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RADT456 Image Acquis

ARRT review Image Acquistion and Evaluation

QuestionAnswer
What does recorded detail refer to? The sharpness and abruptness of structural detail borders.
What does distortion relate to? It relates to the size and shape of the imaged part compared with the actual size and shape of the anatomic object.
How are recorded detail and magnification related? They are inversely related meaning that recorded detail increases as magnification decreases.
SID is inversely related to magnification and directly related to recorded detail. If SID increases then magnification decreases and if SID increases then recorded detail also increases
OID is directly related to magnification and inversely related to recorded detail. If OID increases then magnification increases and if OID increases then recorded detail decreases.
What happens to structures that do not run parallel to the x-ray tube and IR and/or lie outside of the central axis of the x-ray beam? They will be foreshortened or elongated
Focal spot size affects the detail by influencing the degree of blur or unsharpness. If the focal spot size increases then the blur will increase and the detail will decrease.
The use of a small focal spot improves recorded detail but generates _________________ More heat at the anode
Smaller anode angels can permit larger AFS sizes while maintaining small EFS sizes at the expense of Accentuating the anode heel effect.
What is the greatest adversary of recoded detail? Motion
What is involuntary patient motion best minimized by? Using the shortest possible exposure time
What can equipment motions result in? It can result in loss of recorded detail in the form of image blur.
What are the rare earth phosphors? Gadolinium, Lanthanum, and Yttrium
Recorded detail increases as: Focal spot size decreases, SID increases, OID (magnification) decreases, motion decreases, (shape) distortion decreases, and screen speed decreases
Intensifying screen phosphors absorb x-ray photons and emit a Large quantity of fluorescent light
Quantum mottle is more likely to occur when using fast screens with Low-mAs and high-kV factors
Perfect screen-film contact is required to maintain Recorded detail
Any combination of mA and exposure time that will produce a particular mAs, will produce identical image density. Reciprocity Law
mAs is the product of mA and exposure time in seconds
A term that describes density in electronic imaging is: Brightness
Doubling the mAs will double the radiographic density however halving the mAs will Reduce the density to half
What can relatively small changes in SID have a significant effect on? Image density/brightness
If an increase in kV will result in an increase in image density then a decrease in kV will result in: A decrease in image density
X-ray photons can: Penetrate though the part, scatter within the part, and be absorbed by the part
What do intensifying screens amplify the action of x-rays through? Their property of fluorescence
What are the different ways that grids can be used? They can be parallel, focused, moving, or stationary
The amount of scattered radiation reaching the IR is decreased through the combined use of: Collimators and grids
What does filtration do? It reduces the patient skin dose.
Compensating filters are used for: Anatomic parts that having varying thickness/absorption properties
The Anode Heel Effect is emphasized under the following conditions: At short SID, with large cassettes, with small anode angle x-ray tubes
Created by: anbrunes