View clinical trials related to Radiation Exposure.
Filter by:The adjustment of radiation dose in many CT protocol are based on body mass index(BMI) or weight of the patient. In the literature, neck circumference (NC) has been reported as a new anthropometric parameter indicating the body mass for the upper body. NC may be an important landmark in the determination of the low dose protocols for upper body CT examinations such as neck, chest and coronary CT.
Background: - The National Cancer Institute was funded to study how much radiation U.S. veterans who served in the 1950s were exposed to. Researchers want to estimate how much radiation these veterans received. They will use two methods and compare them. One is to interview the veterans and study their military records. The other is to take blood samples and look for certain types of changes in the blood cells. Being exposed to some kinds of radiation is known to cause changes in blood cells. The amount of changes to these cells tells scientists about how much radiation was received. Objectives: - To better understand how to measure how much radiation a person has received. Eligibility: - Veterans who were exposed to radiation at a specific site in the Pacific in 1954 or other sites in the 1950s. - Veterans close in age to the first group, who have low levels of exposure to radiation. - Men about 25 years old with no exposure to radiation. Design: - Participants will have 1 visit, in their home. - All participants will have blood drawn. This will take 10 minutes. - The exposed veterans will be interviewed. They will answer questions about the nuclear events they experienced. This will take up to 40 minutes. - For the exposed veterans, researchers will look at their military records, if they can. They will estimate how much radiation the veteran received.
ERCP is associated with radiation exposure to the endoscopist and staff, which may be significant at high volume programs despite the use of lead aprons. We hypothesize that draping of the fluoroscopy image intensifier may significantly reduce staff radiation exposure and help achieve implementation of the ALARA (As Low As Reasonably Achievable) principle.
Radiation issue during percutaneous coronary interventions is an important issue for operators due to the long term stochastic risk of cancer induction, but is often under-evaluated. Many factors may be associated with the radiation dose adsorbed by operators. In particular the most important are the position taken by the operator, the use of dedicated X-ray shield and the duration of the procedure. However other factors (as operator height or the angulation of the radiation tube) might have some important effects but are often under-evaluated . Aim of our observational study is to evaluate the most important determinants of the radiation dose adsorbed by operators during different coronary procedures (diagnostic coronary angiography or percutaneous coronary interventions) and through different vascular accesses (right or left transradial approach or transfemoral approach). All patients who underwent to percutaneous coronary diagnostic or interventional procedures will be enrolled in this observational study. Each operator will be equipped with dedicated dosimeters placed at left wrist, at thorax level outside the lead apron and at head level to evaluate the radiation dose at crystalline. Effective doses delivered to patients will be expressed as dose area product (DAP) and measured in Gycm2.
This study is to be performed at two clinical sites where patients received CardioGen-82 during the time period January to June, 2011 and where patients were scanned chronologically near to the index patients (2 days before or after). Of these, it is planned that at least 30 patients will be entered in this trial. Index patient is the term applied to individuals who had radiation spectra indicative of Sr-82 and Sr-85 detected by hand-held survey meters.
This study will be performed at clinical sites that have administered CardioGen-82® to patients from January to July 2011. The patients enrolled(i.e., "target date patients") will be all those who were dosed at the end of use of the CardioGen-82® generators on the last day of generator use from the generator that was used immediately prior to the recalled generator (i.e., "target date generators"). These are not patients who received drug eluted from the recalled generator. Of these patients, it is planned that 100 patients will be entered in this trial.
This is a collaborative study by the National Cancer Institute, Columbia University, and the Southern Urals Biophysics Institute in Russia. It will examine the relationship of differences in certain genes to the development of chromosomal abnormalities in workers at the Mayak nuclear production plant in Ozyorsk, Russia. This population was exposed to higher radiation doses from external and internal sources than those received by their counterparts in other countries or considered permissible today. If a risk relationship is found between genetic differences and chromosome abnormalities, the information might be useful in studies designed to examine how high radiation exposures cause cancer. Radiation-exposed Mayak workers employed from 1948 to 1972 in the three Ozyorsk plants directly related to nuclear weapons production may be eligible for this study. They must have remained local residents in the area and estimates of their external and internal radiation exposures must be available. Participants provide a blood sample for genetic studies and answer a questionnaire that includes demographic information and information about their family health history, history of benign tumors, if any, and history of smoking and alcohol consumption. Additional information is collected from patients' medical records. ...
The purpose of this study is to measure the amount of radiation over a specific period of time that Orthopaedic Surgeons are exposed to while using the mini c-arm fluoroscopy machine.