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ORPT 301 > Object Localization, Extraoral Radiography, and Advanced Imaging > Flashcards

Object Localization, Extraoral Radiography, and Advanced Imaging Flashcards

1
Q

What sides can you see and not see in 2D imaging?

A

Can see mesial-distal view, can’t see buccal-lingual

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2
Q

What are 3 techniques of object localization to help determine a spatial relationship? 3 answers.

A
  • Examine 2 conventional 2D images at right angle soft each other
  • Tube shift technique
  • Image anatomy with 3D imaging modality
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3
Q

What does it mean to take 2 conventional 2D images at right angles to each other?

A

Take a PA and an occlusal view radiograph

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4
Q

What does the SLOB mnemonic stand for?

A

Same-side lingual, opposite-side buccal

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5
Q

When the tube head is moved mesially and the object of interest moves mesially, where is it located?

A

Lingual side

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6
Q

When the tube head is moved mesially and the object of interest moves distally, where is it located?

A

Buccal side

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7
Q

What causes superior/inferior positioning changes of objects of interest in a radiograph?

A

Tube shift/change in vertical angulation

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8
Q

What is an extra oral image?

A

The receptor is placed outside the patient’s mouth

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9
Q

What are a few purposes of extra oral radiographs?

A
  • To evaluate large areas of skull/jaws
  • To evaluate growth and development
  • To evaluate impacted teeth
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10
Q

When can intraoral radiographs be challenging?

A

Swelling or discomfort

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11
Q

Where do you place the film inside of to protect it?

A

Cassette

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12
Q

What does the cassette have to reduce x-ray exposure?

A

Intensifying screen

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13
Q

What is the patient placement for a lateral cephalogram?

A

Receptor parallel to midsagittal plane

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14
Q

Where is the central beam for a lateral cephalogram?

A

Beam is perpendicular to the receptor

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15
Q

What is the patient placement for a posterior anterior cephalometric projection?

A

The cantho-meatal line at 10 degrees with the receptor

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16
Q

What is the central beam for a posterior anterior cephalometric projection?

A

Beam is perpendicular to receptor

17
Q

What are the indications of a posterior anterior cephalometric projection? 3 answers.

A
  • Asses jaw skeletal relationships
  • Evaluate craniofacial asymmetry
  • Orthognathic surgical treatment planning
18
Q

What does lateral ceph and PA provide information on?

A

Skeletal relationship in all the three planes

19
Q

What does Water’s projection evaluate?

A

Paranasal sinuses

20
Q

What is the patient placement for Water’s projection?

A

Cantho-meatal line is 37 degree upward to the receptor

21
Q

What is the central beam placement for Water’s projection?

A

Beam is perpendicular to receptor

22
Q

What are the indications for Water’s projections?

A

Displays paranasal sinuses, predominantly the maxillary sinus and to a lesser extent the frontal and ethmoidal

23
Q

What does CBCT utilize?

A

Cone shaped X-ray beam to capture the 3D image

24
Q

What does CBCT stand for?

A

Cone beam computed tomography

25
Q

What is the CBCT detector?

A

Records number of photon exiting the patient

26
Q

What are the three principles of CBCT?

A
  • Collimated x-ray source
  • Detector
  • Synchronously rotate around the patient
27
Q

During each rotation of a CBCT, how may are captured?

A

600-700 images at several hundred rotation angles

28
Q

What is the complete series of images called in a CBCT?

A

Raw data/projection data

29
Q

What is image reconstruction and multiplayer reformation?

A

Stacks of images, projection data, and raw data is imported into viewing software to create 3D anatomical planes of the body

30
Q

What is the axial anatomical plane?

A

Top to bottom

31
Q

What is the coronal anatomical plane?

A

Front to back

32
Q

What is the sagittal anatomical plane?

A

Left to right

33
Q

How are CBCT images stored?

A

In a DICOM format, able to import images in any third party treatment planning software

34
Q

What are four advantages of CBCT?

A
  • Better visualization of structures
  • Better spatial orientation
  • Finer detail
  • Less radiation dose
35
Q

Does a conventional image dose or CBCT have more radiation exposure?

A

CBCT is more radiation

36
Q

Does at CBCT or CT have more radiation exposure?

A

CT has more radiation

37
Q

What are two disadvantages of CBCT?

A
  • Patient motion during the scan creates artifacts
  • Cost of equipment
38
Q
A

ORPT 301 (10 decks)

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