Exposure And Technique Errors

Question 1

How will and overexposed image appear

Answer 1

Dark

Question 2

How will and underexposed image appear

Answer 2

Light

Question 3

How will film exposed to light appear?

Answer 3

Black

Question 4

How will and unexposed receptor appear

Answer 4

Clear

Question 5

How will a reversed receptor appear

Answer 5

Blank or white

Question 6

Too much vertical angulation results and images that are:

Answer 6

Elongated

Question 7

Two little vertical angulation results and images that are:

Answer 7

Foreshortened

Question 8

Incorrect horizontal angulation results in images that are:

Answer 8

Overlapped

Question 9

Which errors can occur with a bite wing technique?

Answer 9

Overlapped contacts, elongation and cone cut

Question 10

Which errors can occur with the bisecting technique?

Answer 10

Overlapped contacts, elongation, con cut and phalangioma

Question 11

What are some reasons for underdevelopment of analog film? How will the radiograph appear?

Answer 11

• Premature removal of film from developer
• Weak developer solution
• Radiograph lacks density

Will appear light

Question 12

If analog processing solution is cold, How will the radiograph appear? What causes it?

Answer 12

Low temperature retards the developing or fixing reaction with the emulsion of film

Film must be left in solution for extra time
Image will be light

Question 13

What would cause a radiograph to be underexposed? How will the radiograph appear?

Answer 13

-Inadequate amount of X-rays generated from tube
-xrays did not penetrate the dense tissue
-button must be pressed until unit automatically shuts off
Not enough KVP-MA- exposure time

Image will appear light

Question 14

Excessive bending

Answer 14

Most frequently found on cuspid regions and palatal exposures

Portion of the receptor which is bent will have an image similar to an elongated image

Roots distorted/crown clear caused by bending of the receptor

Question 15

Causes of dark images in analog film

Answer 15

Over development
Solutions are too warm
KVP-MA-exposure time too high

Question 16

Causes of fogged film and reduction in contrast

Answer 16

Age- Outdated film was utilized
Storage- Film was stored in warm, damp area or near fine producing chemicals
Radiation- film not properly protected before/after exposure
Safelight- incorrect size of safe bulb or incorrect wattage
Filter- scratched filter
White light- light leak around door in dark room
Processing- contaminated chemicals
Chemical- film developed too long or at too high temp
Cigarette fog- smoking in darkroom

Question 17

Causes for blank film

Answer 17

No xrays generated through tube
Solutions too warm
Film put in fixer before developing can dissolve film base

Question 18

Causes of black film

Answer 18

Exposed to white light

Improper filter or safe light

Question 19

Cause of white streaks or spots

Answer 19

Fixer came in contact with film before it was developed

Darkroom table contaminated w/fixer

Film clip contaminated w/ fixer

Question 20

Cause for black streaks or spots

Answer 20

Drop of developing solution prematurely developed film

Question 21

Dark brown or gray film

Answer 21

Film not properly fixed

Not left in fixer long enough

Fixing solution is weak from age or overuse

Question 22

Brown yellowish stain

Answer 22

Insufficient rinsing after film is completely processed

Question 23

Scratched film/PSP receptor

Answer 23

Laying film/receptor/sensor on unclean surface

Placing against sharp or pointed object

Question 24

Finger prints

Answer 24

Touching film with fingers contaminated with developer

Question 25

Thin black lines

Answer 25

Static electricity produced when the film was pulled out of the wrapping too fast

Question 26

Partial image

Answer 26

Level of developer or fixer was too low to cover the entire film

Replenish solutions to proper levels or fasten films to lower clips on hanger

Question 27

Causes for reversed film

Answer 27

Wrong side of film facing the tube

Herringbone pattern or other lead foiled pattern

Dot will be reversed when mounting

Question 28

Causes of double exposure

Answer 28

Previously exposed receptor is re-exposed

Question 29

Incorrect vertical receptor placement errors

Answer 29

Receptor is placed too high or low and spices or occlusal will not be present on receptor

Receptor should be placed 1/8-1/4” above or below the occlusal plane except for max bicuspid 1/4”

Question 30

Horizontal receptor placement errors

Answer 30

Proper teeth may not be exposed on specific exposure

Question 31

Causes of blurred images

Answer 31

Tube head moves slightly

Patients head moves

Question 32

Causes of superimposed images

Answer 32

Failure to remove partial or denture

Rays can penetrate acrylic

Rays cannot penetrate metal

Question 33

What is a phalangioma?

Answer 33

Finger superimposed over an image