Higher the frequency the less penetration. Only in a few special cases does a 2 mhz work better such as on very overweight mothers when the fetus lies very deep.
Sound waves faster 3x faster than 1 mhz deep uslow freq.
Is 1 mhz or 3 mhz depth for us. As the frequency increases from 1 to 3 mhz the depth of penetration decreases ie. The effective penetration depth is also related to frequency. The classic therapeutic frequency of 1 mhz penetrating deep into the tissue is mainly used for treatment of the structures such as joints and tendon whereas the frequency of 3 mhz affects cutaneous and subcutaneous tissue and is therefore an.
1 mhz 3 mhz muscle 9 0 mm 3 0 mm fat 50 0 mm 16 5 mm tendon 6 2 mm 2 0 mm as it is difficult if not impossible to know the thickness of each of these layers in an individual patient average half value depths are employed for each frequency 3 mhz 2 0 cm 1 mhz 4 0 cm. A 3 mhz has also been proven to work well throughout the pregnancy. A 1 mhz ultrasound frequency is often used to treat deeper tissues ranging from 2 5 to 5 0 cm in depth 8 whereas the 3 mhz ultrasound frequency is used to treat more superficial tissues of up to.
It is important to remember that higher frequencies of ultrasound have shorter wavelengths and are absorbed attenuated more easily. Near and far fields. It is known that 1mhz and 3mhz are absorbed at different rates in the tissues and therefore have different penetration depths.
Ultrasound frequencies in diagnostic radiology range from 2 mhz to approximately 15 mhz. We provide 2 mhz probes as well so if you are unsure about which on to use consult with one of our customer care specialists and they will help you determine. The tables in this section list some typical materials and thickness ranges that can be measured with ultrasonic gages using specific transducers and appropriate instrument setup.
Within this spectrum space there are two non overlapping channels allocated both with a width of 20 mhz. The penetration depth of kilohertz us is expected to be in excess of 20 times greater than mhz ultrasound. âž 1 mhzâ â â â â â â deep up to 5 cm.
It is contraindicated for less than2â around the pacemaker. â discuss a problem of placebo vs placebo studies. The depth of penetration is important if the ultrasound treatment is on an ankle knuckle elbow tmj temporo mandibular joint knee or other area that is close to the surface that is being treated.
50 mhz of spectrum from 4940 mhz to 4990 mhz wlan channels 20 26 are in use by public safety entities in the united states. 1 mhz vs 3mhz ultrasound. The medio sono has been designed to support both 1 mhz and 3 mhz ultrasound heads.