10/22: Panoramic Imaging Principles Flashcards

1
Q

what is the biggest indication for pano indication?

A

overal evaluation of dentition

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2
Q

what are advantages of Pano over FMX?

A

less radiation dose
quicker
easier
better for trimus patients

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3
Q

what are the disadvantages of Pano over FMX?

A

lower resolution
overlap of premolars
unequal magnification so measurements are not reliable

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4
Q

how does the pano rotation work?

A

start on right, behind head, end on left

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5
Q

the sensor is never where?

A

back of the patient

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6
Q

the tube is never where?

A

in front of patient

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7
Q

this is a 3-dimensional curved zone where structures are reasonably well-defined

A

focal trough

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8
Q

(T/F) there is 1 center of rotation

A

false

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9
Q

objects closer to the receptor will be

A

narrowed

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10
Q

objects closer to the source will be

A

wider

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11
Q

buccal objects will appear

A

lower

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12
Q

lingual objects will appear

A

higher

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13
Q

what is the beam angulation?

A

-4 degrees

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14
Q

why is the angulation -4?

A

avoid projection of occipital bone

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15
Q

are structures closer to the source projected higher or lower?

A

higher

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16
Q

are structures further to the source projected higher or lower?

A

lower

17
Q

how are the colors found?

A

yellow = lingual (closer to source)
blue = middle
green = buccal (closer to source)

18
Q

how is horizontal magnification determined?

A

position of object within the focal trough

19
Q

the giant tooth blurry tooth is positioned how?

A

lingual because it is wider

20
Q

do you have more degrees of magnification in the anterior or posterior?

A

anterior

21
Q

2 identical objects in both anterior and posterior, will they have the same horizontal magnification?

A

no it will vary

22
Q

where are real images located?

A

between CoR and receptor

23
Q

this is every anatomical structure positioned between CoR and receptor

A

real imaegs

24
Q

these are located between the CoR and the source

A

ghost images

25
Q

what objects cast a ghost image?

A

inferior border of mandible, angle, ramus, jelewry, apron, cervical spine, palate

26
Q

what are the 4 characteristics of ghost images?

A

appear on opposite side
appear higher
appear more blurry
vertical dimension is highly magnified

27
Q

what is images do you see here?

A

ghost of palate
ghost of inferior border of mandible

28
Q
A

no because sensor does not go in front

29
Q
A

ghost image of lead apron

30
Q
A

ghost of cervical spine

31
Q

these are objects that lie posterior to CoR and are intercepted 2 times

A

double real images

32
Q

what is the positioning order for the Pano?

A

remove jelewry
put on lead apron
bite on biteblock groove
sit upright
align central laser line
align frankfurt horizontal plane
close side guides
have patient swallow, close lips, tongue on roof of palate
take image

33
Q

if the patient is slumped, what happens?

A

cervical spine too opaque

34
Q

the frankfurt horizontal plane runs through

A

tragus to infraorbital forament

35
Q

where is the horizontal and vertical magnification equal?

A

central plane of the image layer

36
Q

what causes a double real image of the cervical spine?

A

too far forward

37
Q

ghost image of lead apron is caused by

A

apron behind patients neck