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AP CSP erect vs. supine Beam Angle
erect: 20 cephalic
supine: 15 cephalic

BTP?
good

BTP?
insufficient

BTP?
excessive
Types of Dens Fractures
Type I: if they avulse the tip
Type II: if they occur at the base (unstable)
Type III: if they extend through the body of the axis (unstable)
Head Rotation for Dens
rotation towards side with greater distance between dens and lateral mass
eg. rotation towards the right side

Spine Rotation for Dens
rotation towards opposite side of SP
eg. rotation towards the right side


Head Tilt and C1 Appearance on LAT CSP
SI of C1 Arch (+separation of Z-joints, cranial cortices, etc) = tilt away from bucky
Separation of C1 Arch = tilt towards bucky

OBL?
less than 45

OBL?
more than 45
Forward Bending and BTP for OBL CSP
for both PA and AP OBLs, if forward bending has occured, add an additional 15-20 degrees to the applied BA