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https://www.readbyqxmd.com/read/28636530/gamma-analysis-with-a-gamma-criterion-of-2-1-mm-for-stereotactic-ablative-radiotherapy-delivered-with-volumetric-modulated-arc-therapy-technique-a-single-institution-experience
#1
Jung-In Kim, Minsoo Chun, Hong-Gyun Wu, Eui Kyu Chie, Hak Jae Kim, Jin Ho Kim, Jong Min Park
To report a single-institution experience of gamma evaluations with 2%/1 mm for stereotactic ablative radiotherapy (SABR) delivered with volumetric modulated arc therapy (VMAT) technique, from January 2014 to January 2016. A total of 168 SABR VMAT plans were analyzed with a gamma criterion of 2%/1 mm, a threshold value of 10%, and a tolerance level of 90%. Of the 168 cases, four cases failed with 2%/1 mm. The average passing rate was 97.0% ± 2.5%. Three of the four failed cases showed passing rates higher than 90%, which was achieved by shifting the measuring device by 1 mm in the left-to-right or anterior-to-posterior directions...
June 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28619290/sparing-dysphagia-aspiration-related-structures-using-novel-hybrid-volumetric-modulated-arc-therapy
#2
Sitaraman BalajiSubramanian, Karunakaran Balaji, Moorthi Thirunavukarasu, Sumana Premkumar
PURPOSE: Studies using split field IMRT to spare dysphagia/aspiration related structures (DARS) have raised concern regarding dose uncertainty at matchline. This study explores the utility of hybrid VMAT in sparing the DARS and assesses matchline dose uncertainty in postoperative oral cavity cancer patients and compares it with VMAT. METHODS & MATERIALS: Ten postoperative oral cavity cancer patients were planned with h-VMAT and VMAT using the same planning CT dataset...
June 12, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28611367/the-hippocampus-sparing-volume-modulated-arc-therapy-does-not-influence-plan-quality-on-locally-advanced-nasopharyngeal-carcinoma-patients
#3
Wendong Gu, Qilin Li, Dan Xi, Ye Tian, Juncong Mo, Honglei Pei
Irradiation on hippocampus would lead to neuro-cognitive dysfunction in locally advanced nasopharyneal carcinoma (LA-NPC) patients accepting radiotherapy. Our study here aimed to investigate if undergoing hippocampus sparing (HS) volume modulated arc therapy (VMAT) would influence the plan quality in LA NPC patients. We designed three kinds of radiotherapeutic plans for 11 LA NPC patients: conventional VMAT (C-VMAT), HS-VMAT and HS intensity modulated radiation therapy with dynamic multileaf collimator (HS-dMLC)...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28608296/erratum-to-short-tangential-arcs-in-vmat-based-breast-and-chest-wall-radiotherapy-lead-to-conformity-of-the-breast-dose-with-lesser-cardiac-and-lung-doses-a-prospective-study-of-breast-conservation-and-mastectomy-patients
#4
Anusheel Munshi, Biplab Sarkar, Satheeshkumar Anbazhagan, Upendra K Giri, Harpreet Kaur, Kanan Jassal, Tharmar Ganesh, Bidhu Kalyan Mohanti
No abstract text is available yet for this article.
June 12, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28597229/couch-modelling-for-volumetric-modulated-arc-therapy-vmat
#5
Te-Yu Chyou, Friedlieb Lorenz
The aim of this work was to investigate the impact of the accuracy of a certain couch model on the overall accuracy of the dose calculation. For this purpose two models of the Varian Exact Couch (Varian Medical Systems, Palo Alto, CA, USA) for use in the planning of volumetric modulated arc therapy (VMAT) were created in Monaco 5.1 (Elekta, Stockholm, Sweden). The first was a simplistic model, with the relative electron densities (ED) of structures based entirely on CT Hounsfield units (HU). The second couch model was obtained by assigning the appropriate EDs to the relevant couch structures...
June 8, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28596803/volumetric-arc-therapy-for-total-scalp-irradiation-case-report-for-a-recurrent-basal-cell-carcinoma-of-the-scalp
#6
Francisco Lozano, Naipy Perez, Alejandro Iglesias, Xiaodong Xu, Marco A Amendola, Michael Scott, Erich Companioni, Beatriz E Amendola
Total scalp irradiation may be used to treat numerous conditions including squamous and basal cell carcinomas. These conditions are relatively uncommon and patients are frequently treated with palliative intent. In this report, we describe a volumetric arc therapy technique using photon beams for curative intent in an 84 years old patient with recurrent basal cell carcinoma of the scalp. Dose was 50Gy (2Gy per session) to the planning target volume (PTV) followed by a 10 Gy boost to the macroscopic disease on the forehead...
2017: Ecancermedicalscience
https://www.readbyqxmd.com/read/28594461/evaluation-of-a-composite-gel-alanine-phantom-on-an-end-to-end-test-to-treat-multiple-brain-metastases-by-a-single-isocenter-vmat-technique
#7
Juliana Fernandes Pavoni, Wellington Furtado Pimenta Neves, Matheus Antonio da Silveira, Cecília Maria Kalil Haddad, Oswaldo Baffa
PURPOSE: This work aims to evaluate the application of a cylindrical phantom made of dosimetric gel containing alanine pellets distributed inside the gel volume during an end-to-end test of a single isocenter VMAT for simultaneous treatment of multiple brain metastases. The evaluation is based on the comparison of the results obtained with the composite phantom with the treatment planning system (TPS) dose distribution validated by using the clinical conventional quality control with point and planar dose measurements...
June 8, 2017: Medical Physics
https://www.readbyqxmd.com/read/28585300/investigation-of-error-detection-capabilities-of-phantom-epid-and-mlc-log-file-based-imrt-qa-methods
#8
Dewayne L Defoor, Sotirios Stathakis, Joseph E Roring, Neil A Kirby, Panayiotis Mavroidis, Mohammad Obeidat, Nikos Papanikolaou
A patient specific quality assurance (QA) should detect errors that originate anywhere in the treatment planning process. However, the increasing complexity of treatment plans has increased the need for improvements in the accuracy of the patient specific pretreatment verification process. This has led to the utilization of higher resolution QA methods such as the electronic portal imaging device (EPID) as well as MLC log files and it is important to know the types of errors that can be detected with these methods...
June 6, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28579017/whole-breast-nodal-irradiation-using-supine-vmat-and-prone-3d-planning-a-case-study
#9
Ashley Coffey, Lisa Renucci, Ashley Hunzeker, Nishele Lenards
The purpose of this study was to compare the variations in doses to the ipsilateral lung and heart between the supine whole breast and nodal volumetric-modulated arc therapy (VMAT) technique and the prone 3-dimensional conformal radiation therapy (3DCRT) technique. In this study, 3 patients who were simulated in the prone and supine positions were planned using supine VMAT and prone 3DCRT techniques to compare planning target volume (PTV) coverage as well as dose to organs at risk (ORs), including the heart and ipsilateral lung...
May 31, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28574219/optimization-of-the-dosimetric-leaf-gap-for-use-in-planning-vmat-treatments-of-spine-sabr-cases
#10
Nigel D Middlebrook, Bess Sutherland, Tanya Kairn
The dosimetric leaf gap (DLG) is a beam configuration parameter used in the Varian Eclipse treatment planning system, to model the effects of rounded MLC leaf ends. Measuring the DLG using the conventional sliding-slit technique has been shown to be produce questionable results for some volumetric modulated arc therapy (VMAT) treatments. This study therefore investigated the use of radiochromic film measurements to optimize the DLG specifically for the purpose of producing accurate VMAT plans using a flattening-filter-free (FFF) beam, for use in treating vertebral targets using a stereotactic (SABR, also known as SBRT) fractionation schedule...
June 2, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28574192/feasibility-study-of-ultrasound-imaging-for-stereotactic-body-radiation-therapy-with-active-breathing-coordinator-in-pancreatic-cancer
#11
Lin Su, Iulian Iordachita, Yin Zhang, Junghoon Lee, Sook Kien Ng, Juan Jackson, Ted Hooker, John Wong, Joseph M Herman, H Tutkun Sen, Peter Kazanzides, Muyinatu A Lediju Bell, Chen Yang, Kai Ding
PURPOSE: Stereotactic body radiation therapy (SBRT) allows for high radiation doses to be delivered to the pancreatic tumors with limited toxicity. Nevertheless, the respiratory motion of the pancreas introduces major uncertainty during SBRT. Ultrasound imaging is a non-ionizing, non-invasive, and real-time technique for intrafraction monitoring. A configuration is not available to place the ultrasound probe during pancreas SBRT for monitoring. METHODS AND MATERIALS: An arm-bridge system was designed and built...
June 2, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28574131/surprising-complete-response-of-intramedullary-spinal-cord-metastasis-from-breast-cancer-a-case-report-and-literature-review
#12
Dario Aiello, Rosario Mazzola, Fabiana Gregucci, Francesco Ricchetti, Niccolò Giaj Levra, Luigi Romano, Giovanni Carbognin, Matteo Salgarello, Alberto Beltramello, Filippo Alongi
PURPOSE: Intramedullary spinal cord metastases (ISCM) are considered rare but their incidence is rising. Most ISCM cases are recognized to occur in patients with stage IV lung cancer or breast cancer (BC). METHODS: We report a rare case of cervical BC-ISCM in 60-year-old woman, documented by magnetic resonance imaging and positron emission tomography-computed tomography and treated with volumetric modulated arc therapy with daily image-guided radiation therapy (VMAT/IGRT)...
May 29, 2017: Tumori
https://www.readbyqxmd.com/read/28564208/commissioning-and-quality-assurance-for-vmat-delivery-systems-an-efficient-time-resolved-system-using-real-time-epid-imaging
#13
Benjamin J Zwan, Michael P Barnes, Jonathan Hindmarsh, Seng B Lim, Dale M Lovelock, Todsaporn Fuangrod, Daryl J O'Connor, Paul J Keall, Peter B Greer
PURPOSE: An ideal commissioning and quality assurance (QA) program for Volumetric Modulated Arc Therapy (VMAT) delivery systems should assess the performance of each individual dynamic component as a function of gantry angle. Procedures within such a program should also be time-efficient, independent of the delivery system and be sensitive to all types of errors. The purpose of this work is to develop a system for automated time-resolved commissioning and QA of VMAT control systems which meets these criteria...
May 31, 2017: Medical Physics
https://www.readbyqxmd.com/read/28557310/larynx-motion-considerations-in-partial-larynx-volumetric-modulated-arc-therapy-for-early-glottic-cancer
#14
Houda Bahig, Phuc Félix Nguyen-Tan, Édith Filion, David Roberge, Pensavan Thanomsack, Jacques de Guise, Danis Blais, Robert Doucet, Laurent Létourneau-Guillon, Louise Lambert
INTRODUCTION: To assess laryngeal motion in early glottic cancer in order to determine safe margins for partial larynx volumetric modulated arc therapy (PL-VMAT), and to quantify dosimetric advantages of PL-VMAT. METHODS: This prospective study included T1-2N0 glottic cancers treated with whole larynx VMAT (WL-VMAT). Pre- and mid-treatment 4D-computed tomography (4D-CT) and dynamic magnetic resonance imaging (MRI) allowed for assessment of larynx swallowing and respiratory motion...
May 30, 2017: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/28549556/evaluation-of-a-commercial-automatic-treatment-planning-system-for-prostate-cancers
#15
Kanabu Nawa, Akihiro Haga, Akihiro Nomoto, Raniel A Sarmiento, Kenshiro Shiraishi, Hideomi Yamashita, Keiichi Nakagawa
Recent developments in Radiation Oncology treatment planning have led to the development of software packages that facilitate automated intensity-modulated radiation therapy (IMRT) and volumetric-modulated arc therapy (VMAT) planning. Such solutions include site-specific modules, plan library methods, and algorithm-based methods. In this study, the plan quality for prostate cancer generated by the Auto-Planning module of the Pinnacle(3) radiation therapy treatment planning system (v9.10, Fitchburg, WI) is retrospectively evaluated...
May 23, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28535915/virtual-patient-3d-dose-reconstruction-using-in-air-epid-measurements-and-a-back-projection-algorithm-for-imrt-and-vmat-treatments
#16
Igor Olaciregui-Ruiz, Roel Rozendaal, René F M van Oers, Ben Mijnheer, Anton Mans
PURPOSE: At our institute, a transit back-projection algorithm is used clinically to reconstruct in vivo patient and in phantom 3D dose distributions using EPID measurements behind a patient or a polystyrene slab phantom, respectively. In this study, an extension to this algorithm is presented whereby in air EPID measurements are used in combination with CT data to reconstruct 'virtual' 3D dose distributions. By combining virtual and in vivo patient verification data for the same treatment, patient-related errors can be separated from machine, planning and model errors...
May 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28529896/advances-in-radiotherapy-techniques-and-delivery-for-non-small-cell-lung-cancer-benefits-of-intensity-modulated-radiation-therapy-proton-therapy-and-stereotactic-body-radiation-therapy
#17
REVIEW
Tejan P Diwanji, Pranshu Mohindra, Melissa Vyfhuis, James W Snider, Chaitanya Kalavagunta, Sina Mossahebi, Jen Yu, Steven Feigenberg, Shahed N Badiyan
The 21st century has seen several paradigm shifts in the treatment of non-small cell lung cancer (NSCLC) in early-stage inoperable disease, definitive locally advanced disease, and the postoperative setting. A key driver in improvement of local disease control has been the significant evolution of radiation therapy techniques in the last three decades, allowing for delivery of definitive radiation doses while limiting exposure of normal tissues. For patients with locally-advanced NSCLC, the advent of volumetric imaging techniques has allowed a shift from 2-dimensional approaches to 3-dimensional conformal radiation therapy (3DCRT)...
April 2017: Translational Lung Cancer Research
https://www.readbyqxmd.com/read/28529250/impact-of-jaw-position-accuracy-on-dose-variation-in-volumetric-modulated-arc-therapy-using-jaw-tracking
#18
Fumiyasu Matsubayashi, Yuki Koizumi, Ryo Takahashi, Minoru Yoshioka, Tomoharu Sato
The technique of jaw tracking can be used in volumetric modulated arc therapy (VMAT) and intensity modulated radiation therapy (IMRT). In this technique, jaw tracks apertures of the multi leaf collimator (MLC) during irradiation. It is reported that dose variation is occurred by the changing accuracy of MLC position in VMAT and IMRT. Though jaw moves dynamically in the irradiation by using this technique, the influence of the jaw position accuracy on dose variation is not examined. The purpose of this study is to verify the influence of jaw position accuracy on dose variation in VMAT using jaw tracking...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28524822/simultaneous-delivery-time-and-aperture-shape-optimization-for-the-volumetric-modulated-arc-therapy-vmat-treatment-planning-problem
#19
Mehdi Mahnam, Michel Gendreau, Nadia Lahrichi, Louis-Martin Rousseau
In this paper, we propose a novel heuristic algorithm for the volumetric modulated arc therapy (VMAT) treatment planning problem, optimizing the trade-off between delivery time and treatment quality. We present a new mixed integer programming model in which the multi-leaf collimator leaf positions, gantry speed, and dose rate are determined simultaneously. Our heuristic is based on column generation; the aperture conguration is modeled in the columns and the dose distribution and time restriction in the rows...
May 19, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28523470/short-tangential-arcs-in-vmat-based-breast-and-chest-wall-radiotherapy-lead-to-conformity-of-the-breast-dose-with-lesser-cardiac-and-lung-doses-a-prospective-study-of-breast-conservation-and-mastectomy-patients
#20
Anusheel Munshi, Biplab Sarkar, Anbu Sateeshkumar, Upendra K Giri, Harpreet Kaur, Kanan Jassal, Tharmar Ganesh, Bidhu Kalyan Mohanti
Volumetric modulated arc therapy (VMAT) is modern rotational intensity modulated therapy used for treatment of several sites. The study aimed to analyze partial tangential arc VMAT treatment planning and delivery, including analyzing the cardiac and contralateral breast doses resulting from this technique. A total of 153 consecutively treated breast cancer (conservation as well as mastectomy) patients were taken for this dosimetric study. All patients were planned using partial arc VMAT in the Monaco treatment planning system using two partial arc beams...
May 18, 2017: Australasian Physical & Engineering Sciences in Medicine
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