FIG 2.

Constructed cervical phantom model. The photograph shows the fully-constructed phantom model. The cervical spine model is covered with polyalginate. There is a latex tube running through the spinal canal of the cervical model, with an inner latex balloon within the tube. The inner latex balloon is filled with dyed water, and the outer tube is filled with clear water. Two hemostats on either end of the phantom are occluding the posterior third of the latex tube to ensure that the balloon is in a more accurate anatomic position relative to the spinal cord. The hemostat at the distal end of the latex tube is used to maintain water pressure within the latex tube.