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Measuring ultrasound for better treatment of muscle injuries
Date:4/3/2013

A new tool developed at the National Physical Laboratory (NPL), the UK's National Measurement Institute, could help improve the quality of ultrasound treatment for soft tissue injuries such as muscle strains and ligament damage.

Ultrasound - high-frequency sound waves is used in physiotherapy to accelerate healing of tissue injuries. Ideally, the sound waves should be applied uniformly to the treatment site, but it is well-known that this does not happen in practice. This can affect quality of treatment and even cause damage.

NPL has developed a way to quickly map the intensity and distribution of ultrasound, allowing treatment heads to be used to administer the treatment more effectively. It will alert physiotherapists to sharp "hot-spots", allowing them to move the head to smooth the intensity or reject it where it could cause more harm than good. It also has potential for manufacturers, who could quickly test the effect that changes in design have on the intensity distribution.

During treatment, piezoelectric-based treatment heads convert electrical energy to mechanical energy, creating the vibrations needed to produce the ultrasound waves. These are transmitted into the target tissue with the aid of a thin layer of coupling gel.

The treatment heads actually vibrate in a complex pattern, in part due to the fact that they are highly resonant devices. This leads to variations in acoustic pressure and acoustic intensity over the area being treated, resulting in 'hot-spots', which can cause excessive heating and even damage to the tissue. Without carrying out the complex and time-consuming process of mapping the acoustic field, it is very difficult to tell exactly where the acoustic energy is going.

NPL scientists have come up with a solution to this problem by developing a simple tool to help visualise the distribution and intensity of the acoustic energy. The method works by using crystals that are thermochromic
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Contact: David Lewis
david@proofcommunication.com
07-890-678-102
National Physical Laboratory
Source:Eurekalert

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