Download Radiography in the Digital Age: Physics, Exposure, Radiation by Quinn B. Carroll PDF

By Quinn B. Carroll

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Additional info for Radiography in the Digital Age: Physics, Exposure, Radiation Biology

Example text

The main advantage of all digital imaging is something called postprocessing. Postprocessing means that the contrast, brightness and several other aspects of the image can be manipulated and changed without repeating the original x-ray exposure. Not only has this saved millions of dollars by reducing repeated procedures in medical imaging departments, but it has dramatically reduced overall radiation exposure to the public as patients. This is the very goal of medical radiography, to maximize diagnostic information while minimizing radiation exposure to the public.

This is potentially harmful because it can lead to Photon chemical changes. In turn, chemical changes can cause biological changes, including diseases such as cancer. The important point to make here is that Photoelectron more than three-fourths of all the radiation we receive comes from nature rather than from technology. It is something we have always lived with, even before the discovery of x-rays. We are irradiated by minerals in the ground, by minerals within our own bodies, by the sun and even by stars and novas in space (Fig.

Now, to simplify the math, imagine the whole pipe system is square rather than round. If you press on the cylinder at the small end of the pipe with just 10 pounds of force, the pressure is 10 pounds per square inch. By Pascal’s law, the pressure at the other end must also be 10 pounds 25 26 Radiography in the Digital Age Figure 2-6 4000 lb 10 lb = 400 in2 = 1 in2 Liquid pressure throughout = 10 lb/in2 In this liquid-filled system, a force of 10 pounds applied at the small cylinder can be leveraged up to 4000 pounds at the large cylinder, because the pressure is conserved throughout the system at 10 pounds per square inch.

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