ARDMS SPI Exam Verified A+
What is the role of pulse duration in ultrasound imaging?
️️Pulse duration determines the amount of time an ultrasound pulse lasts, affecting axial
resolution and overall image clarity.
How does the wavelength impact image resolution in sonography?
️️A s...
What determines the depth of penetration in ultrasound?
✔️✔️Depth of penetration is primarily determined by the frequency of the ultrasound wave; lower
frequencies penetrate deeper.
Explain how duty factor relates to pulse wave ultrasound.
✔️✔️Duty factor is the percentage of time an ultrasound system actively transmits sound waves; in
pulse wave ultrasound, it’s always less than 1.
What effect does increasing frequency have on spatial resolution?
✔️✔️Increasing frequency enhances spatial resolution, improving the image’s fine detail.
Describe the purpose of the transducer crystal.
✔️✔️The transducer crystal converts electrical energy into sound waves and then back into electrical
energy for image formation.
How does beam width affect lateral resolution?
✔️✔️Narrower beam width improves lateral resolution, providing better distinction between
structures that are side by side.
What is the function of Time Gain Compensation (TGC)?
, ✔️✔️TGC adjusts the amplification of returning echoes at varying depths, equalizing image brightness
across all depths.
Explain the term “attenuation” in ultrasound.
✔️✔️Attenuation refers to the gradual loss of ultrasound signal strength as it travels through tissue,
mainly due to absorption, reflection, and scattering.
How does high-frequency transducer selection impact imaging of deep structures?
✔️✔️High-frequency transducers provide better resolution but have limited penetration, making
them less suitable for deep structures.
What is axial resolution, and how is it determined?
✔️✔️Axial resolution is the ability to distinguish two structures along the path of the sound beam and
is determined by spatial pulse length.
Why is a gel used in ultrasound imaging?
✔️✔️Gel eliminates air between the transducer and skin, facilitating the transmission of ultrasound
waves.
How does Doppler shift occur in ultrasound?
✔️✔️A Doppler shift occurs when there is a change in frequency due to the movement of a structure,
such as blood flow relative to the transducer.
Describe the relationship between power and intensity in ultrasound.
✔️✔️Intensity is the power per unit area; increasing power or focusing the beam raises intensity.
What happens to the frame rate when depth increases?
✔️✔️Frame rate decreases with increased depth as the ultrasound system needs more time for sound
waves to travel and return from deeper structures.
How do harmonics improve image quality?
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