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How does harmonic imaging improve image quality?
️️Harmonic imaging reduces artifacts by using higher harmonic frequencies, which produce
clearer, more detailed images than fundamental frequencies.
What is the primary cause of side lobe artifact...
✔️✔️Harmonic imaging reduces artifacts by using higher harmonic frequencies, which produce
clearer, more detailed images than fundamental frequencies.
What is the primary cause of side lobe artifacts?
✔️✔️Side lobe artifacts result from unwanted sound beams emitted at angles outside the main beam,
potentially causing misleading echoes on the image.
How does adjusting dynamic range affect the contrast of an ultrasound image?
✔️✔️A lower dynamic range increases image contrast, making tissue boundaries more distinct but
potentially reducing detail in subtle areas.
Why is it important to minimize compression when imaging structures with high contrast?
✔️✔️Minimizing compression preserves differences in echo intensities, which helps in distinguishing
structures with varying densities.
What effect does a higher frequency transducer have on axial and lateral resolution?
✔️✔️Higher frequency transducers improve both axial and lateral resolution, providing more detailed
images but with reduced tissue penetration.
Describe the purpose of the Doppler wall filter.
✔️✔️The Doppler wall filter removes low-frequency signals caused by tissue movement, allowing for
clearer visualization of blood flow.
How does reverberation artifact appear on an ultrasound image?
✔️✔️Reverberation appears as multiple, evenly spaced echo lines, typically seen when sound waves
repeatedly reflect between two strong interfaces.
,Explain how frequency and wavelength relate to ultrasound penetration.
✔️✔️Lower frequencies, with longer wavelengths, penetrate deeper tissues, while higher frequencies,
with shorter wavelengths, offer better resolution but less penetration.
What does frame rate depend on in ultrasound imaging?
✔️✔️Frame rate depends on factors like depth, line density, and the number of focal zones, with
higher rates providing better temporal resolution.
How does increasing the number of focal zones affect imaging depth?
✔️✔️Increasing focal zones can enhance resolution at multiple depths but reduces frame rate,
impacting temporal resolution.
What causes comet tail artifacts, and how do they appear?
✔️✔️Comet tail artifacts result from sound waves reverberating within a small structure, creating a
series of closely spaced bright echoes.
What is the purpose of the color box in Doppler imaging?
✔️✔️The color box designates the area where Doppler flow information is collected, enabling
visualization of blood flow within that specific region.
Explain the concept of time gain compensation (TGC).
✔️✔️TGC selectively adjusts gain at different depths to compensate for attenuation, providing a
uniformly bright image across all tissue depths.
How does elevational resolution impact the accuracy of ultrasound images?
✔️✔️Elevational resolution affects the image's slice thickness, influencing the accuracy of structure
representation in the out-of-plane dimension.
What is the purpose of using a curvilinear transducer in abdominal imaging?
✔️✔️Curvilinear transducers provide a wide field of view and are ideal for imaging larger, deeper
structures within the abdomen.
, Describe the function of the beamformer in ultrasound equipment.
✔️✔️The beamformer controls the timing and direction of the ultrasound pulses, optimizing beam
focus and contributing to image quality.
How does compression affect the appearance of the ultrasound image?
✔️✔️Compression adjusts the range of echo intensities, balancing contrast to differentiate tissues
while preventing high-intensity signals from being too bright.
What causes the attenuation of sound waves in tissue?
✔️✔️Attenuation occurs due to absorption, scattering, and reflection of sound waves, which reduces
wave strength as they travel through tissue.
Explain the significance of the acoustic impedance in ultrasound imaging.
✔️✔️Acoustic impedance differences between tissues determine the amount of sound reflection,
impacting image contrast and boundary visibility.
What is the purpose of a standoff pad in superficial imaging?
✔️✔️A standoff pad allows clearer imaging of superficial structures by providing optimal sound wave
focus at the shallow depth.
How does the Fresnel (near) field differ from the Fraunhofer (far) field?
✔️✔️The Fresnel field has a more focused beam with less divergence, providing better resolution,
while the Fraunhofer field diverges, reducing resolution.
What is the significance of the spatial pulse length in axial resolution?
✔️✔️A shorter spatial pulse length improves axial resolution by allowing better separation of closely
spaced structures along the beam path.
Why is Doppler angle important in measuring blood flow velocity?
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