Chapter 14

Question 1

turns electric energy to acoustic

energy and vise versa

Answer 1

Transducer

Question 2

creates and controls
the electrical signals sent to the transducer that
generate sound pulses.

Answer 2

Pulser and beam former

Question 3

determines amplitude, PRP, and PRF

Answer 3

Pulser

Question 4

determines the firing delay

pattern

Answer 4

Beam former

Question 5

transforms the electrical signals from

the transducer into a form suitable for display

Answer 5

Receiver

Question 6

presents processed data

Answer 6

Display

Question 7

archives the ultrasound studies

Answer 7

Storage

Question 8

maintains and organizes
the proper timing and interaction of the systems
components

Answer 8

Master Synchronizer

Question 9

The _ creates electrical signals that
excite the transducer’s PZT crystals and
create sound beams.
Functions during _

Answer 9

pulser

transmission

Question 10

Directly controls the amount of power entering the

patient

Answer 10

Pulser

Question 11

The part of the beam former that determines:
PRF
PRP
Amplitude

Answer 11

Pulser

Question 12

Transducer Output ranges from

Answer 12

0-100 volts

Question 13

Changes in pulser voltage modify the

Answer 13

brightness of the entire image displayed

on the system’s screen.

Question 14

The sonographer can adjust the _ of the pulser’s electrical
voltage spike

Answer 14

magnitude

Question 15

When pulser voltage is low,
the element vibrates _ and a _ sound beam is
transmitted into the body. The
reflected echoes are _ and the image tends to be _

Answer 15

gently
weak
weak
dark

Question 16

When pulser voltage is high,

the element vibrates _ and _ sound beams are sent into the body. The reflected echoes are _ and the image is _.

Answer 16

more forcefully
stronger
stronger
brighter

Question 17

Pulser voltage AKA

Answer 17

Output gain
Acoustic power
Pulser power
Energy output
Transmitter output
Power
Gain- avoid using this

Question 18

Is pulser voltage adjustable by sonographer?

Answer 18

Yes

Question 19

Modifying transducer output changes

Answer 19

all the
pulses transmitted to the body.
The brightness of the entire image changes

Question 20

Lower pulser voltages _ the

likelihood of bioeffects

Answer 20

minimize

Question 21

Random and persistent disturbance that

obscures or reduces a signal’s clarity

Answer 21

Noise

Question 22

Noise contaminates images with _

Answer 22

low-level,

undesirable information

Question 23

_ is a comparison of the
meaningful information in an image (signal)
compared to the amount of contamination
(noise).

Answer 23

Signal to noise ratio

Question 24

When transducer output is low, noise is (more or less) likely to degrade the image

Answer 24

More

Question 25

An increase in output power =

Answer 25

increase in
signal-to-noise ratio
Better image

Question 26

Do noise levels remain constant to change?

Answer 26

Remain constant

Question 27

_ is the most common

way to improve the signal to noise ratio

Answer 27

Increasing output power

Question 28

Pulse Repetition Period is determined by

Answer 28

the pulser

Question 29

Is PRP adjustable by sonographer

Answer 29

Yes

Question 30

_ determines maximum imaging depth

Answer 30

PRP