Image Processor Flashcards
1
Q
5 main aspects of image processor
A
- pre-processor
- scan converter
- post processor
- digital to analog convert
2
Q
9 examples pre-processing
A
- write magnification/write zoom
- edge enhancement
- pixel interpolation
- persistence aka frame averaging aka SNR
- 3D imaging aka volume imaging/volumetric scanning
- panoramic imaging
- spatial compounding
- fusion imaging
- elastography
3
Q
what is persistence
A
averaging of sequential frames to provide smoother image appearance/ decrease noise
4
Q
what is scan conversion
A
scan line converted into frames
5
Q
how many scan lines in a frame
A
96-256
6
Q
post processing examples (3)
A
- black/white echo inversion
- b-colour
- read magnification/ read zoom
7
Q
each frame is made up of
A
“matrix” of tiny blocks (pixels)
8
Q
what info do the pixels contain
A
brightness (amplitude/intensity)
9
Q
how many shades of gray can 1 matrix show
A
2 (on/off)
10
Q
what is a 1-bit pixel called
A
bistable
11
Q
how to determine possible number of shades of gray
A
2^ # bits
12
Q
image memory contributes to
A
contrast resolution
13
Q
contrast resolution formula
A
CR = dB/shade
14
Q
bits per pixel
A
contrast resolution
15
Q
pixels per frame
A
detail/spatial resolution
