Summarize the text below in no more than 2000 words and create a featured list of the most important learnings, explaining each one of them:


Diagnostic radiology is a dynamic specialty that continues to undergo rapid
change with ongoing advancements in utilization and technology. Not only
has the number of imaging methods increased, but each one continues to
undergo improvement and refinement of its use in medical diagnosis. This
chapter reviews the basics of the major diagnostic imaging methods and
provides the basic principles of image interpretation for each method.
Contrast agents commonly used in diagnostic radiology are discussed. The
basics of nuclear radiology are discussed in later chapters.
CONVENTIONAL RADIOGRAPHY
Conventional radiographic examination of the human body dates back to the
genesis of diagnostic radiology in 1895 when NAME_1 Roentgen produced thefirst x-ray film image of his wife’s hand. Conventional radiography remains
fundamental to the practice of diagnostic imaging.
Image Generation. X-rays are a form of radiant energy similar in many
ways to visible light. X-rays differ from visible light in that they have a very
short wavelength and are able to penetrate many substances that are
opaque to light. The x-ray beam is produced by bombarding a tungsten target
with an electron beam within an x-ray tube.
Film Radiography. Conventional film radiography utilizes a screen-film
system within a film cassette as the x-ray detector. As x-rays pass through
the human body they are attenuated by interaction with body tissues
(absorption and scatter) and produce an image pattern on film that is
recognizable as human anatomy. X-rays transmitted through the patient
bombard a fluorescent particle–coated screen within the film cassette causing
a photochemical interaction that emits light rays, which expose photographic
film within the cassette (NAME_2. 1.1). The film is removed from the cassette and
developed by an automated chemical film processor. The final product is an
x-ray image of the patient’s anatomy on a film (NAME_2. 1.2).
Computed radiography (CR) is a filmless system that eliminates chemical
processing and provides digital radiographic images. CR substitutes a
phosphor imaging plate for the film-screen cassette. CR cassette sizes match
those available for traditional film-screen cassettes. The same gantry, x-ray
tube, and exposure control systems, and cassette holders used in
conventional radiography are utilized for CR. The phosphor-coated imaging
plate interacts with x-rays transmitted through th