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https://www.readbyqxmd.com/read/28339918/can-clinically-relevant-dose-errors-in-patient-anatomy-be-detected-by-gamma-passing-rate-or-modulation-complexity-score-in-volumetric-modulated-arc-therapy-for-intracranial-tumors
#1
Shingo Ohira, Yoshihiro Ueda, Masaru Isono, Akira Masaoka, Misaki Hashimoto, Masayoshi Miyazaki, Masaaki Takashina, Masahiko Koizumi, Teruki Teshima
We investigated whether methods conventionally used to evaluate patient-specific QA in volumetric-modulated arc therapy (VMAT) for intracranial tumors detect clinically relevant dosimetric errors. VMAT plans with coplanar arcs were designed for 37 intracranial tumors. Dosimetric accuracy was validated by using a 3D array detector. Dose deviations between the measured and planned doses were evaluated by gamma analysis. In addition, modulation complexity score for VMAT (MCSv) for each plan was calculated. Three-dimensional dose distributions in patient anatomy were reconstructed using 3DVH software, and clinical deviations in dosimetric parameters between the 3DVH doses and planned doses were calculated...
March 3, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28333046/effect-of-competing-ions-and-causticization-on-the-ammonia-adsorption-by-a-novel-poly-ligand-exchanger-ple-ammonia-adsorption-reagent
#2
Quanzhou Chen, Kanggen Zhou, Yuanjuan Hu, Fang Liu, Aihe Wang
In this paper, a poly ligand exchanger, Cu(II)-loaded chelating resin named ammonia adsorption reagent (AMAR), bearing the functional group of weak iminodiacetate acid, was prepared to efficiently remove ammonia from solutions. Batch adsorption equilibrium experiments were conducted under a range of conditions. The effects of pH on the removal of ammonia by AMAR were investigated at 25 °C. The copper loaded on the resin forms a complex with NH3 in solution under alkaline condition. The effect of alkaline dosage (AD) on the ammonia adsorption was investigated...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28327655/thin-film-metallic-glass-an-effective-diffusion-barrier-for-se-doped-agsbte2-thermoelectric-modules
#3
Chia-Chi Yu, Hsin-Jay Wu, Ping-Yuan Deng, Matthias T Agne, G Jeffrey Snyder, Jinn P Chu
The thermal stability of joints in thermoelectric (TE) modules, which are degraded during interdiffusion between the TE material and the contacting metal, needs to be addressed in order to utilize TE technology for competitive, sustainable energy applications. Herein, we deposit a 200 nm-thick Zr-based thin-film metallic glass (TFMG), which acts as an effective diffusion barrier layer with low electrical contact resistivity, on a high-zT Se-doped AgSbTe2 substrate. The reaction couples structured with TFMG/TE are annealed at 673 K for 8-360 hours and analyzed by electron microscopy...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28324929/hyperthermia-by-electromagnetic-fields-to-enhanced-clinical-results-in-oncology
#4
Gerard C van Rhoon, Maarten M Paulides, Jeannette M L van Holthe, Martine Franckena
Confining treatment to the tumor to improve therapeutic outcome and reduce toxicity, is a hot issue in cancer research. Hyperthermia is recognized as a strong sensitizer for radiotherapy and chemotherapy enhancing tumor control without increasing toxicity. Today's electromagnetic hyperthermia systems heat large tissue volumes with limited ability to selectively heat the tumor. Fortunately, tremendous improvements in 3-dimensional electromagnetic & temperature modelling provide an exciting opportunity to design advanced multi-element electromagnetic applicator systems...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28315990/model-based-registration-of-preprocedure-mr-and-intraprocedure-us-of-the-lumbar-spine
#5
Delaram Behnami, Alireza Sedghi, Emran Mohammad Abu Anas, Abtin Rasoulian, Alexander Seitel, Victoria Lessoway, Tamas Ungi, David Yen, Jill Osborn, Parvin Mousavi, Robert Rohling, Purang Abolmaesumi
PURPOSE: Epidural and spinal needle insertions, as well as facet joint denervation and injections are widely performed procedures on the lumbar spine for delivering anesthesia and analgesia. Ultrasound (US)-based approaches have gained popularity for accurate needle placement, as they use a non-ionizing, inexpensive and accessible modality for guiding these procedures. However, due to the inherent difficulties in interpreting spinal US, they yet to become the clinical standard-of-care...
March 18, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28298784/ventilation-of-nonparalyzed-patients-under-anesthesia-with-laryngeal-mask-airway-comparison-of-three-modes-of-ventilation-volume-controlled-ventilation-pressure-controlled-ventilation-and-pressure-controlled-ventilation-volume-guarantee
#6
Maroun Badwi Ghabach, Elie M El Hajj, Rouba D El Dib, Jeanette M Rkaiby, May S Matta, May R Helou
BACKGROUND: Pressure controlled ventilation (PCV) is the preferable mode of ventilation of nonparalyzed patients undergoing anesthesia with laryngeal mask airway (LMA) as compared to volume controlled ventilation (VCV) and spontaneously breathing patient. In this study, we compared the PC-volume guarantee (PC-VG) mode of ventilation with VCV and PCV modes. MATERIALS AND METHODS: A total of 30 patients, American Society of Anesthesiologists (ASA) physical status Classes I and II, scheduled for elective surgery under general anesthesia with a classic LMA were ventilated, subsequently, with the three modes of ventilation: VCV, PCV, and PC-VG for 10 min each mode...
January 2017: Anesthesia, Essays and Researches
https://www.readbyqxmd.com/read/28296311/analysis-of-setup-error-based-on-ctvision-for-nasopharyngeal-carcinoma-during-igrt
#7
Shuxu Zhang, Xiang Zhou, Quanbin Zhang, Shaohui Jiang, Ruihao Wang, Guoqian Zhang, Huaiyu Lei, Shengqu Lin
The aim of the present study was to investigate the role of CTVision in interfractional setup errors during intensity-modulated radiation therapy (IMRT) in 12 nasopharyngeal carcinoma (NPC) patients. The trend of setup errors as a function of time during a fractionated radiotherapy course was investigated, and the influence of reconstructive thickness on image reconstruction for setup errors was analyzed. The appropriate planning target volume (PTV) margin and planning risk volume (PRV) margin were defined to provide a reference for the design of IMRT for NPC...
July 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28266834/direct-probing-of-the-dielectric-scavenging-layer-interface-in-oxide-filamentary-based-valence-change-memory
#8
Umberto Celano, Jonathan Op de Beeck, Sergiu Clima, Michael Lübben, Paul M Koenraad, Ludovic Goux, Ilia Valov, Wilfried Vandervorst
A great improvement in valence change memory performance has been recently achieved by adding another metallic layer to the simple metal-insulator-metal (MIM) structure. This metal layer is often referred to as oxygen exchange layer (OEL) and is introduced between one of the electrodes and the oxide. The OEL is believed to induce a distributed reservoir of defects at the metal-insulator interface thus providing an unlimited availability of building blocks for the conductive filament (CF). However, its role remains elusive and controversial owing to the difficulties to probe the interface between the OEL and the CF...
March 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28249595/non-contact-synchronous-dynamic-measurement-of-respiratory-rate-and-heart-rate-based-on-dual-sensitive-regions
#9
Bing Wei, Xuan He, Chao Zhang, Xiaopei Wu
BACKGROUND: Currently, many imaging photoplethysmography (IPPG) researches have reported non-contact measurements of physiological parameters, such as heart rate (HR), respiratory rate (RR), etc. However, it is accepted that only HR measurement has been mature for applications, and other estimations are relatively incapable for reliable applications. Thus, it is worth keeping on persistent studies. Besides, there are some issues commonly involved in these approaches need to be explored further...
January 17, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28242283/blood-venous-sample-collection-recommendations-overview-and-a-checklist-to-improve-quality
#10
REVIEW
Davide Giavarina, Giuseppe Lippi
The extra-analytical phases of the total testing process have substantial impact on managed care, as well as an inherent high risk of vulnerability to errors which is often greater than that of the analytical phase. The collection of biological samples is a crucial preanalytical activity. Problems or errors occurring shortly before, or soon after, this preanalytical step may impair sample quality and characteristics, or else modify the final results of testing. The standardization of fasting requirements, rest, patient position and psychological state of the patient are therefore crucial for mitigating the impact of preanalytical variability...
February 25, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28226512/hyperthermia-by-electromagnetic-fields-to-enhanced-clinical-results-in-oncology
#11
Gerard C van Rhoon, Maarten M Paulides, Jeannette M L van Holthe, Martine Franckena, Gerard C van Rhoon, Maarten M Paulides, Jeannette M L van Holthe, Martine Franckena, Maarten M Paulides, Martine Franckena, Gerard C van Rhoon, Jeannette M L van Holthe
Confining treatment to the tumor to improve therapeutic outcome and reduce toxicity, is a hot issue in cancer research. Hyperthermia is recognized as a strong sensitizer for radiotherapy and chemotherapy enhancing tumor control without increasing toxicity. Today's electromagnetic hyperthermia systems heat large tissue volumes with limited ability to selectively heat the tumor. Fortunately, tremendous improvements in 3-dimensional electromagnetic & temperature modelling provide an exciting opportunity to design advanced multi-element electromagnetic applicator systems...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28167246/performance-specifications-for-the-extra-analytical-phases-of-laboratory-testing-why-and-how
#12
REVIEW
Mario Plebani
An important priority in the current healthcare scenario should be to address errors in laboratory testing, which account for a significant proportion of diagnostic errors. Efforts made in laboratory medicine to enhance the diagnostic process have been directed toward improving technology, greater volumes and more accurate laboratory tests being achieved, but data collected in the last few years highlight the need to re-evaluate the total testing process (TTP) as the unique framework for improving quality and patient safety...
February 4, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28152477/anatomic-trisegmentectomy-an-alternative-treatment-for-huge-or-multiple-hepatocellular-carcinoma-of-right-liver
#13
Changku Jia, Jie Weng, Qifan Qin, Youke Chen, Xiaolong Huang, Yu Fu
BACKGROUND: The patients with huge (≥10cm) or multiple hepatocellular carcinoma (HCC) in the right liver and insufficient size of the remnant left liver can not be performed an operation of right hemihepatectomy because of that liver failure will occur post operation. We designed anatomic trisegmentectomy in right liver to increase the ratio of future liver remnant volume (%FLRV), thus increasing resectability of huge or multiple HCC. METHODS: Thirteen patients were analyzed by preoperative CT scan for liver and tumor volumetries...
April 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28103903/intraoperative-radiotherapy-iort-as-boost-in-breast-cancer
#14
REVIEW
Felix Sedlmayer, Roland Reitsamer, Frederik Wenz, Elena Sperk, Christoph Fussl, Julia Kaiser, Ingrid Ziegler, Franz Zehentmayr, Heinz Deutschmann, Peter Kopp, Gerd Fastner
The term IORT (intraoperative radiotherapy) is currently used for various techniques that show huge differences in dose delivery and coverage of the tissue at risk. The largest evidence for boost IORT preceding whole breast irradiation (WBI) originates from intraoperative electron treatments (IOERT) with single doses around 10 Gy. At median follow-up periods at 6 years, outstandingly low local recurrence rates of less than 1% are observed. Higher local relapse rates were described for G3 tumors and triple negative breast cancers as well as for IORT following primary systemic treatment for locally advanced tumors...
January 19, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28070841/reproducibility-of-dynamic-contrast-enhanced-mri-and-dynamic-susceptibility-contrast-mri-in-the-study-of-brain-gliomas-a-comparison-of-data-obtained-using-different-commercial-software
#15
Gian Marco Conte, Antonella Castellano, Luisa Altabella, Antonella Iadanza, Marcello Cadioli, Andrea Falini, Nicoletta Anzalone
PURPOSE: Dynamic susceptibility contrast MRI (DSC) and dynamic contrast-enhanced MRI (DCE) are useful tools in the diagnosis and follow-up of brain gliomas; nevertheless, both techniques leave the open issue of data reproducibility. We evaluated the reproducibility of data obtained using two different commercial software for perfusion maps calculation and analysis, as one of the potential sources of variability can be the software itself. METHODS: DSC and DCE analyses from 20 patients with gliomas were tested for both the intrasoftware (as intraobserver and interobserver reproducibility) and the intersoftware reproducibility, as well as the impact of different postprocessing choices [vascular input function (VIF) selection and deconvolution algorithms] on the quantification of perfusion biomarkers plasma volume (Vp), volume transfer constant (K (trans)) and rCBV...
April 2017: La Radiologia Medica
https://www.readbyqxmd.com/read/28047361/su-f-t-157-physics-considerations-regarding-dosimetric-accuracy-of-analytical-dose-calculations-for-small-field-proton-therapy-a-monte-carlo-study
#16
C Geng, J Daartz, K Cheung, M Bussiere, H Shih, H Paganetti, J Schuemann
PURPOSE: To evaluate the accuracy of dose calculations by analytical dose calculation methods (ADC) for small field proton therapy in a gantry based passive scattering facility. METHODS: 50 patients with intra-cranial disease were evaluated in the study. Treatment plans followed standard prescription and optimization procedures of proton stereotactic radiosurgery. Dose distributions calculated with the Monte Carlo (MC) toolkit TOPAS were used to represent delivered treatments...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047171/we-ab-207b-03-a-computational-methodology-for-determination-of-ctv-to-ptv-margins-with-inter-fractional-shape-variations-based-on-a-statistical-point-distribution-model-for-prostate-cancer-radiation-therapy
#17
Y Shibayama, H Arimura, T Hirose, K Nakamura, T Sasaki, S Ohga, Y Umezu, Y Nakamura, H Honda
PURPOSE: Our assumption was that interfractional shape variations of target volumes could not be negligible for determination of clinical target volume (CTV)-to-planning target volume (PTV) margins. The aim of this study was to investigate this assumption as a simulation study by developing a computational framework of CTV-to-PTV margins with taking the interfractional shape variations into account based on point distribution model (PDM) METHODS: The systematic and random errors for interfractional shape variations and translations of target volumes were evaluated for four types of CTV regions (only a prostate, a prostate plus proximal 1-cm seminal vesicles, a prostate plus proximal 2-cm seminal vesicles, and a prostate plus whole seminal vesicles)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046451/th-cd-209-04-fuzzy-robust-optimization-in-intensity-modulated-proton-therapy-planning-to-account-for-range-and-patient-setup-uncertainties
#18
Y An, M Bues, S Schild, W Liu
PURPOSE: We propose to apply a robust optimization model based on fuzzy-logic constraints in the intensity-modulated proton therapy (IMPT) planning subject to range and patient setup uncertainties. The purpose is to ensure the plan robustness under uncertainty and obtain the best trade-off between tumor dose coverage and organ-at-risk(OAR) sparing. METHODS: Two IMPT plans were generated for 3 head-and-neck cancer patients: one used the planning target volume(PTV) method; the other used the fuzzy robust optimization method...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28044238/vaporize-anatomically-vaporize-or-enucleate-the-prostate-the-flexible-use-of-the-greenlight-laser
#19
Luca Cindolo, Lorenzo Ruggera, Paolo Destefanis, Claudio Dadone, Giovanni Ferrari
PURPOSES: GreenLight laser has gained increasing acceptance as a less invasive treatment for lower urinary tract symptoms due to benign prostatic hyperplasia (BPH/LUTS). Three surgical options were developed: standard photovaporization (PVP), anatomical PVP and GreenLight enucleation of prostate (GreenLEP); however, literature lacks a direct comparison among the procedures. Aim of the present study is to compare the three techniques in a multicentre series of patients. METHODS: Data were collected from consecutive patients with indication to surgical management of BPH/LUTS in five institutions...
January 2, 2017: International Urology and Nephrology
https://www.readbyqxmd.com/read/28034614/system-dynamics-applied-to-closed-loop-supply-chains-of-desktops-and-laptops-in-brazil-a-perspective-for-social-inclusion-of-waste-pickers
#20
Verônica Ghisolfi, Gisele de Lorena Diniz Chaves, Renato Ribeiro Siman, Lúcia Helena Xavier
The structure of reverse logistics for waste electrical and electronic equipment (WEEE) is essential to minimize the impacts of their improper disposal. In this context, the Brazilian Solid Waste Policy (BSWP) was a regulatory milestone in Brazil, submitting WEEE to the mandatory implementation of reverse logistics systems, involving the integration of waste pickers on the shared responsibility for the life cycle of products. This article aims to measure the impact of such legal incentives and the bargaining power obtained by the volume of collected waste on the effective formalization of waste pickers...
December 26, 2016: Waste Management
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