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What determines the resonant frequency of a pulsed wave transducer?
What determines the resonant frequency of a pulsed wave transducer?A . Element thickness and pulse repetition frequencyB . Element diameter and speed of sound in elementC . Element diameter and element thicknessD . Element thickness and speed of sound in elementView AnswerAnswer: D Explanation: The resonant frequency of a pulsed...
What is the Doppler shift at 0 degrees?
A Doppler shift is 10,000 Hz at an angle of flow of 60 degrees. What is the Doppler shift at 0 degrees?A . 20,000 HzB . 10,000 HzC . 5,000 HzD . 2,500 HzView AnswerAnswer: A Explanation: depends on the angle between the ultrasound beam and the direction of blood...
What is a potential negative consequence of using a high wall filter?
What is a potential negative consequence of using a high wall filter?A . Desired signal may be eliminatedB . Aliasing could occurC . Penetration is reducedD . Too much noise may appear on the imageView AnswerAnswer: A Explanation: A high wall filter is used in Doppler ultrasound to eliminate low-frequency...
Which settings will lead to the highest temporal resolution?
Which settings will lead to the highest temporal resolution?A . 45-degree sector width, 4 cm scan depth, color Doppler offB . 60-degree sector width, 5 cm scan depth, color Doppler offC . 45-degree sector width, 4 cm scan depth, color Doppler onD . 60-degree sector width, 5 cm scan depth,...
Which resolution capability is most affected by spatial pulse length?
Which resolution capability is most affected by spatial pulse length?A . ElevationalB . TemporalC . LateralD . AxialView AnswerAnswer: D Explanation: Axial resolution refers to the ability to distinguish two structures that are close to each other along the path of the ultrasound beam. Spatial pulse length (SPL) is the...
What is effected by increasing the color scale?
What is effected by increasing the color scale?A . The Nyquist limit is increasedB . More colors are displayedC . The color box width decreasesD . The color priority decreasesView AnswerAnswer: A Explanation: The Nyquist limit, which is the maximum detectable velocity before aliasing occurs, is directly related to the...
Which artifact may be caused by incorrect color Dopplergain setting?
Which artifact may be caused by incorrect color Dopplergain setting?A . Bleed/BlossomingB . Clutter/HazeC . TwinkleD . AliasingView AnswerAnswer: A Explanation: Incorrect color Doppler gain settings can cause the artifact known as bleed or blossoming. When the color Doppler gain is set too high, it can cause the color signal...
Which resolution is degraded when utilizing multiple transmit focal zones?
Which resolution is degraded when utilizing multiple transmit focal zones?A . TemporalB . LateralC . AxialD . ElevationalView AnswerAnswer: A Explanation: When utilizing multiple transmit focal zones, the ultrasound system must perform multiple transmissions at each focal depth. This process requires more time for data acquisition, which in turn decreases...
What adjustment is needed to optimize the color in the image below?
What adjustment is needed to optimize the color in the image below? A . Decrease gainB . Increase wall filterC . Decrease persistenceD . Increase pulse repetition frequencyView AnswerAnswer: D Explanation: Increasing the pulse repetition frequency (PRF) helps to optimize the color Doppler imaging by reducing aliasing. Aliasing occurs when...
Which artifact is seen as a result of an increase in echo amplitude in the tissue located distal to an anechoic structure?
Which artifact is seen as a result of an increase in echo amplitude in the tissue located distal to an anechoic structure?A . Mirror imageB . ReverberationC . Comet tailD . EnhancementView AnswerAnswer: D Explanation: Enhancement artifact occurs when an anechoic (or low-attenuation) structure, such as a cyst or fluid-filled...
