SPI Practice Exam,.docx

Which term describes blood flow changes in response to respiration? A. Phasic B. Parabolic C. Spontaneous D. Pulsatile - correct answer Phasic What is demonstrated in this image produced by a linear array to placed on a uniform tissue-mimicking phantom? A. Time gain compensation not set properly. B. System has low dynamic range. C. Transducer crystals are damaged. D. Focus control is malfunctioning. - correct answer Transducer crystals are damaged What is dynamic aperture? A. Aperture that varies with transmit frequency B. Aperture that deceases as a function of time C. Aperture that increases with increasing focal length D. Aperture that changes as a function of frame rate - correct answer Aperture that increases with increasing focal length Which variable can cause an acoustic shadow artifact? A. Small acoustic impedance mismatch B. Refraction C. Perpendicular incidence D. Low attenuation - correct answer Small acoustic impedance mismatch What control improved the effects of attenuation? A. Dynamic range B. Pulse Inversion C. Multiple focal zones D. TGC - correct answer TGC What is the potential effect of increasing the PRF? A. Depth ambiguity B. Decreased frame rate C. Poor spatial resolution D. Decreased penetration - correct answer Decreased penetration How is lateral resolution determined for a pulse-echo system using a tissue-mimicking test object? A. By observing spaces between reflectors perpendicular to the beam B. By observing spaces between reflectors along the beam path C. By observing position of deepest visible reflector along the beam path D. By observing position of deepest visible reflector perpendicular to the beam path - correct answer By observing spaces between reflectors perpendicular to the beam According to ALARA guidelines, which parameter should be minimized? A. Transmit power B. Frequency C. TGC D. Overall gain - correct answer Transmit power Which statement is most acurate regarding surface rendering 3D ultrasound imaging? A. Improves accuracy of volume measurement B. Minimizes effect of attenuation artifacts C. Spatial resolution improve when using high resolution mesh D. Feature-based reconstruction store full 3D volume acquired - correct answer Minimizes effect of attenuation artifacts Which artifact is indicated by the arrows in this image? A. Shadow produced by the diaphragm B. Acoustic enhancement C. Comet tail D. Mirror image - correct answer Comet tail Which imaging modality can provide the most accurate measurement of tumor volume? A. Color Doppler B. B-mode C. A - mode D. M-mode - correct answer B-mode To which acoustic variable is penetration depth inversely related? A. Frequency B. Wavelength C. Period D. Propagation speed - correct answer Propagation speed Which Doppler angle to flow results in the greatest absolute Doppler shift? A. 0 degrees B. 15 degrees C. 45 degrees D. 60 degrees - correct answer 0 degrees What does coded excitation improve in addition to penetration? A. Lateral resolution B. signal - to - noise ratio C. Frame rate D. Dynamic range - correct answer Signal - to - noise ratio An increase in which parameter will improve the accuracy of velocity measurements with autocorrelation? A. Color field of view B. Packet size C. Wall filter setting D. Transmitted frequency - correct answer Color field of view Which imaging mode requires a broadband transducer? A. Continuous wave B. Doppler Pulsed wave C. Doppler Color flow imaging D. Harmonic imaging - correct answer Continuous wave Which ultrasound parameter directly affects an ultrasound beam's intensity? A. Time gain compensation B. Operating frequency C. Output power D. Frame rate - correct answer Output power With harmonic imaging, how does echo frequency relate to transmitted frequency? A. Half the transmitted frequency B. Equal to the transmitted frequency C. Twice the transmitted frequency D. Four times the transmitted frequency - correct answer Twice the transmitted frequency