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Radiology > Projection Geometry > Flashcards

Projection Geometry Flashcards

0
Q

When chafing teeth what color do you use when the tooth is congenitally missing?

A

Black

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1
Q

What you should you do first before ordering radiographs?

A

Give the patient an exam * missing teeth * existing restorations

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2
Q

What color do you use to chart existing procedures?

A

Blue

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3
Q

What is different when you chart a gold crown?

A

It is cross hatched

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4
Q

Closer the object to the image receptor the ______ fuzzy the image is around the edges.

A

Less

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5
Q

When the focal spot is _____ away from the object the less fuzzy the image is.

A

Farther

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6
Q

When you decrease the angle at which the image is being taken you elongate the image. T or F

A

False- when you increase the angle the image elongates

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7
Q

List three ways to maximize sharpness and resolution of the image

A

Use a small effective focal spot Increase the distance from the focal spot to the object Decrease the distance from the object to the image receptor

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8
Q

List two ways you can minimize image size distortion

A

Increase focal spot to image receptor distance

Decrease object to image receptor distance

Don’t increase distance too much - the image may not get enough exposure and will end up being white

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9
Q

The film should be parallel with the tooth. T or F

A

True
This will minimize shape distortion.

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10
Q

The central ray should be parallel to film and tooth. T or F

A

False - should be perpendicular

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11
Q

What is foreshortening?

A

The image receptor and tooth are not parallel, the beam or photons is Perpendicualr to the image receptor but NOT the tooth

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12
Q

What is elongation?

A

The tooth and film are not parallel, the beam of photons is perpendicular to the tooth but NOT to the image receptor

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13
Q

What is the preferred method of capturing an image?

A

Parallelling the tooth and film. Beam should be perpendicualr go both

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14
Q

What is the bisecting line angle?

A

The line produced that bisects the angle formed by the image receptor and the central axis of here tooth.

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15
Q

If the preferred method is can not be achieved an individual should use the bisecting line technique. T or F

A

True

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16
Q

How do you use the bisecting line technique?

A

Line the central beam up perpendicular to the bisecting line.. Will still get some distortion or the tooth height and alveolar bone

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17
Q

How do you locate an object on the film?

A

SLOB same lingual opposite buccal

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18
Q

What is SLOB?

A

Same lingual Opposite buccal Doesn’t shift - in the same plane as the teeth

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19
Q

If you shift the tube head medically and take and image and the object moves mesially in the image than it is _____ to the teeth.

A

Lingual

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20
Q

If you shift the tube head to mesially and the object in the image move distally than the object is ________ to the teeth.

A

Buccally

21
Q

What is the cotton roll technique?

A

Helps get a parallel technique

22
Q

What is a periapical film?

A

A film that gets the root tips

23
Q

What is a bitewing?

A

Looking at the crown, inter proximal contacts and the alveolar bone health

24
Q

Full mouth series

A

18 films 6 anterior PAs 8 posterior PAs 4 bitewings

25
Q

1 sensor vs #2 sensor

A

1 is narrower - will need to take more images to get a full moths series

26
Q

Why don’t we take anterior bitewings?

A

You can see the inter proximal contacts in the PAs

27
Q

Bicuspid PAs

A

Should see the distal canine and cuspid on the first molar

28
Q

Molar PAs

A

Should see the distal of there cuspid

29
Q

Bicuspid bitewings

A

Should see the inter proximal contacts of the laterals

30
Q

What is radiolucent

A

Any substance that permits the transmission of X-rays Black or darker colored

31
Q

What is radiopaque

A

Any substance that blocks the transmission of X-rays White or light colored

32
Q

Radiolucent and radiopaque refer to the image on the film. T or F

A

False - refers to the object the photons are passing through

33
Q

What is more opaque? Enamel or dentin Dentin or cementum Cortical bone or calculus bone Dentin and bone

A

Enamel Dentin Cortical bone About the same

34
Q

What makes up the largest portion of the tooth?

A

Dentin

35
Q

Is the pulp Radiolucent or radiopaque ?

A

Radiolucent

36
Q

What lies between the Latin dura and the tooth

A

PDL

37
Q

What type of bone is the alveolar crests.

A

Cortical bone

39
Q

Restorative material appearance varies depending on thickness and ______ _______

A

Atomic number Different atomic numbers (metals) make up different implants - that is why they all look different

40
Q

What anatomy is visible in an anterior maxillary PA?

A

Nasal Fossa Nose soft tissue

41
Q

What anatomy is visible in a posterior maxillary PA?

A

Maxillary Sinus - commonly Maxillary tuberosity - distally Hammulus - distally

42
Q

What anatomy is visible in an anterior mandibular PA?

A

Mental ridge (chin) Lingual Foramen Genial Tubercle ** opacity: tubercle ** radiolucent: foramen

43
Q

What anatomy is visible in a posterior mandibular PA?

A

Mental foramen Mandibular canal (inferior alveolar nerve resides) Mylohyoid Ridge Submandibular Gland Fossa External oblique ridge

44
Q

What objects on an image are lighter on the film?

A

Radioopaque objects

45
Q

What objects on an image are darker on the film?

A

Radiotranslucent objects

46
Q

What is this foramen?

A

Mental Foramen

47
Q

What is this phenomenon called?

A

Forshortening

48
Q

What is this phenomenon called?

A

Enlongation

49
Q

What is the radiopaque structure surrounding the tooth?

A

Lamina dura - continuous with the cortical bone (alveolar bone)

50
Q

Is the periodontla ligament radiopaque or radiolucent?

A
51
Q
A
52
Q

Shape distortion can manifest itself as what? (2)

A

Elongating

Foreshortening

Radiology (5 decks)

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