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ionizing radiation exposure

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https://www.readbyqxmd.com/read/28077626/low-dose-or-low-dose-rate-ionizing-radiation-induced-bioeffects-in-animal-models
#1
REVIEW
Feng Ru Tang, Weng Keong Loke, Boo Cheong Khoo
Animal experimental studies indicate that acute or chronic low-dose ionizing radiation (LDIR) (≤100 mSv) or low-dose-rate ionizing radiation (LDRIR) (<6 mSv/h) exposures may be harmful. It induces genetic and epigenetic changes and is associated with a range of physiological disturbances that includes altered immune system, abnormal brain development with resultant cognitive impairment, cataractogenesis, abnormal embryonic development, circulatory diseases, weight gain, premature menopause in female animals, tumorigenesis and shortened lifespan...
January 10, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28076617/radiation-exposure-in-endovascular-infra-renal-aortic-aneurysm-repair-and-factors-that-influence-it
#2
Rui Machado, Vitor Miguel Dias Ferreira, Luis Loureiro, João Gonçalves, Pedro Oliveira, Rui Almeida
Objective: The endovascular repair of aortic abdominal aneurysms exposes the patients and surgical team to ionizing radiation with risk of direct tissue damage and induction of gene mutation. This study aims to describe our standard of radiation exposure in endovascular aortic aneurysm repair and the factors that influence it. Methods: Retrospective analysis of a prospective database of patients with abdominal infra-renal aortic aneurysms submitted to endovascular repair...
November 2016: Brazilian Journal of Cardiovascular Surgery
https://www.readbyqxmd.com/read/28073208/experience-of-percutaneous-access-under-ultrasound-guidance-in-renal-transplant-patients-with-allograft-lithiasis
#3
Silvano Palazzo, Ottavio Colamonico, Saverio Forte, Matteo Matera, Giuseppe Lucarelli, Pasquale Ditonno, Michele Battaglia, Pasquale Martino
OBJECTIVE: Urolithiasis of the transplanted kidney has an incidence of 0.2 to 1.7%, it increases the risk of infection in immunosuppressed patients and it can lead to ureteral obstruction that is often associated with deterioration of renal function. Urolithiasis of the transplanted kidney has different characteristics compared to the native kidney, due to the absence of innervation, which does not lead to colic pain. Percutaneous approach is an optimal choice in transplant patients. MATERIAL AND METHODS: Here we report our experience in two cadaveric transplant patients with urolithiasis...
December 30, 2016: Archivio Italiano di Urologia, Andrologia
https://www.readbyqxmd.com/read/28072673/the-use-of-ultrasound-measured-optic-nerve-sheath-diameter-to-predict-ventriculoperitoneal-shunt-failure-in-children
#4
Sophia D Lin, Kimberly R Kahne, Amira El Sherif, Kevin Mennitt, David Kessler, Mary J Ward, Shari L Platt
OBJECTIVE: The goal of this study was to assess the accuracy of ultrasound-measured optic nerve sheath diameter (ONSD) as a screen for ventriculoperitoneal shunt failure. METHODS: We prospectively enrolled a convenience sample of children presenting to the ED with suspected shunt failure. The ONSD was measured by ultrasound and compared with computed tomography/magnetic resonance imaging (CT/MRI) and neurosurgical impression. We defined shunt failure on ultrasound as an ONSD greater than 4...
January 9, 2017: Pediatric Emergency Care
https://www.readbyqxmd.com/read/28072563/inefficiencies-in-computed-tomography-sinus-imaging-for-management-of-sinonasal-disease
#5
Giriraj K Sharma, Allen Foulad, David Shamouelian, Naveen D Bhandarkar
Objective A subset of patients with sinonasal disease who obtain a diagnostic computed tomography (CT) sinus scan may require repeat preoperative CT due to the inadequacy of diagnostic CT for image-guided sinus surgery (IGSS). This leads to increased CT utilization, health care costs, and patient exposure to ionizing radiation. The objective of this study is to determine the frequencies of diagnostic CT sinus studies that were inadequate for IGSS and repeat CT studies for purposes of IGSS. Study Design A retrospective chart study was performed between May 2012 and August 2013...
January 1, 2017: Otolaryngology—Head and Neck Surgery
https://www.readbyqxmd.com/read/28070242/computed-tomography-and-patient-risk-facts-perceptions-and-uncertainties
#6
REVIEW
Stephen P Power, Fiachra Moloney, Maria Twomey, Karl James, Owen J O'Connor, Michael M Maher
Since its introduction in the 1970s, computed tomography (CT) has revolutionized diagnostic decision-making. One of the major concerns associated with the widespread use of CT is the associated increased radiation exposure incurred by patients. The link between ionizing radiation and the subsequent development of neoplasia has been largely based on extrapolating data from studies of survivors of the atomic bombs dropped in Japan in 1945 and on assessments of the increased relative risk of neoplasia in those occupationally exposed to radiation within the nuclear industry...
December 28, 2016: World Journal of Radiology
https://www.readbyqxmd.com/read/28067089/metabolomic-applications-in-radiation-biodosimetry-exploring-radiation-effects-through-small-molecules
#7
Evan L Pannkuk, Albert J Fornace, Evagelia C Laiakis
PURPOSE: Exposure of the general population to ionizing radiation has increased in the past decades, primarily due to long distance travel and medical procedures. On the other hand, accidental exposures, nuclear accidents, and elevated threats of terrorism with the potential detonation of a radiological dispersal device or improvised nuclear device in a major city, all have led to increased needs for rapid biodosimetry and assessment of exposure to different radiation qualities and scenarios...
January 9, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/28057600/formation-and-repair-of-oxidatively-generated-damage-in-cellular-dna
#8
Jean Cadet, Kelvin J A Davies, Marisa Hg Medeiros, Paolo Di Mascio, J Richard Wagner
In this review article, emphasis is placed on the critical survey of available data concerning modified nucleobase and 2-deoxyribose products that have been identified in cellular DNA following exposure to a wide variety of oxidizing species and agents including, hydroxyl radical, one-electron oxidants, singlet oxygen, hypochlorous acid and ten-eleven translocation enzymes. In addition, information is provided about the generation of secondary oxidation products of 8-oxo-7,8-dihydroguanine and nucleobase addition products with reactive aldehydes arising from the decomposition of lipid peroxides...
January 2, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28057068/computed-tomography-guided-biopsies-in-children-accuracy-efficiency-and-dose-usage
#9
Tatjana Gruber-Rouh, Axel Thalhammer, Thomas Klingebiel, Nour-Eldin A Nour-Eldin, Thomas J Vogl, Katrin Eichler, Nagy Naguib, Martin Beeres
BACKGROUND: Computed-tomography-guided interventions are attractive for tissue sampling of paediatric tumor lesions; however, it comes with exposure to ionizing radiation. The aim of this study was to analyse the radiation dose, accuracy and speed of CT-guided interventions in paediatric patient cohort. METHODS: We retrospectively reviewed CT-guided interventions over a 10 -year period in 65 children. The intervention site consisted of bones in 38, chest (lung) in 15 and abdomen (liver, lymph nodes) in 12 cases...
January 6, 2017: Italian Journal of Pediatrics
https://www.readbyqxmd.com/read/28052939/no-association-between-radiation-dose-from-pediatric-ct-scans-and-risk-of-subsequent-hodgkin-lymphoma
#10
Amy Berrington de Gonzalez, Neige Journy, Choonsik Lee, Lindsay M Morton, Richard Harbron, Douglas R Stewart, Louise Parker, Alan W Craft, Kieran McHugh, Mark Little, Mark Pearce
BACKGROUND: We examined the relationship between estimated radiation dose from CT scans and subsequent Hodgkin lymphoma in the UK pediatric CT scans cohort. METHODS: A retrospective, record linkage cohort included patients aged 0-21 years who underwent CT scans between 1980 and 2002 and were followed up for cancer or death until 2008. Poisson regression analysis was used to evaluate the relationship between estimated radiation dose (lagged by two years) and incident Hodgkin lymphoma diagnosed at least two years after the first CT scan...
January 4, 2017: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/28048608/tu-e-tour-i-00-exhibit-hall-guided-tours-dosimters-for-qc-in-diagnostic-imaging-tuesday
#11
(no author information available yet)
: Tour Leader: Xia Jiang, Ohio State University, Columbus, OH Tour Guides: Xia Jiang, Ohio State University, Columbus, OH Kevin Little, The University of Chicago, Chicago, IL Christina Sammet, Lurie Children's Hospital of Chicago, Chicago, IL Participating Vendors: IBA PTW - New York Radcal Corporation RTI Electronics, Inc. Exhibit Hall Guided Tours is a new program launching this year at the Annual Meeting. The Guided Tours are designed to enhance the interaction between meeting attendees and exhibitors...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048432/we-c-tour-i-01-dosimters-for-qc-in-diagnostic-imaging
#12
X Jiang
: Tour Leader: Xia Jiang, Ohio State University, Columbus, OH Tour Guides: Xia Jiang, Ohio State University, Columbus, OH Kevin Little, The University of Chicago, Chicago, IL Adrien Sanchez, University of Chicago, Chicago, IL Participating Vendors: IBA PTW - New York Radcal Corporation RTI Electronics, Inc. Exhibit Hall Guided Tours is a new program launching this year at the Annual Meeting. The Guided Tours are designed to enhance the interaction between meeting attendees and exhibitors...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048347/th-cd-201-12-preliminary-evaluation-of-organic-field-effect-transistors-as-radiation-detectors
#13
A Syme, H Lin, J Rubio-Sanchez, D Perepichka
PURPOSE: To fabricate organic field effect transistors (OFETs) and evaluate their performance before and after exposure to ionizing radiation. To determine if OFETs have potential to function as radiation dosimeters. METHODS: OFETs were fabricated on both Si/SiO2 wafers and flexible polymer substrates using standard processing techniques. Pentacene was used as the organic semiconductor material and the devices were fabricated in a bottom gate configuration. Devices were irradiated using an orthovoltage treatment unit (120 kVp x-rays)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047940/tu-e-tour-i-01-dosimters-for-qc-in-diagnostic-imaging
#14
X Jiang
: Tour Leader: Xia Jiang, Ohio State University, Columbus, OH Tour Guides: Xia Jiang, Ohio State University, Columbus, OH Kevin Little, The University of Chicago, Chicago, IL Christina Sammet, Lurie Children's Hospital of Chicago, Chicago, IL Participating Vendors: IBA PTW - New York Radcal Corporation RTI Electronics, Inc. Exhibit Hall Guided Tours is a new program launching this year at the Annual Meeting. The Guided Tours are designed to enhance the interaction between meeting attendees and exhibitors...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047450/su-f-i-79-validation-of-a-monte-carlo-radiographic-simulation
#15
A Gearhart, D Carver, M Stabin
PURPOSE: To validate a radiographic simulation in order to estimate patient dose due to clinically-used radiography protocols. METHODS: A Monte Carlo simulation was created to simulate a radiographic x-ray beam using GEANT4. Initial validation was performed according to a portion of TG 195. Computational NURBS-based phantoms were used simulate patients of varying ages and sizes. The deposited energy in the phantom is output by the simulation. The exposure in air from a clinically used radiography unit was measured at 100 cm for various tube potentials...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046649/su-f-i-72-evaluation-of-the-ancillary-lead-shielding-for-optimizing-radiation-protection-in-the-interventional-radiology-department
#16
E Tonkopi, C Lightfoot, E LeBlanc
PURPOSE: The rising complexity of interventional fluoroscopic procedures has resulted in an increase of occupational radiation exposures in the interventional radiology (IR) department. This study assessed the impact of ancillary shielding on optimizing radiation protection for the IR staff. METHODS: Scattered radiation measurements were performed in two IR suites equipped with Axiom Artis systems (Siemens Healthcare, Erlangen, Germany) installed in 2006 and 2010...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046522/su-c-204-05-magnetic-resonance-induced-adaptive-response-to-orthovoltage-radiation-therapy-in-fsa-and-sa-nh-mouse-tumor-cell-lines
#17
K Mendel, R Miller, J Murley, M Sadinski, D Grdina
PURPOSE: To assess the effect of pre-treatment Magnetic Resonance Imaging (MRI) on cell survival following orthovoltage radiation therapy. METHODS: This in vitro study examined the survival of FSa cells (extracted from methylcholanthrene-induced fibrosarcoma in the flank of a C3H female mouse) and SA-NH cells (derived from a spontaneously arising murine sarcoma tumor) having undergone an MRI scan prior to radiation exposure. Cell cultures were kept at 37 C, in a humidified environment with 5% CO2, and were grown to confluence prior to the start of the experiment...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046356/we-c-tour-i-00-exhibit-hall-guided-tours-dosimters-for-qc-in-diagnostic-imaging-wednesday
#18
(no author information available yet)
: Tour Leader: Xia Jiang, Ohio State University, Columbus, OH Tour Guides: Xia Jiang, Ohio State University, Columbus, OH Kevin Little, The University of Chicago, Chicago, IL Adrien Sanchez, University of Chicago, Chicago, IL Participating Vendors: IBA PTW - New York Radcal Corporation RTI Electronics, Inc. Exhibit Hall Guided Tours is a new program launching this year at the Annual Meeting. The Guided Tours are designed to enhance the interaction between meeting attendees and exhibitors...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28045034/premature-senescence-of-endothelial-cells-upon-chronic-exposure-to-tnf%C3%AE-can-be-prevented-by-n-acetyl-cysteine-and-plumericin
#19
Shafaat Y Khan, Ezzat M Awad, Andre Oszwald, Manuel Mayr, Xiaoke Yin, Birgit Waltenberger, Hermann Stuppner, Markus Lipovac, Pavel Uhrin, Johannes M Breuss
Cellular senescence is characterized by a permanent cell-cycle arrest and a pro-inflammatory secretory phenotype, and can be induced by a variety of stimuli, including ionizing radiation, oxidative stress, and inflammation. In endothelial cells, this phenomenon might contribute to vascular disease. Plasma levels of the inflammatory cytokine tumor necrosis factor alpha (TNFα) are increased in age-related and chronic conditions such as atherosclerosis, rheumatoid arthritis, psoriasis, and Crohn's disease. Although TNFα is a known activator of the central inflammatory mediator NF-κB, and can induce the intracellular generation of reactive oxygen species (ROS), the question whether TNFα can induce senescence has not been answered conclusively...
January 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28038350/norm-contaminated-area-identification-using-radionuclides-activity-concentration-pattern-in-a-soil-profile
#20
Bogusław Michalik
According to the requirements set by European BSS the exposure of humans and biota to ionizing radiation originating from natural radionuclides but under anthropogenically changed conditions should be managed within the same regulatory framework as other practices. Such situation creates the strong needs to have a reliable method to distinguish whether the particular case of natural radioactivity occurrence has resulted from human activity or it is pure natural phenomenon. In case of current activity of particular NORM industry there are no doubts however, in case of a legacy site, such question becomes crucial...
December 27, 2016: Journal of Environmental Radioactivity
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