Zygomatic Arches Positioning

Question 1

What IR does the submentovertical (SMV) zygomatic arches use?

Answer 1

10x12 portrait

Question 2

What is the breathing technique used for the submentovertical (SMV) zygomatic arches use?

Answer 2

Suspended respiration

Question 3

What SID is used for a submentovertical (SMV) zygomatic arches use?

Answer 3

40” bucky

Question 4

How is the patient positioned for a submentovertical (SMV) zygomatic arches use?

Answer 4

• Patient is seated upright (may be done supine but is harder for patient)
• Flex head back to place IOML parallel to IR

Question 5

Where is the MSP for a submentovertical (SMV) zygomatic arches use?

Answer 5

Perpendicular to IR

Question 6

Where is the CR for a submentovertical (SMV) zygomatic arches use?

Answer 6

• Perpendicular to IOML
• Entering at MSP
• 1” posterior to outer canthi

Question 7

What are the structures seen for a submentovertical (SMV) zygomatic arches use?

Answer 7

• Symmetrical bilateral zygomatic arches or “jug handles”
• No rotation of head
• If one side is not visualized, perform Tangential Projection

Question 8

What are jug handles?

Answer 8

Zygomatic arches

Question 9

What are the zygomatic arches also referred to as?

Answer 9

Jug handles

Question 10

What IR is used for an AP axial (modified towne method) zygomatic arches?

Answer 10

10x12 portrait

Question 11

What SID is used for an AP axial (modified towne method) zygomatic arches?

Answer 11

40” bucky

Question 12

How many degrees is the CR angle for an AP axial (modified towne method) zygomatic arches?

Answer 12

30 caudal (37 caudal when using IOML)

Question 13

Where is the CR for an AP axial (modified towne method) zygomatic arches?

Answer 13

Enters the glabella

Question 14

How is the patient positioned for an AP axial (modified towne method) zygomatic arches?

Answer 14

Supine

Question 15

Where is the MSP & OML for an AP axial (modified towne method) zygomatic arches?

Answer 15

Perpendicular to IR

Question 16

What breathing technique is used for an AP axial (modified towne method) zygomatic arches?

Answer 16

Suspended respiration

Question 17

What are the structures seen for an AP axial (modified towne method) zygomatic arches?

Answer 17

• No overlap of zygomatic arches by mandible
• Symmetric zygomatic arches (no rotation)
• Zygomatic arches projected lateral to mandibular rami

Question 18

What IR is used for a right/left lateral zygoamtic arch view?

Answer 18

10x12 portrait

Question 19

What SID is used for a right/left lateral zygoamtic arch view?

Answer 19

40” bucky

Question 20

How is the patient positioned for a right/left lateral zygoamtic arch view?

Answer 20

• Patient is prone/upright in RAO/LAO
• Head in true lateral

Question 21

Where is the MSP for a right/left lateral zygoamtic arch view?

Answer 21

Parallel to IR

Question 22

Where is the IP line and IOML for a right/left lateral zygoamtic arch view?

Answer 22

Perpendicular to IR

Question 23

Where is the CR for a right/left lateral zygomatic arch view?

Answer 23

• Enters lateral surface of zygomatic bone
• Halfway between outer canthus & EAM

Question 24

What breathing technique is used for a right/left lateral zygomatic arch view?

Answer 24

Suspended respiration

Question 25

What are the structures seen for a right/left lateral zygomatic arch view?

Answer 25

- Zygomatic bone in the center of the image - Almost perfectly superimposed mandibular rami - Superimposed orbital roofs - No rotation of sella turcica

Question 26

What IR is used for a parietoacanthial (waters method) zygomatic arch view?

Answer 26

10x12 portrait

Question 27

What is the SID for a parietoacanthial (waters method) zygomatic arch view?

Answer 27

40" bucky

Question 28

How is the patient positioned for a parietoacanthial (waters method) zygomatic arch view?

Answer 28

- Patient is prone or PA - Chin on bucky/table - Nose will be 3/4" from bucky/table

Question 29

Where is the MSP & MML for a parietoacanthial (waters method) zygomatic arch view?

Answer 29

Perpendicular to IR

Question 30

Where is the OML for a parietoacanthial (waters method) zygomatic arch view?

Answer 30

37- degrees from plane of IR

Question 31

Where is the CR for a parietoacanthial (waters method) zygomatic arch view?

Answer 31

Exits acanthion

Question 32

What breathing technique is used for a parietoacanthial (waters method) zygomatic arch view?

Answer 32

Suspended respiration

Question 33

What are the structures seen for a parietoacanthial (waters method) zygomatic arch view?

Answer 33

- Distance between the lateral border of skull and orbit equal on each side - Petrous ridges below maxillary sinuses - Demonstrates the maxillae, orbits, and zygomatic arches

Question 34

What IR is used for the Axial Oblique (tangential projection) zygomatic arch view?

Answer 34

10x12 portrait

Question 35

What SID is used for the Axial Oblique (tangential projection) zygomatic arch view?

Answer 35

40" bucky

Question 36

What breathing technique is used for the Axial Oblique (tangential projection) zygomatic arch view?

Answer 36

Suspended respiration

Question 37

How is the patient positioned for the Axial Oblique (tangential projection) zygomatic arch view?

Answer 37

- Patient is seated upright - Flex head back to place IOML parallel to IR - Rotate MSP 15-degrees towards affect side - Tilt top of head 15-degrees from affected side

Question 38

Where is the CR for the Axial Oblique (tangential projection) zygomatic arch view?

Answer 38

- Perpendicular to IOML - Centered to zygomatic arch at a point 1" posterior to outer canthus

Question 39

What are the structures seen for the Axial Oblique (tangential projection) zygomatic arch view?

Answer 39

Zygomatic arch free from overlying structures