ARDMS SPI Exam Dumps

Enhancement is an artifact that results from decreased attenuation. When an ultrasound wave travels through a medium with lower attenuation compared to surrounding tissues, it loses less energy. Consequently, the structures located deeper than the low-attenuation medium appear brighter on the ultrasound image. This artifact is commonly observed behind fluid-filled structures, such as cysts or the urinary bladder, where the sound waves encounter minimal resistance and thus less attenuation. Reference:

ARDMS Sonography Principles and Instrumentation guidelines

'Diagnostic Ultrasound: Principles and Instruments' by Frederick W. Kremkau

Temporal resolution refers to the ability of the ultrasound system to distinguish events occurring closely in time. In color flow imaging, temporal resolution is affected by the frame rate, which can be increased by decreasing the width of the color field of view. This is because a narrower color field requires fewer scan lines to be processed, allowing for more frames to be captured per second.

ARDMS Sonography Principles and Instrumentation guidelines

Edelman, S. K. (2017). Understanding Ultrasound Physics.

Damping in a pulsed-wave transducer primarily affects the pulse duration. Damping refers to the process of reducing the vibration of the transducer crystal after the initial excitation. When damping is applied, it shortens the length of the ultrasound pulse by quickly reducing the vibration. This results in a shorter pulse duration, which is important for improving axial resolution. Damping does not directly affect the pulse repetition frequency, beam focus, or beam penetration, although it can have indirect effects on image quality and resolution. Reference:

ARDMS Sonography Principles and Instrumentation guidelines

'Diagnostic Ultrasound: Principles and Instruments' by Frederick W. Kremkau

Comprehensive and Detailed Explanation From Exact Extract:

Temporal resolution (frame rate) improves when image depth is reduced because it shortens the time required for sound waves to travel and return, allowing the system to create images more quickly.

According to sonography instrumentation reference:

''Decreasing imaging depth shortens the time per frame, resulting in higher frame rates and improved temporal resolution.''

Therefore, the correct answer is D: Decrease display depth.

Comprehensive and Detailed Explanation From Exact Extract:

The matching layer is placed in front of the piezoelectric element and serves to reduce the difference in acoustic impedance between the transducer and human tissue, thereby improving sound transmission and minimizing reflection at the interface.

According to sonography instrumentation reference:

''The matching layer minimizes impedance mismatch between the transducer and soft tissue, allowing more efficient transmission of ultrasound energy into the patient.''

Therefore, the correct answer is D: Matching Layer.

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