First-trimester sonography: Is the fetus
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Eyal Sheiner; Ilana Shoham-Vardi; Michael J. Hussey; Xavier Pombar; Howard T. St
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Article
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2007
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John Wiley and Sons
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English
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## Abstract ## Purpose. As a form of energy, diagnostic ultrasound has bioeffects on living tissues. The thermal index (TI), TIS (TI for soft tissue), TIB (TI for bone), TIC (TI for cranial bone) expresses the potential for rise in temperature at the ultrasound beam's focal point. The mechanical i