Chapter 12 Flashcards
T or F. Mechanical scanning produces pictures that are similar in shape to linear phased array images.
True
T or F. Many active elements fire at almost the same time in mechanical scanner.
False
T or F. Many active elements fire at almost the same time in a phased array scanner.
True
Which of the following transducers is best described as mechanically steered and fixed, single focused? Annular phased array Annular array Mechanical Linear phased
Mechanical
Which of the following transducers is best described as mechanically steered and multi focused? Annular phased array transducer Annular array transducer Mechanical transducer Linear phased transducer
Annular phased array transducer
Which of the following transducers 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?
128
A linear phased sequential array transducer has 128 crystals. How many of these crystals are fired to create a single sound beam?
A small group
In a linear phased array, what is the firing pattern that steers a beam to the left or right?
The firing pattern that steers a beam to the left or right is electronic slope.
In linear phased arrays, what is the firing pattern that focuses a sound beam?
The firing pattern that focuses a sound beam in electronic curvature
T or F. There are large time delays in the firing pattern of a linear phased array transducer.
False
T or F. A machine that displays A-mode and two-dimensional images is called a duplex scanner.
Fasle
Which of the following improves elevation resolution? Matrix array Linear phased array One and one-half dimensional array Two-dimensional 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
