Which Factor Is Most Important to Open Up the Intervertebral

Multiple Choice

Which factor is most important to open up the intervertebral joint spaces for a lateral thoracic spine projection?

A) Use sufficiently high kV.
B) Collimate the spine region to reduce scatter.
C) Keep the vertebral column parallel to the tabletop.
D) Angle the central ray (CR) 5° to 10° caudad.