Digital Imaging and Image Manipulation Flashcards
Do film or PSP have less radiation doses?
PSP
Do PSP or CCD have less radiation doses?
CCD
Mathematical manipulation of image data
image processing
–affects image file size in memory storage
- useful for storage issues eg. “zipping” files
- actual file size is larger that stored file size
- compression is an algorithm that can shrink the file size for storage and recreate the data when retrieving the data
Compression
The number of colors that a pixel is able to show
Bit depth
What are the 3 ways file memory size can become large?
Size of grid (Sensor size)
Number of images
Bit depth
➢Edge Enhancement –sharpening filter ➢Noise Reduction –softening filter ➢Optimization of density/contrast ➢Inversion of gray scale ➢Magnification ➢Emboss function ➢Pseudocolor enhancement
Imaging Manipulation
To be able ______ an image, the computer will change density values to predetermined numbers which then changes the image’s presentation i.e., lighter darker, etc.
Are post post-display mathematical algorithms that manipulate the digital signal
Manipulate
Post-display mathematical algorithms that manipulate the digital signal
Imaging manipulations
Do imaging manipulations increase diagnostic accuracy?
No
Remove low-frequency noise; increases image contrast Exaggerate the contrast difference between adjacent pixels; to increase contrast, all pixel values are stretched; the dark shades become darker and the light shades become lighter
Enhances local contrast and makes edges sharper to diagnose caries, restoration fit, and fractures
simulates disease;
-Diagnostically dangerous
Sharpening filter - Edge Enhancement
Enlarge a specific area till the biggest detail
-Blurs edges
Magnification
Applies a three dimensional effect to the imageCould be useful in presentation situations
Emboss
- Length (in MiPACS viewer)
- Angles
- Bone Density
- Area
- Circumference
Automated image analysis
Data is utilized by other software programs and produces different image presentations
Image reconstruction