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Radiology > Dental Radiography > Flashcards

Dental Radiography Flashcards

1
Q

True or False: the dental radiograph unit is similar to standard full body radiograph unit

A

True

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2
Q

What are the three standard units of dental radiography?

A

milliampere (mA), peak voltage (kVp), time (s)

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3
Q

What are the 3 basic types of dental rad machines available?

A

Stationary (wall mount), portable (wheel based), handheld

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4
Q

True or False: Dental radiology units generally produce smaller volumes of radiation, but when repeat exposures are taken, the total exposure can become just as high as a standard x-ray unit

A

True

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5
Q

How far away should you be when obtaining dental radiographs?

A

Minimum of 6 feet away from the tube head & at a 90-135 degree angle from the tube head

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6
Q

What are you to do if you are unable to keep the required distance away from the tube head?

A

Wear PPE - lead gowns, thyroid shield
Dosimetry badge

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7
Q

True or False: Your hands can be in the primary beam of the xray

A

False

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8
Q

What are examples of positioning devices with dental rads?

A

Rolled gauze, tongue depressors, hair curlers, paper twoels

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9
Q

What are the 3 basic components of a dental xray machine?

A

xray tube head, adjustable arm, control panel

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10
Q

What is in the tube head of the dental rad machine?

A

Cathode and anode are located w/in the tube head
Its the location where the production of x-rays occur

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11
Q

What is a position indicating device (PID)?

A

Its contained in the tube head;
It helps collimate the xrays and provide less scatter radiation

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12
Q

The ______ the PID is to the patient & film, the _____ the image will be due to ______ in scatter radiation

A

closer; better; decrease

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13
Q

What is the tube head attached to?

A

An adjustable arm

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14
Q

What does the adjustable arm do?

A

Allows movement of the tube head and is used to hold the tube head in place while xrays are taken

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15
Q

What does the control panel contain?

A

unit settings (preset)

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16
Q

What is the most common setting that can be adjusted?

A

Time

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17
Q

What does a pictogram of the animal’s oral cavity allow?

A

Allows the tech to select the size of the animal and select the tooth being imaged

18
Q

What is used if the control panel doesn’t contain a pictogram or kVp and mA are not preset?

A

A technique chart

19
Q

What are the three types of image receptor devices in dental radiology?

A

film, digital sensors, phosphor plates

20
Q

True or False: Intraoral dental films comes in different speeds just as with standard radiography film

A

True

21
Q

What occurs with fast film?

A

It requires less radiation but results in an increase grain of the image

22
Q

What film types are commonly used?

A

D, E, F –> requires less radiation to produce the image

23
Q

D type film

A

most commonly used in vet med
Comes in different sizes (0,2,4 - most common)

24
Q

What does the foil sheet do in packaged film?

A

Its used to decrease scatter radiation

25
Q

What does the black paper do for the film?

A

It surrounds it for protection

26
Q

What is an advantage of digital dental radiology?

A

50-90% reduction in radiation needed to produce an image; the image is also immediately available

27
Q

What is the most common sensor size for digital dental imaging?

A

Size 2 (some produce a size 4 sensor)

28
Q

What must be placed on the sensor to help prevent cross-contamination?

A

protective hygiene sleeve; add a layer of vet wrap around the sensor to help hold the sensor in place while taking rads

29
Q

What happens if a facility doesn’t have size 2 and 4 sensors?

A

multiple views are to be taken of the entire tooth for larger teeth

30
Q

What is the phosphor plate system?

A

a unique system that combines the versatility of film w/ benefits of digital imaging

31
Q

what are the advantages of phosphor plates?

A

ease of use, versatility, availability of multiple sizes of plates (from 0-6), and no chemicals needed for processing

32
Q

What is the primary drawback for phosphor plates?

A

high initial cost of the unit
removing of the plate for prcoessing can make retakes more difficult because identical replacement of the film in the oral cavity is difficult

33
Q

How are intraoral films developed?

A

Using a chair-side developer but it can take hours to dry

34
Q

What is a chairside developer?

A

A lightproof box that has 2 hand holes in the front & a translucent filter lid on top to allow the tech to see what they’re doing while processing the film

35
Q

What are the 3 patient positions for dental rads?

A

sternal, dorsal, lateral

36
Q

What is the goal of dental imaging? How does it occur?

A

get as much root as possible; place the crown of the tooth to the edge of the sensor

37
Q

How many films are taken for a cat? For a dog?

A

Cat: 8 films
Dog: 12 films

38
Q

What are the two standard intraoral radiograph techniques?

A

parallel technique, bisecting angle technique

39
Q

What is the parallel technique?

A
  • easiest to master
  • same theory used in the oral cavity that is used for lateral imaging of the body
  • used to obtain images of the mandibular fourth premolars and molars in dogs & cats
40
Q

How do you set up a radiograph using the parallel technique?

A
  • sensor is placed in the mouth parallel to the teeth being imaged
  • PID is placed as close to the patient as possible
  • patient should be in dorsal recumbency
  • tube head should be placed at 0 degrees so that it’s directly perpendicular to the tooth
  • important: when obtaining images of molars in the dogs that the sensor is placed AS FAR BACK in the mouth as possible so that the last molar tooth is images
41
Q

What is the bisecting angle technique?

A
  • obtains images of teeth within the hard palate of the maxilla and mandibular symphysis
  • uses the plane of the root of the tooth of interest, compared to the plane of the sensor when placed in the oral cavity
  • a line halfway between these two lines makes up the bisecting angle
  • PID is placed parallel and as close to the patient as possible and on the imaginary bisecting angle line
42
Q

What can you do to take images of patients in sternal recumbency?

A

place a towel or fluid bag under their chin - helps to maintain this parallel positioning

Radiology (10 decks)

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