24 OMNISOUND
®
3000C PRO USER MANUAL
COPYRIGHT © 2001 - 2017, ACCELERATED CARE PLUS CORP., ALL RIGHTS RESERVED
Temperature Mode of Operation / Delta T Mode
In order to achieve repeatable thermal effects of ultrasound in tissue the dosage of the ultrasound beam must be
carefully controlled. This involves accurate determination of the treatment area, couplant to be used, frequency of
operation, BNR and the desired temperature increase required to achieve appropriate therapeutic effects in the tissue.
LEHMAN and other investigators have categorized the effects of ultrasound on tissue as being of a mild or 1 degree
C increase, moderate or 2 degree C increase or vigorous or 4 degree C heating effect above the baseline tissue
temperature of 37.5 degrees C. Typically vigorous heating is used to treat connective tissue contracture and scar
tissue while moderate and mild heating are used in pain control, sub acute and chronic inflammatory conditions and
for muscle spasm reduction.
The patented Delta T mode of the Omnisound
®
3000C Pro is a proprietary software system that is used in
conjunction with the ultrasound system to ensure consistent dosimetry.
To use the system proceed as follows:
1.
After the unit has completed self-test and the default screen appears depress the TEMPERATURE MODE SET
UP button on the generator or the ΔT button on the transducer. The screen will change to the temperature mode
select screen. Then press the SELECT button to select the Delta T mode desired.
2.
Select the couplant being used, if other than ultrasound gel, by using the set parameter switches (normally this is
not used when ultrasound gel is selected).
3.
Select the frequency of 1 or 3MHz.
NOTE:
3MHz is the default frequency so if the depth is less than 1" or 2.5cm for the target tissue then you will
not need to change the frequency. If the depth is greater than 1", select the 1MHz frequency.
4.
Press the ΔT button on the transducer, or the TEMP MODE SETUP button on the screen to go to the main ΔT
run screen. Default is 4 ΔT.
5.
To start the treatment, supply adequate couplant, apply the transducer to the patient and increase the power. As
you do so you will notice that the timer will change from 15 minutes to a lower value. This will only occur if
the dose is sufficient to reach the desired temperature within the treatment time. Adjust the output intensity -
typically to a range of 0.5W/cm
2
to 1W/cm
2
is used based on patient comfort. The treatment time will
automatically adjust based on the power setting chosen to provide the correct dosage. As the power is increased
the time decreases and vice versa. If the patient experiences any discomfort decrease the power by a small
amount (0.1 - .2W/cm
2
) and note if the pain is reduced. If so continue the treatment, otherwise decrease the
power again. The treatment time will automatically increase to compensate for the decreased power level.
Repeat again if the sensation is still too hot following the reduction of power.
NOTE:
The delta T mode of operation is calibrated for muscle not in proximity of bone. If the ultrasound
application at 3MHz is within 1 cm of bone the 2 degree delta T mode will heat at a rate of 4 degrees, or the 1
degree delta T mode will heat at 2 degrees. Within .5cm proximal to bone, the 1 degree Delta T mode will heat
at 4 degrees due to the reflection of the ultrasound field from the bone back into the overlying tissue.
6.
The temperature display shows the projected temperature increase over time based on the selected parameters
for treatment. Although it does not represent actual temperature it should be a close approximation if the
treatment is correctly applied.
7.
Use a slow (approximately 1cm per second) linear or circular motion with the transducer. The treatment area
should be restricted to two of the transducer sizes, which approximates 2 effective radiating areas (ERA). This
is absolutely mandatory if the correct relationships in the calculation equations are to be met.
8.
When the treatment is complete the timer will beep, the output will power down. To treat another area of 2 ERA
simply push the up power control on the transducer and the mode will be set up automatically at the originally
set default parameters. To change the defaults select a new protocol from the front panel switches.
