Purpose: To clarify the reason for performing osteopathic manipulation for dislocation of a spinal fracture in the angiography suite with cone- beam CT (CBCT). Methods: 1) Clinical review: Twenty-six patients, who received osteopathic manipulation in the angiography suite, were included in this study. The number of cases, diagnosed as an inadequate reduction by CBCT, was reviewed retrospectively. 2) Secondary observations: In addition, CBCT and conventional X-ray CT images of coil embolization artifacts were compared.3) Tertiary dosimetry: with Phantom, CBCT and conventional X-ray CT doses were compared. Results: 1) Four cases were diagnosed as inadequate reduction by the CBCT. Among the cases, three were lower C-spines. 2) Coil embolization artifact was less in CBCT than in. 3) About dose in Center of Phantom, CBCT and conventional X-ray CT was almost the same. Discussion: CBCT was capable of more accurate evaluation in the lower C-spines than fluoroscopy and X-ray CT because of less artifact.