SPI

C - Answer What is dynamic aperture? A.aperture that varies with transmit frequency B.aperture that decreases as a function of time C.aperture that increases with increasing focal length D.aperture that changes as a function of frame rate A - Answer to which acoustic variable is penetration depth inversely related? A.frequency B.wavelength C.period D.propagation speed B - Answer which imaging mode requires a broadband transducer? A.continuous wave doppler B.Pulsed wave doppler ...

Example of nonspecular reflector Correct Answer: red blood cells What happens to spatial pulse length when frequency increases? Correct Answer: decreases Axial resolution is dependent on? Correct Answer: wavelength Lateral resolution is dependent on? Correct Answer: beam diameter Where does the beam of an unfocused transducer diverge? Correct Answer: Fraunhofer zone Reverberation artifacts are a result of Correct Answer: two or more strong reflecting surfaces True/False: ...

When you adjust pulse repetition frequency, you are changing: Correct Answer: The number of pulses per second When sound strikes a specular reflector at an oblique angle, the angle of reflection is: Correct Answer: Equal to the angle of incidence Which of the following describes diffuse reflection? Correct Answer: The reflected beam is scattered in various directions Which sound beam frequency would exhibit the greatest intensity loss with increasing depth? Correct Answer: 10 mhz (t...

What action below would be most in keeping with the ALARA principle while performing a diagnostic ultrasound examination? A: Allow multiple students to scan an obstetrical patient because the fetus is in a good position for imaging. B: Prolong the sonogram to make videos of the fetus for each family member. C: Complete the diagnostic scan in a timely fashion at the lowest output power that achieves a quality image. D: Maximize the acoustic output to brighten the overall image. E: Extend...