QUESTIONS AND CORRECT ANSWERS
|AGRADE
What angle of insonation to blood flow produces the maximum doppler shift?
A. 180
B. 150
C. 90
D. 45 - ANSWER>>D. 45
Which scenario will produce no doppler shift to the receiver?
A. Source and receiver moving at the same speed and direction
B. Source moving backward toward the receiver
C. Source moving away from receiver
D. Receiver moving toward source - ANSWER>>A. Source and receiver moving at
the same speed and direction
Which condition must be present for refraction to occur?
A. The presence of a strong specular reflector
B. the presence of several small reflectors
C. A difference in tissue propagation speeds
D. A change in the angle of reflection - ANSWER>>C. A difference in tissue
propagation speeds
What is the most common cause of localized vertical nonuniformity in a real-
time B-mode image?
A. Improper time gain compensation
B. Defective transducer elements
C. Faulty preamplifier
D. Malfunctioning scan converter - ANSWER>>B. Defective transducer elements
, Which frequency is best to evaluate structures lying 1 to 2 cm from the
transducer?
A. 2 MHz
B. 4 MHz
C. 6 MHz
D. 8 MHz - ANSWER>>D. 8 MHz
Which technique utilizes frequency modulation of the transmitted pulse to
improve signal-to-noise ratio?
A. Apodizaiton
B. Panoramic imaging
C. Coded excitation
D. Spatial compounding - ANSWER>>C. Coded excitation
Which control allows adjustment for attenuation at specific depths?
A .Time gain compensation
B. Depth
C. Output power
D. Dynamic range - ANSWER>>A .Time gain compensation
Which technique increases the sharpness of high contrast boundaries?
A. Edge enhancement
B. Interpolation
C. Smoothing
D. Frame averaging - ANSWER>>A. Edge enhancement
Which setting of an ultrasound system gives the sonographer the ability to
display both strong and weak echoes?
A. Dynamic range
B. Resolution
C .Range calibration
D .Sensitivity - ANSWER>>B. Resolution