. The prescribed dose was 78 Gy to the planning target volume (PTV78) including the prostate and seminal vesicles and 86 Gy (PTV86) in 39 fractions to the intraprostatic lesion, which was delineated by MRI or MR-spectroscopy. RESULTS PTV dose homogeneity was better for IMRT than VMAT at all energy levels for both PTV78 and PTV86. Lower rectum doses (V30-V50) were significantly higher with SIB compared with PTV78 plans in both IMRT and VMAT plans at all energy levels. The bladder doses at high dose level (V60-V80) were significantly higher in IMRT plans with SIB at all energy levels compared with PTV78 plans, but no significant difference was observed in VMAT plans. VMAT plans resulted in a significant decrease in the mean monitor units (MUs) for 6, 10, and 15 MV energy levels both in plans with and those without SIB. CONCLUSION Dose escalation to intraprostatic lesions with 86 Gy is safe without causing serious increase in organs at risk (OARs) doses. VMAT is advantageous in sparing OARs and requiring less MU than IMRT. ADVANCES IN KNOWLEDGE VMAT with SIB to intraprostatic lesion is a feasible method in treating prostate cancer. Additionally, no dosimetric advantage of higher energy is observed.
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Affiliation(s)
- C Onal
- Department of Radiation Oncology, Baskent University Faculty of Medicine, Adana, Turkey
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Mason J, Al-Qaisieh B, Bownes P, Wilson D, Buckley DL, Thwaites D, Carey B, Henry A. Multi-parametric MRI-guided focal tumor boost using HDR prostate brachytherapy: a feasibility study. Brachytherapy 2013; 13:137-45. [PMID: 24268487 DOI: 10.1016/j.brachy.2013.10.011] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Revised: 09/25/2013] [Accepted: 10/18/2013] [Indexed: 10/26/2022]
Abstract
PURPOSE This study investigates the feasibility of delivering focal boost dose to tumor regions, identified with multi-parametric MRI, in high-dose-rate prostate brachytherapy. METHODS AND MATERIALS T2-weighted, diffusion-weighted, and dynamic-contrast-enhanced MRI were acquired the day before treatment and analyzed retrospectively for 15 patients. Twelve patients had hormone therapy before the MRI scan. The tumor was delineated on MRI by a radiologist and registered to treatment planning transrectal ultrasound images. A margin based on analysis of delineation and registration uncertainties was applied to create a focal boost planning target volume (F-PTV). Delivered treatment plans were compared with focal boost plans optimized to increase F-PTV dose as much as allowed by urethral and rectal dose constraints. RESULTS Tumors were delineated in all patients with volumes 0.4-23.0cc. The margin for tumor delineation and image registration uncertainties was estimated to be 4.5 mm. For F-PTV, the focal boost treatment plans increased median D90 from 17.6 to 20.9 Gy and median V150 from 27.3% to 75.9%. CONCLUSIONS MRI-guided high-dose-rate prostate brachytherapy focal tumor boost is feasible-tumor regions can be identified even after hormone therapy, and focal boost dose can be delivered without violating urethral and rectal dose constraints.
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Affiliation(s)
- Josh Mason
- Medical Physics, St James's Institute of Oncology, Leeds Teaching Hospitals NHS Trust; Division of Medical Physics, University of Leeds.
| | - Bashar Al-Qaisieh
- Medical Physics, St James's Institute of Oncology, Leeds Teaching Hospitals NHS Trust
| | - Peter Bownes
- Medical Physics, St James's Institute of Oncology, Leeds Teaching Hospitals NHS Trust
| | - Dan Wilson
- Medical Physics, St James's Institute of Oncology, Leeds Teaching Hospitals NHS Trust
| | | | - David Thwaites
- Division of Medical Physics, University of Leeds; Institute of Medical Physics, School of Physics, University of Sydney, Australia
| | - Brendan Carey
- Radiology, St James's Institute of Oncology, Leeds Teaching Hospitals NHS Trust
| | - Ann Henry
- Clinical Oncology, St James's Institute of Oncology, Leeds Teaching Hospitals NHS Trust
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Biological optimization of simultaneous boost on intra-prostatic lesions (DILs): Sensitivity to TCP parameters. Phys Med 2013; 29:592-8. [DOI: 10.1016/j.ejmp.2012.10.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Revised: 10/01/2012] [Accepted: 10/04/2012] [Indexed: 11/20/2022] Open
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La Radioterapia Nel Trattamento Del Carcinoma Della Prostata: Indicazioni, Evoluzione Tecnologica e Approcci Integrati. Urologia 2013; 80:188-201. [DOI: 10.5301/ru.2013.11499] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/01/2013] [Indexed: 11/20/2022]
Abstract
Prostate cancer is a heterogeneous, indolent or sometimes aggressive tumor. Treatment options are various and without proved superiority. Radiotherapy (RT) plays a key role in the disease history. Technological evolution with Intensity Modulate Radiation Therapy (IMRT) and Image Guided Radiation Therapy (IGRT) allowed improvement, with significant results on local control and survival. Hypofractionation, Stereotactic Body RT (SBRT) and new brachytherapy approachs are still under investigation, with promising opportunities. Adjuvant vs salvage postoperative RT, hormone association, prophylactic pelvic irradiation are still under debate, but guidelines express overlapping indications. Multidisciplinary managements will be the future for care optimization, providing the best tool for holistic and informed patients' choice.
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Yang Y, Ford EC, Wu B, Pinkawa M, van Triest B, Campbell P, Song DY, McNutt TR. An overlap-volume-histogram based method for rectal dose prediction and automated treatment planning in the external beam prostate radiotherapy following hydrogel injection. Med Phys 2013; 40:011709. [PMID: 23298079 DOI: 10.1118/1.4769424] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
PURPOSE Hydrogel injected between the rectum and prostate prior to radiotherapy provides a possible means of increased dose sparing to the rectum. Here the authors evaluate the overlap volume histogram (OVH) metric as a means to predict the rectal dose following hydrogel injection. Whether OVH predicted dose can serve as the dose objective or constraint for automated treatment planning was also investigated. METHODS Treatment planning was performed on 21 prostate cancer patients both pre- and posthydrogel injection, with five-field IMRT delivering 78 Gy to the planning target volume (PTV). The authors quantify the geometrical relationship between the rectum and the prostate PTV using an OVH metric which determines the fractional volume of the rectum that is within a specified distance of the PTV. For an OVH distance the authors selected, L(20), the PTV expansion distance at which 20% of the rectum overlaps. The authors calculated the rectal dose, D(20), received by 20% of the rectum volume on the dose volume histogram. Linear regression was used to examine the correlation between the L(20) and D(20), and between ΔL(20) and ΔD(20) (i.e., the change of L(20) and D(20) posthydrogel injection). Additionally, rectal dose D(15), D(25), D(35), D(50), and bladder dose D(15) were predicted from the OVH (L(15), L(25), L(35), L(50), for rectum and L(15) for bladder) by the L(x)-D(x) linear regression. The predicted doses were applied to the objectives for automated treatment planning of ten plans from five patients. Automatically generated plans were compared with plans manually generated on trial-and-error basis. RESULTS The rectal L(20) was increased and dose D(20) decreased due to the enlarged separation of rectum caused by the hydrogel injection. Linear regression showed an inverse linear correlation between L(20) and D(20), and between ΔL(20) and ΔD(20) (r(2) = 0.77, 0.60, respectively; p < 0.0001). The increase in rectal sparing (ΔD(20)) is only weakly correlated with the volume of injected hydrogel (r(2) = 0.17; p = 0.07), indicating OVH is a more predictive indicator of rectal sparing than the volume of hydrogel itself. Application of the predicted rectum and bladder doses to automated planning produced acceptable treatment plans, with rectal dose reduced for eight of ten plans. CONCLUSIONS The OVH metric can predict the rectal dose in the external beam prostate radiotherapy for patients with hydrogel injection. The predicted doses can be applied to the objectives of optimization in automated treatment planning to produce acceptable treatment plans.
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Affiliation(s)
- Yidong Yang
- Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University, Baltimore, MD, USA.
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