Tomography
AKA narrow angle tomography
What is zonography?
DR
What is Direct Radiography?
How a grayscale bit depth of 14 is written
What is 214?
Can the xray system extrapolate data and produce an image if the exposure values fall outside of the normal range?
What is NO!
Matrix size and resolution have this relationship
What in direct relationship?
Matrix size increases, pixel size decreases, resolution increases
To obtain thinner tomography slices, do we increase or decrease the exposure angle?
What is increase?
This is a continuously varying quantity
What is analog?
how many shades of gray can a 218 bit depth system produce?
What is 262,144 shades of gray?
This changes the brightness and contrast of the image and is a point processing operation
What is windowing?
When we have more noise than signal , this indicates a __________SNR
What is Low?
AKA pivot point
What is the fulcrum?
This type of radiography is a 2 part process
What is indirect conversion?
Data that is stored to substitute new values for each pixel
What is LUT or Look Up Table?
The range of shades of gray that will be displayed is AKA
What is window width?
Noise and contrast have this relationship
What is inverse relationship?
more noise decreases contrast. If you call a name in a crowded waiting room, your voice will not be different enough to be heard (low contrast)
As Tomographic angle increases, section thickness gets (smaller/larger/no affect)
What is no affect?
The dimensions of the image matrix is also known as the _____________
What is field of view?
This corresponds to the shape of the histogram (2 things)
The quantity of information stored for each pixel varies depending on the ___________________ of the system
What is Grayscale or Bit Depth?
DQE is affected by 3 things; system noise, quantum noise, and ________________.
What is SNR?
Amplitude of tube travel, distance from the focal plane, distance from the IR, and orientation of travel all affect this....
What is blur?
If we increase the image matrix, what happens to spatial resolution?
What is increases?
Why? Larger Matrix=smaller pixels=higher resolution
Correcting an over or under exposure by shifting the histogram
What is rescaling?
Primary limiting factor of spatial resolution in digital imaging systems
What is pixel size?
The accuracy and sensitivity of an image receptor can be quantified using this measurement
What is DQE?