Orbits, Nasal Bone, Zygomatic Arches

What is the projections for the orbits

Modified waters, lateral, and PA Axial

What is the patient position for the modified waters orbits

seated or prone - chest resting on bucky - OML 50 degrees from IR plane

What is the centering for the modified waters orbits

exit mid orbits

What is the image critique for all orbit projections

shows entire orbit with petrous ridges below orbits - no rotation - symmetric orbitsW

What is the patient positon for lateral orbit

Put patient in anterior oblique - head in lateral position with affected side closest to IRW

What is the centering the lateral orbits

outer canthus

What are the projections for the nasal bone

waters and lateral

What is the patient position for the waters nasal bone projection

prone or seated - chin resting on IR - MSP midline - MML perpendicularW

What is teh centering for waters nasal bone

acanthion

What is the centering for the lateral nasal bone

bridge of nose - 1/2” beyond tip of nose

What is the image critique for lateral nasal bone

incluses nasal bones, anterior nasal spine, and frontonasal suture - no rotation

What are the projections of the zygomatic arch

submentovertical, tangential, waters (PA), AP Axial modified townes method

What is the patient position for the submentovertical zygomatic arch

pull stool away from IR - seated - hyperextend neck - lean back - IOML parallelW

What is the centering for the submentovertical zygomatic arch

perpendicular to IOML - enter throat 1” posterior to outer canthi

What is the image critique for submentovertical

zygomatic arches free from overlying structues - no rotation or tilt - zygomatic arches symmetric and no foreshortening

What is the patient position of the tangential zygomatic arches

seated or upright - AP - rest top of head on IR (bend neck) - pull stool away - IOML parallel - MSP rotated 15 degrees towards affected side (tilt top of head away from affected side 15 degrees)

What is the image critique for the tangential zygomatic arches

zygomatic arch free from overlying structures

What is the patient position for the waters (PA) zygomatic arches

prone or seated PA - chin on IR - hyperextend neck - MML perpendicular

What is the centering for the waters zygomatic arches

exit acantion

What is the image critiuq for the waters zygomatic arches

entire orbits and facial bones - distance bewteen lateral border of skull and orbit equal on each side - MSP centered - petrous ridges immediately below maxillary sinus

What is the CR for the AP Axial modified towne method zygomatic arches

30 degrees caudad - if the neck cant flex=37 degrees caudadW

What is the patient positon for the AP Axial modified towne method zygomatic arches

seated - chin slighlty down - MSP and MML perpendicular

What is the centering for the AP Axial modified towne method zygomatic arches

glabella (1” above nasion)

What is the image critique for the AP Axial modified towne method zygomatic arches

symmetric arches - zygomatic arches projected lateral to mandibular rami - MSP centered