SINUSES and ORBITS - POSITIONING

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5 Terms

1
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HORIZONTAL BEAM CALDWELL

Pt position: PA. Chin up 15 degrees from OMBL (looks like tip of nose touching board)

CR entrance/exit: nasion

tube angle: none

SID: 40”

Size IR : 10× 12

Collimation: Can cut off top of cranium and chin. Minimal light past ears.

Breathing: suspend

Anatomy? All sinuses demonstrated. Petrous ridges fill lower 1/3 of orbits.

<p>Pt position: PA. Chin up 15 degrees from OMBL (looks like tip of nose touching board) </p><p>CR entrance/exit: nasion </p><p>tube angle: none</p><p>SID: 40”</p><p>Size IR : 10× 12 </p><p>Collimation: Can cut off top of cranium and chin. Minimal light past ears. </p><p>Breathing: suspend</p><p>Anatomy? All sinuses demonstrated. Petrous ridges fill lower 1/3 of orbits. </p>
2
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PARIETOACANTIAL WATERS

Pt position: PA chin up. OMBL 37 degrees to IR. MMBL nearly horizontal

CR entrance: Acanthion

tube angle: none

SID: 40”

Size IR : 10 × 12

Collimation: Cut off jaw and only very tip of cranium.

Breathing: suspend

Anatomy? Petrous ridges below maxillary sinuses

<p>Pt position: PA chin up. OMBL 37 degrees to IR. MMBL nearly horizontal </p><p>CR entrance: Acanthion </p><p>tube angle: none</p><p>SID: 40”</p><p>Size IR : 10 × 12</p><p>Collimation: Cut off jaw and only very tip of cranium. </p><p>Breathing: suspend</p><p>Anatomy? Petrous ridges below maxillary sinuses </p>
3
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LATERAL SINUSES

Pt position: Shoulders obliqued. Affected side of face lateral to the board. IOMBL horizontal to bottom of IR

CR entrance: 0.5 - 1” posterior to outer canthus

tube angle: none

SID: 40”

Size IR : 10 × 12

Collimation: Can cut off mandible and crown of head. Light just past EAM.

Breathing: suspend

Anatomy? All sinuses

<p>Pt position: Shoulders obliqued. Affected side of face lateral to the board. IOMBL horizontal to bottom of IR</p><p>CR entrance: 0.5 - 1” posterior to outer canthus</p><p>tube angle: none</p><p>SID: 40”</p><p>Size IR : 10 × 12</p><p>Collimation: Can cut off mandible and crown of head. Light just past EAM.</p><p>Breathing: suspend</p><p>Anatomy? All sinuses</p>
4
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PA ORBITS

Pt position: PA. OMBL perpendicular to IR

CR entrance: Inf. rim of orbits per Merrills (more like sup. rim IRL)

tube angle: 25 degrees caudal

SID: 40”

Size IR : 10 × 12

Collimation: Can cut off jaw. Should see light beyond sides of head.

Breathing: suspend

Anatomy: need orbits and maxillary sinuses

<p>Pt position: PA. OMBL perpendicular to IR </p><p>CR entrance: Inf. rim of orbits per Merrills (more like sup. rim IRL) </p><p>tube angle: 25 degrees caudal </p><p>SID: 40”</p><p>Size IR : 10 × 12 </p><p>Collimation: Can cut off jaw. Should see light beyond sides of head. </p><p>Breathing: suspend</p><p>Anatomy: need orbits and maxillary sinuses </p>
5
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LATERAL ORBITS

Pt position: shoulders obliqued. Affected side of face lateral to the board. IOMBL horizontal to bottom of IR

CR entrance: outer canthus

tube angle: none

SID: 40”

Size IR : 10 × 12

Collimation: light ~ 1 “ anterior to EAM

Breathing: suspend

Anatomy: orbits and maxillary sinuses

<p>Pt position: shoulders obliqued. Affected side of face lateral to the board. IOMBL horizontal to bottom of IR</p><p>CR entrance: outer canthus </p><p>tube angle: none</p><p>SID: 40”</p><p>Size IR : 10 × 12</p><p>Collimation: light ~ 1 “ anterior to EAM </p><p>Breathing: suspend</p><p>Anatomy: orbits and maxillary sinuses </p>

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