Density
Contrast
Recorded Detail
Distortion
Quiz Q's
100
the degree of overall blackening from the black metallic silver deposited in the emulsion of film.
What is the definition of density.
100
The controlling factor of contrast is...?
What is kVp!!
100
the definition of recorded detail.
What is the degree of geometric sharpness or accuracy of the structural lines actually recorded in the image.
100
what changes in SID and OID reduce size distortion.
What is greater SID and smaller OID.
100
the part of the x-ray tube that supplies the electrons.
What is the cathode.
200
mAs
What is the controlling factor of density.
200
the effect a grid has on contrast.
What is improved contrast by removing scatter.
200
recorded detail is improved with what changes in SID and OID.
What is increased SID and decreased OID.
200
magnification factor formula.
What is SID/SOD.
200
true/false... in the lower kVp ranges, a smaller change in kVp will have a greater impact on x-ray emission.
What is True.
300
the guide to maintaining the same image receptor exposure and film density when kVp changes.
What is the 15% rule.
300
the difference between adjacent densities.
What is the definition of contrast.
300
what is the difference between umbra and penumbra.
What is the umbra is the distinctly sharp area of a shadow, penumbra is the imperfect unsharp shadow surrounding the umbra.
300
define distortion.
What is the misrepresentation of the size or shape fo the structures being examined.
300
what part of the transport system is made of guides to direct the film to go in the correct direction from tank to tank?
What is the cross over networks.
400
as the tissue thickness, avg atomic # of the tissue and/or tissue density increases...
What is film density decreases.
400
an underexposed or overexposed film will result in what type of contrast.
What is decreased contrast.
400
define voluntary and involuntary motion.
What is direct control and unconscious control movements of the patient.
400
how can shape distortion be used to an advantage.
What is to avoid superimposition of anatomical structures.
400
useful optical densities lie between...
What is 0.25 and 2.25
500
expression of the change in intensity when the distance changes.
What is the inverse square law formula.
500
describe high and low contrast.
What is high= short scale and low kVp, low= long scale and high kVp
500
list the best methods for reducing motion.
What is communication, reduction of exposure time and immobilization.
500
define elongation.
What is projection of an object so it appears to be longer than it really is.
500
the 5 different names for recorded detail
What is detail, definition, sharpness, resolution and spatial resolution.
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