Accelerated Care Plus OMNISOUND 3000C PRO User Manual page 26

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OMNISOUND 3000C PRO USER MANUAL 23
Monitoring of Delivered Power or Intensity
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The Omnisound 3000C Pro power meter displays the ultrasonic power level to be delivered to the patient under
proper coupling conditions. First apply an ultrasound couplant to the treatment area. The output control (up power
arrow) should then be increased to the desired power or intensity level. Power should be reduced prior to
decoupling to avoid overheating of the transducer when used. The thermal shutdown system is provided on all
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Omnisound 3000C Pro transducers to prevent thermal damage to the transducer. Appropriate warnings will be
displayed on the main operating screen should this occur. Power may be restored when the head is properly re-
coupled to the patient or following cool-down should overheating occur. If little coupling is occurring in the
treatment area due to the size of the area, underwater application technique may be indicated. It is poor practice to
allow continuous overheating of the transducer.
Ultrasound Transmission and Absorption
When ultrasonic energy is applied to the tissue it is absorbed in varying degrees. This absorption of energy can
increase tissue kinetic energy leading to increased temperature or the formation of cavitation or acoustic
microstreaming.
It is known that different tissue types absorb ultrasound differently and for this reason the modality has the ability to
selectively treat certain tissues due to their greater energy absorption. The absorption coefficient describes the
degree of absorption by the tissue and is approximately equal to the frequency in the 1-4 MHz range. For this
reason, ACP uses both 1.0 and 3.0 MHz ultrasonic outputs using an exclusive feedback control system through its
treatment transducer. The use of these two frequencies allows greater or less attenuation of the beam, for example,
1.0MHz penetrates approximately 3 times more than 3.0MHz ultrasonic beams. This may be helpful in selecting
intensity and time for ultrasonic therapy applications. Due to this reason the patient will generally experience much
faster heating with 3MHz ultrasound and dosage or treatment time may have to be reduced to avoid overheating of
the tissue.
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