View clinical trials related to Radiation Exposure.
Filter by:This trial investigates operator radiation doses when performing standardized procedures using two different means of radiation protection, namely conventional lead shield and apron versus suspended protection system (Zero-Gravity, ZG). The performed procedure is standard endovascular aortic repair (EVAR). The hypothesis is that ZG offers superior protection for the operator.
There has been increasing awareness regarding the risk of radiation exposure to patients and providers when performing procedures requiring fluoroscopic guidance.
Aims: to determine the radiation exposure of routine intraoperative cholangiography (IOC )during cholecystectomy and examine the factors affecting radiation dose and fluoroscopy time (FT). Methods: 598 intraoperative cholangiography examinations were performed at the Central Finland Central Hospital. In this study we included 324 intraoperative cholangiographies performed with c-arm equipment not exceeding 10 years of age.
The main purpose of this study is to assess and test the reproducibility and results of hyperpolarized 3-Helium gas as a contrast agent with Magnetic Resonance Imaging (MRI) of the lungs in healthy adult subjects.
This study is conducted by a working group of the French Society of Medical Physics (SFPM). Its main aim is to establish reference dose levels for the most common procedures performed in operating rooms using mobile X-ray systems, hence helping medical physicists and surgeons to evaluate their practice and optimize patient radiation protection. This is a multi-centric prospective study involving 73 medical institutions of different categories (public university hospitals, clinics, centers dedicated to cancer treatment, etc.). It consists on progressively collecting anonymous data for 15 to 30 procedures from a list of 62 types of procedures, belonging to 7 surgery specialties (neurosurgery, orthopedic surgery, digestive surgery, urology, cardiology, vascular surgery and multi-specialty). Collected data include patient BMI and information about the X-ray equipment, the medical procedure and the dosimetric parameters. Data collection doesn't require the access to the patient medical record and doesn't impact his medical care. Proposed dose reference levels will be expressed in terms of KAP (Kerma-Area-Product), fluoroscopy time and air Kerma. Moreover, multiple statistical analyses will be done to investigate the impact of different variables on the procedure X-ray doses.
The primary objective of this study is to determine if a novel lead-based arm board is effective at reducing radiation dose to the operator during invasive cardiac procedures. Secondary objectives are to measure effect on radiation dose to patient and total fluoroscopy (x-ray) time.
Percutaneous transhepatic biliary drainage (PTBD) procedures are associated with an elevated radiation exposure for the patient. In the recently published guideline of the Federal Office for Radiation Protection in Germany diagnostic reference levels (DRLs) for dose area products (DAP) are not defined for PTBD procedures due to insufficient data. The aim of this retrospective study is to give a nation-wide survey on patients radiation exposure in different PTBD procedures considering factors that may have an impact on increased radiation exposure like fluoroscopic-guided versus ultrasound-guided bile duct puncture.
The goal of this study is to determine whether use of promotility agents to stimulate gastric peristalsis can reduce fluoroscopy time and procedure time during gastrojejunostomy (GJ) tubes placement in interventional radiology (IR). The investigators hypothesize that increased gastric peristalsis will aid in advancing a guidewire through the pylorus, a time consuming and tedious step required during GJ tube placement. In order to maximize scientific rigor and clinical practice impact, the investigators aim to answer this question through a blinded, randomized, placebo controlled trial. Specific Aim 1: To test the hypothesis that a single dose of IV metoclopramide immediately prior to GJ tube placement reduces the fluoroscopy time required to advance a guidewire through the pylorus. Specific Aim 2: To determine whether a single dose of IV metoclopramide immediately prior to GJ tube placement reduces total procedure fluoroscopy time, air kerma and total procedure time. Specific Aim 3: To assess the safety of a single dose of promotility agent prior to GJ tube placement by assessing rates of adverse events in the periprocedural period in patients receiving IV metoclopramide versus placebo.
Lung cancer screening programs are still discussed in Europe today, and one of the concern is radiation due to iterative CT. The aim of this monocentric, prospective, non randomized study is to compare an ultra low dose chest CT (approaching a two views X ray) versus a standard low dose chest CT for ≥4mm lung nodules detection, and secondary for lung nodule characterization and smoking associated findings (emphysema, bronchial abnormalities and coronary calcifications).
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.