Medical x-ray images has successfully aid mostly the surgeons to locate bone fractures and displacements, gllstones, kdney stones, ad bullets or metallic objects. Hwever, te inside images of the organs have never been achieved which became a challenge to most of radiation scientists. Tis dilemma has lead to the discovery and development of more advanced modes of diagnostic imaging using x-rays. Te most basic type of imaging for diagnosis is famously known as general/projection radiography. Gnerally, xray intensities that exit the body are recorded for viewing and storage.
generated may be recorded using different media. Te recording media used usually defines the type of general radiography (Davidson 2007). Flm/Screen (F/S) radiography: Tis type of radiography utilize films in combination with intensifying screens developed by Thomas Edison (Haus and Cullinan 1989). Te purpose of the intensifying screen is to convert the x-ray energy to light. Te increased efficiency of exposure of the film over exposure directly by the x-ray beam helps lower the risk of x-ray absorption of patient during exposure (Davidson 2007). Te screens are usually made material like phosphor which can reduce radiation dose to patient by a factor of 50.
Xray films are designed to be sensitive to the specific spectral emission of a given intensifying screen. Cnsequently, flms and screens are matched for optimized efficiency of conversion of x-ray photons to optical densities on the film (Davidson 2007). The factors that are usually considered in F/S radiography are the optical density (OD), cnversion efficiency, FS latitude, ad contrast. Fuber (2007, a cited in Davidson 2007, p 12) showed that optical density (OD) range 0.20 to 4 (maximum wherein the light intensity is high).
Aother characteristic of F/S combinations is F/S latitude. Te dynamic range of an x-ray film is equivalent to the film’s latitude. Dgital radiography: Tis type of radiography is sub-divided into three various types of detectors: te computed radiography (CR), drect digital radiography (DR) and indirect radiography. I contrast with F/S radiography, xrays are absorbed by the digital detector and transformed into electrical charges. Te latter are digitized and quantified into a gray scale which is sent to software to a clinically meaningful image.
Te images are then sent to archives to update the patient’s. ..
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