SPI

The calipers in this image measure which performance characteristic of a system? A . Depth measurement accuracyB . Dynamic rangeC . Axial resolutionD . Lateral resolutionView AnswerAnswer: A Explanation: The calipers shown in the image are used to measure the depth of structures within the ultrasound image. This performance characteristic,...

What is the primary purpose of backing material in transducers?A . Improving axial resolutionB . Increasing the number of cycles in a pulseC . Preventing electrical shock to the operator or patientD . Improving acoustic impedance matchingView AnswerAnswer: A Explanation: The backing material, also known as damping material, in an...

Which resolution is improved by focusing?A . LateralB . AxialC . TemporalD . ContrastView AnswerAnswer: A Explanation: Focusing improves lateral resolution in ultrasound imaging. Lateral resolution refers to the system's ability to distinguish between two points that are side by side (perpendicular to the sound beam's path). By focusing the...

During a color Doppler scan, which angle to flow would most likely result in no color being visualized?A . 3 degreesB . 45 degreesC . 88 degreesD . 175 degreesView AnswerAnswer: C Explanation: Color Doppler imaging is most effective when the angle between the ultrasound beam and the flow of...

In this image, which artifact is demonstrated? A . MirroringB . AliasingC . Range ambiguityD . Spectral broadeningView AnswerAnswer: A Explanation: The artifact demonstrated in the image is mirroring. This occurs when the ultrasound beam encounters a strong reflector, such as a diaphragm or pleura, and is reflected back and...

Which target group in this image of a tissue-mimicking phantom is used for gray-scale evaluation? A . Option AB . Option BC . Option CD . Option DView AnswerAnswer: C Explanation: Gray-scale evaluation in a tissue-mimicking phantom involves assessing the uniformity and accuracy of the gray-scale representation of the tissues....

Which color Doppler setting can be optimized to eliminate low-frequency Doppler shifts without having any effect on higher Doppler frequency shifts?A . GainB . ScaleC . Wall filterD . PersistenceView AnswerAnswer: C Explanation: The wall filter is used in color Doppler and spectral Doppler imaging to eliminate low-frequency Doppler shifts...

What is the function of M-mode?A . Create 3D imagesB . Visualize internal organsC . Monitor blood flowD . Measure movementView AnswerAnswer: D Explanation: M-mode (Motion mode) is used in ultrasound to measure and display the movement of structures over time. This mode is particularly useful in cardiac imaging to...

In this image obtained from a tissue-mimicking phantom, which area of the sector is used to evaluate the dead zone? A . Option AB . Option BC . Option CD . Option DView AnswerAnswer: A Explanation: The dead zone in ultrasound imaging refers to the region closest to the transducer...

Which statement describes the purpose of using a spectral Doppler wall filter?A . To widen the area in which the Doppler shift is sampledB . To clean up the audio signalsC . To eliminate the higher velocity signalsD . To eliminate the lower velocity signalsView AnswerAnswer: D Explanation: The purpose...