نتایج جستجو برای: external radiation

تعداد نتایج: 420496  

2006
SIYONG KIM TAE-SUK SUH

Radiation therapy, often called radiotherapy, can be defined as the use of high-energy radiation such as x-rays, gamma rays, electrons, protons and neutrons to kill cancer cells and reduce the size of tumors. Shortly after the discovery of the x-ray by Wilhelm Conrad Roentgen and radioactivity by Marie and Pierre Curie about 100 years ago, the mysterious and powerful radiations were being used ...

Journal: :AJNR. American journal of neuroradiology 2004
Hiro Kiyosue Mika Okahara Shuichi Tanoue Yoshiko Sagara Shunro Matsumoto Hiromu Mori Miori Arita Tetsuo Watanabe Masashi Suzuki

We report a rare complication following parent-artery occlusion in a patient with radiation-induced carotid pseudoaneurysms. Both the right internal carotid artery pseudoaneurysm and the recurrent external carotid artery pseudoaneurysm were treated by parent-artery occlusion with coils. Although rebleeding was not observed after the second embolization, angiography and endoscopy at the 12-month...

2017
Manish Kumar Gupta R. K. Khanna

Conduction of an external sensed signal in the human nervous system can be defined in the form of electrical RC circuit equivalent which is realized very well by the researchers. In this paper, experimental results due to the continuous exposure to external cell phone radiation on the nervous are being reported. Experimental data are stored using DSO and analyzed by ORIGIN Software. Comparison ...

2015
György Kovács

Intensity modulated brachytherapy (IMBT) is a modern development of classical interventional radiation therapy (brachytherapy), which allows the application of a high radiation dose sparing severe adverse events, thereby further improving the treatment outcome. Classical indications in head and neck (H&N) cancers are the face, the oral cavity, the naso- and oropharynx, the paranasal sinuses inc...

Hamed Babapour Maryam Shahidi Tayyeb Allahverdi Pourfallah,

Introduction The exposure of human beings to ionizing radiation from natural sources is a continuing and inescapable feature of life on earth. For most individuals, this exposure exceeds that from all man-made sources combined. Materials and Methods In this study, the annual effective dose in high level environmental background radiation areas (HLEBRAs) of northern city of Ramsar in Iran was de...

Journal: :Arhiv za higijenu rada i toksikologiju 2009
Ivica Prlić Marija Surić Mihić Gordana Marović Tomislav Mestrović

Radiation dosimetry in protection against ionising radiation involves research of all possible pathways through which natural or man-made radioactive materials can contaminate a habitat and actually harm its biota. It also takes into account natural and artificial (man-made) electromagnetic ionizing radiation (gamma and x radiation). This article presents a dosimetric study assessing exposure t...

2016
Geeta Kulkarni Xiuli Liu Bo Shen

Radiation therapy is a viable option in managing potentially life-threatening malignancies including prostate cancer. It is known that pelvic radiation can result in injury of the distal large bowel with the development of radiation proctitis. Despite reports from retrospective studies, there is a lack of direct endoscopic and histologic evidence of external pelvic radiation injury to the ileal...

Journal: :Journal of nuclear medicine : official publication, Society of Nuclear Medicine 2007
Seza A Gulec Jeffry A Siegel

Radiomicrosphere treatment involves the intrahepatic arterial administration of (90)Y-resin or (90)Y-glass microspheres. The microspheres are biocompatible, but not biodegradable, and little to no (90)Y leaches from the microspheres. Without any bioelimination, the beta-dose delivery is generally confined to the liver. Although U.S. Nuclear Regulatory Commission requirements permit patients tre...

Journal: :Archives of ophthalmology 2003
Dennis M Robertson Helmut Buettner Colum A Gorman James A Garrity Vahab Fatourechi Rebecca S Bahn Ivy A Petersen Scott L Stafford John D Earle Glenn S Forbes Robert W Kline Erik J Bergstralh Kenneth P Offord Diana M Rademacher Nancy M Stanley George B Bartley

BACKGROUND A prospective study was conducted to determine if external ionizing radiation could favorably influence the orbital manifestations of Graves ophthalmopathy. Diabetes and untreated systemic hypertension were exclusion criteria. Radiation was directed to the orbits of 42 affected patients using 0.2 rad (20 Gy) delivered in 10 doses of 0.02 rad (2 Gy). Patients were periodically examine...

2005
J. K. Jørgensen

We discuss the effects of an enhanced interstellar radiation field (ISRF) on the observables of protostellar cores in the Orion cloud region. Dust radiative transfer is used to constrain the envelope physical structure by reproducing SCUBA 850 μm emission. Previously reported 13CO, C17O and H2CO line observations are reproduced through detailed Monte Carlo line radiative transfer models. It is ...

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