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Mandible projection
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انجمن پرتونگاران برتر ایران [ISPR]

  Name of projection Mandible - PA Area Covered Mandibular rami and lateral portion of body Pathology shown Fractures, dislocations, neoplasms and inflammatory changes Radiographic Anatomy Mandible Radiographic Anatomy IR Size & Orientation 24 x 30cmPortrait Film / Screen Combination Regular (CR and DR as recommended by manufacturer) Bucky / Grid Moving or Stationary Grid Filter No Exposure 68 kVp20 mAs FFD / SID 100cm Central Ray CR perpendicular to IRCR to exit at junction of the…




آخرين مطالب






 
Name of projection Mandible - PA
Area Covered Mandibular rami and lateral portion of body
Pathology shown Fractures, dislocations, neoplasms and inflammatory changes
Radiographic Anatomy Mandible Radiographic Anatomy
IR Size & Orientation 24 x 30cm
Portrait
Film / Screen Combination Regular 
(CR and DR as recommended by manufacturer)
Bucky / Grid Moving or Stationary Grid
Filter No
Exposure 68 kVp
20 mAs
FFD / SID 100cm
Central Ray CR perpendicular to IR
CR to exit at junction of the lips
Collimation Collimate to area of mandible
Markers Inferior and Lateral
Marker orientation PA
Shielding Gonadal (check your department's policy guidelines)
Respiration Suspend
Positioning
  • Patient is standing or sitting facing the upright bucky
  • Rest patients forehead and nose against bucky 
  • Tuck chin in to bring orbitomeatal line (OML) perpendicular to IR
  • Align midsagittal plane perpendicular to midline of bucky/grid
  • Ensure no rotation of the head
  • CR to exit at junction of the lips
Critique

Positioning
Area Covered 
Collimation 
Exposure 
Special Notes  
 

 


Name of projection Mandible - Lateral
Area Covered Entire mandible in lateral view
Pathology shown Fractures and the displacement, dislocations, neoplasms and inflammatory changes
Radiographic Anatomy Mandible Radiographic Anatomy
IR Size & Orientation 24 x 30cm
Portrait
Film / Screen Combination Regular 
(CR and DR as recommended by manufacturer)
Bucky / Grid Moving or Stationary Grid
Filter No
Exposure 65 kVp
16 mAs
FFD / SID 100cm
Central Ray CR to mandibular body
Collimation Four sides of collimation
Closely collimate to mandible
Markers Anterior and Inferior 
Marker orientation AP
Shielding Gonadal (check your department's policy guidelines)
Respiration Suspend
Positioning Erect
  • Patient standing or sitting facing the upright bucky
  • Place the side of interest of the head closest to the bucky
  • Oblique the body slightly to assist with positioning and patient comfort
  • Adjust head into a true lateral position
  • Align midsagittal plane parrallel to IR
  • Align interpupillary line perpendicular to IR
  • CR to mandibular body
Critique

Positioning
Area Covered 
Collimation 
Exposure 
Special Notes  

Name of projection Mandible - Oblique (Left / Right)
Area Covered Rami, condylar and coronoid processes, body and mentum of mandible nearest to IR
Pathology shown Fractures, neoplastic and inflammatory processes
Radiographic Anatomy Mandible Radiographic Anatomy
IR Size & Orientation 18 x 24cm
Portrait
Film / Screen Combination Regular 
(CR and DR as recommended by manufacturer)
Bucky / Grid Moving or Stationary Grid
Filter No
Exposure 60 kVp
16mAs
FFD / SID 100cm
Central Ray CR angled 25° cephalad 
Direct CR to exit mandibular region of interest
Collimation Collimate closely to mandible
Markers Anterior and Inferior 
Marker orientation AP
Shielding Gonadal (check your department's policy guidelines)
Respiration Suspend
Positioning
  • Patient is standing or sitting next to the upright bucky
  • Place head in a lateral position with side of interest against IR
  • If possible have patient close mouth and bring teeth together 
  • Extend neck (to clear the mandible of the cervical spine)
  • Rotate the head in an oblique direction (the degree of obliquity depend upon the section of manible that is of interest) - the area of interest should be positioned parrallel to the IR
    • Head in true lateral position demonstrates ramus 
    • 30° rotation demonstrates body
    • 45 ° rotation demonstrates mentum
    • 10° to 15° rotation provides a general survey of mandible
  • CR angled 25° cephalad
  • Direct CR to exit mandibular region of interest
Critique

Positioning
Area Covered 
Collimation 
Exposure 
Special Notes  
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