extraoral radiography- cephalometric & skull proj

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15 Terms

1
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skull projection definition

radiographs of the whole head (craniofacial skeleton)

2
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cephalometric radiographs definition

type of skull projection w standardized projection geometry and known magnification (reproducible- can compare images over time)

3
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cephalometric projections are predominantly used for

orthodontic and orthognathic surgical dx and tx planning

4
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what is cephalometry

measurement and comparison of specific points, distances, and lines within the facial skeleton

5
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since cephalometric projections are reproducible, what can they be used to monitor

growth and tx progress and outcomes

6
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what are they types of cephalometric projections

lateral and posteroanterior

7
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what is a cephalostat

device that maintains a constant relationship between the skull, the receptor, and the x-ray beam; also helps stabilize and immobilize pt

8
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in cephalometric projections, the measurement scale on the nasion stabilizer allows for…

determination of magnification on the radiograph

9
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how is magnification minimized in cephalometric projections

  • long source-to-object distance (150 cm)

  • short object-to-receptor distance (15-20 cm)

10
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in cephalometric projections, are structures closer to the receptor magnified more or less than those located closer the source

closer to the receptor are magnified less than those closer to the source

11
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lateral cephalometric projections are most used…

in orthodontics

12
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what is the pt positioning in lateral cephalometric projections (4)

  • mid-sagittal plane vertical, paralleling receptor

  • Frankfort plane horizontal

  • maximum intercuspation

  • pt R side toward the receptor

<ul><li><p>mid-sagittal plane vertical, paralleling receptor </p></li><li><p>Frankfort plane horizontal </p></li><li><p>maximum intercuspation </p></li><li><p>pt R side toward the receptor </p></li></ul><p></p>
13
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in lateral cephalometric projections, to better image the anterior facial soft tissue profile, is the amount of radiation to area dec or inc

dec

14
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in posteroanterior projections, what is the pt positioning (4)

  • pt facing receptor

  • mid-sagittal plane vertical, perpendicular to receptor

  • Frankfort plane horizontal, perpendicular to the receptor or forehead-nose position

  • maximum intercuspation

<ul><li><p>pt facing receptor </p></li><li><p>mid-sagittal plane vertical, perpendicular to receptor </p></li><li><p>Frankfort plane horizontal, perpendicular to the receptor or forehead-nose position </p></li><li><p>maximum intercuspation </p></li></ul><p></p>
15
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posteroanterior projections show…

  • mid-facial skeleton

  • allows assessment of mediolateral and vertical dimensions

<ul><li><p>mid-facial skeleton </p></li><li><p>allows assessment of mediolateral and vertical dimensions </p></li></ul><p></p>