Imaging Study And Anatomic Measurement Of Normal Inner Ear With MR 3D-CISS Sequence

Objective: To study the technical and clinical application of MRI 3D-C1SS sequence in inner ear ,and to establish MRI measurement criterion of inner ear structures. Methods: One hundred and twenty inner ear of 60 healthy volunteers which underwent MRI scaning with 3D constructive interference in steady state (CISS) were separated at random into two groups with different effective slice thickness. All the original images were transferred to an online workstation. The structures of the inner ear were reconstructed by using maximum intensity projection (MIP) and multiplannar reconstruction (MPR). The ability of 3D-CISS sequence to showing and measuring anatomic structures in inner ear was studied . Results: (1) The scan of 3D-CISS combined with post-procession could precisely show labyrinth and vessels in inner ear. (2)There were post-procession-related differences in three semicircular canal height and diameter of upper, lateral semicircular canal ; they were (5.327±0.412)mm(MIP)versus (4.483±0.379) mm(MPR); (4.875±0.534) mm(MIP) versus (5.415±0.396) mm (MPR); (3.653±0.450) mm (MIP) versus (4.066±0.381)mm (MPR); (1.134±0.172) mm (MIP)versus (1.630±0.195) mm (MPR)(1.196±0.204 ) mm;(MIP) versus (1.422±0.184) mm (MPR). There were no post-procession-related differences in diameter of posterior semicircular canal and cochlea ; The diameter of posterior semicircular canal were (1.308±0.214) mm,the external diameter of cochlea basal turn was (6.638±0.375) mm, the diameter of cochlea basal turn was (1.463±0.109)mm .Conclusion: 3D-CISS sequence can...