Contrast, Spatial, And Temporel Resolution

Question 0

Visualizing detail in an image

Answer 0

Spatial resolution

Question 1

Visualizing a variety of gray shades in an image

Answer 1

Contrast resolution

Question 2

Few gray shades in an image is indicative of what?

Answer 2

Poor contrast resolution

Question 3

Limited detail in an image is indicative of what?

Answer 3

Poor spatial resolution

Question 4

The production of a motion picture

Answer 4

Real-time imaging

Question 5

The ability to accurately locate moving structures at any particular instant in time

Answer 5

Temporal resolution

Question 6

What is temporal resolution determined by?

Answer 6

Temporal resolution depends upon frame rate. More images per second improves Temporal resolution.

Question 7

What two factors specifically determine frame rate?

Answer 7

Imaging depth, and or number of pulses per image

Question 8

Frame rate is limited by what two factors?

Answer 8

The speed of sound in medium, and or the depth of view

Question 9

What is a fundamental limitation of Temporal resolution?

Answer 9

The speed of sound in a medium

Question 10

What are four factors under sonographer control that affect temporal resolution?

Answer 10

Maximum imaging depth, number of pulses per scanline, sector size, line density

Question 11

With regard to maximum imaging depth what will create a frame in less time?

Answer 11

Shallow depth of view makes a frame faster, and improves Temporal resolution.

Question 12

If imaging depth of view is doubled, what will happen to the frame rate?

Answer 12

The frame rate will be halved.

Question 13

With regard to pulses per scanline, what will create a frame with fewer pulses?

Answer 13

Single focus systems use fewer pulses, and have better Temporal resolution.

Question 14

With regard to single versus multi focus systems, what is the trade-off in relation to image versus movie quality?

Answer 14

Improving image quality often degrades Temporel resolution because it lowers the frame rate. Multi-focus generally improves lateral resolution but reduces frame rate and temporal resolution. This degrades Temporal resolution.

Question 15

With regard to sector size, what will create a frame with fewer pulses?

Answer 15

Smaller sector angle creates images with fewer pulses, improving Temporal resolution.

Question 16

With regard to line density, what will create a frame with fewer pulses?

Answer 16

Low line density images use fewer pulses, and have better Temporal resolution. However, lower line density degrades spatial resolution.

Question 17

How are frame rate and time to create a frame related?

Answer 17

Tf x FR = 1
They are reciprocals.
When one frame is created in 1/10 of a second, then the frame rate will be 10/sec or 10 Hz.