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Electronic steering is most commonly applied to which of the following real time transducers?
Phased array
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How many lines of sight are sampled and displayed on the monitor in A-mode?
1
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While performing an obstetrical sonogram you wish to increase the frame rate to evaluate the fetal hearth. What should you do?
Decrease the sector with
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Blood vessels usually appear anechoic on the B-mode imaging because:
The reflection from the red blood cells is too weak to be displayed
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Which echo amplitude in the following illustration would produce the brightest dot on a B-mode display?
E
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Which of the following is NOT a limitation of M-mode scanning?
Motion lateral to the transducer is not displayed
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Which action would decrease frame rate?
Increasing acoustic scan line density
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In order for distance measurements to be accurate in an ultrasound tissue phantom, the phantom sound propagation speed must be:
1540 m/s
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You have expanded the image sector width to improve visualization of a large mass. What can you do to maintain the same temporal resolution you had before your adjustment?
Decrease the number of focal zones
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What information is present in the M-mode display?
Time, motion pattern, and amplitude
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With A-mode, the strength of the echo signal is represented by:
The height of the spike
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What information is present in the A-mode display?
Amplitude and reflector distance
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An M-mode display is most commonly used for what type of ultrasound imaging?
Cardiac
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A-mode display is most commonly used for what type of ultrasound imaging?
Ophthalmologic
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With an A-mode display, the internal contents of a simple cyst will appear as:
An area with no spikes
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What is an advantage of a water-path scanner?
Near-field reverberation are reduced
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What is a disadvantage of a water-path scanner?
Bubbles in the fluid can inhibit sound transmission into the body
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You are manipulating a volume dataset that was previously obtained on your patient. What is the maximum number of imaging planes that can be obtained from this dataset?
There is no limit
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While performing a sonographic exam, you increase both imaging depth and scan line density. These adjustments produce the following result:
Reduce temporal resolution
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What is an advantage of using a 3D/4D transducer with an automated sweep compared to a traditional transducer with a freehand sweep?
Measurement accuracy
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Which of the following does not affect the time required to create one image frame?
Transducer aperture
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Increasing the number of acoustic scan lines in one frame improves which of the following?
Lateral resolution
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You have decreased the image sector width. Which of the following will most likely change as a result of this adjustment?
Frame rate
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Which of the following ultrasound examinations would require the highest frame rate?
Cardiac
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Which of the following adjustments would NOT decrease frame rate?
Increasing the receiver gain
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When you increase the scanning depth, which of the following is automatically decreased by the system to avoid range ambiguity?
Pulse repetition frequency
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You are scanning an interface with a high acoustic impedance mismatch. How will this be display on the B-mode image?
A bright dot
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The A in A-mode stands for:
Amplitude
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The M for M-mode stands for:
Motion
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What component is necessary for a real time B-mode scanner but is not present in an A-mode scanner?
Scan converter
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