22 OMNISOUND
®
3000C PRO USER MANUAL
COPYRIGHT © 2001 - 2017, ACCELERATED CARE PLUS CORP., ALL RIGHTS RESERVED
Ultrasound has an excellent ability to penetrate deeply, primarily due to its small beam divergence (Schwan, 1958).
A typical beam scan of an applicator is presented below.
Beam Non-Uniformity Ratio
Beam non-uniformity ratio is defined as the ratio of temporal - average spatial - maximum intensity to the temporal
average effective intensity as measured at 5mm from the transducer surface. The typical range for most
commercially obtainable transducers is between 3 to 1 and 10 to 1. BNR can be useful in comparing one unit to
another for field uniformity. One should keep in mind that the spatial maximum intensity in watts/cm
2
is equal to
the calibrated intensity on the output display multiplied by the BNR, i.e.: if 1 watt/cm
2
was registering on the output
display and the BNR was 7:1 the maximum intensity in the tissue would equal 7 watts/cm
2
at certain portions of the
field. This should be kept in mind when determining output dosage. It is also important to maintain continuous
movement of the head for these reasons.
Output Power and Exposure Time
The total power for a given amount of treatment time determines the total energy transferred to the tissue. One
should note that if one uses different ultrasonic generators with differing effective radiating areas, one should use the
total power measurement not the intensity measurement in order to correlate the settings on the units. Times must
also be accurate in order to assure proper treatment dosage. The Omnisound
®
3000C Pro
systems use a quartz
controlled microprocessor based digital timer, which operates in minutes and seconds to an extremely high degree of
accuracy. Care should be taken when applying therapy to move the head continuously over the desired treatment
area.
Model Number: 3000C Pro
Serial Number: 2945
Frequency:
1 or 3 MHz
Test Date:
2/1/04
ERA:
5.0 cm
2
BNR:
2.75:1
