基于小视野及饱和带分段读出平面回波成像对眼眶弥散加权成像图像质量的影响  

Impact of readout-segmented echo-planar imaging based on small field of view and saturation band on image quality of orbital diffusion weighted imaging

作　　者：石海 张久楼 王建伟[1] 曲菲菲 胡昊[1] 徐露露[1] SHI Hai;ZHANG Jiulou;WANG Jianwei;QU Feifei;HU Hao;XU Lulu(Department of Radiology,the First Affiliated Hospital of Nanjing Medical University,Nanjing 210029,China;MR Collaboration,Siemens Healthineers Ltd.,Shanghai 200126,China)

机构地区：[1]南京医科大学第一附属医院放射科,江苏南京210029 [2]上海西门子医疗系统有限公司磁共振科研合作部,上海200126

出　　处：《中国医学影像技术》2023年第12期1872-1876,共5页Chinese Journal of Medical Imaging Technology

基　　金：国家自然科学基金(81801659)。

摘　　要：目的观察基于小视野及饱和带分段读出平面回波成像(RS-EPI)对眼眶弥散加权成像(DWI)图像质量的影响。方法前瞻性对33名健康体健者行MR眼眶扫描,采集T1WI、RS-EPI及优化RS-EPI(基于小视野及饱和带)。以5分法对RS-EPI及优化RS-EPI显示眶内结构(眼球、视神经及肌锥内区)及眶周结构(鼻腔、眶回、视交叉、垂体及颞叶)效果进行主观评价;比较眼球几何参数、信噪比(SNR)及表观弥散系数(ADC)在2种图像中的差异。结果优化RS-EPI显示眼球、鼻腔、眶回、视交叉、垂体及颞叶效果均优于RS-EPI(P均<0.01);2种图像显示视神经及肌锥内区效果差异均无统计学意义(P均>0.05)。左、右眼眼球体积、球形度、曲面面积、3D最大径、轴位最大径及矢状位最大径在优化RS-EPI中的形变均低于RS-EPI(P均<0.01),但冠状位最大径在2种图像中的形变差异无统计学意义(P>0.05)。优化RS-EPI所示左侧颞叶脑白质SNR及玻璃体处ADC均低于RS-EPI(P均<0.01),左侧颞叶脑白质及脑桥处ADC在2种图像中差异均无统计学意义(P均>0.05)。结论以小视野及饱和带优化RS-EPI可提高眼眶DWI成像质量。Objective To observe the impact of readout-segmented echo-planar imaging(RS-EPI)based on small field of view(FOV)and saturation band on image quality of orbital diffusion weighted imaging(DWI).Methods Orbital MR scanning were prospectively performed in 33 healthy subjects.T1W,RS-RPI and optimized RS-EPI(based on small FOV and saturation band)images were acquired.Imaging quality of RS-EPI and optimized RS-EPI on displaying intraorbital structures(eyeballs,optic nerve and intraconal compartment)and periorbital structures(nasal cavity,orbital gyrus,optic chiasma,pituitary and temporal lobe)were evaluated subjectively using 5-point method.The geometric parameters of eyeball,signal-to-noise ratio(SNR)and apparent diffusion coefficient(ADC)were compared between images of RS-EPI and optimized RS-EPI.Results The display of eyeball,nasal cavity,orbital gyrus,optic chiasm,pituitary and temporal lobe on optimized RS-EPI were all better than those on RS-EPI(all P<0.01),whereas no significant difference of optic nerve nor intraconal compartment was found between optimized RS-EPI and RS-EPI images(P>0.05).Deformations of eyeball volume,sphericity,surface area,3D maximum diameter,axial maximum diameter and sagittal maximum diameter of bilateral eyes on optimized RS-EPI images were all slighter than those on RS-EPI(all P<0.01),whereas no significant difference of deformations of coronal maximum diameters was found between optimized RS-EPI and RS-EPI images(P>0.05).SNR of left temporal lobe white matter and ADC of vitreous body on optimized RS-EPI images were both lower than those on RS-EPI(both P<0.01),whereas no significant difference of ADC of left temporal lobe white matter nor that of pons was found between optimized RS-EPI and RS-EPI images(P>0.05).Conclusion Optimized RS-EPI with small FOV and saturation band could be used to improve imaging quality of orbital DWI.

关 键 词：眼眶 磁共振成像 前瞻性研究 图像质量 

分 类 号：R770.4[医药卫生—眼科] R445.2[医药卫生—临床医学]