3 Attenuation Attenuation is a decrease in wave amplitude as it travels through a medium. The attenuation of ultrasound in soft tissue is about 0.8 dB/(MHz-cm), indicating that the extent of attenuation depends on the distance traveled and the frequency of insonation. The units of the attenuation coefficient directly show the greater attenuation of high-frequency ultrasound beams. In soft tissue, 80% or more of the total attenuation is caused by absorption of the ultrasound wave, thereby generating heat. Time gain compensation (TGC) adjusts for attenuation of an ultrasound beam as a function of depth. When TGC is properly adjusted, images of similar reflectors appear the same regardless of depth. Only gold members can continue reading. Log In or Register to continue Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related posts: Doppler Imaging Needle Imaging Veins Ulnar Nerve Block Popliteal Block Interscalene and Supraclavicular Blocks Stay updated, free articles. Join our Telegram channel Join Tags: Atlas of Ultrasound-Guided Regional Anesthesia Expert Consult - Mar 5, 2016 | Posted by admin in ULTRASONOGRAPHY | Comments Off on Attenuation Full access? Get Clinical Tree
3 Attenuation Attenuation is a decrease in wave amplitude as it travels through a medium. The attenuation of ultrasound in soft tissue is about 0.8 dB/(MHz-cm), indicating that the extent of attenuation depends on the distance traveled and the frequency of insonation. The units of the attenuation coefficient directly show the greater attenuation of high-frequency ultrasound beams. In soft tissue, 80% or more of the total attenuation is caused by absorption of the ultrasound wave, thereby generating heat. Time gain compensation (TGC) adjusts for attenuation of an ultrasound beam as a function of depth. When TGC is properly adjusted, images of similar reflectors appear the same regardless of depth. Only gold members can continue reading. Log In or Register to continue Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related posts: Doppler Imaging Needle Imaging Veins Ulnar Nerve Block Popliteal Block Interscalene and Supraclavicular Blocks Stay updated, free articles. Join our Telegram channel Join