RESUMO
Digital subtraction angiography (DSA) has been widely accepted and applied. The concentration of iodine in the vessels of interest is low in intravenous DSA. The resultant images can be improved to some extent by increasing the radiation dose. Therefore DSA could become, and possibly could remain, a relatively high-dose procedure. The contributions to dose from the various components of the examination such as fluoroscopy, positioning, test exposures, and final acquisition runs are considered separately. Individual segments of a DSA examination are discussed to show how and where opportunities arise to reduce doses to the lowest levels consistent with satisfactory images.
Assuntos
Angiografia/métodos , Angiografia/educação , Angiografia/instrumentação , Computadores , Fluoroscopia , Humanos , Postura , Doses de Radiação , Técnica de Subtração/instrumentaçãoRESUMO
Intravenous arteriography is a useful method which should be considered for those patients in whom arterial catheterization is a risk. The technique permits visualization of the entire aorta and its major branches. While inferior to conventional arteriography, the diagnostic information provided by intravenous arteriography is adequate for most patients with aortic aneurysm or major stenotic lesions. Detail can be improved by using subtraction techniques. Images comparable to those produced by digital angiography can be obtained at relatively low cost.
Assuntos
Angiografia/métodos , Meios de Contraste/administração & dosagem , Humanos , Injeções IntravenosasRESUMO
The image quality of photofluorographic spot films (70, 100 or 105mm) has bee gradually improving as high resolution image intensification has evolved. With newly available 1023-line fluoroscopic monitors providing 2.8 line pairs/mm resolution, it is now possible to photograph diagnostic images directly off the monitor. Such images provide detail similar to that currently available on 100mm spot films. A multi-image camera has been modified to record spot films from the video disc image resulting in marked reduction in patient radiation and film cost. Initial findings incorporating pulsed fluoroscopy using a video disc are discussed.
Assuntos
Fluoroscopia/instrumentação , Fotofluorografia/instrumentação , Custos e Análise de Custo , Humanos , Fotofluorografia/métodos , Fotofluorografia/normas , Doses de Radiação , Intensificação de Imagem Radiográfica , Radiometria , Tecnologia RadiológicaRESUMO
A feasibility study for the photographic recording of fluoroscopic images from a high resolution system is described. Resolution on the television monitor was 2 line pairs/mm, making clinically acceptable recordings possible. Significant reductions in radiation dose to the patient and potential financial savings are indicated if a multiformat camera is developed to photograph the monitor.