Module 6

What is the only display mode that provides information regarding reflector motion with respect to time?

M-mode

With A-mode, what is displayed on the x-axis?

depth of the reflector

With M-mode, what is displayed on the y-axis?

depth of the reflector

Which mode provides the foundation for real-time, gray scale anatomic imaging?

B-mode, or brightness mode

With A-mode, what is displayed on the y-axis?

amplitude of the reflected signal

In M-mode, what is displayed on the x-axis?

time

With B-mode, which axis is related to the strength of the reflection?

the z-axis

T or F. Mechanical scanning produces pictures that are similar in shape to linear phased array images.

true

• Sector-shaped

T or F. Many active elements fire at almost the same time in a mechanical scanner.

False

• 1 active element in a mechanical scanner

T or F. Many active elements fire at almost the same time in a phased array scanner.

true

Which of the following is best described as mechanically steered and fixed, single focused?

• annular phased array

• Annular array

• Mechanical

• Linear phased

mechanical

Which of the following is best described as mechanically steered and multi-focus?

• annular phased array 

• Annular sequential array

• Mechanical

• Linear phased

annular phased array

Which of the following creates a rectangular shaped image?

• annular phased array

• Linear sequential array

• Mechanical

• Linear phased

linear sequential array

A linear phased array transducer has 128 crystals. How many of these crystals are fired to create a single sound beam?

• 1

• A small group 

• A large group

• 128

128

A linear sequential array transducer has 128 crystals. How many of these crystals are fired to create a single sound beam?

• 1

• A small group

• A large group

• 128

a small group

In a linear phased array, what is the firing pattern that steers a beam to the left or right?

electronic slope

In linear phased arrays, what is the firing pattern that focuses a sound beam?

electronic curvature

T or F. There are large time delays in the firing pattern of a linear phased array transducer.

false

• tiny time delays

T or F. A machine that displays A-mode and 2-D images is called a duplex scanner.

False

• duplex scanners display Doppler and 2-D images

Which of the following improves elevational resolution?

• matrix array

• Linear phased arrays

• One and one-half dimensional array

• 2-D array

one and one-half dimensional array

T or F. Side lobes degrade axial resolution.

false

T or F. Side lobes degrade lateral resolution.

true