____ is defined as specific area or location where Doppler shift info is being obtained.
A. spectral broadening
B. nyquist limit
C. sample volume
D.
... [Show More] spectral window
C. sample volume
Spatial resolution is:
A. the minimum reflector separation required to produce separate echos.
B. highest with linear phased arrays.
C. the weakest reflected signal the transducer can receive
D. another term for slice thickness resolution
A. the minumum reflector separation required to produce echos
Which of the following Doppler angles would lead to the most significant error in estimation of the flow velocity?
A. 25
B. 45
C. 65
D. 80
D. 80
which of the following necessary machine setting with performing a contrast evolution of the heart?
A. harmonic imaging off
B. mechincal index set to 0.3 or lower
C. mechanical index set to 1.0 or greater
D. Low PRF color Doppler setting
B. mechanical index set to 0.3 or lower
How many pulses are needed per scan line in order to generate a single frame of color Doppler?
A. 6
B. 1
C. 16
D. 3
D. 3
The rectus abdominis muscles are associated with ____, while the diaphragm is associated with ______.
A. shadowing, enhancement
B. comet tail, ring down
C. refractive shadowing, lobe artifact
D. refraction artifact, mirror image artifact
D. refraction artifact, mirror image artifact
When evaluating a suspected arterial stenosis, a doppler angel of ____ degrees will produce the most accurate flow velocity.
A. 0
B. 30
C. 60
D. 90
A. 0
Increasing the angle of electronic steering causes _____ production of lobe artifact.
A. increased
B. decreased
C. no change
D. limited
A. increased
Put the following media in order from lowest to highest according to their acoustic impedance:
Bone
Air
Liver
Blood
Air, blood, liver, bone
Even and odd harmonic frequencies are created by:
A. alternating current to different piezoelectric elements in the transducer array
B. non-linear sound wave propagation
C. variable timing of the firing of the piezoelectric elements
D. turbulent flow in the blood vessel
B. non-linear sound wave propagation
what type of transducer array has the fewest numbers of elements?
A. linear phased array
B. annular array
C. curvilinear sequential array
D. mechanical transducer
B. annular array
______ artifact is caused by refraction and results in subtle image degradation.
A. comet tail
B. scatter
C. misregistration
D. multipath
D. multipath
Which of the following will improve lateral resolution at all depths on the image?
A. dynamic transmit focusing
B. dynamic receive focusing
C. decrease probe frequency
D. use >3 focal zones
B. dynamic receive focusing
which of the following units is used to describe beam intensity?
A. dB/cm/MHz
B. dB
C. mW/cm 2
D. mW
C. mW/cm 2
which of the following parameters cannot be evaluated by the AIUM test object?
A. depth calibration
B. distance calibration
C. gray scale
D. azimuthal resolution
C. gray scale
ultrasound hybrid imaging refers to :
A. using 2D ultrasound imaging with microbubble contrast
B. automated ultrasound imaging
C. fusion of real time ultrasound imaging with another modality to form a new evaluation technique
D. comparing ultrasound images to a CT exam on a PACS system
C. fusion of real time ultrasound imaging with another modality to form a new evaluation technique [Show Less]