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"IMRT"

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https://www.readbyqxmd.com/read/29351691/out-of-field-doses-in-children-treated-for-large-arteriovenous-malformations-using-hypofractionated-gamma-knife-radiosurgery-and-intensity-modulated-radiation-therapy
#1
Marijke De Saint-Hubert, Marija Majer, Hrvoje Hršak, Zdravko Heinrich, Željka Kneževic, Saveta Miljanic, Paulina Porwol, Liliana Stolarczyk, Filip Vanhavere, Roger M Harrison
The purpose of this study was to measure out-of-field organ doses in two anthropomorphic child phantoms for the treatment of large brain arteriovenous malformations (AVMs) using hypofractionated gamma knife (GK) radiosurgery and to compare these with an alternative treatment using intensity-modulated radiation therapy (IMRT). Target volume was identical in size and shape in all cases. Radiophotoluminescent (RPL), thermoluminescent (TL) and optically stimulated luminescent (OSL) dosimeters were used for out-of-field dosimetry during GK treatment and a good agreement within 1-2% between results was shown...
January 17, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29351088/fraction-variant-beam-orientation-optimization-for-non-coplanar-imrt
#2
Daniel O'Connor, Victoria Yu, Dan Nguyen, Dan Ruan, Ke Sheng
Conventional beam orientation optimization (BOO) algorithms for IMRT assume that the same set of beam angles is used for all treatment fractions. In this paper we present a BOO formulation based on group sparsity that simultaneously optimizes non-coplanar beam angles for all fractions, yielding a fraction-variant (FV) treatment plan. Beam angles are selected by solving a multi-fraction fluence map optimization problem involving 500-700 candidate beams per fraction, with an additional group sparsity term that encourages most candidate beams to be inactive...
January 19, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29350197/a-three-dimensional-correction-method-for-predicting-the-readings-of-a-pinpoint-chamber-on-the-cyberknife-sup-%C3%A2-sup-m6%C3%A2-machine
#3
Yongqian Zhang, Edward Brandner, Cihat Ozhasoglu, Ron Lalonde, Dwight E Heron, M Saiful Huq
The use of small fields in radiation therapy techniques has increased substantially in particular in stereotactic radiosurgery (SRS) and stereotactic body radiation therapy (SBRT). However, as field size reduces further still, the response of the detector changes more rapidly with field size, and the effects of measurement uncertainties become increasingly significant. This work presents a novel 3D dose volume-to-point correction method to predict the readings of a 0.015cc PinPoint chamber (PTW 31014) for both small static-fields and composite-field dosimetry formed by fixed cones on the CyberKnife® M6™ machine...
January 19, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29349933/patient-s-specific-integration-of-oar-doses-d2%C3%A2-cc-from-ebrt-and-3d-image-guided-brachytherapy-for-cervical-cancer
#4
Edgar Gelover, Cabel Katherine, Christopher Mart, Wenqing Sun, Yusung Kim
The objective of this study was to assess the recommended DVH parameter (e.g., D2 cc) addition method used for combining EBRT and HDR plans, against a reference dataset generated from an EQD2-based DVH addition method. A revised DVH parameter addition method using EBRT DVH parameters derived from each patient's plan was proposed and also compared with the reference dataset. Thirty-one biopsy-proven cervical cancer patients who received EBRT and HDR brachytherapy were retrospectively analyzed. A parametrial and/or paraaortic EBRT boost were clinically performed on 13 patients...
January 19, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29349867/volumetric-modulated-arc-therapy-treatment-planning-of-thoracic-vertebral-metastases-using-stereotactic-body-radiotherapy
#5
Matthew Mallory, Damodar Pokhrel, Rajeev Badkul, Hongyu Jiang, Christopher Lominska, Fen Wang
PURPOSE/OBJECTIVES: To retrospectively evaluate the plan quality, treatment efficiency, and accuracy of volumetric modulated arc therapy (VMAT) plans for thoracic spine metastases using stereotactic body radiotherapy (SBRT). MATERIALS/METHODS: Seven patients with thoracic vertebral metastases treated with noncoplanar hybrid arcs (NCHA) (1 to 2 3D-conformal partial arcs +7 to 9 IMRT beams) were re-optimized with VMAT plans using three coplanar arcs. Tumors were located between T2 and T7 and PTVs ranged between 24...
January 19, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29349604/quality-of-training-in-radiation-oncology-in-germany-where-do-we-stand-results-from-a%C3%A2-2016-2017-survey-performed-by-the-working-group-young-degro-of-the-german-society-of-radiation-oncology-degro
#6
C T Dietzel, K Jablonska, M Niyazi, T Gauer, N Ebert, C Ostheimer, D Krug
PURPOSE: To evaluate the current situation of young radiation oncologists in Germany with regard to the contents and quality of training and level of knowledge, as well as their working conditions and professional satisfaction. METHODS: From June 2016 to February 2017, a survey was conducted by the young DEGRO (yDEGRO) using an online platform. The questionnaire consisted of 28 items examining a broad range of aspects influencing residency. There were 96 completed questionnaires RESULTS: 83% of participants stated to be very or mostly pleased with their residency training...
January 18, 2018: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/29348828/dose-escalation-by-image-guided-intensity-modulated-radiotherapy-leads-to-an-increase-in-pain-relief-for-spinal-metastases-a-comparison-study-with-a-regimen-of-30-gy-in-10-fractions
#7
Jinlan He, Jianghong Xiao, Xingchen Peng, Baofeng Duan, Yan Li, Ping Ai, Min Yao, Nianyong Chen
Purpose: Under the existing condition that the optimum radiotherapy regimen for spinal metastases is controversial, this study investigates the benefits of dose escalation by image-guided intensity-modulated radiotherapy (IG-IMRT) with 60-66 Gy in 20-30 fractions for spinal metastases. Results: In the dose-escalation group, each D50 of planning gross tumor volume (PGTV) was above 60 Gy and each Dmax of spinal cord planning organ at risk volume (PRV) was below 48 Gy...
December 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/29346519/final-results-of-a-multi-institutional-phase-ii-trial-of-re-irradiation-with-concurrent-weekly-cisplatin-and-cetuximab-for-recurrent-or-second-primary-squamous-cell-carcinoma-of-the-head-and-neck
#8
M J Awan, L Nedzi, D Wang, V Tumati, B Sumer, X-J Xie, I Smith, J Truelson, R Hughes, L L Myers, P Lavertu, S Wong, M Yao
Background: The optimal regimen of chemotherapy and re-irradiation (re-XRT) for recurrent head and neck squamous cell carcinoma (HNSCC) is controversial. We report the final outcomes of a multi-center Phase II trial evaluating cetuximab and cisplatin-based chemotherapy concurrent with re-XRT for patients with recurrent HNSCC. Methods and Materials: Patients with unresectable recurrent disease or positive margins after salvage surgery arising within a previously irradiated field with KPS≥70 were eligible for this trial...
January 15, 2018: Annals of Oncology: Official Journal of the European Society for Medical Oncology
https://www.readbyqxmd.com/read/29344223/application-of-intensity-modulated-radiation-therapy-in-the-treatment-of-nasopharyngeal-carcinoma
#9
Hao Yan, Xiaoming Cao, Jinmei Wang
The objective of the present study was to investigate the application values of the intensity-modulated radiation therapy (IMRT) and the three-dimensional conformal radiation therapy (3D-CRT) in the treatment of nasopharyngeal carcinoma (NPC). A total of 124 patients diagnosed with nasopharyngeal carcinomas were included into the study and randomly divided into the control group and the observation group, with 62 patients in each group. The 3D-CRT combined with postoperative chemotherapy were performed on the control group and the observation group received IMRT combined with postoperative chemotherapy, and then were followed up for a median duration of 25...
December 2017: Oncology Letters
https://www.readbyqxmd.com/read/29344136/clinical-outcome-of-extended-field-irradiation-vs-pelvic-irradiation-using-intensity-modulated-radiotherapy-for-cervical-cancer
#10
Yi Ouyang, Yanhong Wang, Kai Chen, Xinping Cao, Yiming Zeng
The aim of the present study was to evaluate the distinctions in survival and toxicity between patients with cervical cancer with common iliac node or para-aortic node involvement, who were treated with extended-field intensity-modulated radiotherapy (EF-IMRT) and patients with or without lower involved pelvic nodes, who were treated with pelvic IMRT. A total of 55 patients treated with EF-IMRT and 52 patients treated with pelvic IMRT at the Sun Yat-Sen University Cancer Center (Guangzhou, China) were retrospectively analyzed...
December 2017: Oncology Letters
https://www.readbyqxmd.com/read/29338089/outcomes-of-patients-diagnosed-with-carcinoma-metastatic-to-the-neck-from-an-unknown-primary-source-and-treated-with-intensity-modulated-radiation-therapy
#11
Mona Kamal, Abdallah S R Mohamed, Clifton David Fuller, Erich M Sturgis, Faye M Johnson, William H Morrison, G Brandon Gunn, Katherine A Hutcheson, Jack Phan, Stefania Volpe, Sweet Ping Ng, Renata Ferrarotto, Steven J Frank, Heath D Skinner, David I Rosenthal, Adam S Garden
BACKGROUND: There are few published studies to guide the treatment of carcinoma metastatic to the neck from an unknown primary (CUP). In this regard, the objective of the current study was to share the authors' current experience treating patients with CUP using intensity-modulated radiation therapy (IMRT), which principally targeted both sides of the neck, the nasopharynx, and the oropharynx. METHODS: This was a retrospective study in which an institutional database search was conducted to identify patients with CUP who received IMRT...
January 16, 2018: Cancer
https://www.readbyqxmd.com/read/29336348/optimizing-highly-noncoplanar-vmat-trajectories-the-novo-method
#12
Marco Langhans, Jan Unkelbach, Thomas Bortfeld, David Craft
We introduce a new method called NoVo (Noncoplanar VMAT Optimization) to produce volumetric modulated arc therapy (VMAT) treatment plans with noncoplanar trajectories. While the use of noncoplanar beam arrangements for intensity modulated radiation therapy (IMRT), and in particular high fraction stereotactic radiosurgery (SRS), is common, noncoplanar beam trajectories for VMAT are less common as the availability of treatment machines handling these is limited. For both IMRT and VMAT, the beam angle selection problem is highly nonconvex in nature, which is why automated beam angle selection procedures have not entered mainstream clinical usage...
January 16, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29334605/induction-chemotherapy-plus-concurrent-chemoradiotherapy-versus-concurrent-chemoradiotherapy-alone-in-locoregionally-advanced-nasopharyngeal-carcinoma-in-children-and-adolescents-a-matched-cohort-analysis
#13
Yang Li, Lin-Quan Tang, Li-Ting Liu, Shan-Shan Guo, Yu-Jing Liang, Xue-Song Sun, Qing-Nan Tang, Jin-Xin Bei, Jing Tan, Shuai Chen, Jun Ma, Chong Zhao, Qiu-Yan Chen, Hai-Qiang Mai
Purpose: The purpose of this study was to evaluate the long-term clinical outcome and toxicity of induction chemotherapy (IC) followed by concomitant chemoradiotherapy (CCRT) compared with CCRT alone for the treatment of children and adolescent locoregionally advanced nasopharyngeal carcinoma (LACANPC). Patients and Methods: A total of 194 locoregionally advanced NPC patients younger than 21 years who received CCRT with or without IC before were included in the study population...
January 8, 2018: Cancer Research and Treatment: Official Journal of Korean Cancer Association
https://www.readbyqxmd.com/read/29328050/threshold-driven-optimization-for-reference-based-auto-planning
#14
Troy Long, Mingli Chen, Steve B Jiang, Weiguo Lu
We study threshold-driven optimization methodology for automatically generating a treatment plan that is motivated by a reference DVH for IMRT treatment planning. We present a framework for threshold-driven optimization for reference-based auto-planning (TORA). Commonly used voxel-based quadratic penalties have two components for penalizing under- and over-dosing of voxels: a reference dose threshold and associated penalty weight. Conventional manual- and auto-planning using such a function involves iteratively updating the preference weights while keeping the thresholds constant, an unintuitive and often inconsistent method for planning toward some reference DVH...
January 12, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29324861/cost-of-treatment-for-head-and-neck-cancer-in-india
#15
Akashdeep Singh Chauhan, Shankar Prinja, Sushmita Ghoshal, Roshan Verma, Arun S Oinam
There are no published data on the cost of cancer treatment for guiding reimbursement decisions in India. The present study was designed to estimate the cost of treating head and neck cancer (HNC) with the aim of determining package rates. The present study was undertaken in the Departments of Radiotherapy and Otolaryngology of a large tertiary care hospital in North India. Economic health system costs incurred were assessed using a bottom-up methodology. Data on all resources-capital or recurrent, incurred on the delivery of HNC treatment were collected from April 2014 to March 2015...
2018: PloS One
https://www.readbyqxmd.com/read/29324547/stereotactic-body-radiation-therapy-intensity-modulated-radiation-therapy-and-brachytherapy-boost-modalities-in-invasive-cervical-cancer-a-study-of-the-national-cancer-data-base
#16
Barrett OʼDonnell, Jay C Shiao, Todd A Pezzi, Nabila Waheed, Shelly Sharma, Mark D Bonnen, Michelle S Ludwig
BACKGROUND AND PURPOSE: Our objective was to determine whether stereotactic body radiotherapy (SBRT), intensity-modulated radiation therapy (IMRT), and brachytherapy boost techniques have comparable overall survival in treating cervical cancer when adjusted for known prognostic factors. MATERIALS AND METHODS: We used the National Cancer Database to study women with invasive cervical cancer who were treated with radiation between 2004 and 2013. A logistic regression model was built to identify factors associated with the receipt of SBRT and IMRT...
January 10, 2018: International Journal of Gynecological Cancer
https://www.readbyqxmd.com/read/29320570/image-guided-whole-pelvic-intensity-modulated-radiotherapy-for-biochemical-recurrence-following-radical-prostatectomy-in-high-risk-prostate-cancer-patients
#17
Sang Jun Byun, Young Seok Kim, Hanjong Ahn, Choung-Soo Kim
BACKGROUND: The optimal field size of salvage radiotherapy (SRT) for biochemical recurrence, particularly for patients with high-risk prostate cancer, remains undefined. This retrospective analysis was performed to investigate oncological outcomes as well as treatment-related toxicity following salvage intensity-modulated radiotherapy (IMRT) to the whole pelvis and to compare the results with other studies implementing a small field size of the prostate bed. METHODS: The medical records of 170 patients with high-risk prostate cancer who received SRT for biochemical recurrence following prostatectomy were reviewed...
2018: PloS One
https://www.readbyqxmd.com/read/29315174/oligorecurrent-nodal-prostate-cancer-long-term-results-of-an-elective-nodal-irradiation-approach
#18
Sebastien Tran, Sandra Jorcano, Teresa Falco, Giorgio Lamanna, Raymond Miralbell, Thomas Zilli
OBJECTIVES: The objective of this study was to report long-term results of elective nodal radiotherapy (ENRT) in prostate cancer (PCa) patients with oligorecurrent nodal disease after primary treatment. METHODS: Data of 53 oligorecurrent PCa patients (N1 and/or M1a) with ≤5 nodal metastases (n=108) treated with ENRT combined with androgen deprivation therapy (ADT) between 2004 and 2016 were retrospectively reviewed. Median prostate-specific antigen (PSA) and PSA doubling time (DT) were 3...
January 8, 2018: American Journal of Clinical Oncology
https://www.readbyqxmd.com/read/29312726/is-a-clinical-target-volume-ctv-necessary-for-locally-advanced-non-small-cell-lung-cancer-treated-with-intensity-modulated-radiotherapy-a-dosimetric-evaluation-of-three-different-treatment-plans
#19
Fan Xia, Lijun Zhou, Xi Yang, Li Chu, Xiaofei Zhang, Jinjin Chu, Weigang Hu, Zhengfei Zhu
Background: The aim of this study was to determine the feasibility of omitting the clinical target volume (CTV) in patients with locally advanced non-small cell lung cancer (NSCLC) treated with intensity-modulated radiotherapy (IMRT) by comparing dosimetric characteristics of three different IMRT plans with or without CTV implementation. Methods: Thirteen patients with stage III NSCLC were reviewed. Target volumes were contoured such that the planning target volume (PTV) derived from the gross tumor volume (GTV) directly was named PTV_g and that from GTV plus CTV margin was named PTV_c...
December 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29312634/experimental-verification-of-a-3d-in-vivo-dose-monitoring-system-based-on-epid
#20
Xiaoyong Wang, Lixin Chen, Conghua Xie, Dajiang Wang, Gaili Chen, Zhengming Fu, Hui Liu
Purpose: To evaluate the Edose system, a novel three-dimensional (3D) in vivo dose monitoring system based on electronic portal imaging device (EPID), prior to clinical application, we analyzed the preliminary clinical data using Edose system in patients receiving intensity-modulated radiation therapy (IMRT). Materials and methods: After the physical modeling, the measured results from the Edose system were examined in homogeneous and inhomogeneous phantoms, respectively...
December 12, 2017: Oncotarget
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