Edge Ultrasound System Betriebsanweisung Seite 179

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Seitenansicht 178
167
Glossary
Glossary
Terms
For ultrasound terms not included in this glossary, refer to
Recommended Ultrasound Terminology,
Second Edition,
published in 1997 by the American Institute of Ultrasound in Medicine (AIUM).
as low as reasonably
achievable
(ALARA)
The guiding principle of ultrasound use, which states that you should
keep patient exposure to ultrasound energy as low as reasonably
achievable for diagnostic results.
curved array
transducer
Identified by the letter C (curved or curvilinear) and a number (60).
The number corresponds to the radius of curvature of the array
expressed in millimeters. The transducer elements are electrically
configured to control the characteristics and direction of the acoustic
beam. For example, C60x.
depth Refers to the depth of the display. A constant speed of sound of
1538.5 meters/second is assumed in the calculation of echo position
in the image.
in situ
In the natural or original position.
LCD liquid crystal display
linear array
transducer
Identified by the letter L (linear) and a number (38). The number
corresponds to the radius of width of the array expressed in
millimeters. The transducer elements are electrically configured to
control the characteristics and direction of the acoustic beam. For
example, L38xi.
mechanical index
(MI)
An indication of the likelihood of mechanical bioeffects occurring: the
higher the MI, the greater the likelihood of mechanical bioeffects. See
Chapter 7, “Safety,” for a more complete description of MI.
MI/TI See
mechanical index (MI)
and
thermal index (TI)
.
NTSC National Television Standards Committee. A video format setting. See
also
PAL
.
PAL Phase Alternating Line. A video format setting. See also
NTSC
.
phased array A transducer designed primarily for cardiac scanning. Forms a sector
image by electronically steering the beam direction and focus.
skinline A depth on the display that corresponds to the skin/transducer
interface.
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