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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...
What causes color flash artifact?
What causes color flash artifact?A . AliasingB . Tissue motionC . High velocity blood flowD . Strong reflectorView AnswerAnswer: B Explanation: Color flash artifact occurs due to tissue motion. This artifact is a type of color Doppler artifact that happens when there is movement of tissue or transducer, which causes...
What happens to the amount of attenuation if the path length is doubled?
What happens to the amount of attenuation if the path length is doubled?A . QuadrupledB . DoubledC . HalvedD . QuarteredView AnswerAnswer: B Explanation: Attenuation in ultrasound is directly proportional to the path length. If the path length is doubled, the amount of attenuation is also doubled. Attenuation refers to...
Which type of resolution will be improved by decreasing the depth of field?
Which type of resolution will be improved by decreasing the depth of field?A . LateralB . TemporalC . AxialD . ElevationalView AnswerAnswer: A Explanation: Lateral resolution refers to the ability to distinguish two structures that are side by side. It is dependent on the width of the ultrasound beam. By...
Which factor does a string phantom evaluate?
Which factor does a string phantom evaluate?A . Two-dimensional resolutionB . Intensity valuesC . Flow velocityD . Slice thicknessView AnswerAnswer: C Explanation: A string phantom is designed to evaluate the accuracy of Doppler ultrasound systems, specifically in measuring flow velocity. It consists of a moving string or filament that mimics...
What is an advantage of power Doppler over color Doppler?
What is an advantage of power Doppler over color Doppler?A . Accurate velocity informationB . Increased frame rateC . Diminished flash artifactD . Less angle dependentView AnswerAnswer: D Explanation: Power Doppler, unlike color Doppler, is less angle dependent because it detects the strength of the Doppler signal rather than the...
