SPI mock exam..docx

Reducing the likelihood of bioeffects from acoustic energy is the mission of the: A. Nyquist limit B. Reynolds number C. Huygens principle D. ALARA principle E. Poiseuille principle - correct answer D. ALARA principle The number of cycles in a pulse directly related to the: A. Duty factor B. SPL C. operating frequency D. PRF E. propagation speed of the medium - correct answer B. SPL The Doppler shift frequency is proportional to the: A. Cosine values B. Doppler angle C. Operating frequency D. Velocity of the reflector E. Propagation speed if the medium - correct answer D. Velocity of the reflector In the Fraunhofer zone, the beam: A. Width diverges B. Is conical in shape C. Intensity is greatest D. Intensity is inconsistent E. Widens towards the focal zone - correct answer A. Width diverges Artifacts consisting of parallel equally spaced lines are characteristic of: A. Multipath B. Grating lobes C. Reverberation D. Range ambiguity E. Acoustic shadowing - correct answer C. Reverberation An increase in reflection amplitudes from reflectors that lie behind a weakly attenuating structure is called: A. Comet tail artifact B. Shadowing C. Slice thickness artifact D. Acoustic enhancement E. Propagation speed error - correct answer D. Acoustic enhancement The ratio of the largest power to the smallest power the ultrasound system can handle describes: A. Amplitude B. Bandwidth C. Compensation D. Dynamic range E. Contrast resolution - correct answer D. Dynamic range Axial resolution directly related to the: A. Penetrating depth B. SPL C. Temporal resolution D. Tx diameter E. Operating frequency - correct answer E. Operating frequency When voltage is applied to the piezoelectric crystal, the crystal will: A. Vibrate B. Increase in size C. Decrease in size D. Remain unchanged E. Increase or decrease according to the polarity - correct answer E. Increase or decrease according to the polarity The resistance of the arterioles accounts for about what percentage of the total systemic resistance? A. 10% B. 25% C. 33% D. 30% E. 75% - correct answer D. 30% Rayleigh scattering is most likely to occur when encountering the: A. Liver B. Pleura C. Diaphragm D. RBC E. Urinary bladder - correct answer D. RBC Which color always represents the baseline in color Doppler imaging? A. Red B. Blue C. White D. Black E. Ywllow - correct answer D. Black Which of the following correctly defines acoustic frequency? A. Length of one cycle B. Number of pulses in a cycle C. Number of cycles in a second D. Strength of the compression wave E. Amount of time to complete one cycle - correct answer C. Number of cycles in a second What component is not present in A-mode but is necessary for B-mode imaging? A. Clock B. Display C. Amplifier D. Transducer E. Scan converter - correct answer E. Scan converter Graying lobes are caused by: A. High frame rates B. Dynamic focusing C. Reverberation artifact D. Interference phenomenon E. Spacing of array elements - correct answer E. Spacing of array elements Clutter can be reduced using which of the following controls? A. Wall filter B. Smoothing C. Baseline shift D. Dynamic range E. PRF - correct answer A. Wall filter Regions of high density in an acoustic wave are termed: