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Ultrasound bioeffects and safety

2009; SAGE Publishing; Volume: 224; Issue: 2 Linguagem: Inglês

10.1243/09544119jeim613

2041-3033

Gail ter Haar,

Ultrasound in Clinical Applications

The main mechanisms by which ultrasound can induce biological effects as it passes through the body are thermal and mechanical in nature. The mechanical effects are primarily related to the presence of gas, whether drawn out of solution by the negative going ultrasound pressure wave (acoustic cavitation), a naturally occurring gas body (such as lung alveoli), or deliberately introduced into the blood stream to increase imaging contrast (microbubble contrast agents). Observed biological effects are discussed in the context of these mechanisms and their relevance to ultrasound safety is discussed.