Display Modes Chapter 11

These flashcards cover key concepts and details about the different display modes used in ultrasonography, including A Mode, B Mode, and M Mode.

What does the A Mode in ultrasonography measure?

A Mode measures the depth of reflectors and accurately measures structure thickness.

How is the strength of the reflection represented in B Mode?

The strength of the reflection in B Mode is represented by the brightness of the dot, where weak reflections appear as dark gray dots and stronger reflections appear as brighter white dots.

What is the relationship between the height of the upward deflection in A Mode and the echo?

The height of upward deflection is proportional to the amplitude of the returning echo.

In M Mode, what does a straight horizontal line indicate?

A straight horizontal line in M Mode indicates a stationary reflector.

How does M Mode depict the motion of reflectors?

M Mode depicts the motion of reflectors through a line that moves up and down, indicating reflectors moving closer or farther away.

What unique feature does M Mode provide regarding reflectors?

M Mode provides information about a reflector's changing location with respect to time.

What information is displayed on the X axis of B Mode?

The X axis of B Mode displays depth information related to the sound pulse.

What is B-mode?

B-Mode displays echoes as dots of varying brightness which corresponds to echo amplitude, forming a two- dimensional grayscale image.

What determines the brightness of a pixel in B-mode imaging?

Echo amplitude; stronger echoes produce brighter pixels.

What display mode provides the highest temporal resolution>

M-Mode

In imaging a-mode what are the x/y/z axis?

A-mode

X= depth

Y= amplitude

Z= none

In b-mode what are the x/y/z axis?

B-mode

X= depth

Y=none

Z= amplitude

In m-mode what is x/y/z axis?

M-mode

X= time

Y= depth

Z= none

What factor will most significantly decrease frame rate?

Increasing the number of focal zones

Real- time imaging is achieved by

Displaying multiple frames per second

What Doppler display mode shows blood flow velocity over time?

Spectral Doppler

What Doppler mode is most sensitive to low- velocity blood flow>

Power Doppler

A limitation of power Doppler is that it

Does not display flow direction.

Increasing persistence will have what effect on the image?

Decreased noise and decreased temporal resolution

Spatial compounding improves image quality by

Reducing speckle and improving contrast resolution

What is the primary trade-off when using spatial compounding?

Reduced frame rate

Increasing line density will result in

Improved lateral resolution

Which display mode is best for evaluating cardiac valve motion?

M-mode

Color Doppler primarily provides information about

Flow direction and relative velocity

Which display mode is most angle-independent?

Power Doppler

Which action would improve temporal resolution?

Narrowing the sector width

A sonographer wants to visualize slow blood flow in a small vessel. Which mode is most appropriate?

Power Doppler

Which display mode converts returning echoes into a 2D grayscale image?

B-mode