Lab Practical Final

Question 1

Lateral Position: R/L Lateral–Facial Bones

Answer 1

kVp 70-85
MSP parallel to IR
IPL perpendicular to IR
IOML perpendicular to front edge of IR
CR perpendicular to zygoma, midway between outer canthus and EAM

Question 2

Parietoacanthial Projection–Facial Bones: Waters Method

Answer 2

kVp 70-85
MML perpendicular to plane of IR
MSP perpendicular to midline of grid
CR perpendicular to exit at acanthion

Question 3

PA Axial Projection–Facial Bones: Caldwell Method

Answer 3

kVp 70-85
OML perpendicular to IR
MSP perpendicular to midline of grid
CR 15 degrees caudad, to exit at nasion
*If area of interest is orbital margins, use a 30 degree caudad angle and exit at level of midorbits

Question 4

Modified Parietoacanthial Projection–Facial Bones: Modified Waters Method

Answer 4

kVp 70-85
LML perpendicular to IR
MSP perpendicular to midline of grid
CR perpendicular to exit at acanthion

Question 5

Lateral Position–Nasal Bones

Answer 5

no grid
kVp 65-80
MSP parallel with IR
IPL perpendicular to IR
IOML perpendicular to front edge of IR
CR perpendicular to 1.5 in. inferior to nasion

Question 6

Superoinferior Tangential (Axial) Projection–Nasal Bones

Answer 6

kVp 65-80
GAL perpendicular to IR
MSP perpendicular to CR and to IR midline
CR to nasion and angle as needed to ensure that it is parallel to GAL (CR must just skim glabella and anterior upper front teeth)