Supine or erect, spine centered to CR and centerline of table 

bend laterally as far as possible without tilting pelvis 

ensure no rotation of pelvis and upper torso 

lowe margin of IR 1-2 inches below iliac crest 

CR perpendicular to center of IR 

102-153 cm

include vertebral column of interest 

Expose at end of expiration

size: 35 x 43 cm 

lengthwise 

grid

compensating filters to produce a more uniform density of spine 

kVp : 70-80 

mAs : 60-80