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ionizing radiation exposure

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https://www.readbyqxmd.com/read/28545190/radiation-exposure-in-patients-with-inflammatory-bowel-disease-a-fourteen-year-review-at-a-tertiary-care-centre-in-malaysia
#1
Jeevinesh Naidu, Zhiqin Wong, Shanthi Palaniappan, Chai Soon Ngiu, Raja Affendi Raja Ali
Background and Aims: Patients with inflammatory bowel disease (IBD) are subjected to a large amount of ionizing radiation during the course of their illness. This may increase their risk of malignancy to a greater level than that due to the disease itself. In Caucasian patients with Crohn’s disease, this has been well documented and recommendations are in place to avoid high radiation imaging protocols. However, there are limited data available on radiation exposure in Asian IBD patients.We therefore sought to identify total radiation exposure and any differences between ethnically diverse ulcerative colitis (UC) and Crohn’s disease (CD) patients at our centre along with determining factors that may contribute to any variation...
April 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28542368/in-vivo-and-in-vitro-characterization-of-ddrc-a-dna-damage-response-protein-in-deinococcus-radiodurans-bacterium
#2
Claire Bouthier de la Tour, Martine Mathieu, Laura Meyer, Pauline Dupaigne, Fanny Passot, Pascale Servant, Suzanne Sommer, Eric Le Cam, Fabrice Confalonieri
The bacterium Deinococcus radiodurans possesses a set of Deinococcus-specific genes highly induced after DNA damage. Among them, ddrC (dr0003) was recently re-annotated, found to be in the inverse orientation and called A2G07_00380. Here, we report the first in vivo and in vitro characterization of the corrected DdrC protein to better understand its function in irradiated cells. In vivo, the ΔddrC null mutant is sensitive to high doses of UV radiation and the ddrC deletion significantly increases UV-sensitivity of ΔuvrA or ΔuvsE mutant strains...
2017: PloS One
https://www.readbyqxmd.com/read/28542006/an-efficient-affordable-optically-stimulated-luminescent-osl-annealer
#3
Sara A Abraham, Samuel J Frank, Kimberlee J Kearfott
Optically stimulated luminescent (OSL) dosimeters are devices used for measuring doses of ionizing radiation. Signal is stored within an OSL material so that when stimulated with light, light of a specific wavelength is emitted in proportion to the integrated ionizing radiation dose. Each interrogation of the material results in the loss of a small fraction of signal, thus allowing multiple interrogations leading to more accurate measurements of dose. In order to reuse a dosimeter, the residual signals from prior doses must be taken into account and subtracted from current readings, adding uncertainty to any future measurements...
July 2017: Health Physics
https://www.readbyqxmd.com/read/28541775/cellular-response-to-exponentially-increasing-and-decreasing-dose-rates-implications-for-treatment-planning-in-targeted-radionuclide-therapy
#4
Jay H Solanki, Thomas Tritt, Jordan B Pasternack, Julia J Kim, Calvin N Leung, Jason D Domogauer, Nicholas W Colangelo, Venkat R Narra, Roger W Howell
The treatment of cancer using targeted radionuclide therapy is of interest to nuclear medicine and radiation oncology because of its potential for killing tumor cells while minimizing dose-limiting toxicities to normal tissue. The ionizing radiations emitted by radiopharmaceuticals deliver radiation absorbed doses over protracted periods of time with continuously varying dose rates. As targeted radionuclide therapy becomes a more prominent part of cancer therapy, accurate models for estimating the biologically effective dose (BED) or equieffective dose given in 2 fractions (EQD2α/β) will become essential for treatment planning...
May 25, 2017: Radiation Research
https://www.readbyqxmd.com/read/28534553/-ionizing-radiation-received-by-patients-with-osteosarcoma-during-intra-arterial-chemotherapy-treatment
#5
N Aznárez-Sanado, M Aznárez-Sanado, L Sierrasesúmaga, J I Bilbao, J M Martí-Climent, A Patiño-García
BACKGROUND: Osteosarcoma paediatric patients are usually treated with intra-arterial chemotherapy (QTia) which is admi-nistered directly to the tumour. This procedure exposes patients to ionizing radiation. Paediatric patients are especially sensitive to this exposure. METHODS: The total amount of ionizing radiation received from QTia administration was quantified in a group of 16 osteo-sarcoma paediatric patients from the Clínica Universidad de Navarra. RESULTS: The median of the total radiation received per patient was 33...
April 30, 2017: Anales del Sistema Sanitario de Navarra
https://www.readbyqxmd.com/read/28534063/-the-new-law-on-radiation-protection-as-a-consequence-of-the-eu-safety-standard-of-2013
#6
REVIEW
G Layer
The transformation of a European guideline (2013/59/Euratom) from 2013 into national law requires adaptation of the national statutory regulations. This year, all areas of protection from ionizing radiation will be subject to the new radiation protection law (StrlSchG). Through this, the German X‑ray and Radiation Protection Acts will be combined to form a higher level of authority. The main parts of the StrlSchG will receive a new classification and will be organized according to the exposure scenario: radiation protection in planned exposure scenarios, radiation protection in emergency exposure scenarios, radiation protection in existing exposure scenarios, and the regulation of overall exposure scenarios...
May 22, 2017: Der Radiologe
https://www.readbyqxmd.com/read/28532210/the-linear-nonthreshold-lnt-model-as-used-in-radiation-protection-an-ncrp-update
#7
John D Boice
Purpose/Objective(s): The linear non-threshold (LNT) model has been used in radiation protection for over 40 years and has been hotly debated! It relies heavily on human epidemiology, with support from radiobiology. The scientific underpinnings include NCRP Report No. 136 ("Evaluation of the Linear-Nonthreshold Dose-Response Model for Ionizing Radiation"), UNSCEAR 2000, ICRP Publication 99 (2004) and the National Academies BEIR VII Report (NRC 2006). NCRP Scientific Committee 1-25 is reviewing recent epidemiologic studies focusing on dose-response models, including threshold, and the relevance to radiation protection...
May 23, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/28529513/ionizing-radiation-induced-immune-and-inflammatory-reactions-in-the-brain
#8
REVIEW
Katalin Lumniczky, Tünde Szatmári, Géza Sáfrány
Radiation-induced late brain injury consisting of vascular abnormalities, demyelination, white matter necrosis, and cognitive impairment has been described in patients subjected to cranial radiotherapy for brain tumors. Accumulating evidence suggests that various degrees of cognitive deficit can develop after much lower doses of ionizing radiation, as well. The pathophysiological mechanisms underlying these alterations are not elucidated so far. A permanent deficit in neurogenesis, chronic microvascular alterations, and blood-brain barrier dysfunctionality are considered among the main causative factors...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28529208/long-term-cardiovascular-risk-after-radiotherapy-in-women-with-breast-cancer
#9
REVIEW
Yun-Jiu Cheng, Xiao-Ying Nie, Cheng-Cheng Ji, Xiao-Xiong Lin, Li-Juan Liu, Xu-Miao Chen, Hao Yao, Su-Hua Wu
BACKGROUND: Radiotherapy for breast cancer often involves some incidental exposure of the heart to ionizing radiation. The effect of this exposure on the subsequent risk of heart disease is uncertain. We performed a meta-analysis to investigate the link between radiotherapy and long-term cardiovascular morbidity and mortality in patients with breast cancer. METHODS AND RESULTS: We performed a literature search using MEDLINE (January 1966 to January 2015) and EMBASE (January 1980 to January 2015) with no restrictions...
May 21, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28527000/fluorescent-coelenteramide-containing-protein-as-a-color-bioindicator-for-low-dose-radiation-effects
#10
Alena S Petrova, Anna A Lukonina, Gennadii A Badun, Nadezhda S Kudryasheva
The study addresses the application of fluorescent coelenteramide-containing proteins as color bioindicators for radiotoxicity evaluation. Biological effects of chronic low-dose radiation are under investigation. Tritiated water (200 MBq/L) was used as a model source of low-intensive ionizing radiation of beta type. 'Discharged obelin,' product of bioluminescent reaction of marine coelenterate Obelia longissimi, was used as a representative of the coelenteramide-containing proteins. Coelenteramide, fluorophore of discharged obelin, is a photochemically active molecule; it produces fluorescence forms of different color...
May 19, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28523649/highly-sensitive-detection-of-ionizing-radiations-by-a-photoluminescent-uranyl-organic-framework
#11
Jian Xie, Yaxing Wang, Wei Liu, Xuemiao Yin, Lanhua Chen, Youming Zou, Juan Diwu, Zhifang Chai, Thomas E Albrecht-Schmitt, Guokui Liu, Shuao Wang
Precise detection of low-dose X- and γ-radiations remains a challenge and is particularly important for studying biological effects under low-dose ionizing radiation, safety control in medical radiation treatment, survey of environmental radiation background, and monitoring cosmic radiations. We report here a photoluminescent uranium organic framework, whose photoluminescence intensity can be accurately correlated with the exposure dose of X- or γ-radiations. This allows for precise and instant detection of ionizing radiations down to the level of 10(-4)  Gy, representing a significant improvement on the detection limit of approximately two orders of magnitude, compared to other chemical dosimeters reported up to now...
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28523373/role-of-sod-gene-in-response-to-static-magnetic-fields-in-pseudomonas-aeruginosa
#12
Raouia Hanini, Abdelwaheb Chatti, Selma Ben Ghorbel, Ahmed Landoulsi
The protective role of superoxide dismutase (SOD) against non-ionizing radiation such as static electromagnetic field (200 mT) has been studied in wild-type and mutant strain of Pseudomonas aeruginosa lacking cytosolic Mn-SOD (sodM), Fe-SOD (sodB), or both SODs (sodMB). Our results showed that inactivation of sodM and/or sodB genes increases the sensitivity of P. aeruginosa toward stress induced by the static magnetic field (200 mT). Furthermore, our results showed an enhancement of SOD, catalase, and peroxidases after exposure to the magnetic field...
May 18, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28520518/arrested-development-infantile-hemangioma-and-the-stem-cell-teratogenic-hypothesis
#13
Shaghayegh Harbi, Hannah Park, Michael Gregory, Peter Lopez, Luis Chiriboga, Paolo Mignatti
BACKGROUND: Early-life programming is defined by the adaptive changes made by the fetus in response to an adverse in utero environment. Infantile hemangioma (IH), a vascular anomaly, is the most common tumor of infancy. Here we take IH as the tumor model to propose the stem cell teratogenic hypothesis of tumorigenesis and the potential involvement of the immune system. OBJECTIVES: Teratogenic agents include chemicals, heavy metals, pathogens, and ionizing radiation...
May 18, 2017: Lymphatic Research and Biology
https://www.readbyqxmd.com/read/28514670/radiation-safety-in-children-with-congenital-and-acquired-heart-disease-a-scientific-position-statement-on-multimodality-dose-optimization-from-the-image-gently-alliance
#14
REVIEW
Kevin D Hill, Donald P Frush, B Kelly Han, Brian G Abbott, Aimee K Armstrong, Robert A DeKemp, Andrew C Glatz, S Bruce Greenberg, Alexander Sheldon Herbert, Henri Justino, Douglas Mah, Mahadevappa Mahesh, Cynthia K Rigsby, Timothy C Slesnick, Keith J Strauss, Sigal Trattner, Mohan N Viswanathan, Andrew J Einstein
There is a need for consensus recommendations for ionizing radiation dose optimization during multi-modality medical imaging in children with congenital and acquired heart disease (CAHD). These children often have complex diseases and may be exposed to a relatively high cumulative burden of ionizing radiation from medical imaging procedures including cardiac computed tomography, nuclear cardiology studies and fluoroscopically guided diagnostic and interventional catheterization and electrophysiology procedures...
May 17, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28514021/an-update-systematic-review-of-fetal-death-congenital-anomalies-and-fertility-disorders-among-health-care-workers
#15
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/28511303/-association-of-xrcc1-gene-polymorphism-and-low-dose-ionizing-radiation-with-peripheral-blood-lymphocyte-micronucleus
#16
F Yang, P Xiong, X L Yuan, C R Liu, L J Ran, Y Yang, J Y Li
Objective: To explore the effects of X-ray repair cross complementing gene 1 (XRCC1) polymorphism and low dose ionizing radiation exposure on radiology professionals' peripheral blood lymphocyte micronucleus. Methods: A matched case-control study was designed. From 2013 to 2015, 1 102 radiology professionals with micronucleus test rusults, and 45 cases with present micronucleus were enroled into case group. 180 diagnostic radiology technicians detecting no micronucleus were chosen as control group, cases and controls were 1∶4 mached on gender, age ≤40 or >40 years old...
March 20, 2017: Chinese Journal of Industrial Hygiene and Occupational Diseases
https://www.readbyqxmd.com/read/28501192/variability-of-fluorescence-spectra-of-coelenteramide-containing-proteins-as-a-basis-for-toxicity-monitoring
#17
Roza R Alieva, Nadezhda S Kudryasheva
Nowadays, physicochemical approach to understanding toxic effects remains underdeveloped. A proper development of such mode would be concerned with simplest bioassay systems. Coelenteramide-Containing Fluorescent Proteins (CLM-CFPs) can serve as proper tools for study primary physicochemical processes in organisms under external exposures. CLM-CFPs are products of bioluminescent reactions of marine coelenterates. As opposed to Green Fluorescent Proteins, the CLM-CFPs are not widely applied in biomedical research, and their potential as colored biomarkers is undervalued now...
August 1, 2017: Talanta
https://www.readbyqxmd.com/read/28494764/possible-benefits-of-tomato-juice-consumption-a-pilot-study-on-irradiated-human-lymphocytes-from-healthy-donors
#18
Ayumi Nakamura, Chieko Itaki, Ayako Saito, Toko Yonezawa, Koichi Aizawa, Ayumi Hirai, Hiroyuki Suganuma, Tomisato Miura, Yasushi Mariya, Siamak Haghdoost
BACKGROUND: Reactive oxygen species (ROS) mediate much of the DNA damage caused by ionizing radiation. Among carotenoids, lycopene and β-carotene, present in tomato juice, are known to be strong radical scavengers. The aim of the study was to investigate the effect of tomato juice intake on the levels of DNA damage and oxidative stress in human whole blood induced by in vitro exposure to X-rays. METHODS: Ten healthy adults were asked to drink 190 g of tomato juice, containing 17 mg lycopene and 0...
May 12, 2017: Nutrition Journal
https://www.readbyqxmd.com/read/28493802/placental-imaging-normal-appearance-with-review-of-pathologic-findings
#19
Shaimaa Fadl, Mariam Moshiri, Corinne L Fligner, Douglas S Katz, Manjiri Dighe
The placenta plays a crucial role throughout pregnancy, and its importance may be overlooked during routine antenatal imaging evaluation. Detailed systematic assessment of the placenta at ultrasonography (US), the standard imaging examination during pregnancy, is important. Familiarity with the normal and abnormal imaging appearance of the placenta along with the multimodality and methodical approach for evaluation of its related abnormalities is necessary, so that radiologists can alert clinicians regarding appropriate prompt management decisions...
May 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28490467/dose-optimization-to-minimize-radiation-risk-for-children-undergoing-ct-and-nuclear-medicine-imaging-is-misguided-and-detrimental
#20
Jeffry A Siegel, Bill Sacks, Charles W Pennington, James S Welsh
A debate exists within the medical community on whether the linear no-threshold (LNT) model of ionizing radiation exposure accurately predicts subsequent radiogenic cancer incidence. We evaluate the evidence that refutes LNT, and its corollary efforts to reduce radiation exposures for CT and nuclear medicine imaging in accord with ALARA (as low as reasonable achievable), particularly for children. Further, we review studies demonstrating that children are not, in fact, more radiosensitive than adults in the radiological imaging dose range, rendering dose reduction for children unjustifiable and counterproductive...
May 10, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
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