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RADT 456

ARRT reg review

QuestionAnswer
Geometric blur can be evaluated using what three devices? pinhole camera, slit camera, star pattern
In electronic imaging, as digital imaging matrix size increases what happens to pixel size? pixel size decreases
During film-screen imaging, the manifest image is formed during what stage of processing? in the developer solution during processing
SID affects recorded detail in what way? Recorded detail is directly related to SID.
An increase in kilovoltage will have what effects? more scattered radiation will be produced and the exposure rate will increase
The x-ray tube used in CT must be capable of what three things? high-speed rotation, short pulsed exposures, withstanding millions of heat units
Decreasing field size from 14 by 17 inches to 8 by 10 inches with no other changes will do what? decrease radiographic density and decrease the amount of scattered radiation generated within the part
The component of the CR image plate that records the radiologic image is what? photostimulable phosphor
The term windowing describes the practice of what? changing the image contrast and or density
List three acceptable methods of minimizing motion unsharpness. suspended respiration, short exposure time, patient instruction
How should unopened boxes of radiographic film should be stored? stored away from radiation and in vertical position
X-ray photon energy is inversely related to what? photon wavelength
List three characteristics of DR. solid-state detector receptor plates, a direct-capture imaging system, immediate image display
Compared with a low-ratio grid, a high-ratio grid will do what? absorb more scattered radiation and absorb more primary radiation
As resolution in CR increases, what happens to the laser beam and crystal size? laser beam size decreases and PSP crystal size decreases
What is the purpose of the automatic processor's transport system? move the film and change its direction
For the same FOV, spatial resolution will be improved using what? a larger matirx
List three factors that contribute to the efficient performance of a grid. grid ratio, number of lead strips per inch, amount of scatter transmitted through the grid
List three things that affect the exposure rate of the primary beam. milliamperage, kilovoltage, distance
When the intensification factor increases what happens to the density? radiographic density increases
List three factors that contribute to the efficient performance of a grid. cathode to anode
What methods can be used to limit the production of scattered radiation? using prone position for abdominal exams and restricting the field size to the smallest practical size
List three things that affect the exposure rate of the primary beam. milliamperage, kilovoltage, distance
Small crescent-shaped artifacts on processed x-ray film usually are the result of what? acute bending of the film before or after exposure
Misalignment of the tube-part-IR relationship results in what? shape distortion
When the intensification facotr increases what happens to the density? radiographic density increases
Grid cutoff, when using focused reciprocating grids, is caused by what? inadequate SID
Radiographic contrast is the result of what two things? differential tissue absorption and emulsion characteristics
Greater latitude is available to the radiographer in what circumstances? using high-kv technical factors and using a low-ratio grid
Small crescent-shaped artifacts on processed x-ray film usually are the result of what? acute bending of the film before or after exposure
As intensifying screen speed increases, how is radiographic density affected? increases
Using a 48 inch SID, how much OID must be introcuced to magnify an object two times? a 24 inch OID
What determines the quantity of fluorescent light emitted from a fluorescent screen? thickness of the phosphor layer, type of phosphor used, phosphor size
Misalignment of the tube-part-IR relationship results in what? shape distortion
Grid cutoff when using focused reciprocating grids are caused by what?
Greater latitude is available to the radiographer in what circumstances? using high-kv technical factors and using a low-ratio grid
The relationship between the intensity of light striking a film and the intensity of light transmitted through the film is an expression of what? radiographic density
increases
Using a 48 inch SID, how much OID must be introcuced to magnify an object two times? a 24 inch OID
For the same FOV, spatial resolution will be improved using what?
Created by: jmbickett