Skull, Facial, Sinuses, etc.

Question 1

Parietoacanthial Skull

Answer 1

• Waters Method: 85 @ 8
• OML forms 37 degree angle with IR
• MML is nearly perp. to IR
• CR exits at the acanthion
• Image shows:
• *Petrous Ridges immediately below Maxillary Sinuses
• orbits, maxillae, and zygomatic arches

Question 2

AP Axial Skull

Answer 2

• Towne Method: 85 @ 10
• OML perp. with IR
• CR with 30 degree caudal angle (37 if IOML is perp)
• center 2.5” superior to glabella
• Image Shows:
• symmetric petrous ridges
• dorsum sellae posterior to posterior clinoid processes

Question 3

PA Axial Skull

Answer 3

Caldwell Method: 85 @ 7

• OML perp. to IR
• CR is angled 15 degrees caudad entering the nasion
• Image Shows:
• petrous ridges in lower 1/3 of orbits
• symm. petrous ridges

Question 4

Lateral Skull

Answer 4

• technique 85 @ 3
• Pt in anterior oblique position
• IOML perp. to IR
• CR centered at 2” above EAM
• Image Shows:
• Sella turcica in profile
• superimposition of: orbital roofs, TMJs, and mastoid processes

Question 5

Submentovertical Skull

Answer 5

• technique: 85 @ 14
• IOML parallel with IR
• CR enters between mandibular angles 3/4” above EAM
• Image Shows:
• foramina ovale and spinosum
• equidistant mandibular condyles and petrosae
• mental protuberance superimp. over frontal bone