Ch. 2 Flashcards
recorded as multiple numeric values are divided into an array of small elements that can be processed in many different ways
digital imaging
refers to a device or system that captures or measures a continuously changing signal
analog
in [DR or CR] analog signals are converted into numbers that are recorded. These images are formed through multiple samplings of the signal rather than one single exposure
DR
two critical qualities of digital image
signal image
final displayed image
primary influences of signal images
Some rats sleep never, some get random sleep
Receptor exposure
subject contrast
noise
sharpness
geometric magnification
ratio of SID to SOD
shape distortion
primary influences of final image
Friends Bring Canned Noodles so Grandpa Doesn’t Starve
brightness
contrast / grayscale
noise
sharpness
geometric magnification
display magnification
shape distortion
kinetic energy release per unit mass of air
Air kerma
Quantity kerma is expressed as
J/Kg
or
Gy
Standard exposure typical of that imaging receptor system
Kstd
during kSTD, the exposure is made with _______ ________ that hardens the beam
additional filtration
The measurement of the radiation that was the incident exposure on the imaging plate for that particular exposure
kIND
What is derived from reading the pixel values produced by the exposure on an IR
kIND
What can be simply stated as amount of exposure on the IR
kIND
What helps determine whether the IR has been overexposed under exposed for that particular body part?
kIND
Set a value is established by either the system manufacturer, or the system user that represents an optical exposure for each specific body, part, and view
kTGT
