SPI Physics

Front

What is the relationship between frequency and wavelength?

Back

Frequency and wavelength are inversely related.

Front

What is the formula for wavelength?

Back

Wavelength = Propagation speed / Frequency.

Front

What is refraction in ultrasound?

Back

Refraction is the bending of a sound wave as it passes through two media with different propagation speeds

Front

What is the purpose of ultrasound gel?

Back

Ultrasound gel functions to eliminate air gaps between the transducer and the skin, reducing the impedance mismatch and facilitating sound transmission

Front

What is the effect of increasing the PRF?

Back

Increasing the PRF increases the risk of range ambiguity but improves temporal resolution

Front

What is acoustic impedance?

Back

Acoustic impedance is the resistance to sound propagation, calculated as the product of density and propagation speed.

z=pc

Front

What is the PRP?

Back

PRP is the time from the start of one pulse to the start of the next, inversely related to PRF

Front

What is the significance of the dead zone in ultrasound?

Back

The dead zone is the area close to the transducer where imaging is not reliable due to high-intensity initial pulses.

Front

What is the propagation speed of sound in bone?

Back

The propagation speed of sound in bone is approx 4080m/s, which is much faster than the speed of sound in soft tissue

Front

What is spectral broadening in Doppler ultrasound?

Back

Spectral broadening is an artifact that causes the spectral waveform to widen, and may indicate stenosis or turbulent flow. Increasing the angle of the Doppler interrogation can also result in spectral broadening