Radiology Best Answer
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- 1.The penetrating power of xrays depend on
- A.
Kvp
- B.
Ma
- C.
Film speed
- D.
Focal film distance
- 2.The size of the collimated beam for intraoral radiology measured at the patient skin is
- A.
1.5 to 1.75 inches
- B.
2.0 to 2.25 inches
- C.
2.75 to 3.00 inches
- D.
3.25 to 3.50 inches
- 3.Filtration of the xray beam protects the patient by
- A.
Eliminating all radiation from the xray head
- B.
Eliminating weak wavelength xrays from the x ray beam
- C.
Eliminating short wavelength x rays from the xray beam
- D.
Decreasing exposure time
- 4.The most penetrating xrays have
- A.
Low frequencies
- B.
Soft rays
- C.
Long wavelengths
- D.
Long wavelengths
- E.
Short wavelengths
- 5.The x ray which is at the center of the primary beam is called the
- A.
Cathode ray
- B.
Secondary ray
- C.
Restricted beam
- D.
Central ray
- 6.The housing of the xray tube is
- A.
Copper
- B.
Plastic
- C.
Tungsten
- D.
Glass
- 7.As the target film distance is increased there is
- A.
More chance of elongation
- B.
More chance of overlapping
- C.
More chance of foreshortening
- D.
Less distortion
- 8.Overlapping is a result of
- A.
Incorrect vertical angulation
- B.
Incorrect horizontal angulation
- C.
Excessive bending of the film
- D.
All of the above
- 9.After a film is exposed, the target film distance is doubled. the exposure time necessary to obtain a second film of equal density to the first film is
- A.
The same as the first film
- B.
Twofold
- C.
Threefold
- D.
Fourfold
- 10.Wich cells are the most sensitive to xrays?
- A.
Muscle
- B.
Nerve
- C.
Sperm
- D.
Epithelial
- 11.Which cells are the least sensitive to x rays?
- A.
Ova
- B.
Blood
- C.
Sperm
- D.
Nerve
- 12.The first sign of x ray dermatitis is
- A.
Loss of hair
- B.
Purulent exudate
- C.
Erythema
- D.
Pain
- 13.Scatter radiation is a type of
- A.
Secondary radiation
- B.
Primary radiation
- C.
Stray radiation
- D.
None of the above
- 14.The lead foil in the xray film packet is used to
- A.
Stop unused radiation
- B.
Tell the front of the film from the back
- C.
Prevent film fogging
- D.
Decrease operator's radiation exposure
- 15.The quality or penetrating power of secondary radiation is
- A.
More than that of primary radiation
- B.
Less than that of primary radiation
- C.
The same as that of primary radiation
- D.
Unrelated to that of primary radiation
- 16.If a radiograph remains in the developing solution too long the film will be
- A.
Lighter
- B.
Darker
- C.
Lighter only if the temperature is increased
- D.
Unaffected because time is not a factor
- 17.Film fog may occur if there is
- A.
A light leak in the darkroom
- B.
Bending of the film
- C.
Reversal of the film
- D.
Extremely thick bone
- 18.Films not fixed for a long enough period of time will appear
- A.
To have black lines running through them
- B.
To be brittle
- C.
To have a brown tint
- D.
White
- 19.Film is washed after removing it from the developing solution to
- A.
Remove any debris on the film
- B.
Speed up the developing process
- C.
Stop the developing process
- D.
Remove the precipitated silver salts
- 20.In order for the developing chemicals to work, the solution must be
- A.
Acidic
- B.
Neutral
- C.
Basic
- 21.Fixing the film
- A.
Removes the unaffected silver salts
- B.
Removes the affected silver salts
- C.
Softens the film
- D.
Peels the emulsion from the film base
- 22.The fixing solution is
- A.
Acidic
- B.
Neutral
- C.
Basic
- D.
First basic then neutral after dilution
- 23.Reticulation is
- A.
Cracking of the film emulsion
- B.
An electric charge in the developing solution
- C.
A latent image
- D.
Due to excess radiation
- 24.The optimum time temperature relationship for processing dental radiographs is
- A.
74 f for 4 1/2 minutes
- B.
68 F for 6 minutes
- C.
50 F for 5 minutes
- D.
Varied according to manufactures specification
- 25.The panoramic radiograph is not diagnostic for
- A.
Caries detection
- B.
General survey
- C.
Confirmation of mandibular fractures
- D.
Detection of impacted wisdom teeth
- 26.Bitewing radiographs are useful in helping to determine
- A.
Interproximal caries
- B.
Proximal bone height
- C.
Fit of crowns
- D.
All of the above
- 27.The radiograph film is covered with an emulsion of
- A.
Silver bromide salts
- B.
Cellulose
- C.
Silver acetate
- D.
Potassium bromide
- 28.The raised button on the radiogph aids in
- A.
Processing
- B.
Drying
- C.
Mounting
- D.
Determining film speed
- 29.Film speed is determined by the
- A.
Amount of silver bromide salt
- B.
Thickness of cellulose acetate base
- C.
Size of the silver bromide crystal
- D.
Side of the film exposed
- 30.The best technique for reducing the radiation exposure to both patient and operator is the use of
- A.
An automatic timer
- B.
Fast film
- C.
Thinner films
- D.
A thicker cellulose acetate base
- 31.The most radiolucent structure of a tooth is the
- A.
Enamel
- B.
Dentin
- C.
Cementation
- D.
Pulp chamber
- 32.The most radiopaque structure of the tooth is the
- A.
Enamel
- B.
Dentin
- C.
Cementation
- D.
Pulp chamber
- 33.To visualize the two roots on the maxillary first premolar the central ray should be directed.
- A.
Perpendicular to the buccal surface
- B.
Slightly from the mesial surface
- C.
Slightly from the distal surface
- 34.The operator must avoid
- A.
Stray radiation
- B.
Secondary radiation
- C.
The primary beam
- D.
All of the above
- 35.The chemicals used in processing solutions are dissolved in
- A.
Cellulose acetate
- B.
Distilled water
- C.
A thick emulsion
- D.
Potassium bromide
- 36.If an unexposed film is processed it will appear
- A.
White
- B.
Black
- C.
Blue
- D.
Clear
- 37.Secondary radiation emanates from the
- A.
Patient mouth
- B.
Exposed film
- C.
Closed end of cone
- D.
All of the above
- 38.To avoid gonadal exposure to x ray which of the follwing may be used
- A.
Higher kvp
- B.
Lead apron
- C.
Finer detailed film
- D.
Increased vertical angulation
- 39.When radiographs are taken of a pregnant patient
- A.
Periapical rather than bitewing films should be taken
- B.
Bitewing rather than periapical films should be taken
- C.
The patient should be treated as all other patients
- D.
As few film as possible should be taken
- 40.Who should hold the film in a patient's mouth if he or she is unable to do so
- A.
The dentist
- B.
The assistant
- C.
A friend or relative
- D.
The receptionist
- 41.When exposing a radiograph the operator should stand
- A.
Al least six feet from the xray head
- B.
Two feet to the right of the primary beam
- C.
Any distance in back of the xray head
- D.
Four feet in front of patient
- 42.The maximum whole body dose cosidered permissible to those who work with radiation is
- A.
0.1 rem /wk
- B.
1 rem/wk
- C.
10 rems/wk
- D.
100rem/wk
- 43.The gratest danger to the operator is
- A.
The central ray
- B.
Secondary radiation
- C.
Primary x ray beam
- D.
All of the above are of equal danger
- 44.Which characteristic of xrays makes them both beneficial and hazardous?
- A.
They destroy tissue
- B.
They cause embolisms
- C.
They use the body's heat
- D.
They cause large fatty deposits to form
- 45.A technique used to measure the operator 's exposure to radiation is
- A.
To check the color of the operator's fingers
- B.
For the operator to wear a radiation film badge
- C.
The frequency of stomach pains
- D.
To multiply the nunber of films the operator has exposed by 0.1 rem
- 46.A constant source of radiation is
- A.
Strontium 90
- B.
Natural elements
- C.
The sun
- D.
All of the above
- 47.The amount of radiation a person receives
- A.
Begings anew each day
- B.
Is cumulative only on the skin
- C.
Is cumulative in the entire body
- D.
None of the above
- 48.Maximum protection of the patient requires that the xray beam pass though a (n)
- A.
Plastic closed ended cone
- B.
Shielded open ended cone
- C.
Water filter
- D.
Oil filter
- 49.Occlusal films are used to determine
- A.
Mesiodistal orientation of a tooth
- B.
Buccal lingual orientation of a tooth
- C.
The presence of anterior caries
- D.
None of the above
- 50.Small silver halide crystals on the film result in
- A.
More radiation to the patient
- B.
Better detail
- C.
Slower film
- D.
Faster film
- E.
Film fogging
- 51.Intensifying screems
- A.
Are used in intraoral films
- B.
Decrease exposure
- C.
Create additional x rays
- D.
Fuse with the film
- 52.Which extraoral film is used to visualized the sinus?
- A.
Lateral oblique film
- B.
Lateral skull film
- C.
Waters films
- D.
Posterior anterior film
- 53.The principle used in panoramic radiography is
- A.
Long cone
- B.
Laminography
- C.
Horizontal curvature
- D.
Panoramography
- 54.The temperature of the radiographic processing solutions is adjusted by
- A.
Individual heaters
- B.
Chemical interaction
- C.
A temperature adjustable water bath
- D.
Gas heaters
- 55.Which type of film cannot be used intraorally?
- A.
Bitewing
- B.
Occlusal
- C.
Periapical
- D.
None of the above
- 56.Periapical film
- A.
Show the entire tooth
- B.
Show the supporting structure of the tooth
- C.
Come in various sizes
- D.
All of the above
- 57.The occlusal plane of the arch being radiographed should be
- A.
Perpendicular to the floor
- B.
Parallel to the floor
- C.
At an angle of 45 degree to the floor
- D.
At an angle of 30 degree to the floor
- 58.The ala-tragus line is parallel to the floor when taking
- A.
Maxillary periapical films
- B.
Bitewings
- C.
Maxillary occlusal films
- D.
All of the above
- 59.When using the bisecting the angle technique
- A.
The central beam is perpendicular to the floor
- B.
The central beam is perpendicular to the tooth
- C.
The central beam is perpendicular to the line
- D.
Bisecting the angle formed by the tooth and film
- E.
The central beam is perpendicular to the cheek
- 60.When using the paralleling technique
- A.
The film is parallel to the tooth
- B.
The film always touches the tooth
- C.
You must use an 8 inch plastic cone
- D.
All of the above
- 61.Film racks should be
- A.
Clean and dry
- B.
Numbered and lettered
- C.
Neither of the above
- D.
Both of the above
- 62.Light films will result from
- A.
Underdeveloping
- B.
Overdeveloping
- C.
Underexposure
- D.
Overexposure
- E.
Overfixing
- 63.Dark films will result from
- A.
Underdeveloping
- B.
Overdeveloping
- C.
Underexposing
- D.
Overexposing
- E.
Overfixing
- 64.Film placement of the film will help prevent
- A.
Overlapping
- B.
Foreshortening
- C.
Gagging
- D.
Elongation
- 65.Periapical films should extend beond the occlusal plane
- A.
1/8 inch
- B.
1/4 inch
- C.
3/8 inch
- D.
1/2 inch
- 66.If a film is exposed on the wrong side the result will be
- A.
Darker films
- B.
No image at all
- C.
No effect
- D.
A herringbone pattern
- 67.Xray are most effectively stopped by
- A.
A vacuum
- B.
Tungsten
- C.
Copper
- D.
Lead
- 68.Blurred films may result from
- A.
Incorrect vertical angulation
- B.
Movement of the patient
- C.
Increased kvp
- D.
Old film
- 69.The usual number of films in a complete dentulous radiographic survey is
- A.
10
- B.
18
- C.
24
- D.
26
- 70.In the paralleling technique a device which is used to hold the film in the patient's mouth is
- A.
The patient's finger
- B.
A bite block
- C.
A second film
- D.
All of the above
- 71.Elongation is caused by
- A.
Insufficient vertical angulation
- B.
Too much vertical angulation
- C.
Insufficient horizontal angulation
- D.
Excessive bending of the film
- 72.Cone cutting results from the central ray
- A.
Not being aimed at the center of film
- B.
Having incorrect horizontal angulation
- C.
Having insufficient vertical angulation
- D.
Being eliminated from a closed plastic cone
- 73.Black lines across the film may be the result of
- A.
Cone cutting
- B.
Souble exposure
- C.
Excessive bending
- D.
Underexposure
- 74.Proper patient positioning for intraoral films requires the sagittal plane be
- A.
Parallel to the floor
- B.
Perpendicular to the floor
- C.
Parallel to the central ray
- D.
Perpendicular to the central ray
- 75.If the sagittal plane of the patient 's head is positioned incorrectly the result may be
- A.
Overlapping
- B.
Elongation
- C.
Darker films
- D.
All of the above
- 76.Exposure time is determine by
- A.
Kvp
- B.
Ma
- C.
The patient's weight
- D.
Vertical angulation
- E.
Area being radiographed
- 77.When seating the patient the operator should
- A.
Tell the patient what is being done
- B.
Have the patient remove eyeglasses
- C.
Have the patient remove intraoral removable appliances
- D.
All of the above
- 78.Vertical angulation in the bisecting technique for the same radiograph may differ in patients due to
- A.
The size of the teeth
- B.
Anatomic differences
- C.
Gagging
- D.
Age
- 79.a latent image is
- A.
An image taken with a long exposure
- B.
Found on only fast films
- C.
Composed of energized silver halide crystals
- D.
A very light image on the developed film
- 80.Exposure of a radiograph on a child
- A.
Requires less time than an adult
- B.
Requires more time than an adult
- C.
Requires the same time as an adult
- D.
Should never be taken
- 81.Which of the following conditions cannot be identified radiographically?
- A.
Herpetic lesions
- B.
Periodontitis
- C.
Salivary stones
- D.
Frenum
- E.
Root tips
- 82.The strength of the safelight permitted in the darkroom depends on the
- A.
Bulb in the safelight
- B.
Light tightness of the room
- C.
Sensitivity of the film
- D.
Tooth being radiographed
- 83.Extraoral films are
- A.
More sensitive to light than intraoral films
- B.
Less sensitive to light than intraoral films
- C.
Just as sensitive to light as intraoral films
- D.
Not sensitive to light
- 84.How often should the processing solutions be changed
- A.
Each week
- B.
Every 3 to 4 weeks
- C.
Every5 to 6 weeks
- D.
Every 7 to 8 weeks
- 85.The thermometer used to measure the temperature of the processing solutions is located
- A.
In the developer
- B.
In the wash water
- C.
In the fixer
- D.
Above the processing solutions
- 86.The best way to dry processed films is to
- A.
Place them on paper towels
- B.
Hang them suspending the films in air
- C.
Place them in envelopes
- D.
Place them flat on the counter
- 87.Extraoral films are placed in rigid frames called
- A.
Fim frames
- B.
Skull plates
- C.
Jaw plates
- D.
Cassttes
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