Lecture 6

Question 1

5 parts of image processor

Answer 1

Preprocessor 
Scan converter 
Image memory 
Postprocessor 
Digital to analog converter

Question 2

Scan line information is built into _____ of info

Answer 2

Frames

Question 3

The scan line info being changed into frames is called

Answer 3

Pre-processed

Question 4

Where are frames stored

Answer 4

Image memory

Question 5

Frames are pulled out of memory and

Answer 5

Post processed

Question 6

Where is the frames sent after post processing

Answer 6

Sent to display as an analog signal

Question 7

What does the scan conversion

Answer 7

Scan converter

Question 8

What is scan conversion

Answer 8

Building a frame

Question 9

What happens during scan conversion

Answer 9

Digital echo information of scan line changed to digital image form of frames

Question 10

Scan conversion is responsible for

Answer 10

Properly locating each echo on the image frame

Question 11

Scan conversion happens in

Answer 11

Real time

96-256 scan lines in a frame

Question 12

Each frame is made up of a matrix of tiny blocks called

Answer 12

Pixel

Question 13

___pixels = better resolution

Answer 13

More

Question 14

Pixels in 3 D are called

Answer 14

Voxels

Question 15

Frames require _______

Answer 15

Processing

Question 16

When is pre processing done

Answer 16

Done while echo data is being stored in the memory

The frame is still being built during this time

Question 17

When is post processing done

Answer 17

Done on image retrieved from image memory

Question 18

Other functions of preprocessing (5)

Answer 18

Persistence, panoramic, 3D and 4D, spatial compounding, Write magnification

Question 19

Functions of post processing (5)

Answer 19

B colour
Freeze frame 
Black/ white image inversion 
Read magnification 
Contrast variation

Question 20

What is edge enhancement of preprocessing

Answer 20

Sharpens boundaries to make them more detectable and make measurements more precise

Question 21

What is pixel interpolation in the pre-processing ?

Answer 21

Filling in missed pixels

aka fill-in interpolation

Question 22

Where are pixels missing

Answer 22

At the deeper portions of the echoes where the rays spread out more on curved probe

Question 23

How is pixel interpolation done

Answer 23

Average the brightness of the adjacent pixels and fill in the missing pixel accordingly

Question 24

What is panoramic imaging in the pre processing

Answer 24

Compilation of frames as transducer is moved

Results in an image with a wider field of view

Question 25

What is panaramic imaging limited by

Answer 25

Sonographer skill