C - CORRECT 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 - CORRECT to which acoustic variable is penetration depth inversely related?
A.frequency
B.wavelength
C.period
D.propagation speed
B - CORRECT which imaging mode requires a broadband
transducer? A.continuous wave doppler
B.Pulsed wave doppler
C.color flow imaging
D.harmonic imaging
B - CORRECT what is the doppler shift frequency?
A.recieved ultrasound frequency multiplied by the transmitted ultrasound frequency
B.difference between the transmitted ultrasound frequency and the received
ultrasound frequency
C.sum of the transmitted and received ultrasound frequencies
D.ratio of the transmitted ultrasound frequency to the received ultrasound frequency
A - CORRECT what is the potential effect of increasing the pulse repetition
frequency(PRF)?
A.Depth ambiguity
B.Decreased frame rate
C.Poor spatial resolution
D.Decreased penetration
B - CORRECT what is an advantage of using pulsed wave doppler
compared to continuous wave doppler?
A. higher echo sensitivity
B.ability to select sample depth
C.decreased display of aliasing
D.improved temporal
resolution
D - CORRECT what affects the beam width in the near
field?A.Pulse repetition frequency
B. Pulse duration
C.Frame rate
D.Transducer aperture
, D - CORRECT what is the advantage of using pulsed-wave doppler versus
continuous-wave doppler?
A.allows measurement of higher velocities
B.increases range ambiguity
C.reduces the potential for aliasing
D.provides depth specificity
D - CORRECT which parameter is target group C evaluating based on the image?
A.dead zone
B.dynamic range
C.axial resolution
D.Horizontal distance accuracy
A - CORRECT In this image, which target group is used to evaluate dead zone?
C - CORRECT which ultrasound parameter directly affects an ultrasound beam's
intensity?
A.TGC
B.operating frequency
C.Output power
D.Frame rate
D - CORRECT the center frequency of a transducer depends primarily upon
whichcharacteristics of the crystal?
A. width
B.length
C.spacing
D.thickness
C - CORRECT which factor limits image frame
rate?A.transducer operating frequency
B. Sample volume size
C.Speed of sound in tissue
D.Spatial pulse length
A - CORRECT when using a 5MHZ transducer, in which tissue is the ultrasound
wavelength shortest?
A.fat
B.blood
C.bone
D.muscle
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