The diagnosis of orbital tumor with dynamic contrast-enhanced MRI / 中华放射学杂志

ABSTRACT

Objective To improve the diagnostic value of MRI on orbital diseases,especially on benign and malignant tumors,through analyzing the characteristics of orbital diseases with dynamic contrast-enhanced MRI.Methods Forty-one patients with solitary orbital masses, including 31 benign tumors and 10 malignant tumors,underwent MR examinations. All the cases were verified by pathology.1.5 T MR system and head coil were employed.Conventional scan was performed with axial,sagittal,and coronal T_1WI,as well as axial T_2WI and the slice thickness of 4 mm.After the injection of contrast agents,dynamic contrast-enhanced MRI was immediately performed so as to observe dynamic changes of lesions.Enhancement rates(E%) was calculated and time-intensity curve was portraited according to the signal intensity of conventional scan and dynamic-contrast enhanced scan.SPASS Ver10.0 was used to do the statistical analysis,while cartographies were completed with Powerpoint.Results(1)Comparision between benign and malignant tumors in average enhanced rates of the 1~(st) minute it was higher than 60% in malignant tumors,while lower than 60% in benign ones(P