Ultrasound Imaging Quality Factors

Which factor primarily determines the spatial resolution in ultrasound imaging?

What is the main effect of high frequency on ultrasound attenuation?

Which ultrasound frequency range is suitable for imaging large organs?

How does a non-perpendicular reflection influence the echo signal intensity?

What kind of surface causes high scattering in ultrasound imaging?

Which parameter decreases exponentially in both pressure and intensity during attenuation?

Why is lower frequency used for imaging deeper structures?

What is the main trade-off when choosing an ultrasound frequency?

What characterizes a good spatial resolution in terms of object distance?

Which factor is associated with poor image quality in ultrasound imaging?

Quality of Ultrasound Imaging

Determined by the interaction of the acoustic wave with body tissue
Interactions include spatial resolution, attenuation, and reflection and transmission

Spatial Resolution

Limited by the wavelength of sound
Shorter wavelength yields a better resolution
A smaller distance between two objects results in better resolution
Good image: Small Δs, good spatial resolution
Bad image: Large Δs, bad spatial resolution

Attenuation

Characterized by an exponential decrease in pressure and intensity of the ultrasound beam as a function of propagation distance, z, through tissue
High frequency leads to high attenuation and poor penetration
Low frequency leads to low attenuation and good penetration
Higher frequencies used for superficial structures, lower frequencies for deeper structures

Image Quality

Ultrasound frequency chosen based on a compromise between good resolution and deep penetration
Good resolution: Higher frequency, but no deep penetration
Deep penetration: Lower frequency, but bad resolution
Frequency ranges for different organs:
- Large organs: 3-5 MHz
- Small organs: 4-10 MHz

Reflection

Perpendicular reflection originates the echo signal, while non-perpendicular reflection causes an intensity loss in the echo signal
Smooth surface: Low scattering, good image
Rough surface: High scattering, bad image

This quiz assesses your understanding of the factors that affect the quality of ultrasound imaging, including spatial resolution, attenuation, and reflection and transmission. Learn how these interactions impact image resolution and quality.