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Renco manufactures ultrasonic instrumentation for the detection
of pregnancy in mammals and for the measurement of tissue thickness
in various animals.
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Contact us today!
Renco Corporation
116 Third Ave. North
Minneapolis, MN 55401
Toll Free: 800-359-8181
Local: 612-338-6124
Fax: 612-333-9026
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Important
New FAQ
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When
measuring backfat in live swine, why don’t the Renco
Lean-Meater® and Renco Sono-Grader® indicate the
same thickness as a real-time ultrasonic scanner (RTUS)? |
A. |
The
Lean-Meater and Sono-Grader are calibrated to measure
fat thickness, while RTUS’s are calibrated to measure
loin muscle thickness. This can result in a difference
of 10-12%
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Technical
explanation:
Thickness is determined by the time required for sound
to travel through the tissue , multiplied by the speed
of sound in that tissue. Thus the assumed speed of sound
through the tissue is critical. Ultrasound travels through
fat tissue at approximately 1480 meters/second and travels
through muscle at 1630 meters/second. Real-time scanners
are intended to show images of a complete loin muscle
structure, so they must determine distance using the higher
speed of sound. This causes RTUS’s to indicate an
erroneously high reading for backfat thickness.
Additional
Information:
Ultrasound travels slower through softer less dense
tissue such as backfat, than harder denser tissue such
as muscle. Researchers have determined that there can
be a range of speeds depending temperature and the physiological
condition of the specimen fat .
The Renco
Lean-Meater is calibrated for a speed of 1480m/sec.
The Renco Sono-Grader provides for two separate user-adjustable
calibrations, one for the lower speed of sound through
fat, and the other for the higher speed of sound through
muscle. Each calibration can varied ?50% from the factory
settings of 1480m/s and 1630m/s.
While
this discussion relates to backfat in live swine, it
is also applicable to fat structures in other mammals.
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