Radiology Flashcards
What is the most common digital image receptor?
charge coupled device
Where is the image stored in a latent image?
within the silver halide crystals
What are the 5 film processing steps?
Development Rinse Fix Wash Dry
What occurs in the development stage?
halide portion of exposed silver halide REMOVED
If the developer is depleted, how does the radiograph turn out?
underdeveloped, LIGHT image
If the developer is too concentrated, how will the image turn out?
overdeveloped, DARK
What occurs in the rinsing step?
film is rinsed to remove developer and stops developing process
What does the fixing solution do to the radiograph?
the solution removes unexposed silver halide and hardens the image
Compare fixing time to developing time:
fixing time is 2X developing time
The kVp affects what aspects of the beam?
quality AND quantity
What filters out low kVp? How does that affect the beam?
aluminum, results in higher energy beam
The size of the focal spot affects the?
resolution
What restricts the size of the beam as it travels down the position indicating device?
Lead collimator
ALARA =
As Low As Reasonably Acceptable
What is the maximum radiation exposure for people who work with radiation in one year?
50 mSv
If an image is elongated, what mistake occurred?
decreased vertical angulation
If an image is foreshortened, what mistake occurred?
Excessive vertical angulation
If an image has overlapped contacts, what mistake occurred?
excessive horizontal angulation
If the image has poor contrast, what mistake occurred?
kVp too high
What is the recommended angulation for a BW?
+5 to +10
How is magnification of a radiograph reduced?
- LONG target-receptor distance (use a long position indicating device)
- SHORT object-receptor distance (place receptor closer to the tooth)
Which method of radiographic assessment is best for identifying small changes in volume in alveolar bone density?
subtraction radiography
Which radiographic assessment is best for identifying small changes in volume in alveolar bone density?
subtraction radiography
If the kVp is too high, how will the image be affected?
image will have low contrast
Bremsstrahlung radiation is created due to interaction of ____ with ____.
electrons with nuclei
What is the latent period?
Time between exposure to radiation and the development of symptoms
What is a stochastic effect?
effect that cannot be predicted
