Doppler
Which Doppler mode displays blood flow direction and average velocity in color?
What is color doppler?
Multiple equally spaced echoes are called:
What is reverberation?
The ultrasound system assumes sound travels at:
What is 1540 m/s?
Which control changes brightness throughout the entire image?
What is overall gain?
Which resolution distinguishes structures along the beam axis?
What is axial resolution?
Aliasing occurs when:
What is doppler shift exceed the Nyquist limit?
A cyst appears brighter behind it because of:
What posterior enhancement?
The equation for wavelength is:
What is propagation speed / frequency?
Which control adjusts brightness at different depths?
What is TGC?
Axial resolution equals:
What is SPL / 2?
Which adjustment increases the Nyquist limit?
What is increase the PRF?
A gallstone commonly produces:
What is acoustic shadowing?
If frequency increases, wavelength:
What is decreases?
Increasing line density improves:
What is lateral resolution?
Lateral resolution depends primarily on:
What is beamwidth?
Which Doppler mode measures the highest velocities without aliasing?
What is CW doppler?
The liver appears duplicated above the diaphragm because of:
What is mirror image artifact?
Which is NOT a cause of attenuation?
A. Absorption
B. Reflection
C. Scattering
D. Refraction
What is refraction?
Which adjustment increases frame rate?
A. Increase depth
B. Increase line density
C. Increase focal zones
D. Narrow the sector width
What is narrow the sector width?
Pulse duration mainly affects:
What is axial resolution?
Which is NOT a method for reducing aliasing?
A. Increase PRF
B. Lower transmit frequency
C. Increase persistence
D. Shift the baseline
What is increased persistence?
Refraction occurs because sound:
What is changes direction entering tissue at an angle?
Speed of sound depends primarily on:
What is stiffness and density?
Persistence improves:
What is contrast resolution?
Where is lateral resolution best?
What is at the focal zone?