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https://www.readbyqxmd.com/read/29351303/automated-inverse-optimization-facilitates-lower-doses-to-normal-tissue-in-pancreatic-stereotactic-body-radiotherapy
#1
Ivaylo B Mihaylov, Eric A Mellon, Raphael Yechieli, Lorraine Portelance
PURPOSE: Inverse planning is trial-and-error iterative process. This work introduces a fully automated inverse optimization approach, where the treatment plan is closely tailored to the unique patient anatomy. The auto-optimization is applied to pancreatic stereotactic body radiotherapy (SBRT). MATERIALS AND METHODS: The automation is based on stepwise reduction of dose-volume histograms (DVHs). Five uniformly spaced points, from 1% to 70% of the organ at risk (OAR) volumes, are used...
2018: PloS One
https://www.readbyqxmd.com/read/29338154/characteristics-etiology-and-treatment-of-pediatric-and-adult-anaphylaxis-in-iran
#2
Mohammad Nabavi, Mehrnoosh Lavavpour, Saba Arshi, Mohammad Hasan Bemanian, Hossein Esmaeilzadeh, Rasool Molatefi, Mahsa Rekabi, Javad Ahmadian, Narges Eslami, Sima Shokri, Kian Darabi, Gholam Reza Sedighi, Morteza Fallahpour
Despite the increasing prevalence of anaphylaxis, there is little information about the characteristics and practice of healthcare providers in treating anaphylaxis, so this study was conducted to record the characteristics and therapeutic approaches of anaphylaxis from May 2012 until April 2015, the data of all patients diagnosed with anaphylaxis in the Allergy department of three referral university hospitals in Tehran, Iran were recorded. Thereafter, the demographics, clinical features, triggers and therapeutic approach were evaluated...
December 2017: Iranian Journal of Allergy, Asthma, and Immunology
https://www.readbyqxmd.com/read/29333408/is-long-term-storage-of-cryopreserved-stem-cells-for-hematopoietic-stem-cell-transplantation-a-worthwhile-exercise-in-developing-countries
#3
Santhosh Kumar Devadas, Minal Khairnar, Sumathi S Hiregoudar, Shashank Ojha, Sachin Punatar, Alok Gupta, Anant Gokarn, Pallavi Bhole, Sadhana Kannan, Navin Khattry
Background: Stem cell units (SCUs) that are cryopreserved prior to both autologous and allogeneic hematopoietic stem cell transplants (for donor lymphocyte infusion) remain unused or partially used several times, and become an increased burden to blood banks/SCU repositories. Because of the scarcity of data regarding the duration for which the storage is useful, there is no general consensus regarding disposal of SCUs. Methods: We conducted a retrospective audit of SCU utilization in 435 patients who planned to undergo either autologous stem cell transplantation (auto-SCT) (N=239) or allogeneic stem cell transplantation (allo-SCT) (N=196) at a tertiary cancer care center between November 2007 to January 2015...
December 2017: Blood Research
https://www.readbyqxmd.com/read/29328050/threshold-driven-optimization-for-reference-based-auto-planning
#4
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/29248057/medicaid-program-choice-inertia-and-adverse-selection
#5
James Marton, Aaron Yelowitz, Jeffery C Talbert
In 2012, Kentucky implemented Medicaid managed care statewide, auto-assigned enrollees to three plans, and allowed switching. Using administrative data, we find that the state's auto-assignment algorithm most heavily weighted cost-minimization and plan balancing, and placed little weight on the quality of the enrollee-plan match. Immobility - apparently driven by health plan inertia - contributed to the success of the cost-minimization strategy, as more than half of enrollees auto-assigned to even the lowest quality plans did not opt-out...
December 2017: Journal of Health Economics
https://www.readbyqxmd.com/read/29216310/gbm-auto-a-software-tool-to-simplify-spatial-modelling-and-marine-protected-area-planning
#6
Simon Dedman, Rick Officer, Maurice Clarke, David G Reid, Deirdre Brophy
BOOSTED REGRESSION TREES. EXCELLENT FOR DATA-POOR SPATIAL MANAGEMENT BUT HARD TO USE: Marine resource managers and scientists often advocate spatial approaches to manage data-poor species. Existing spatial prediction and management techniques are either insufficiently robust, struggle with sparse input data, or make suboptimal use of multiple explanatory variables. Boosted Regression Trees feature excellent performance and are well suited to modelling the distribution of data-limited species, but are extremely complicated and time-consuming to learn and use, hindering access for a wide potential user base and therefore limiting uptake and usage...
2017: PloS One
https://www.readbyqxmd.com/read/29173921/multi-institutional-comparison-of-simulated-treatment-delivery-errors-in-ssimrt-manually-planned-vmat-and-autoplan-vmat-plans-for-nasopharyngeal-radiotherapy
#7
Elise M Pogson, Sankar Aruguman, Christian R Hansen, Michael Currie, Bradley M Oborn, Samuel J Blake, Josip Juresic, Cesar Ochoa, Jim Yakobi, Alicia Haman, Admir Trtovac, Martin Carolan, Lois Holloway, David I Thwaites
PURPOSE: To quantify the impact of simulated errors for nasopharynx radiotherapy across multiple institutions and planning techniques (auto-plan generated Volumetric Modulated Arc Therapy (ap-VMAT), manually planned VMAT (mp-VMAT) and manually planned step and shoot Intensity Modulated Radiation Therapy (mp-ssIMRT)). METHODS: Ten patients were retrospectively planned with VMAT according to three institution's protocols. Within one institution two further treatment plans were generated using differing treatment planning techniques...
October 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/29139208/a-knowledge-based-approach-to-automated-planning-for-hepatocellular-carcinoma
#8
Yujie Zhang, Tingting Li, Han Xiao, Weixing Ji, Ming Guo, Zhaochong Zeng, Jianying Zhang
PURPOSE: To build a knowledge-based model of liver cancer for Auto-Planning, a function in Pinnacle, which is used as an automated inverse intensity modulated radiation therapy (IMRT) planning system. METHODS AND MATERIALS: Fifty Tomotherapy patients were enrolled to extract the dose-volume histograms (DVHs) information and construct the protocol for Auto-Planning model. Twenty more patients were chosen additionally to test the model. Manual planning and automatic planning were performed blindly for all twenty test patients with the same machine and treatment planning system...
November 15, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29110926/study-for-reducing-lung-dose-of-upper-thoracic-esophageal-cancer-radiotherapy-by-auto-planning-volumetric-modulated-arc-therapy-vs-intensity-modulated-radiation-therapy
#9
Hua Chen, Hao Wang, Hengle Gu, Yan Shao, Xuwei Cai, Xiaolong Fu, Zhiyong Xu
This study aimed to investigate the dosimetric differences and lung sparing between volumetric-modulated arc therapy (VMAT) and intensity-modulated radiation therapy (IMRT) in the treatment of upper thoracic esophageal cancer with T3N0M0 for preoperative radiotherapy by auto-planning (AP). Sixteen patient cases diagnosed with upper thoracic esophageal cancer T3N0M0 for preoperative radiotherapy were retrospectively studied, and 3 plans were generated for each patient: full arc VMAT AP plan with double arcs, partial arc VMAT AP plan with 6 partial arcs, and conventional IMRT AP plan...
October 27, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29110925/a-novel-imrt-planning-study-by-using-the-fixed-jaw-method-in-the-treatment-of-peripheral-lung-cancer-with-mediastinal-lymph-node-metastasis
#10
Hao Wang, Hua Chen, Hengle Gu, Yan Shao, Xuwei Cai, Xiaolong Fu, Zhiyong Xu
Intensity-modulated radiotherapy (IMRT) is an important technology in cancer radiotherapy. In the current planning system, such as in the Pinnacle(3) system, jaw positions are automatically set to cover all target volumes, and many medical centers in developing countries are not equipped with linear accelerators with a jaw tracing function. As solitary lesions are often located in patients, the resulting radiation leakage and transmission increase the dose exposure in surrounding critical organs, although blocked by multileaf collimator (MLC) leaves...
October 27, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29080045/correction-to-automated-imrt-planning-in-pinnacle-a%C3%A2-study-in-head-and-neck-cancer
#11
J M A M Kusters, K Bzdusek, P Kumar, P G M van Kollenburg, M C Kunze-Busch, M Wendling, T Dijkema, J H A M Kaanders
Correction to: Strahlenther Onkol 2017 https://doi.org/10.1007/s00066-017-1187-9 Unfortunately, parts of the 'Materials and Methods section' and a sentence in the 'Discussion section' had to be corrected.On page 3, left column, the complete first paragraph was corrected and now reads as follows:Auto-P.
October 27, 2017: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/28969706/improved-plan-quality-with-automated-radiotherapy-planning-for-whole-brain-with-hippocampus-sparing-a-comparison-to-the-rtog-0933-trial
#12
J Krayenbuehl, M Di Martino, M Guckenberger, N Andratschke
BACKGROUND: Whole-brain radiation therapy (WBRT) with hippocampus sparing (HS) has been investigated by the radiation oncology working group (RTOG) 0933 trial for patients with multiple brain metastases. They showed a decrease of adverse neurocognitive effects with HS WBRT compared to WBRT alone. With the development of automated treatment planning system (aTPS) in the last years, a standardization of the plan quality at a high level was achieved. The goal of this study was to evaluate the feasibility of using an aTPS for the treatment of HS WBRT and see if the RTOG 0933 dose constraints could be achieved and improved...
October 2, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28963779/automatic-segmentation-of-the-clinical-target-volume-and-organs-at-risk-in-the-planning-ct-for-rectal-cancer-using-deep-dilated-convolutional-neural-networks
#13
Kuo Men, Jianrong Dai, Yexiong Li
PURPOSE: Delineation of the clinical target volume (CTV) and organs at risk (OARs) is very important for radiotherapy but is time-consuming and prone to inter-observer variation. Here, we proposed a novel deep dilated convolutional neural network (DDCNN)-based method for fast and consistent auto-segmentation of these structures. METHODS: Our DDCNN method was an end-to-end architecture enabling fast training and testing. Specifically, it employed a novel multiple-scale convolutional architecture to extract multiple-scale context features in the early layers, which contain the original information on fine texture and boundaries and which are very useful for accurate auto-segmentation...
September 30, 2017: Medical Physics
https://www.readbyqxmd.com/read/28952230/how-can-we-effectively-address-the-paraneoplastic-dermatomyositis-diagnosis-risk-factors-and-treatment-options
#14
Ioannis Zerdes, Maria Tolia, Michail Nikolaou, Nikolaos Tsoukalas, Louloudenia Velentza, Jiannis Hajiioannou, Michail Mitsis, George Kyrgias
PURPOSE: Dermatomyositis (DM) represents an auto-immune inflammatory myopathy. In this review, we analyzed the incidence of DM as a clinical manifestation highlighting the peculiar clinical and treatment characteristics of this disease when occurring in the context of different malignancies. METHODS: A systematic literature review was performed based on database search in PubMed/Medline and included English articles until December 2016. RESULTS: In up to 20% of cases DM appears as a paraneoplastic syndrome associated with multiple malignancies such as ovarian, breast, prostate, lung, nasopharyngeal and colorectal cancer, and non-Hodgkin lymphomas...
July 2017: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/28945107/herpes-zoster-incidence-and-cost-in-patients-receiving-autologous-hematopoietic-stem-cell-transplant
#15
Jianbin Mao, Jeffrey T McPheeters, Dongmu Zhang, Camilo J Acosta, Lyn Finelli
OBJECTIVE: Among patients receiving autologous hematopoietic stem cell transplant (Auto-HSCT), we estimated the incidence of herpes zoster (HZ), compared health care costs among patients with and without HZ, and evaluated antiviral prophylaxis (AP) use. RESEARCH DESIGN AND METHODS: We conducted a retrospective study using data from a large health plan to identify patients ≥18 years with ≥1 claim for an Auto-HSCT procedure during 2006-2011 (N = 2,530). Patients were followed from date of Auto-HSCT until risk-end date, defined as development of HZ, end of enrollment, death, or 12/31/2011...
September 25, 2017: Current Medical Research and Opinion
https://www.readbyqxmd.com/read/28943512/prevalence-of-znt8-antibody-in-turkish-children-and-adolescents-with-new-onset-type-1-diabetes
#16
Selin Elmaoğulları, Seyit Ahmet Uçaktürk, Şehri Elbeg, Esra Döğer, Meltem Tayfun, Fatih Gürbüz, Aysun Bideci
OBJECTIVE: Zinc transporter 8 protein (ZnT8) is a transmembranic protein organizing the zinc transfer to insulin vesicles. Antibodies formed against ZnT8 (ZnT8A) are regarded as an independent autoimmunity demonstrator in type 1 diabetes (T1D) diagnosis Investigation of ZnT8ab prevalence in Turkish children with new onset T1D was planned in this study. METHODS: 84 patients between 1-18 years of age diagnosed with T1D between February 2015- March 2016 and the control group consisting of 50 healthy children without any autoimmune diseases were included in the study...
September 25, 2017: Journal of Clinical Research in Pediatric Endocrinology
https://www.readbyqxmd.com/read/28925817/using-multiple-classifiers-for-predicting-the-risk-of-endovascular-aortic-aneurysm-repair-re-intervention-through-hybrid-feature-selection
#17
Omneya Attallah, Alan Karthikesalingam, Peter Je Holt, Matthew M Thompson, Rob Sayers, Matthew J Bown, Eddie C Choke, Xianghong Ma
Feature selection is essential in medical area; however, its process becomes complicated with the presence of censoring which is the unique character of survival analysis. Most survival feature selection methods are based on Cox's proportional hazard model, though machine learning classifiers are preferred. They are less employed in survival analysis due to censoring which prevents them from directly being used to survival data. Among the few work that employed machine learning classifiers, partial logistic artificial neural network with auto-relevance determination is a well-known method that deals with censoring and perform feature selection for survival data...
September 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28881055/individual-healthcare-plan-for-allergic-children-at-school-lessons-from-a-2015-2016-school-year-survey
#18
Guillaume Pouessel, Stépanie Lejeune, Marie-Pierre Dupond, Annie Renard, Camille Fallot, Antoine Deschildre
BACKGROUND: The individual healthcare plan (IHP) was implemented in schools in France in 2003 to improve management of allergic children. Our objectives were to assess the practical aspects of IHP (excluding asthma) and allergic reactions occurring at school. METHODS: Prospective study conducted in the North Department (France) during the 2015/2016 school year. Two questionnaires were developed: one for the school doctors (n = 67) and one for the school principals (n = 2372)...
September 7, 2017: Pediatric Allergy and Immunology
https://www.readbyqxmd.com/read/28865314/safety-analysis-of-urban-arterials-at-the-meso-level
#19
Jia Li, Xuesong Wang
Urban arterials form the main structure of street networks. They typically have multiple lanes, high traffic volume, and high crash frequency. Classical crash prediction models investigate the relationship between arterial characteristics and traffic safety by treating road segments and intersections as isolated units. This micro-level analysis does not work when examining urban arterial crashes because signal spacing is typically short for urban arterials, and there are interactions between intersections and road segments that classical models do not accommodate...
November 2017: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/28854714/routine-serum-thyroid-stimulating-hormone-testing-optimizing-pre-conception-health-or-generating-toxic-knowledge
#20
Abha Maheshwari, Priya Bhide, Jyotsna Pundir, Siladitya Bhattacharya
Monitoring subclinical hypothyroidism (SCH) in women is believed to be important in terms of preventing overt hypothyroidism and optimizing the health and cognitive development of their children. Current systematic reviews have suggested an association between maternal SCH and adverse obstetric and neonatal outcomes. However, initiating the administration of thyroxine during pregnancy has failed to demonstrate appreciable health benefits. Hence there are calls by professional endocrine societies for optimizing serum thyroid-stimulating hormone (TSH) levels pre-conception...
September 1, 2017: Human Reproduction
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