SPI

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?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?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?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?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...

What is the primary reason to use compression?A . Increase line densityB . Reduce the focal regionC . Improve the axial resolutionD . Adjust the contrast resolutionView AnswerAnswer: D Explanation: Compression in ultrasound imaging adjusts the range of grayscale displayed, affecting the contrast resolution. This function allows sonographers to enhance...

During 3-D volume acquisition, the quality of the images is most dependent upon which factor?A . Number of slices acquiredB . Power outputC . Rendering method utilizedD . Speed of post-processing image compressionView AnswerAnswer: A Explanation: During 3-D volume acquisition in ultrasound, the quality of the images is most dependent...

Which factor affects temporal resolution?A . Display depthB . Time gain compensationC . Overall gainD . Log compressionView AnswerAnswer: A Explanation: Temporal resolution refers to the ability of an ultrasound system to distinguish between events occurring closely in time. It is primarily affected by the frame rate, which is the...

Which target group is used to evaluate transverse distance measurement accuracy in this tissue-mimicking phantom image? A . Option AB . Option BC . Option CD . Option DView AnswerAnswer: D Explanation: In the tissue-mimicking phantom image, Option D (blue box) is used to evaluate transverse distance measurement accuracy. Phantoms...

Which change can be made in order to avoid exceeding the Nyquist limit?A . Increase output powerB . Decrease output powerC . Increase pulse repetition frequencyD . Decrease pulse repetition frequencyView AnswerAnswer: C Explanation: To avoid exceeding the Nyquist limit and prevent aliasing in Doppler ultrasound, the pulse repetition frequency...