Pulsed ultrasound and imaging

Question 1

The range of frequencies found within a pulse is the

Answer 1

Bandwidth

Question 2

Frame rate is influenced by all of the following except:
- Depth of imaging
- Presence of multiple focal zones
- Depth of focus
- Width of the ROI

Answer 2

• Depth of focus

Question 3

The range equation describes the relationship between which two variables?

Answer 3

Reflector distance and echo transit time

Question 4

What is the assumed speed of sound built in to the US machine?

Answer 4

1540 ms-1

Question 5

The pulse repetition period is the inverse of the

Answer 5

Pulse repetition frequency

Question 6

The pulse repetition frequency is the number of acoustic __________
transmitted by the ultrasound machine per ________

Answer 6

Pulses, second

Question 7

Factors that influence the propagation speed of a sound wave include….

Answer 7

The type of medium, the density of the medium and the temperature of the medium.

Question 8

M mode displays what information?

Answer 8

• movement pattern of reflectors
• reflector distance from transmitter
• echo amplitude
• distance between reflectors

It does not show - cross sectional structural information.

Question 9

The M-mode trace displays reflector
_________ on the y-axis versus _______
on the x-axis.

Answer 9

distance, time.

Question 10

When two or more ultrasound waves exist in the same medium at the same time how will they interfere?

Answer 10

Constructively, if they are travelling in phase in the same direction.