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genrad 2 > wk 5 (Facial bones, paranasal sinuses, orbital & nasal bones) > Flashcards

wk 5 (Facial bones, paranasal sinuses, orbital & nasal bones) Flashcards

1
Q

Facial Bone - OF 20

SID? 
kVp?
AEC?
Focal?
CR?
Positioning?
A 
SID: 100-115cm 
kVp: 70-75kVp
Centre AEC 
Fine Focal
CR ⊥ to IR @ nasion
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2
Q

collimation of Facial OF 20?

A

superior: vertex
inferior: symphysis menti
lateral: lateral skin margins

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3
Q

Facial - OM projection

SID? 
kVp?
AEC?
Focal?
CR?
Positioning?
A 
SID: 100-115cm 
kVp: 75-85kVp
Centre AEC 
Fine Focal
CR ⊥ to IR @ acanthion

patient tilt head upwards such that MML is ⊥ to IR

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4
Q

collimation Facial OM

A

superior: vertex
inferior: symphysis menti
lateral: lateral skin margins

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5
Q

Facial - Lateral

SID? 
kVp?
AEC?
Focal?
CR?
Positioning?
A 
SID: 100-115cm 
kVp: 65-70kVp
Centre AEC 
Fine Focal
CR ⊥ to IR @ lvl of zygoma between outer canthus and EAM
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6
Q

collimation Facial - Lateral

A

superior: 5-7cam above gabella
inferior: symphysis menti
anterior: nose
posterior: EAM

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7
Q

list down all paranasal sinuses

A
  1. Frontal sinuses
  2. maxillary sinuses
  3. Ethmoidal sinuses
  4. Sphenoidal sinuses
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8
Q

Views for paranasal sinuses?

A
  1. OF 15
  2. OM
  3. Lateral
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9
Q

Paranasal sinuses - OF 15

SID? 
kVp?
AEC?
Focal?
CR?
Positioning?
A 
SID: 100-115cm 
kVp: 70-75kVp
Centre AEC 
Fine Focal
CR ⊥ to IR @ nasion

patient to tilt head up such that OML forms 15degrees to IR

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10
Q

Paranasal sinuses - OM

SID? 
kVp?
AEC?
Focal?
CR?
Positioning?
A 
SID: 100-115cm 
kVp: 75-85kVp
Centre AEC 
Fine Focal
CR ⊥ to IR @ Acanthion
  • patient to tilt head up such that OML forms 37degrees to IR
  • Patient’s MML is perpendicular to IR
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11
Q

collimation - Paranasal sinuses - OF 15

A

superiorly: 5-7cm above gabella
inferiorly: lower lips
lateral: lateral orbits margin

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12
Q

collimation - Paranasal sinuses - OM

A

superiorly: 3cm above gabella (include forehead)
inferiorly: Angle of mandible
lateral: lateral orbital rims

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13
Q

Paranasal sinuses - Lateral

SID? 
kVp?
AEC?
Focal?
CR?
Positioning?
A 
SID: 100-115cm 
kVp: 65-70kVp
Centre AEC 
Fine Focal
CR ⊥ to IR @ 2.5cm posterior to outer canthus
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14
Q

collimation - Paranasal sinuses - Lateral

A

superiorly: 4cm above gabella (include forehead)
inferiorly: Lower Lips
anterior: nose
posterior: EAM

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15
Q

Views for Orbits

A
  1. OF20
  2. OM
  3. OM55
  4. Lateral
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16
Q

orbits - OM

SID? 
kVp?
AEC?
Focal?
CR?
Positioning?
A 
SID: 100-115cm 
kVp: 70-75kVp
Centre AEC 
Fine Focal
CR ⊥ to IR @ acanthion
  • patient to tilt head up such that OML forms 37degrees to IR
  • Patient’s MML is ⊥ to IR
17
Q

orbits - OF 20

SID? 
kVp?
AEC?
Focal?
CR?
Positioning?
A 
SID: 100-115cm 
kVp: 70-75kVp
Centre AEC 
Fine Focal
CR ⊥ to IR @ nasion
  • patient to tilt head up such that OML forms 20 degrees to IR
  • 2 projections, look up view & look down view
18
Q

collimation for orbits - OF 20

A

superiorly: 4cm above gabella
inferiorly: acanthion
lateral: lateral skin margins

19
Q

collimation for orbits - OM

A

superiorly: 3cm above gabella (include forehead)
inferiorly: upper lips
lateral: lateral skin margins

20
Q

orbits - Lateral

SID? 
kVp?
AEC?
Focal?
CR?
Positioning?
A 
SID: 100-115cm 
kVp: 65-70kVp
Centre AEC 
Fine Focal
CR ⊥ to IR @ outer canthus
21
Q

collimation for orbits - Lateral

A

superiorly: 3cm above gabella
inferiorly: upper lips
anterior: tip of nose
posterior: EAM

22
Q

Nasal bone - Lateral

SID? 
kVp?
AEC?
Focal?
CR?
Positioning?
A 
SID: 100-115cm 
kVp: 42-50kVp
Non Grid 
1.2-3mAS
Fine Focal
CR ⊥ to IR @ 1cm inferior and posterior to nasion
23
Q

collimation for nasal bone - Lateral

A

superiorly: gabella
inferiorly: upper lips
anterior: tip of nose
posterior: outer canthus of eyes

24
Q

Nasal bone - OM

SID? 
kVp?
AEC?
Focal?
CR?
Positioning?
A 
SID: 100-115cm 
kVp: 75-85kVp
Center AEC
Fine Focal
CR ⊥ to IR @ acanthion
  • Patient to tilt head upwards such that MML is ⊥ to IR
  • patient’s OML forms 37 degrees
25
Q

collimation for nasal bone - OM

A

superiorly: gabella (include forehead)
inferiorly: lower lips
lateral: lateral neck skin margins

26
Q

what is Le fort 1?

A
  • fracture through floor of antra and nasal septum

- may show tooth in base of maxillary antrum

27
Q

what is le fort 2?

A
  • transverse fracture through bridge of nose and ethmoid

- oblique fracture from inferolateral margin of antra to floor of orbits

28
Q

what is le fort 3?

A
  • fracture through medial and lateral walls

- zygomatic arches, cribriform plat and base of pterygoid producing free maxilla

29
Q

functions of paranasal sinuses

A
  1. humidifying and warming inspired air
  2. regulation of intranasal pressure
  3. increasing surface area of olfaction
  4. lightening the skull
  5. resonance
  6. absorbing shock
  7. contribute to facial growth

genrad 2 (4 decks)

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