Ultrasound Physics
Welcome
Ultrasound Basics
Vibration and Wave
Ultrasound Parameters
Medium Acoustic Property
Ultrasound Reflection
Ultrasound Refraction
Ultrasound Scattering
Ultrasound Attenuation
Ultrasound Application
Ultrasound Transducer
Piezoelectric Effect
Transducer Cosntruction
Array Transducer
Beamforming
Ultrasound Beamformation
Beam Focus
Beam Steering
Imaging
Pulse-echo Method
Imaging Method
Imaging Resolution
Ultrasound Imaging Artifacts
Signal and Circuit
Unipolar Transmitter
Bipolar Transitter
Transceiverg
Time Gain Control
Conditioning
Preprocessing and Postprocessing
Flow Dection
Doppler Effect
Continue Wave Doppler (CW)
Pulse wave Doppler(PW)
Color Flow Imaging
Safety
Intensity
Mechanical Index
Thermal Index
Cavitation
Regulations
Ultrasound Attenuation
Ultrasound Attenuation
Causes of ultrasound attenuation:
Scattering
Absorption
Reflection
Ultrasound attenuation values in type of tissue: Water has minimal attenuation to ultrasound. Blood has an attenuation of 0.03dB/cm/
MHz.
Soft tissue has a value of 0.3dB/cm/
MHz.
Air, bone, stone, and metal will normally attenuate all the imaging ultrasound beam energy they encountered.
Ultrasound attenuation values increase with frequency.
Effects on image: Far field image will look darker without compensation. Resolution in far field is lower than near field due to the downshift of the center frequency of the echo.