# Ultrsound Physics (Chapter 4)

28 Questions | Total Attempts: 1143  Settings  When someone is talking about ultrasound, they are referring to sound waves that have frequencies higher than the upper audible limit of human hearing. What can you tell us about the physics behind the concept of ultrasound? Let’s find out.

• 1.
What is the unit of pulse duration?
• A.

Watts

• B.

Meters

• C.

Seconds

• D.

Hertz

• E.

Joules

• 2.
• A.

Yes

• B.

No

• 3.
The actula time  from the start of a pulse to the end of that pulse.
• A.

Pulse Duration

• B.

Pulse Repetition Period

• C.

Pulse Repetition Frequency

• D.

Spatial Pulse Length

• E.

Duty Factor

• 4.
What is the typical value of pulse duration?
• A.

0.1-1 microseconds

• B.

.03 to 2 microseconds

• C.

.03 to 2 seconds

• D.

3 to 20 microseconds

• 5.
What is the unit for spatial pulse length?
• A.

Seconds

• B.

Meters

• C.

Hertz

• D.

Watts

• E.

Joules

• 6.
What is the typical value for spatial pulse length?
• A.

0.1-1mm

• B.

0.1-1cm

• C.

0.1-1m

• D.

1-10 mm

• 7.
Pulse Duration is determined by:
• A.

Sound Source

• B.

Medium

• C.

Both

• 8.
Spatial pulse length is determined by
• A.

Sound source

• B.

Medium

• C.

Both

• 9.
• A.

Yes

• B.

No

• 10.
What is the units for pulse repetition frequency
• A.

Seconds

• B.

Meters

• C.

Hertz

• D.

Watts

• E.

Joule

• 11.
The distance that a pulse occupies om space from the start to the end of a pulse
• A.

Pulse Duration

• B.

Pulse Repetition Period

• C.

Pulse Repetition Frequency

• D.

Duty Factor

• E.

Spatial Pulse Length

• 12.
The time from the start of one pulse to the start of the next pulse
• A.

Pulse Duration

• B.

Pulse Repetition Period

• C.

Pulse Reptition Frequency

• D.

Pulse Duration

• E.

Duty Factor

• 13.
What is the typical value for pulse repetition frequency?
• A.

1,000 to 10,000 Hz

• B.

100 to 1,000 Hz

• C.

10,000 to 100,000 Hz

• D.

1-10 Hz

• 14.
What is the unit for pulse repetition period?
• A.

Meters

• B.

Seconds

• C.

Hertz

• D.

Watts

• E.

Joules

• 15.
Is the pulse repetition period adjustable
• A.

Yes

• B.

No

• 16.
How is pulse repetition period adjusted?
• A.

Gain

• B.

Frequency

• C.

Dept

• D.

Acoustic Power

• 17.
The number of pulses that an ultrasound system transmits into the body each second
• A.

Pulse duration

• B.

Pulse Repetition Period

• C.

Duty Factor

• D.

Pulse Repetition Frequency

• 18.
What is the typical value of pulse repetition period?
• A.

1 second to 10 seconds

• B.

1 microseconds to 10 milliseconds

• C.

10 microseconds to 1 milliseconds

• D.

100 microseconds to 1 milliseconds

• 19.
What is the off time
• A.

A

• B.

B

• C.

C

• D.

D

• E.

E

• 20.
What is the typical pulse
• A.

1-10 cycles

• B.

10-20 cycles

• C.

2-4 cycles

• D.

20-40 cycles

• 21.
Pulse repetition period is determined by:
• A.

Sound source

• B.

Medium

• C.

Both

• 22.
What is the pulse repetition frequency determined by
• A.

Sound source

• B.

Medium

• C.

Both

• 23.
Whats is the spatial pulse length
• A.

A

• B.

B

• C.

C

• D.

D

• E.

E

• 24.
How is pulse repetition frequency adjusted?
• A.

Power Acoustic

• B.

Depth

• C.

Gain

• D.

Focus

• 25.
The percentage or fraction of time that the system is transmitting a pulse
• A.

Spatial Pulse Length

• B.

Pulse Duration

• C.

Pulse Repetition Period

• D.

Pulse Repetition Frequency

• E.

Duty Factor

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