نتایج جستجو برای: diagnostic equipment quality control reproducibility
تعداد نتایج: 2304140 فیلتر نتایج به سال:
An increasing number of studies have focused on circulating microRNAs (cmiRNA) in cancer patients’ blood for their potential as minimally-invasive biomarkers. Studies have reported the utility of assessing specific miRNAs in blood as diagnostic/prognostic biomarkers; however, the methodologies are not validated or standardized across laboratories. Unfortunately, there is often minimum limited o...
An increasing number of studies have focused on circulating microRNAs (cmiRNA) in cancer patients' blood for their potential as minimally-invasive biomarkers. Studies have reported the utility of assessing specific miRNAs in blood as diagnostic/prognostic biomarkers; however, the methodologies are not validated or standardized across laboratories. Unfortunately, there is often minimum limited o...
OBJECTIVES With rapidly increasing numbers of publications, assessments of study quality, reporting quality, and classification of studies according to their level of evidence or developmental stage have become key issues in weighing the relevance of new information reported. Diagnostic marker studies are often criticized for yielding highly discrepant and even controversial results. Much of th...
Components of an Ultrasound Quality Assurance Program 257 Quality Assurance and Preventive Maintenance 257 Tissue-Mimicking Phantoms 257 Tissue Properties Represented in Phantoms 257 Typical Quality Assurance Phantom Design 257 Cautions About Phantom Desiccation 258 Basic Quality Control Tests 259 Visual Inspection 259 Transducer Choice 259 System Sensitivity 260 Photography and Gray-Scale Hard...
The main purpose of QC program in diagnostic imaging modalities such as medical ultrasound equipment is to evaluate and define the performance safety equipment. Ultrasound systems contain many sensitive transducers soft parts which may be destroyed due poor handling or use. Over time, any machines, regardless their quality usage, depreciates incurs damage ways. results from Quality Control (QC)...
RATIONALE AND OBJECTIVES The American College of Radiology Imaging Network is participating in the National Lung Screening Trial, a large, multicenter, randomized controlled trial, comparing multidetector helical computed tomography (MDCT) versus chest radiography (CXR) in screening for lung cancer. Because the threshold for detection of disease is an inherent function of image quality, and con...
The results of measurements the current dependences thermal resistance junction-case LEDs various types and manufacturers are presented. It is determined that increases with increasing current, for many samples there a noticeable break in dependence at currents close to nominal one. has been experimentally shown steepness can be used as diagnostic parameter makes it possible estimate degree tem...
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