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RADT 456
ARRT reg review
Question | Answer |
---|---|
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? | |