Table 3.

Cost analysis of ISO-C CT

Cost-effectiveness criteria	Cost/patients
Cost of purchasing ISO-C CT scanner	$300,000
Cost of one use of ISO-C CT scanner	$0
Cost of postoperative CT scan	$650
Cost of revision spine surgery	$39,643
Number of revision patients necessary to equal cost of ISO-C CT scanner	8 patients
Number of patients receiving posterior cervical instrumentation and fusion necessary to justify ISO-C CT cost	100 patients
Number of patients receiving posterior cervical instrumentation and fusion necessary to justify ISO-C CT cost (specific to type of instrumentation)
Lateral mass screws only	229 patients
Pedicle screws only	167 patients
Pars screws only	40 patients