Penetration
Attenuation
Reflection
Ultrasound waves, depending on amount of energy, will pass through a medium to a certain depth.
As ultrasound waves travel through medium they continually losing energy to medium that they pass.
The rest of waves' energy after travelling through medium is reflected back toward their source.
Equals to "echo" of submarine sonar.
Enable image generation on ultrasound machine.
Eventually energy will not be enough to reflect back to machine, therefore no image.
Ultrasound: physics and knobology
Ultrasound: Signs
Ultrasound: Probe selection
Nerve Block: Median
Ultrasound: Probe orientation
Ultrasound: Tendons
SCVMC:Main
Santa Monica:Antibiotics in Sepsis