keyword
MENU ▼
Read by QxMD icon Read
search

Vmat

keyword
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
#1
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
#2
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
#3
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
#4
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
#5
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
https://www.readbyqxmd.com/read/28521451/dosimetric-comparison-of-intensity-modulated-radiation-therapy-and-volumetric-modulated-arc-therapy-plans-for-the-treatment-of-glioma-using-flattening-filter-free-and-flattening-filter-modes
#6
Dandan Xu, Fei Jia, Guowen Li, Hongfei Li
In the present study, the dose verification between 6X and 6X flattening filter-free (FFF) in intensity-modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) was compared, and the advantages and disadvantages of different radiotherapy plans were evaluated. All four plans achieved comparable heterogeneity and conformity indices. For frontal tumor, VMAT demonstrated more improved sparing of the brainstem compared with the IMRT (P=0.045); while in the model of FFF, the Dmax of eye lens was significantly reduced by 16-21% (P<0...
May 2017: Oncology Letters
https://www.readbyqxmd.com/read/28521403/comparative-study-on-dosimetry-of-vmat-and-imrt-in-assisted-radiotherapy-after-radical-resection-of-rectal-cancer
#7
Jianguo Shi, Fujun Yang, Xiangbai Ju, Yudong Huang, Fenge Jiang
The present study compared the dosimetric differences of volumetric modulated arc therapy (VMAT) and 7-field intensity modulated radiation therapy technology (7F-IMRT) in assisted radiotherapy plan after resection of rectal carcinoma. Ten cases of patients at stages II-III of rectal cancer transabdominal resection with postoperative pelvic radiotherapy underwent 7F-IMRT and VMAT radiotherapy plan design using the CMS Monaco treatment planning system. We compared the dose distribution, the number of organs at risk and the number of machines in the two groups...
May 2017: Oncology Letters
https://www.readbyqxmd.com/read/28508846/assessment-of-three-dimensional-setup-errors-in-image-guided-pelvic-radiotherapy-for-uterine-and-cervical-cancer-using-kilovoltage-cone-beam-computed-tomography-and-its-effect-on-planning-target-volume-margins
#8
Nidhi Patni, Nagarjuna Burela, Rajesh Pasricha, Jaishree Goyal, Tej Prakash Soni, T Senthil Kumar, T Natarajan
PURPOSE: To achieve the best possible therapeutic ratio using high-precision techniques (image-guided radiation therapy/volumetric modulated arc therapy [IGRT/VMAT]) of external beam radiation therapy in cases of carcinoma cervix using kilovoltage cone-beam computed tomography (kV-CBCT). MATERIALS AND METHODS: One hundred and five patients of gynecological malignancies who were treated with IGRT (IGRT/VMAT) were included in the study. CBCT was done once a week for intensity-modulated radiation therapy and daily in IGRT/VMAT...
January 2017: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28508845/dosimetric-comparison-of-head-and-neck-cancer-patients-planned-with-multivendor-volumetric-modulated-arc-therapy-technology
#9
Murugesan Kathirvel, Vellaiyan Subramani, V S Subramanian, Shanmugam Thirumalai Swamy, Gandhi Arun, Subramanian Kala
AIM: Purpose of this study is to dosimetrically compare head and neck (H and N) cancer patients planned with multivendor volumetric modulated arc therapy (VMAT) technology. VMAT treatment planning can be done using biological (treatment planning system [TPSB]: Monaco) or physical (TPSP: Eclipse)-based cost function optimization techniques. Planning and dosimetric comparisons were done in both techniques for H and N cases. MATERIALS AND METHODS: Twenty H and N patients were retrospectively selected for this study...
January 2017: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28503916/exploratory-study-of-the-association-of-volumetric-modulated-arc-therapy-vmat-plan-robustness-with-local-failure-in-head-and-neck-cancer
#10
Wei Liu, Samir H Patel, Daniel P Harrington, Yanle Hu, Xiaoning Ding, Jiajian Shen, Michele Y Halyard, Steven E Schild, William W Wong, Gary E Ezzell, Martin Bues
This work is to show which is more relevant to cause local failures (LFs) due to patient setup uncertainty between the planning target volume (PTV) underdosage and the potential target underdosage subject to patient setup uncertainties in head and neck (H&N) cancer treated with volumetric-modulated arc therapy (VMAT). Thirteen LFs in 10 H&N patients treated by VMAT were analyzed. Measures have been taken to minimize the chances of insufficient target delineation for these patients and the patients were clinically determined to have LF based on the PET/CT scan results by an experienced radiologist and then reviewed by a second experienced radiation oncologist...
May 14, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28502472/a-novel-concept-for-tumour-targeting-with-radiation-inverse-dose-painting-or-targeting-the-low-drug-uptake-volume
#11
Ala Yaromina, Marlies Granzier, Rianne Biemans, Natasja Lieuwes, Wouter van Elmpt, Georgy Shakirin, Ludwig Dubois, Philippe Lambin
BACKGROUND AND PURPOSE: We tested a novel treatment approach combining (1) targeting radioresistant hypoxic tumour cells with the hypoxia-activated prodrug TH-302 and (2) inverse radiation dose-painting to boost selectively non-hypoxic tumour sub-volumes having no/low drug uptake. MATERIAL AND METHODS: (18)F-HX4 hypoxia tracer uptake measured with a clinical PET/CT scanner was used as a surrogate of TH-302 activity in rhabdomyosarcomas growing in immunocompetent rats...
May 11, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28493940/monte-carlo-simulation-for-scanning-technique-with-scattering-foil-free-electron-beam-a-proof-of-concept-study
#12
Wonmo Sung, Jong In Park, Jung-In Kim, Joel Carlson, Sung-Joon Ye, Jong Min Park
This study investigated the potential of a newly proposed scattering foil free (SFF) electron beam scanning technique for the treatment of skin cancer on the irregular patient surfaces using Monte Carlo (MC) simulation. After benchmarking of the MC simulations, we removed the scattering foil to generate SFF electron beams. Cylindrical and spherical phantoms with 1 cm boluses were generated and the target volume was defined from the surface to 5 mm depth. The SFF scanning technique with 6 MeV electrons was simulated using those phantoms...
2017: PloS One
https://www.readbyqxmd.com/read/28490985/imaged-guided-liver-stereotactic-body-radiotherapy-using-vmat-and-real-time-adaptive-tumor-gating-concerns-about-technique-and-preliminary-clinical-results
#13
Carmen Llacer-Moscardo, Olivier Riou, David Azria, Ludovic Bedos, Norbert Ailleres, Francois Quenet, Philippe Rouanet, Marc Ychou, Pascal Fenoglietto
BACKGROUND: Motion management is a major challenge in abdominal SBRT. We present our study of SBRT for liver tumors using intrafraction motion review (IMR) allowing simultaneous KV information and MV delivery to synchronize the beam during gated RapidArc treatment. MATERIALS AND METHODS: Between May 2012 and March 2015, 41 patients were treated by liver SBRT using gated RapidArc technique in a Varian Novalis Truebeam STx linear accelerator. PTV was created by expanding 5 mm from the ITV...
March 2017: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/28490984/evaluation-of-reproducibility-of-tumor-repositioning-during-multiple-breathing-cycles-for-liver-stereotactic-body-radiotherapy-treatment
#14
Ludovic Bedos, Olivier Riou, Norbert Aillères, Antoine Braccini, Jessica Molinier, Carmen Llacer Moscardo, David Azria, Pascal Fenoglietto
AIM: To evaluate the tumor repositioning during gated volumetric modulated arc therapy (VMAT) for liver stereotactic body radiotherapy(SBRT) treatment using implanted fiducial markers and intrafraction kilovoltage (kV) images acquired during dose delivery. MATERIALS AND METHODS: Since 2012, 47 liver cancer patients with implanted fiducial markers were treated using the gated VMAT technique with a Varian Truebeam STx linear accelerator. The fiducial markers were implanted inside or close to the tumor target before treatment simulation...
March 2017: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/28490982/radiosurgery-for-liver-metastases-a-single-institution-experience
#15
Beatriz Amendola, Marco Amendola, Jesús M Blanco, Naipy Perez, Xiaodong Wu
AIM: To report our initial results on the use of radiosurgery for treatment of liver metastases. BACKGROUND: In recent years there has been increasing interest in the use of stereotactic body radiation therapy to treat metastatic disease to the liver as an alternative to interventional procedures. MATERIALS AND METHODS: Between November 2008 and June 2015 a total of 36 LINAC-based radiosurgeries using VMAT were performed in 27 patients with liver metastases from 10 different primary sites...
March 2017: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/28490344/dosimetric-advantage-of-volumetric-modulated-arc-therapy-in-the-treatment-of-intraocular-cancer
#16
Zhenxiang Deng, Lanxiao Shen, Xiaomin Zheng, Yongqiang Zhou, Jinling Yi, Ce Han, Congying Xie, Xiance Jin
OBJECTIVE: The purpose of this study is to investigate the dosimetric advantages of volumetric modulated arc therapy (VMAT) in the treatment of intraocular cancer by comparing it directly with three-dimensional conformal radiotherapy (CRT) and intensity-modulated radiotherapy (IMRT). METHODS: CRT plan, 7f-IMRT plan, and one-arc VMAT plan were generated for 14 intraocular cancer patients. Dosimetric and biological quality indices for target volume and organs at risks (OARs) were evaluated and compared...
May 10, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28486217/fully-automated-treatment-planning-for-head-and-neck-radiotherapy-using-a-voxel-based-dose-prediction-and-dose-mimicking-method
#17
Chris McIntosh, Mattea Welch, Andrea McNiven, David Jaffray, Thomas Purdie
Recent works in automated radiotherapy treatment planning have used machine learning based on historical treatment plans to infer the spatial dose distribution for a novel patient directly from the planning image. We present a probabilistic, atlas-based approach which predicts the dose for novel patients using a set of automatically selected most similar patients (atlases). The output is a spatial dose objective, which specifies the desired dose-per-voxel, and therefore replaces the need to specify and tune dose-volume objectives...
May 9, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28482845/clinical-implementation-of-a-knowledge-based-planning-tool-for-prostate-vmat
#18
Richard Powis, Andrew Bird, Matthew Brennan, Susan Hinks, Hannah Newman, Katie Reed, John Sage, Gareth Webster
BACKGROUND: A knowledge based planning tool has been developed and implemented for prostate VMAT radiotherapy plans providing a target average rectum dose value based on previously achievable values for similar rectum/PTV overlap. The purpose of this planning tool is to highlight sub-optimal clinical plans and to improve plan quality and consistency. METHODS: A historical cohort of 97 VMAT prostate plans was interrogated using a RayStation script and used to develop a local model for predicting optimum average rectum dose based on individual anatomy...
May 8, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28480075/concurrent-chemoradiation-with-volumetric-modulated-arc-therapy-of-patients-treated-for-anal-cancer-acute-toxicity-and-treatment-outcome
#19
Kaloyan Yordanov, Simona Cima, Antonella Richetti, Gianfranco Pesce, Francesco Martucci, Ngwa Che Azinwi, Maria Carla Valli
BACKGROUND: to report the acute toxicity and clinical results in patients with anal cancer treated with volumetric modulated arc therapy (VMAT) concomitant with chemotherapy. METHODS: A cohort of 21 patients with histologically confirmed squamous cell carcinoma of the anal canal was treated with VMAT and chemotherapy. Dose prescription was 39.6 Gy, 1.8 Gy/ fraction for the elective nodal PTV, the macroscopic (tumor and involved lymph nodes) PTV doses were 14.4 Gy up to a total dose of 54 Gy in 4 patients and 19...
April 2017: Journal of Gastrointestinal Oncology
https://www.readbyqxmd.com/read/28476456/dosimetric-comparison-of-single-beam-multi-arc-and-2-beam-multi-arc-vmat-optimization-in-the-monaco-treatment-planning-system
#20
Alan M Kalet, Hannah L Richardson, Darrin A Nikolaisen, Ning Cao, Myra A Lavilla, Claire Dempsey, Juergen Meyer, Wui-Jin Koh, Kenneth J Russell
The purpose of this study was to evaluate the dosimetric and practical effects of the Monaco treatment planning system "max arcs-per-beam" optimization parameter in pelvic radiotherapy treatments. We selected for this study a total of 17 previously treated patients with a range of pelvic disease sites including prostate (9), bladder (1), uterus (3), rectum (3), and cervix (1). For each patient, 2 plans were generated, one using an arc-per-beam setting of "1" and another with an arc-per-beam setting of "2" using the volumes and constraints established from the initial clinical treatments...
May 2, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
keyword
keyword
16097
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"