SPI ultrasound physics review

What is frequency determined by? - Answer- The source, thickness of piezoelectric element and propagation speed to a lesser degree Thicker element is equal to ________ frequencies - Answer- Lower What is the reciprocal of frequency and what is the symbol - Answer- Period, T The time it takes for 1 cycle to occur - Answer- Period What is propagation speed determined by - Answer- Stiffness and density of the medium Propagation speed of sound through soft tissue - Answer- 1,540 m/s Increasing the stiffness of a tissue does what to the propagation speed? - Answer- Increases Increasing the density of a tissue does what to the propagation speed? - Answer- Decreases Propagation speed of tissues from slowest to fastest - Answer- Air, fat, water, liver, blood, muscle, bone What is the distance over which one cycle occurs? - Answer- Wavelength What happens to frequency when you increase the wavelength? - Answer- Decreases What is the wavelength symbol - Answer- Lambda What is the wavelength equation? - Answer- Propagation speed divided by the frequency Units of wavelength - Answer- Mm, m, km What is wavelength determined by? - Answer- Source and medium What describes the strength of the sound wave? - Answer- Amplitude What happens to a beam as it travels? - Answer- Decreases in amplitude and intensity due to attenuation What does amplitude represent on the chart of a wave? - Answer- The height of a vibration