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Absorption of ultrasound/Gain Absorption of ultrasound means that lower tissues return less ultrasound (some absorbed as heat, some reflected/refracted out of field of probe To ensure a uniform picture (so deeper areas not darker), ultrasound uses Time Gain Compensation (TGC) TGC applies progressively increasing amplitude ob'Dm5jpWt!OZ:0m>fs&-R/7"I\HX#\.7!i beus%%@]hZYm6\Rf6_*bP:!FT"-\Hh/#R! 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Basic Ultrasound Physics Sound is a series of pressure waves propagating through a medium One cycle of the acoustic wave is composed of a complete positive and negative pressure change The wavelength is the distance traveled during one cycle The frequency of the wave is measured in cycles per second or Hertz (cycles/s, Hz) (Illustration 1) Mn_3co=cZH2?WC5i$koY%SV8A:55$LZ8L'#Klc%K5P>:d> 50 0 obj Pm#*Q`Vo8/^lT2hC^R-E`7.inVG5%R"SZnm_[4AcEsc#TUartna&J0@]6#L,.JGeG rKTV)a09W7q^X4H"FN3/K%''n0&s4AClo$dU2Zab;RnV]C'rGpfhf,$R/>@)!t582[UI:ckC`KpP:P^j!NLqc10 41 0 obj >> Basics of Ultrasound ! @kD]8o&''rT;L"e)1,Xsi[b:_^&BqX#]D%"@?G/""m#:P6O$6a17, ;kG3Hk;^GNcgo*3p)]IE8+EW\1iFZJUp*c09sXSa4;_@k">6ubJA:duU!m4:"M/J >> kVh:,5,,-$U4Urkn+5/PNaA8q:OYgYU'^927@S/Eh3,[oE Int J Ultrasound Appl Technol Periop Care. 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