| PART ITITLE: CT Measurement of the Spatial Relationship between Aorta and Neighboring Vertebral Body in Scoliosis and its Clinical Application. Purpose: to investigate the spatial relationship between the vertebral body and the thoracic aorta in patients with scoliosis by means of Measuring, contrasting and anglicizing the CT scanning of the patients with idiopathic scoliosis and without spinal deformity, and to provide a security evaluation of anterior instrumentation surgery.Materials and Method: (1)The axial images from the T4 to T12 at the midvertebral body level of the 32 patients with idiopathic scoliosis and 66 patients without spinal deformity were used to measure and contrast the parameters, including the Aorta-vertebral angle (B) composed of the line between the axial line (x)of the vertebral body and the line (s)from the anterior midpoint of the vertebral canal to the midpoint of the aorta, the distance (g) from the most posterior aspect of the aorta to the line (z) passed the anterior edge of the bilateral rib heads. The vertebral rotation angles (R) of patients with scoliosis were measured, too.(2)32 patients with thoracic scoliosis were examined. On CT axial images from T4 to T12, line / was drawn through the anterior edge of the bilateral rib heads, line m was drawn tangent the posterior edge of the aorta and passing through the intersection of the right edge of the vertebral body and line l. The angle A between line l and line m was measured for evaluation. If A<0, whichmeans that line l has passed through the aorta, the distance d between the aorta and vertebral body along line l were measured. Both A and d were used as the parameters for evaluating the safety of surgical correction of scoliosis with anterior approach.Results: (1)The angle B of the two groups had a tendency of increasing firstly and then diminishing, but was larger in scoliosis group than in control group .and the difference from T5 to T10 of the two groups had prominent statistical significant, g value of both groups had a tendency of diminishing firstly and then increasing, but was smaller in scoliosis group than in control group, while the difference was prominent from T8 to T10.(2)as for the separated measurements of the 32 patients with thoracic scoliosis, When A>0, the spatial relationship between the vertebrae and aorta was defined as " safe" (211, 74.6%). When A<0 and fif>2mm, it was defined as "suspicious"(45,15.9%). When A<0, d<2mm, it was defined as "dangerous"(27,9.5%).Conclusion: In patient with scoliosis, the aorta is positioned more laterally and posteriorly relative to the vertebral body compared with that in patients without spinal deformity. CT Measurement can accurately describe the spatial relationship between the vertebral body and the thoracic aorta in idiopathic scoliosis and provide reference for precise and safe screw placement to prevent the adjacent aorta from damage in the surgical correction of scoliosis with anterior approach.PART IITITLE: Study on the Clinical Application of the Imaging Technique Combined Spiral CT 3D-reconstruction with CTA for the Correction Operation of Scoliosis Purpose: To evaluate the clinical applications of imaging technique combined spiral CT 3D-reconstruction with CTA for the correction operation of scoliosis. Materials and Method: 12 patients with scoliosis had been performed both plain and enhanced CT scanning .Using SCTA and 3D reconstructions combined technique to reconstruct the imaging of the correlative part of the correction... |
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