Sciences Unit 3 SG Flashcards
What is relationship between matrix size and resolution and cost
^matrix size=^resolution=^cost
Define matrix
Layout of columns and rows
Define pixel
Picture element
Define DEL
Detector element
same as pixel but only on DR plate
1.What is the result to digital images when there is underexposure
2. What does this look like
3. What does the computer think and do
and how do exposure indicators relate to underexposure
Grainy/sandy/noise
“I’ll make it up”
low numbers for Mercy
High numbers for St. L
1.What is the result to digital images when there is overexposure
2. What does this look like
3. What does the computer think and do
and how do exposure indicators relate to Overexposure
black/burned out/flat and grey
I’ll make it up
High numbers Mercy/Low Stl
Advantages/Disadvantages between CR and DR
CR-minimal time savings over F/S
-minimal change in throughput
DR -Increased department throughput
-Increased res
-Higher initial costDefine algorithms and explain what it does for us
Math formula used by computer to manipulate data and process images
It controls density and contrast
What factors impact resolution that are unique to digital imaging
Large matrix size increase resolution
Increase # small pictures=increase in res
Decrease IR size=Increase in res
true for IR and monitor
What do we call the digital imaging function that fixes minor technique errors
Automatic rescaling
Our fixing of images takes away from dr use
What controls the number of photons produced
mAs SSSSSSSS
kVp determins what about the beam?
Whats the relationship to scatter production?
Penetrability
Increase in kVp=Decrease in scatter
Define brightness
How dark/light and image is
Define edge enhancement
increases appearance of sharpness
Define DICOM
Allows all vendors equipment to talk to PACS
