keyword
MENU ▼
Read by QxMD icon Read
search

"IMRT"

keyword
https://www.readbyqxmd.com/read/28528206/feasibility-of-atlas-based-active-bone-marrow-sparing-intensity-modulated-radiation-therapy-for-cervical-cancer
#1
Nan Li, Sonal S Noticewala, Casey W Williamson, Hanjie Shen, Igor Sirak, Rafal Tarnawski, Umesh Mahantshetty, Carl K Hoh, Kevin L Moore, Loren K Mell
BACKGROUND: To test the hypothesis that atlas-based active bone marrow (ABM)-sparing intensity modulated radiation therapy (IMRT) yields similar dosimetric results compared to custom ABM-sparing IMRT for cervical cancer patients. METHODS: We sampled 62 cervical cancer patients with pre-treatment FDG-PET/CT in training (n=32) or test (n=30) sets. ABM was defined as the subvolume of the pelvic bone marrow (PBM) with standardized uptake value (SUV) above the mean on the average FDG-PET image (ABMAtlas) vs...
May 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28526192/comparison-of-spinal-stereotactic-body-radiotherapy-sbrt-planning-techniques-intensity-modulated-radiation-therapy-modulated-arc-therapy-and-helical-tomotherapy
#2
Jina Kim, Hong Seok Jang, Yeon Sil Kim, Byung Ock Choi, Young-Nam Kang
Stereotactic body radiotherapy (SBRT) delivers a highly conformal, hypofractionated radiation dose to a small target with minimal radiation applied to the surrounding areas. Therefore, using the proper treatment planning techniques for SBRT is important. Intensity modulation techniques, such as static intensity-modulated radiation therapy (IMRT), modulated arc therapy (mARC), and helical tomotherapy (HT), are useful for spinal SBRT because of a rapid dose fall-off and spinal cord avoidance. This study compared the planning characteristics for hypofractionated spinal SBRT administered using 3 treatment techniques...
May 16, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
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
#3
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
#4
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/28517613/a-quantitative-method-to-the-analysis-of-mlc-leaf-position-and-speed-based-on-epid-and-ebt3-film-for-dynamic-imrt-treatment-with-different-types-of-mlc
#5
Yinghui Li, Lixin Chen, Jinhan Zhu, Bin Wang, Xiaowei Liu
A quantitative method based on the electronic portal imaging system (EPID) and film was developed for MLC position and speed testing; this method was used for three MLC types (Millennium, MLCi, and Agility MLC). To determine the leaf position, a picket fence designed by the dynamic (DMLC) model was used. The full-width half-maximum (FWHM) values of each gap measured by EPID and EBT3 were converted to the gap width using the FWHM versus nominal gap width relationship. The algorithm developed for the picket fence analysis was able to quantify the gap width, the distance between gaps, and each individual leaf position...
May 18, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28515675/utility-of-intraoral-stents-in-external-beam-radiotherapy-for-head-and-neck-cancer
#6
Hiroshi Doi, Masao Tanooka, Toshihisa Ishida, Kuniyasu Moridera, Kenji Ichimiya, Kazuo Tarutani, Kazuhiro Kitajima, Masayuki Fujiwara, Hiromitsu Kishimoto, Norihiko Kamikonya
AIM: This study aimed to assess the utility and stability of intraoral stent during intensity-modulated radiation therapy (IMRT). BACKGROUND: The benefits of intraoral stents in radiotherapy are unclear. MATERIALS AND METHODS: We analyzed 386 setup errors in 12 patients who received IMRT for head and neck cancers without intraoral stents (intraoral stent [-]) and 183 setup errors in 6 patients who received IMRT with intraoral stents (intraoral stent [+])...
July 2017: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/28515352/intensity-modulated-radiotherapy-provides-better-quality-of-life-than-two-dimensional-conventional-radiotherapy-for-patients-with-stage-ii-nasopharyngeal-carcinoma
#7
Xin-Bin Pan, Shi-Ting Huang, Kai-Hua Chen, Yan-Ming Jiang, Jia-Lin Ma, Song Qu, Ling Li, Long Chen, Xiao-Dong Zhu
Two-dimensional conventional radiotherapy (2D-CRT) and intensity-modulated radiotherapy (IMRT) are effective for control of nasopharyngeal carcinoma (NPC). The purpose of this study was to compare the quality of life (QoL) of stage II NPC patients treated with 2D-CRT versus IMRT. We conducted a cross-sectional study of 106 patients with stage II NPC treated with 2D-CRT (n = 47) versus IMRT (n = 59) between June 2008 and June 2013. For all subjects, disease-free survival was more than 3 years. QoL was assessed using the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire-Core 30 (EORTC QLQ-C30) questions and the Head and Neck 35 (EORTC QLQ-H&N35) questions...
May 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/28512284/improved-survival-in-patients-with-resected-pancreatic-carcinoma-using-postoperative-intensity-modulated-radiotherapy-and-regional-intra-arterial-infusion-chemotherapy
#8
Ningyi Ma, Zheng Wang, Jiandong Zhao, Jiang Long, Jin Xu, Zhigang Ren, Guoliang Jiang
BACKGROUND We assessed the role of adjuvant intensity-modulated radiotherapy (IMRT) in combination with chemotherapy for pancreatic carcinomas after curative resection and identified prognostic factors related to pancreatic carcinoma after multidisciplinary treatment strategies. MATERIAL AND METHODS Pancreatic carcinoma patients (n=61) who received adjuvant radiotherapy after resection (median dose, 50.4 Gy) between 2010 and 2016 were retrospectively identified. Sixty patients received chemotherapy, including concurrent chemoradiotherapy (CCRT), systemic chemotherapy, and regional intra-arterial infusion chemotherapy (RIAC)...
May 17, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28511960/inadequate-target-volume-delineation-and-local-regional-recurrence-after-intensity-modulated-radiotherapy-for-human-papillomavirus-positive-oropharynx-cancer
#9
Allen M Chen, Robert Chin, Philip Beron, Taeko Yoshizaki, Argin G Mikaeilian, Minsong Cao
PURPOSE: To perform a spatial analysis of local-regional recurrences, in relation to quantitative dose distribution, among patients treated by intensity-modulated radiotherapy (IMRT) for human papillomavirus (HPV)-positive oropharyngeal cancer. METHODS AND MATERIALS: The records of 107 consecutive patients who presented for consideration of re-irradiation for local-regional recurrent disease occurring in a previously irradiated field were reviewed. The original IMRT plans were retrieved for those with HPV-positive disease originating from the oropharynx, and deformable image registration was used to fuse the magnetic resonance imaging (MRI) and positron emission tomography (PET) scans obtained at recurrence to the pre-treatment planning computed tomography (CT) dataset...
May 13, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28506589/the-relationship-between-dosimetric-factors-side-effects-and-survival-in-patients-with-non-small-cell-lung-cancer-treated-with-definitive-radiotherapy
#10
Dilruba Okumus, Sureyya Sarihan, Sema Gozcu, Deniz Sigirli
The patients with non-small cell lung cancer (NSCLC) treated with definitive conformal radiotherapy (RT) were evaluated in terms of side effects and survival. Normal tissue complication probability (NTCP) was calculated for 68 patients treated between 2009 and 2012. Clinical and dosimetric factors were analyzed. The median dose of 63 Gy (range: 54 to 70 Gy) was given with conformal RT with blocks (n = 37), 3-dimensional conformal RT (3DCRT) (n = 11), or intensity-modulated RT (IMRT) (n = 20)...
May 12, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28503964/recent-advances-in-intensity-modulated-radiotherapy-and-proton-therapy-for-esophageal-cancer
#11
Mian Xi, Steven H Lin
Radiotherapy is an important component of the standard of care for esophageal cancer. In the past decades, significant improvements in the planning and delivery of radiation techniques have led to better dose conformity to the target volume and improved normal tissue sparing. Areas covered: This review focuses on the advances in radiotherapy techniques and summarizes the availably dosimetric and clinical outcomes of intensity-modulated radiation therapy (IMRT), volumetric modulated arc therapy, proton therapy, and four-dimensional radiotherapy for esophageal cancer, and discusses the challenges and future development of proton therapy...
May 13, 2017: Expert Review of Anticancer Therapy
https://www.readbyqxmd.com/read/28502238/parotid-gland-mean-dose-as-a-xerostomia-predictor-in-low-dose-domains
#12
Hubert Szymon Gabryś, Florian Buettner, Florian Sterzing, Henrik Hauswald, Mark Bangert
PURPOSE: Xerostomia is a common side effect of radiotherapy resulting from excessive irradiation of salivary glands. Typically, xerostomia is modeled by the mean dose-response characteristic of parotid glands and prevented by mean dose constraints to either contralateral or both parotid glands. The aim of this study was to investigate whether normal tissue complication probability (NTCP) models based on the mean radiation dose to parotid glands are suitable for the prediction of xerostomia in a highly conformal low-dose regime of modern intensity-modulated radiotherapy (IMRT) techniques...
May 13, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28500783/on-mixed-electron-photon-radiation-therapy-optimisation-using-the-column-generation-approach
#13
Marc-André Renaud, Monica Serban, Jan Seuntjens
PURPOSE: Despite considerable increase in the number of degrees of freedom handled by recent radiotherapy optimisation algorithms, treatments are still typically delivered using a single modality. Column generation is an iterative method for solving large optimisation problems. It is well suited for mixed-modality (e.g., photon-electron) optimisation as the aperture shaping and modality selection problem can be solved rapidly, and the performance of the algorithm scales favourably with increasing degrees of freedom...
May 13, 2017: Medical Physics
https://www.readbyqxmd.com/read/28499607/evaluation-of-intensity-modulated-radiation-therapy-dose-painting-for-localized-prostate-cancer-using-68-ga-hbed-cc-psma-pet-ct-a-planning-study-based-on-histopathology-reference
#14
Constantinos Zamboglou, Ilias Sachpazidis, Khodor Koubar, Vanessa Drendel, Rolf Wiehle, Simon Kirste, Michael Mix, Florian Schiller, Panayiotis Mavroidis, Philipp T Meyer, Martin Werner, Anca L Grosu, Dimos Baltas
PURPOSE: To demonstrate the feasibility and to evaluate the tumour control probability (TCP) and normal tissue complication probability (NTCP) of IMRT dose painting using (68)Ga-HBED-CC PSMA PET/CT for target delineation in prostate cancer (PCa). METHODS AND MATERIALS: 10 patients had PSMA PET/CT scans prior to prostatectomy. GTV-PET was generated on the basis of an intraprostatic SUVmax of 30%. Two IMRT plans were generated for each patient: Plan(77) which consisted of whole-prostate IMRT to 77Gy, and Plan(95) which consisted of whole-prostate IMRT to 77Gy and a simultaneous integrated boost to the GTV-PET up to 95Gy (35 fractions)...
May 9, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28498818/comparison-of-the-efficacy-between-intensity-modulated-radiotherapy-and-two-dimensional-conventional-radiotherapy-in-stage-ii-nasopharyngeal-carcinoma
#15
Xin-Bin Pan, Kai-Hua Chen, Shi-Ting Huang, Yan-Ming Jiang, Jia-Lin Ma, Zhong-Guo Liang, Song Qu, Ling Li, Long Chen, Xiao-Dong Zhu
We compared treatment outcomes in patients with stage II nasopharyngeal carcinoma (NPC) treated with intensity-modulated radiotherapy (IMRT) or two-dimensional conventional radiotherapy (2D-CRT). Stage II (2010 UICC/AJCC staging system) NPC patients treated with IMRT (n = 178) or 2D-CRT (n = 73) between January 2007 and December 2014 were retrospectively analyzed. Patients were matched using the propensity score-matching method. The primary endpoint was overall survival (OS). Secondary endpoints were local relapse-free survival (LRFS), regional relapse-free survival (RRFS), distant metastasis-free survival (DMFS), and disease-free survival (DFS)...
April 27, 2017: Oncotarget
https://www.readbyqxmd.com/read/28493848/investigating-multi-objective-fluence-and-beam-orientation-imrt-optimization
#16
Peter Simon Potrebko, Jason Fiege, Matthew Biagioli, Jan Poleszczuk
Radiation Oncology treatment planning requires compromises to be made between clinical objectives that are invariably in conflict. It would be beneficial to have a "bird's-eye-view" perspective of the full spectrum of treatment plans that represent the possible trade-offs between delivering the intended dose to the planning target volume (PTV) while optimally sparing the organs-at-risk (OARs). In this work, the authors demonstrate Pareto-Aware Radiotherapy Evolutionary Treatment Optimization (PARETO), a multi-objective tool featuring such bird's-eye-view functionality, which optimizes fluence patterns and beam angles for intensity-modulated radiation therapy (IMRT) treatment planning...
May 11, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28490699/-effect-of-tumor-volume-on-pulmonary-dose-volume-parameter-by-intensity-modulated-radiation-therapy-in-non-small-cell-lung-cancer
#17
Xi Zou, Jinmei Chen, Jinsheng Hong, Feibao Guo, Linzhen Lan, Weijian Zhang
To explore the effectof tumor volume on pulmonary dose-volume parameters by intensity-modulated radiation therapy (IMRT) in non-small cell lung cancer (NSCLC), and to provide a basis for pulmonary dose parameters in IMRT treatment.
 Methods: A total of 204 patients with NSCLC received IMRT were retrospectively analyzed from June, 2009 to October, 2013. The prescribed dose of planning target volume (PTV) for primary tumor was 60-66Gy (2.00-2.25 Gy, 27-33 times in all). The fractional volume percent of the lung received a dose >5 or 20 Gy (V5, V20), and absolute volume of lung received a dose <5 Gy (AVS5)...
April 28, 2017: Zhong Nan da Xue Xue Bao. Yi Xue Ban, Journal of Central South University. Medical Sciences
https://www.readbyqxmd.com/read/28490344/dosimetric-advantage-of-volumetric-modulated-arc-therapy-in-the-treatment-of-intraocular-cancer
#18
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
#19
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/28485335/radical-chemo-irradiation-using-intensity-modulated-radiotherapy-for-locally-advanced-head-and-neck-cancer-in-elderly-patients-experience-from-a-tertiary-care-center-in-south-india
#20
J R Chalissery, P C Sudheeran, K M Varghese, K Venkatesan
OBJECTIVE: To assess the feasibility, tolerance and response of radical chemo irradiation using Intensity modulated Radiotherapy [IMRT] in elderly patients [age >65] with locally advanced head and neck cancer. MATERIAL AND METHODS: Patients aged 65 and above [range 65 to 84years] registered in oncology outpatient unit in our institution between December 2011 to 2014, with stage III and IV head and neck cancer were treated with radical dose of radiotherapy using IMRT and concurrent chemotherapy with cisplatin 40mg/sq...
October 2016: Indian Journal of Cancer
keyword
keyword
80196
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"