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  • Radiology
  • With the growing use of CT exams being performed and radiation dose in CT being a hot topic in the radiology community, it is imperative to monitor radiation dose from the CT exams as well as observe trends over time. (uw.edu)
  • Following post-doctoral studies, Jirtle was appointed Assistant Professor of Radiology at Duke University in 1980, and became Professor of Radiation Oncology in 1990 and Associate Professor of Pathology in 1998. (wikipedia.org)
  • optimization
  • Key points of the authors include, "To reduce patient and operator radiation dose involves optimization of medical imaging equipment and best control of the equipment by the operator. (uw.edu)
  • high-dose
  • 150 mSv, a range known as high-dose radiation, have measurable and often serious immediate effects on humans ( 4 ). (pnas.org)
  • Regulations now require that CT dose has to be documented and available on demand, CT protocols be revisited on an annual basis and incidents with high dose CT exams be reviewed. (uw.edu)
  • clinical
  • Successful efforts to reduce overall radiation doses may actually direct attention away from other critical pieces of information that have so far been underappreciated, namely the widespread variability in global radiation dose values across clinical operation volumes. (uw.edu)
  • Healthcare
  • At our institution, we have been managing dose using a commercial product, Dose Watch (General Electric Healthcare) and also have a radiation safety committee within the department to review dose trends and make intelligent decisions based on our dose data. (uw.edu)
  • scanner
  • City of Hope's new CT scanner offers high-resolution images at lower levels of radiation exposure compared to older machines. (cityofhope.org)
  • Now City of Hope has become one of the few hospitals in the nation, and the first in Southern California, to use a high-definition - but low-dose - CT scanner. (cityofhope.org)
  • Although higher-definition scans usually mean more X-rays, and thus more radiation, the new scanner changes that ratio. (cityofhope.org)
  • The new high-definition CT scanner can offer 128-slice images while still reducing the radiation exposure up to 60 percent compared to an older 16-slice scanner. (cityofhope.org)
  • The new CT scanner is able to increase image detail with lower doses through the use of improved technology and better software. (cityofhope.org)
  • Ionizing
  • Ionizing radiation fills the universe. (pnas.org)
  • mice lacking H2AX are viable but deficient in these two areas as well as being sensitive to ionizing radiation. (pnas.org)
  • In experiments where human skin tissue samples were exposed to low doses of ionizing radiation, scientists at Pacific Northwest National Laboratory found that a skin tissue model showed perturbations that suggest its stability is altered. (medicalxpress.com)
  • Ionizing radiation is classified as a neurotoxicant. (wikipedia.org)
  • Prenatal exposure to ionizing radiation at the 8-15 and 16-25 weeks after ovulation was found to induce severe mental retardation as well as variation in intelligence quotient (IQ) and school performance. (wikipedia.org)
  • There has been a tremendous increase in the use of ionizing radiation in medicine during recent decades. (wikipedia.org)
  • At the low doses of relevance to environmental radiation exposure, individual cells only rarely experience traversals by an ionizing particle and almost never experience more than one traversal. (wikipedia.org)
  • thyroid
  • Measurements for many of them are two to four times greater than those aboard the U.S.S. Ronald Reagan , the staff of which received an estimated whole-body dose of 0.008 rem and a thyroid radiation dose of 0.11 rem. (thenewamerican.com)
  • The crew of the U.S.S. Shiloh received the most radiation during Operation Tomodachi, registering a whole-body dose of 0.033 rem and a thyroid dose of 0.31 rem. (thenewamerican.com)
  • nuclear
  • The newly FDA-approved imaging system offers 50% lower doses than standard nuclear medicine scanners. (zdnet.com)
  • But, the new tech offers patient doses as low as 50% that of the standard nuclear medicine scanners - without affecting image quality, GE says . (zdnet.com)
  • U.S. sailors are suing a Japanese utility for exposing them to nuclear radiation during a 2011 humanitarian mission to aid tsunami victims. (thenewamerican.com)
  • But Myers also quoted Navy spokesman Lt. Greg Raelson, who explained these crew members of the nuclear-powered aircraft carrier U.S.S . Ronald Reagan (shown) did not receive hazardous doses of radiation exposure during their time on the mission. (thenewamerican.com)
  • It was the largest nuclear disaster since the Chernobyl disaster of 1986, and the radiation released exceeded official safety guidelines. (wikipedia.org)
  • perfusion
  • In the scans, colors correspond to the level of blood flow: white and red are areas of high perfusion and darker areas show low perfusion. (zdnet.com)
  • tissue
  • The aims of the project were to develop methods for the sensitive enumeration of mutations in DNA, to measure mutation frequencies in a wide variety of tissue types and to quantify the mutational effect of direct oxidative damage produced by radiation, at both high and low doses. (unt.edu)
  • reduce
  • Compared to the current standard method for image reconstruction, the so-called Filtered Back Projection (FBP), IRIS offers two options to users of the Siemens procedure: They can either generate the same image quality as with FBP and reduce the dose by up to 60 percent or they can maintain the same dose and generate significantly better image quality than with FBP. (hhmglobal.com)
  • V/Q scans can offer lower radiation doses, and may be adapted to further reduce the dose by omitting the lung ventilation portion of the exam. (wikipedia.org)
  • spatial
  • Mathematical procedures calculate the attenuation coefficient in the cross-section plane as well as the spatial distribution of density from the attenuation of the radiation as it passes through the body. (hhmglobal.com)
  • Practices
  • This excellent research from UCSF documents that education about best CT dose practices has a significant impact. (uw.edu)
  • medical
  • Dose management is, however, a team effort and it is not possible to do this effectively without a team of radiologists, technologists, and medical physicists participating in this important task. (uw.edu)
  • affects
  • According to the Japanese Government, 180,592 people in the general population were screened in March 2011 for radiation exposure and no case was found which affects health. (wikipedia.org)
  • risk
  • A vigorous ground-based cellular and animal model research program will help quantify the risk to the CNS from space radiation exposure on future long distance space missions and promote the development of optimized countermeasures. (wikipedia.org)
  • Research on new approaches to risk assessment may be needed to provide the necessary data and knowledge to develop risk projection models of the CNS from space radiation. (wikipedia.org)
  • In 1997 Stewart was invited to become the first Chair of the European Committee on Radiation Risk. (wikipedia.org)
  • Journal of Radiological Protection International Radiation Protection Association European Committee on Radiation Risk Berlin, L. (November 2011). (wikipedia.org)
  • however
  • However, the question remains whether radiation therapy results in a complete ablation of the stem cell pool in the hippocampus or whether some stem cells survive. (wikipedia.org)
  • However, the heavy ion component of space radiation presents distinct biophysical challenges to cells and tissues as compared to the physical challenges that are presented by terrestrial forms of radiation. (wikipedia.org)
  • decrease
  • In animal studies discussed by Monje and Palmer in "Radiation Injury and Neurogenesis", it has been proven that radiation does indeed decrease or arrest neurogenesis altogether in the hippocampus. (wikipedia.org)
  • It works by measuring the decrease in electrostatic charge on a metal conductor in an ionization chamber, due to ionization of the air in the chamber by radiation. (wikipedia.org)
  • Professor
  • Working with Professor Thomas Mancuso of the University of Pittsburgh she examined the sickness records of employees in the Hanford plutonium production plant, Washington state, and found a far higher incidence of radiation-induced ill health than was noted in official studies. (wikipedia.org)
  • is a theoretical physicist and Higgins Professor of Radiation Biophysics, College of Physicians & Surgeons of Columbia University. (wikipedia.org)
  • equivalent
  • You get the benefit of lower kVp effect (kEv in GE units), plus the ability to look at images which are equivalent to 100 or 120 kVp from the same CT raw data. (uw.edu)
  • The equivalent dose of 500 mGy x-rays is 500 mSv. (wikipedia.org)
  • In interplanetary space, GCR organ dose and dose-equivalent of more than 0.2 Gy or 0.6 Sv per year, respectively, are expected. (wikipedia.org)
  • higher
  • Because CT scans are built from multiple X-rays, the scanners expose the patient to higher radiation than a single X-ray. (cityofhope.org)
  • This is understandable, since it takes exponentially higher doses over a much shorter time period to induce radiation sickness - e.g., nausea, vomiting, hair loss, and burn-like skin lesions. (thenewamerican.com)
  • On this scale, natural background radiation is ≈0.01 mSv/day, although there are areas on earth that have values 5-fold higher ( 2 ), and space-station inhabitants may receive ≈1 mSv/day ( 3 ). (pnas.org)
  • In this issue of PNAS, Rothkamm and Löbrich ( 9 ) report that the number of DSBs formed, as measured by the number of γ-H2AX foci formed, is linear with dose from 1 mGy to 2 Gy and is also in line with pulse-field gel electrophoresis measurements at higher doses. (pnas.org)