image processor Flashcards
1
Q
image processor includes?
A
- preprocessor
- scan converter
- image memory
- postprocessor
- digital-to-analog converter
2
Q
scan line info is?
A
- built into frames of information
- pre-processed
3
Q
scan conversion?
A
- done by scan conveter
- building a frame
- properly located each echo on image frame
- real time
- echo info (scan lines) to image form (frames)
4
Q
scan convertion how many scan lines in a frame?
A
96-256 scan lines in a frame
5
Q
Each frame is made up of a ‘matrix’ of tiny blocks called?
A
pixels
6
Q
typically pixels in a matrix?
A
- 1024 x 768
- 512 x 384
7
Q
3D =
A
voxels
8
Q
pre-processing?
A
- before freeze
- done while echo data is being stored in memory
- the frame is still being built during this time
9
Q
post-processing?
A
- freeze
- done on image retrieved from image memory
10
Q
prepocession characteristics? (6)
A
- before the data is stored in memory
- persistence
- panoramic
- 3D
- spatial compounding
- write magnification
11
Q
post processing characteristics? (6)
A
- after data is stored in image memory
- b colour
- freeze frame
- black/white image invention
- read magnification
- contrast variation
12
Q
what is edge enhancement?
A
- pre-processing
- sharpens boundaries to make them more detectable and make measurements more precise
13
Q
pixel interpolation aka?
A
- fill-in interpolation
- filling in missed pixels
14
Q
what is spacial compounding?
A
- hit the same object from different angles and average the images
- trying to hit structures at 90 degrees
15
Q
persistance?
A
- aks frame averaging
- averaging of sequential frames
- reduces noise
16
Q
persistance affects?
A
- better contrast resolution
- operator controlled
- decreased FR
17
Q
what is 4D imaging?
A
= 3D + time
