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Essay / Research Paper Abstract
This 8-page paper explains what ultrasound is and how the procedure is performed. It defines a series of terms relating to the procedure, such as ring-down and refraction, and includes several images. Bibliography lists 8 sources.
Page Count:
8 pages (~225 words per page)
File: D0_HVUltra.rtf
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Unformatted sample text from the term paper:
performed during pregnancy, but it can also help doctors examine the heart, liver, kidneys and other organs (Radiological Society of North America, Inc.). The ultrasound image is usually a
cross-section of the structure under examination; however, it doesnt provide good images through bone or of bone structure, nor does it reveal good images of "bodies of gas such as
found in the lung and bowel" (Anderson). However, the test is useful because it is non-invasive as noted above, doesnt use radiation and captures images in real time,
which means they show the "movement of internal tissues and organs, and enable physicians to see blood flow and heart valve functions" (Radiological Society of North America, Inc.). Ultrasound
examinations can help doctors assess post-heart attack damage or diagnose a number of heart conditions (Radiological Society of North America, Inc.). In this paper, well look at the way
the ultrasound process works, then list and define some of the terms connected with the examination. Finally, Ill try to include some actual ultrasound photos in the paper. How
it Works In order to produce medical ultrasound images, an electrical current is passed through "a piezoelectric (pressure-electric) crystalline material" (Mintz 1478). This material, which is usually a
ceramic, expands and contracts, and when electrically excited, produces sound waves. The sound waves are directed at the desired area; after they are reflected back from the tissue, part
of the "ultrasound energy returns to the transducer" (Mintz 1478). The transducer produces an electrical impulse, which is then "converted into the image" (Mintz 1478). During the
process, the beam remains "fairly parallel" for some distance, a phenomenon known as near field; when it gets further from the source it begins to diverge, a process called far
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