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ECE_3820_lecture_15_2011

ECE_3820_lecture_15_2011 - Echocardiography Shutao Wang...

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Echocardiography Shutao Wang 10-20-2011
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Outline Ultrasound basics Ultrasound imaging for cardiac applications A mode B mode (2D examination) M mode Doppler imaging Contrast agent imaging Other medical ultrasound applications
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Ultrasound Basics Mechanical energy that is transmitted or propagated through a medium by the vibration of molecules Frequency range: above 20kHz to several hundred MHz Medical ultrasound spectrum: 0.5 MHz – 10 MHz
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Ultrasound Basics The use of ultrasound in diagnosis of cardiac disease was first recognized in 1950’s Advantages of ultrasound imaging Safe (non-ionizing radiation) Real time Low cost & portable Disadvantages of ultrasound imaging Relatively poor resolution compared to CT/MRI Limited ability to image lung and brain
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Ultrasound Basics Compression vs. rarefaction Longitudinal waves vs. Transverse (shear) waves
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Ultrasound Basics Amplitude Wavelength Phase velocity Where ρ is density and K is compressibility Typical value: tissue c=1540m/s, water c=1480m/s Frequency Wave equation: 1 c K ρ = 1 f τ = c f λ =
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