Processing
High gradient refers to a ________ contrast image.
High
What describes the available grayscale and the number of shades of gray that can be displayed within a pixel?
Bit Depth
The dynamic range of a digital imaging system is _________ than that of a film-screen system.
More (much greater)
The grayscale of digital imaging is mainly controlled by:
LUT (Look up table)
Edge enhancement, Electronic Calipers and ROI are all functions that can be used during:
Post Processing
Software that allows dense and lucent areas to be displayed well together:
Equalization
What is the range of exposure intensities that an IR can respond to and acquire image data?
Dynamic Range
Having a higher DQE indicates a potentially _______ patient dose.
Less (lower)
The role of mAs in digital imaging includes impacting the quantity of radiation to the IR and _________.
Increasing signal to avoid excessive noise
What is the complex mathematical equation used for data computation?
Algorithm
What is the process that takes a histogram and compares it with a preestablished histogram specific to that body part?
Histogram Analysis
Preservation of the SNR and potential "speed class" or radiation exposure level that is required to produce an optimal image
Detective Quantum Efficiency (DQE)
Scatter control has _____ importance with digital imaging as compared with film screen.
More
DI is the new standard replacing EI#. What does DI stand for?
Deviation Index
High SNR
High Bit depth
Post processing functions include which 3 things?
Allow changes in appearance to be made
Done via Software
Include W/W & W/L adjustments
This is evaluated by comparing the image noise of a detector with that on an "ideal" detector with the same signal-response characteristics and is a measure of how well the signal to noise ratio is preserved in the image.
DQE
Systems with high inherent electronic noise will need _________ signal to compensate
More - do this by increasing mAs
How many times can the 15% rule be applied and NOT impact the quality of the digital image?
Twice
Noise controlled by the tech is done with which 3 things?
Good Collimation
Grid use
Appropriate kV levels
Digital imaging pre processing includes what two pieces?
Rescaling & Histogram Analysis
The range of exposures that produce acceptable information to be used in image formation:
Exposure Latitude
A 14 bit system is purchased to replace a 12 bit system. This will case __________ grays to be displayed.
More
Digital has ______ spatial resolution and ______ contrast resolution when compared to film.
Less, More
One the image is processed, the signal is to the ______ to convert it to a digital electronic signal for the display computer.
Analog to Digital converter (ADC)