Ch. 13 Real-Time Imaging

Question 1

_____________________ is how many frames a system can display per second

Answer 1

Frame rate is how many frames a system can display per second

Question 2

What are the 2 factors that affect frame rate?

Answer 2

1. Speed of sound in the medium
2. imaging depth

Question 3

_______________________ resolution is the ability to display moving structure accurately in time, and is determined by frame rate.

Answer 3

Temporal Resolution is the ability to display moving structure accurately in time, and is determined by frame rate.

Question 4

Temporal Resolution =

Answer 4

Temporal Resolution = FR (Frame Rate)

Question 5

When an ultrasound system creates an image in 1/10 of a second, the frame rate is?

Answer 5

10 frames per second or 10 Hertz

Question 6

When a system creates an image in 1/50th of a second, the frame rate is?

Answer 6

50 frames per second or 50 Hertz

Question 7

Two sonographer-controlled settings of an ultrasound system determine frame rate:

Answer 7

1. imaging depth
2. number of pulses in each picture

Question 8

____________________ Resolution is the overall detail in an image. It includes both axial and lateral resolution. Often, to achieve optimal image detail there is a tradeoff with temporal resolution

Answer 8

Spatial Resolution is the overall detail in an image. It includes both axial and lateral resolution. Often, to achieve optimal image detail there is a tradeoff with temporal resolution

Question 9

Frame Rate formula =

Answer 9

1
___________
Frame Time (second)
- sector width
- lines per frame
- depth
- box size
- focal zones