Category: S

In radiographic film analysis, the curve derived by graphing the exposure to the film versus the film density. Analysis yields information about the contrast, speed, latitude, and maximum and minimum densities of the film or film-screen system. Digital radiography systems exhibit linear curves.  

The posterior curvature of the sacral vertebrae. The sacral curvature is a primary spinal curve that develops during the embryonic period.  

The spreading of the bacteria inoculum by drawing a wire containing the inoculum across the surface of the medium.  

A culture in which the medium is placed in a tube that is slanted to allow greater surface for growth of the inoculum of bacteria.  

A crystal composed of spermine phosphate and seen in prostatic fluid on addition of a drop of ammonium phosphate solution.  

A form of croup that typically occurs in the middle of the night. The characteristic barky cough is present, but there are no other signs of viral illness. The child is perfectly fine the next morning, only to have a repeat of symptoms the next 2 or 3 nights. Hospitalization is rarely required. An allergic…

Acute vomiting, dehydration, hypotension, and sudden death as a result of acute loss of sodium; may be caused by adrenal hyperplasia, salt-losing nephritis, or gastrointestinal disease.  

A cerebral convolution on the lateral surface of the parietal lobe above the posterior part of the sylvian fissure.  

The physical characteristics of an object or imaging technique that influence how the object’s image will appear on a radiographical film. The subject contrast of a radiograph can be increased or decreased by increasing or decreasing the kilovoltage peak (kVp). It may also be affected by the thickness, density, and composition of the subject.  

A radiograph that demonstrates large differences in density between adjacent areas. Short-scale contrast is a result of low kilovoltage peak (kVp). In dental radiography, for example, a kVp less than about 60 must be used to produce a radiograph with short-scale contrast. A radiograph characterized by predominantly bright areas attributed to the utilization of lower…