Fundamental Properties Flashcards
what is quality of a digital image affected by
matrix size, unsharpness in underlying image, bit depth, and noise in underlying image
what is the array of all the pixels into which an image is divided
image matrix
if image matrix is small - resolution is
low
image blur dominates when
pixel size is much smaller than unsharpness of underlying image
density in a pixel is represented by a what
binary number w a variable number of bits (bit depth)
the more noise present in the initial image, the fewer what
the bits that are needed to convey its representation
what is the total number of pixels multiplied by the pixel size
field of view
what does an analog-to-digital converter transform
the original continuous density into a set of discrete gray levels
what is the process called of the analog to digital converter trasform
digitization
what does image noise limit
contrast resolution
during what is bit depth important
during process of quantization
imaging receiver is what
electrical signals
how are electrical signals converted into digital image
analog-to-digital converter
how are electrical signals eventually displayed as
pixel
quantization is what
takes electrical signals and converts them to digital image
a larger bit depth = what
brightness level
a higher brightness level = what
contrast resolution
what is contrast resolution
smallest exposure change that can be detected and displayed by imaging system
large bit depth = ___ contrast resolution
high
if small bit depth, what happens with anatomical structures
start to blend together (NOT GOOD)
bit depth = what
total number of possible brightness level
what is process of those brightness levels
quantization
more bit depth, you are able to have more what
information
information collected by imaging system is just what
electrical signals
