Diagnostic Value of the Unilateral Axial CT Multiplanar Reformation in Large Vestibular Aqueduct

Objective To explore the value of unilateral axial CT multiplanar reformation in measuring the large vestibular aqueduct.Materials and Methods Eighteen cases including thirty five ears undwent MSCT sanning of the temporal bones.The MPR images of the full long limbs demonstrated bilaterally and unilaterally were obtained from the original data.The vestibular aqueduct midpoint widths showed on bilateral and unilateral MPR images were analyzed statistically.Results The widths measured on unilateral axial MPR were equal or bigger than that on bilateral axial MPR.The results of bilateral and unilateral MPR were equal in 6 ears.The subtraction between bilateral and unilateral MPR was 0.1mm in 4 ears,0.2 mm in 13 ears,and bigger than 0.3 mm in 12 cases.There was statistically significant difference between bilateral and unilateral MPR(P0.01).Conclusion The unilateral axial MPR image is better in diagnosis of large vestibular aqueduct malformation.