Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “PROJECTIVE TECHNICS”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 1,297 records · Page 72Linked to original sources

Origins of the Human Genome Project.

The Human Genome Project has become a reality. Building on a debate that dates back to 1985, several genome projects are now in full stride around the world, and more are likely to form in the next several years. Italy began its genome program in 1987, and the United Kingdom and U.S.S.R. in 1988. The European communities mounted several genome projects on yeast, bacteria, Drosophila, and Arabidospis thaliana (a rapidly growing plant with a small genome) in 1988, and in 1990 commenced a new 2-year program on the human genome. In the United States, we have completed the first year of operation of the National Center for Human Genome Research at the National Institutes of Health (NIH), now the largest single funding source for genome research in the world. There have been dedicated budgets focused on genome-scale research at NIH, the U.S. Department of Energy, and the Howard Hughes Medical Institute for several years, and results are beginning to accumulate. There were three annual meetings on genome mapping and sequencing at Cold Spring Harbor, New York, in the spring of 1988, 1989, and 1990; the talks have shifted from a discussion about how to approach problems to presenting results from experiments already performed. We have finally begun to work rather than merely talk. The purpose of genome projects is to assemble data on the structure of DNA in human chromosomes and those of other organisms. A second goal is to develop new technologies to perform mapping and sequencing. There have been impressive technical advances in the past 5 years since the debate about the human genome project began. We are on the verge of beginning pilot projects to test several approaches to sequencing long stretches of DNA, using both automation and manual methods. Ordered sets of yeast artificial chromosome and cosmid clones have been assembled to span more than 2 million base pairs of several human chromosomes, and a region of 10 million base pairs has been assembled for Caenorhabditis elegans by a collaboration between Washington University and the Medical Research Council laboratory in Cambridge, U.K. This project is now turning to sequencing C. elegans DNA as a logical extension of this work. These are but the first fruits of the genome project. There is much more to come.

Europe↗

The use of 99Tcm-Technegas in the investigation of patients with pulmonary thromboembolism.

Pulmonary embolism remains a major cause of morbidity and mortality, being responsible for an estimated 200,000 deaths per annum in the USA and 21,000 per annum in the UK. Lung scintigraphy is in many instances the investigation of choice in suspected pulmonary thromboembolism. A normal perfusion lung scan excludes pulmonary embolism. An abnormal perfusion scan, while being sensitive, is of low specificity for the diagnosis of pulmonary embolism and needs to be complemented with a ventilation study. Lung ventilation has been studied using inert gases of radiolabelled aerosols. The new radiopharmaceutical 99Tcm-Technegas is a suspension of 99Tcm-labelled, ultrafine, carbon particles produced in an atmosphere of high-purity argon. The size of the particles is of the order of 0.005-0.2 microns, which assures good peripheral penetration and alveolar deposition. After inhalation, static images in multiple projections may be acquired. The resultant images are of excellent technical quality and several publications have shown the value of Technegas images as an adjunct to perfusion imaging in suspected pulmonary thromboembolism. Studies comparing Technegas images with other ventilatory radiopharmaceuticals have in the majority of instances reported comparable diagnostic qualities.

Administration, Inhalation↗

Coding and consent: moral challenges of the database project in Iceland.

A major moral problem in relation to the deCODE genetics database project in Iceland is that the heavy emphasis placed on technical security of healthcare information has precluded discussion about the issue of consent for participation in the database. On the other hand, critics who have emphasised the issue of consent have most often demanded that informed consent for participation in research be obtained. While I think that individual consent is of major significance, I argue that this demand for informed consent is neither suitable nor desirable in this case. I distinguish between three aspects of the database and show that different types of consent are appropriate for each. In particular, I describe the idea of a written authorisation based on general information about the database as an alternative to informed consent and presumed consent in database research.

Databases, Factual↗

Choosing a commode for the ward environment.

The choice of appropriate equipment to promote patient independence and enhance nursing care is of major concern to the nurse in the ward environment. This article reports on a recent evaluation of specialist commodes, (Ballinger et al, 1994), with reference to the programme funded by the Medical Devices Agency, Department of Health, under whose auspices the project was carried out. The results of user evaluations and technical tests of six mobile commodes are presented, the preferred model being the Mayfair commode supplied by Carters (J&A) Ltd. The article concludes by identifying a number of important considerations to bear in mind when selecting a commode.

Activities of Daily Living↗

Significance of a visible major fissure on the frontal chest radiograph.

In this series of 80 patients, five factors are found to contribute to a visible major fissure. Volume changes in either the lower or upper lobes may cause fissural rotation from a coronal to a sagittal plane (26 patients). An incomplete or variant fissure with fluid abutting it (20 patients), or combinations of these factors (16 patients) will make the fissure visible. With either an incomplete fissure or a normal fissure in variant position, pleural thickening (seven patients) or adjacent consolidation (five patients) may make it possible to see the fissure. In normal patients, due to variation in fissural course, the fissure may be visible (six patients). In all of these situations, technical factors such as the divergent beam, position (lordotic), or projection (anteroposterior), may have contributory roles.

Humans↗

Medicaid program; Medicaid eligibility quality control (MEQC) program requirements--HCFA. Final rule with comment period.

This rule revises the regulations governing the Medicaid eligibility quality control (MEQC) program to include more specific program requirements and to establish new timeframes for completing and reporting MEQC case findings to HCFA. The rule also establishes a performance-based threshold for States to meet before HCFA will consider good faith waiver requests of disallowance of Federal financial participation (FEP) in erroneous Medicaid payments and provides more definitive criteria for evaluating States' good faith efforts to meet the national standard error rate. In addition, the rule makes several technical changes and provides that a State may rebut its projected error rate only when it can present evidence that its projected error rate was based on erroneous data. These revisions will strengthen the basic MEQC program and provide flexibility and incentives to States to produce accurate Medicaid eligibility determinations.

Centers for Medicare and Medicaid Services, U.S.↗

Technical aspects of myocardial SPECT imaging.

Myocardial perfusion SPECT imaging accounts for well over 90% of all myocardial perfusion imaging performed in the United States today. Although clearly superior to the traditional planar technique in terms of image contrast and consequent diagnostic and prognostic yield, the SPECT approach also involves additional acquisition and processing steps. This article concisely describes the entire technical sequence of myocardial SPECT imaging, from the acquisition of projection images to their filtration and tomographic reconstruction and concluding with reorientation of the tomographic transaxial images. A simplified explanation of the frequency, or Fourier, domain and the operation of digital filters is also presented to help the reader intuitively understand these important concepts.

Artifacts↗