Exposure & Tech Errors Flashcards
How does the radiograph appear if the receptor was never exposed?
Completely white/blank
How does a radiograph appear if the FILM was exposed to white light
completely black/dark
Overexposed image
-image appears overly dense
-can occur with both film and digital
-cause: too much exposure time
Underexposed radiograph
-image appears too light/not dense enough
-can occur with both film and digital
-cause: not enough exposure time
A “cone cut” results from…
receptor not fully exposed by radiation
-inproper alignment of PID with receptor
How can you prevent film or an imaging plate from being double exposed?
-utilize the imaging plate organizer located on the counter outside of the unit
-after exposing an IP, place all exposed IPs in a cup separate from unexposed IPs
List the types of receptor placement errors
-absence of apical structures (periapicals)
-dropped receptor corner (tilted occlusal plane)
-distal surfaces of canine not visible (bite wings)
-distals of 2nd premolars not visible (bitewings)
Which type of receptors can bending occur with and what is the affect
Imaging plates and film; distortion/stretching of the image
Which type of receptors can creasing occur with and what is the affect
imaging plates and film; radiolucent line from crease is displayed on radiograph
When a film receptor is placed backwards in the mouth, what is the affecting pattern called?
herringbone pattern
“tire track” pattern
What error causes overlapped interproximal contact areas?
incorrect horizontal angulation
What error causes a foreshortened radiograph?
too much vertical angulation
What error causes an elongated radiograph?
insufficient vertical angulation (not enough)
What are some miscellaneous radiograph errors
-wired cable appearing in the image
-debris accumulation on film or IP
-phalangioma (patients finger appears on image)
-double image (receptor exposed twice)
-blurry image
