Abstract
Tissue Harmonic Imaging (THI) is now a feature on almost all ultrasound systems, yet it has arrived on the ultrasound scene remarkably quickly. It appeared almost as a by-product of work on microbubble contrast agents in the mid-1990s, with commercial systems becoming available towards the end of that decade. Fortunately, although there are different ways of generating a THI image, this is one new technical development that is not hidden away behind a host of patented trademarks. Your scanner is likely to have a button labelled simply 'Harmonic', 'Tissue Harmonic' or 'THI'. This article will describe the principles, use and benefits of THI.
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