Chapter 4: RAD EXPO. Flashcards
With_imaging, automatic_provides images that have similar brightness (density) over an exposure range_than_?
digital, rescaling, greater, 50X
What is likely to occur if there is substantial extraneous exposure?
histogram analysis error
When the photon intensity reaching the receptor is lower than that required to produce an optimal image.
underexposure
Causes the system to rescale the image as if the plate is actually underexposed?
low-intensity exposure
of causes grid cutoff & decreased contrast
flattening of luminance
Processing algorithm has more of an effect on image_ than_?
contrast, kVp
Be caused of_sensitivity to scatter radiation, the kVp should not exceed_ for any nongrid radiography, including_?
Increased, 80, chest
Acquiring one image on the_plate available avoids_error
smallest, recognition
Collimation limits_?
irradiated volume and reduces undercutting
occurs when a large number of pixels will be at the_digital value() so that there is no_difference in the very high_areas, resulting in loss of anatomical structures in that region.
Saturation,maximum ,(black),signal, exposure
Receptor’s contribution to recorded detail?
Spatial resolution
PSP plates are more_to fogging than conventional film-screen systems?
susceptible
What would substantial(_) overexposure of a body part enervate in proportion to the overexposure?
> 2x, additional scatter
Expressed as pixels/mm, or pixel density?
sampling
In order to visualize the anatomical structures of interest, some initial_ must occur during imaging data extraction.
preprocessing
Overexposure is when the_ intensity reaching the receptor is_ than the required to produce an_image
photon, higher, optimal
If exposure is>100% above the optimal signal level, the ALARA principle is_, and the extra scatter generated will degrade the_?
violated, contrast
When the exposure field is not recognized, the off-focus radiation and scatter outside the exposure field become part of the_?
histogram
Currently, each major vendor uses a unique_ indicator whose values indicates the exposure delivered to the plate.
exposure
With CR,cutoff does not result in a light image, due to the automatic of the image.
grid
Since the image contrast is generally determined through the processing_, the_ does not have the impact on final image contrast as with screen/film systems.
algorithm, kVp
The_alignment is_centered to the plate with four collimation margins parallel to the cassette edges.
optimal, feild
Because of their wide dynamic range, PSP plates are much more susceptible to_ than are film-screen systems.
fogging
The factors that determine that determine recorded detail:
motion
geometric
spatial resolution of receptor unit (line pair/mm)
