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Radiation physics

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https://www.readbyqxmd.com/read/28531942/target-signalling-pathways-of-natural-plant-derived-radioprotective-agents-from-treatment-to-potential-candidates-a-reverse-thought-on-anti-tumour-drugs
#1
REVIEW
Ke-Li Yun, Zhen Yu Wang
Radiation damage can occur in nuclear power plant workers when physical protections fail, which results in nuclear leakage through the protective layers. Alternatively, workers may be unable to use physical protection in time (in the case of a sudden nuclear weapons attack). In addition, patients who receive local radiotherapy and are not allowed to adopt local physical protection may experience radiation damage. Thus, protection against chemical radiation has become indispensable. In view of the side effects caused by synthetic radioprotective agents (such as amisfostine), searching for radioprotective agents from plant sources is an alternative strategy...
May 17, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28529251/image-quality-and-clinical-usefulness-of-ray-summation-image-reconstructed-from-ct-data-compared-with-digital-radiography
#2
Shogo Suzuki, Katsuhiro Ichikawa, Shigeru Tamaki
Ray-summation (raysum) images reconstructed from computed tomography (CT) volume data resemble digital radiography (DR) images. Therefore, they have a potential to be used instead of DR images.The aim of this study was to compare the physical image quality evaluated by signal-difference-to-noise ratio (SDNR) and clinical usefulness between raysum and DR images. We employed an oval water phantom simulating adult abdomen for image quality measurement. Raysum images were reconstructed from CT volume data using an assumed x-ray quality of 70 keV...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28528679/evidence-based-peer-review-for-radiation-therapy-updated-review-of-the-literature-with-a-focus-on-tumour-subsite-and-treatment-modality
#3
M Huo, P Gorayski, M Poulsen, K Thompson, M B Pinkham
Technological advances in radiation therapy permit steep dose gradients from the target to spare normal tissue, but increase the risk of geographic miss. Suboptimal target delineation adversely affects clinical outcomes. Prospective peer review is a method for quality assurance of oncologists' radiotherapy plans. Published surveys suggest it is widely implemented. However, it may not be feasible to review every case before commencement of radiation therapy in all departments. The rate of plan changes following peer review of cases without a specific subsite or modality is typically around 10%...
May 18, 2017: Clinical Oncology: a Journal of the Royal College of Radiologists
https://www.readbyqxmd.com/read/28528368/preparation-of-allogeneic-bone-for-alveolar-ridge-augmentation
#4
Kornel Krasny, Artur Kamiński, Marta Krasny, Tomasz Czech, Andrzej Wojtowicz
Implant treatment is safe and predictable with sufficient amount and quality of bone tissue. In case of severely reduced bone tissue after a tooth was lost, augmentation of such tissue is necessary before implant embedment. Retrospective evaluation covered 380 alveolar ridge reconstructions. The study material consisted of human grafts prepared by the Department of Transplantology and Central Tissue Bank, Medical University of Warsaw. Presentation of laboratory procedures in the context of physical parameters of frozen, radiation sterilised, allogeneic corticocancellous material was presented...
May 20, 2017: Cell and Tissue Banking
https://www.readbyqxmd.com/read/28522398/study-on-the-synthesis-and-physicochemical-properties-of-starch-acetate-with-low-substitution-under-microwave-assistance
#5
Derong Lin, Wei Zhou, Jingjing Zhao, Weijie Lan, Rongming Chen, Yutong Li, Baoshan Xing, Zhuohao Li, Mengshi Xiao, Zhijun Wu, Xindan Li, Rongna Chen, Xingwen Zhang, Hong Chen, Qing Zhang, Wen Qin, Suqing Li
In this study, synthesis and physicochemical properties of starch acetate with low substitution under microwave were studied. A three-level-three-factorial Central Composite Design using Response Surface Methodology was employed to optimize the reaction conditions. The optimal parameters are as follows: amount of acetic anhydride of 12%, radiation time of 11min, and microwave power of 100W. These optimal conditions predicted by RSM were confirmed that the degree of substitution (DS) of acetate starch is 0.0691mg/g and the physical and chemical properties of natural corn starch (NCS) and corn starch acetate (ACS) were further studied...
May 15, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28516353/physical-hazard-safety-awareness-among-healthcare-workers-in-tanta-university-hospitals-egypt
#6
Rania M El-Sallamy, Ibrahim Ali Kabbash, Sanaa Abd El-Fatah, Asmaa El-Feky
Hospital workers are exposed to many occupational hazards that may threaten their health and safety. Physical hazards encountered in hospital working environment include temperature, illumination, noise, electrical injuries, and radiation. To assess the awareness of healthcare workers (HCWs) about physical hazards in Tanta university hospitals, this cross-sectional study included 401 HCWs (physicians, nurses, technicians, and workers) from seven departments (general surgery, orthopedics, radiology, ophthalmology, kitchen, incinerator, and laundry)...
May 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28514511/experiences-of-xerostomia-after-radiotherapy-in-patients-with-head-and-neck-cancer-a-qualitative-study
#7
Nan Jiang, Yue Zhao, Henrik Jansson, Xiaocen Chen, Jan Mårtensson
AIMS AND OBJECTIVES: The aim of this qualitative study was to describe the experiences of radiation-induced xerostomia in patients with head and neck cancer. BACKGROUND: Xerostomia is the most commonly occurring complication during and following radiotherapy. It can persist for several months or years and can have a significant impact on patients' quality of life. DESIGN: This was a qualitative descriptive study. METHODS: Semi-structured interviews were conducted with a sample of twenty participants...
May 17, 2017: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/28514220/case-242-radiation-induced-angiosarcoma
#8
Meredith Disharoon, Kamilia F Kozlowski, Jessica M Kaniowski
History In 2004, this woman received a diagnosis of invasive mammillary carcinoma, tubular variant, strongly positive for estrogen and progesterone receptors. Her lesion was found at screening mammography performed at an outside institution when she was 59 years old. She underwent partial mastectomy, with partial axillary node dissection and sentinel node mapping. A 0.6 × 0.5 cm Nottingham grade 1 infiltrating ductal carcinoma was removed from the right upper outer quadrant, margins were free of tumor, and there was no angiolymphatic invasion...
June 2017: Radiology
https://www.readbyqxmd.com/read/28514021/an-update-systematic-review-of-fetal-death-congenital-anomalies-and-fertility-disorders-among-health-care-workers
#9
REVIEW
Charline Warembourg, Sylvaine Cordier, Ronan Garlantézec
BACKGROUND: Health care workers (HCWs) are occupationally exposed to various hazards, some associated with adverse pregnancy outcomes in previous reviews. This systematic review aims at synthesizing the recent literature on occupational exposures among HCWs related to fetal death, congenital anomalies, and fertility disorders. METHODS: We searched the Medline database from 2000 to 2015 for articles about all potential occupational exposures of women and men working in this sector...
June 2017: American Journal of Industrial Medicine
https://www.readbyqxmd.com/read/28513524/ureterolithiasis-management-in-an-environment-with-limited-facilities
#10
C A Odoemene, Pcn Okere, M C Ugonabo
BACKGROUND: In the past 2-3 decades, there has been a dramatic development in the techniques of stone removal. This study highlights the management of symptomatic ureteral stones in an environment without such facilities. MATERIALS AND METHODS: Sixty-nine patients, comprising 53 (76.8%) males and 16 (23.2%) females, diagnosed of symptomatic ureteric calculi within the study period in two tertiary health institutions were included in the study. Thorough history taking and physical examinations were performed...
May 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28512330/direct-evaluation-of-influence-of-electron-damage-on-the-subcell-performance-in-triple-junction-solar-cells-using-photoluminescence-decays
#11
David M Tex, Tetsuya Nakamura, Mitsuru Imaizumi, Takeshi Ohshima, Yoshihiko Kanemitsu
Tandem solar cells are suited for space applications due to their high performance, but also have to be designed in such a way to minimize influence of degradation by the high energy particle flux in space. The analysis of the subcell performance is crucial to understand the device physics and achieve optimized designs of tandem solar cells. Here, the radiation-induced damage of inverted grown InGaP/GaAs/InGaAs triple-junction solar cells for various electron fluences are characterized using conventional current-voltage (I-V) measurements and time-resolved photoluminescence (PL)...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28508844/evaluation-of-the-effect-of-temperature-variation-on-response-of-presage%C3%A2-dosimeter
#12
Bagher Farhood, Davood Khezerloo, Tohid Morteza Zadeh, Hassan Ali Nedaie, Daryoosh Hamrahi, Najimeh Khezerloo
INTRODUCTION: Many factors, such as PRESAGE ® composition, dose rate, energy, and type of radiation, temperature, etc., may effect on PRESAGE ® dosimeter response. The aim of this study was investigating the effect of temperature variation on response of PRESAGE ® solid dosimeter. MATERIALS AND METHODS: In this study, a PRESAGE ® solid detector was fabricated. Ninety-four percent weight polyurethane, 5% weight carbon tetrachloride, and 1% weight leucomalachite green were used...
January 2017: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28508129/development-and-characterization-of-magnetite-poly-butylcyanoacrylate-nanoparticles-for-magnetic-targeted-delivery-of-cancer-drugs
#13
Margarita López-Viota, Mazen M El-Hammadi, Laura Cabeza, José Prados, Consolación Melguizo, M Adolfina Ruiz Martinez, José L Arias, Ángel V Delgado
A great attention is presently paid to the design of drug delivery vehicles based on surface-modified magnetic nanoparticles. They can, in principle, be directed to a desired target area for releasing their drug payload, a process triggered by pH, temperature, radiation, or even magnetic field. To this, the possibility of forming part of diagnostic tools by enhanced magnetic resonance imaging or that of further treatment by magnetic hyperthermia can be added. Bare particles are rapidly eliminated from the bloodstream by the phagocyte mononuclear system, leading to short biological half-life...
May 15, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28507460/validation-of-the-liver-mean-dose-in-terms-of-the-biological-effective-dose-for-the-prevention-of-radiation-induced-liver-damage
#14
Hiroshi Doi, Norihisa Masai, Kenji Uemoto, Osamu Suzuki, Hiroya Shiomi, Daisaku Tatsumi, Ryoong-Jin Oh
AIM: The purpose of this study was to determine the optimal mean liver biologically effective dose (BED) to prevent radiation-induced liver disease (RILD) in stereotactic body radiation therapy (SBRT). BACKGROUND: The actual mean doses appropriate for liver irradiation in modern radiotherapy techniques have not been adequately investigated, although SBRT is sometimes alternatively performed using fractionated regimens. MATERIALS AND METHODS: SBRT treatment plans for liver tumors in 50 patients were analyzed...
July 2017: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/28505478/dose-assessment-in-environmental-radiological-protection-state-of-the-art-and-perspectives
#15
REVIEW
Karolina Stark, José M Goméz-Ros, Jordi Vives I Batlle, Elisabeth Lindbo Hansen, Karine Beaugelin-Seiller, Lawrence A Kapustka, Michael D Wood, Clare Bradshaw, Almudena Real, Corynne McGuire, Thomas G Hinton
Exposure to radiation is a potential hazard to humans and the environment. The Fukushima accident reminded the world of the importance of a reliable risk management system that incorporates the dose received from radiation exposures. The dose to humans from exposure to radiation can be quantified using a well-defined system; its environmental equivalent, however, is still in a developmental state. Additionally, the results of several papers published over the last decade have been criticized because of poor dosimetry...
May 12, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28504268/observation-of-the-universal-magnetoelectric-effect-in-a-3d-topological-insulator
#16
V Dziom, A Shuvaev, A Pimenov, G V Astakhov, C Ames, K Bendias, J Böttcher, G Tkachov, E M Hankiewicz, C Brüne, H Buhmann, L W Molenkamp
The electrodynamics of topological insulators (TIs) is described by modified Maxwell's equations, which contain additional terms that couple an electric field to a magnetization and a magnetic field to a polarization of the medium, such that the coupling coefficient is quantized in odd multiples of α/4π per surface. Here we report on the observation of this so-called topological magnetoelectric effect. We use monochromatic terahertz (THz) spectroscopy of TI structures equipped with a semitransparent gate to selectively address surface states...
May 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28503964/recent-advances-in-intensity-modulated-radiotherapy-and-proton-therapy-for-esophageal-cancer
#17
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/28499627/clinical-application-of-moskin-dosimeters-to-rectal-wall-in-vivo-dosimetry-in-gynecological-hdr-brachytherapy
#18
M Carrara, A Romanyukha, C Tenconi, D Mazzeo, A Cerrotta, M Borroni, D Cutajar, M Petasecca, M Lerch, J Bucci, A Richetti, S Presilla, C Fallai, G Gambarini, E Pignoli, A Rosenfeld
PURPOSE: Three MOSkins dosimeters were assembled over a rectal probe and used to perform in vivo dosimetry during HDR brachytherapy treatments of vaginal cancer. The purpose of this study was to verify the applicability of the developed tool to evaluate discrepancies between planned and measured doses to the rectal wall. MATERIALS AND METHODS: MOSkin dosimeters from the Centre for Medical Radiation Physics are particularly suitable for brachytherapy procedures for their ability to be easily incorporated into treatment instrumentation...
May 9, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28499578/building-a-biomimetic-membrane-for-neutron-reflectivity-investigation-complexity-asymmetry-and-contrast
#19
Valeria Rondelli, Paola Brocca, Nicola Tranquilli, Giovanna Fragneto, Elena Del Favero, Laura Cantù
The preparation and investigation of model membranes is deserving growing interest both for the physics of complex systems, and for biology. The need of simplified models should preserve mimicking the qualifying characteristics of biological membranes, and keep non-invasive and detailed description. As a main feature, biological membranes are non-homogeneous in the disposition of components, both in the lateral and in the transverse direction. We prepared asymmetric supported membranes containing GM1 ganglioside in biomimetic proportion according to different protocols...
April 29, 2017: Biophysical Chemistry
https://www.readbyqxmd.com/read/28497529/aapm-medical-physics-practice-guideline-6-a-performance-characteristics-of-radiation-dose-index-monitoring-systems
#20
Dustin A Gress, Renee L Dickinson, William D Erwin, David W Jordan, Robert J Kobistek, Donna M Stevens, Mark P Supanich, Jia Wang, Lynne A Fairobent
The American Association of Physicists in Medicine (AAPM) is a nonprofit professional society whose primary purposes are to advance the science, education and professional practice of medical physics. The AAPM has more than 8,000 members and is the principal organization of medical physicists in the United States. The AAPM will periodically define new practice guidelines for medical physics practice to help advance the science of medical physics and to improve the quality of service to patients throughout the United States...
May 12, 2017: Journal of Applied Clinical Medical Physics
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