Application value of of MSCT imaging reconstruc tion technique in SOF and IOF fracture

SHAO Juwei; YANG Yaying; XIANG Shutain; SU Wei

Abstract：[Ab tsract] Objective To explore the value of imaging reconstruction techniques of multi -slice spiral CT(MSCT) in Superior orbital fissure ( SOF) and Inferior orbital fissure ( IOF) fracture.Methods 470 cases clinically diagnosed as the orbital injuries underwent CT plain scan .The data were processed with multiple Multiplanar reconstruction ( MPR) , volume rendering technique ( VRT) and then retrospectively reviewed .Results The direct CT signs of OC fractures included continuous interruption of bone cortex, and displacement of fragments .The indirect signs included thickening mucous membrane of paranasal sinus in 41 cases, localized hematoma of mucous membrane in 11 cases, effusion of paranasal sinus in 59 cases, teardrop sign of IOF in 24 cases, and small vacuole sign in 2cases.In 98 cases with SOF fracture, the detection rate of axial view, axial view with MPR and axial view with VRT reconstruction technique were 86.7%, 100%, and 97.9% (χ2/P axial*axial +MPR-13.923/0.000, χ2 /P axial*axial +VRT-8.735/0.003) respectively;the difference was statistically significant .In 59 cases with IOF fracture, the detection rate of axial view, axial view with MPR and axial view with VRT reconstruction technique were 81.4%, 100% and 94.9%, (χ2/P axial*axial+MPR-12.131/0.000,χ2/P axial*axial+VRT-5.187/0.023) respectively ; the difference was statistically significant. Conclusion MSCT scan and MPR , VRT reconstruction can definite anatomic forma and provide a more accurate understanding of the scope , degree and type of SOF and IOF fracture .HRCT axial view in combination with MPR has the best detection rate . Application of multiple techniques can provide a reliable imaging basis for clinical diagnosis and treatment .