颅内血管壁成像中MSDE序列的参数优化研究  

Scanning parameters optimization of MSDE sequence for intracranial vascular wall imaging

作　　者：李希茂 陶黎[1] 蔡焰 龚启慧 吕发金[1] LI Ximao;TAO Li;CAI Yan;GONG Qihui;LYU Fajin(Department of Radiology,the First Affiliated Hospital of Chongqing Medical University,Chongqing 400016,China)

机构地区：[1]重庆医科大学附属第一医院放射科,重庆400016

出　　处：《磁共振成像》2022年第7期112-115,125,共5页Chinese Journal of Magnetic Resonance Imaging

摘　　要：目的探讨优化参数后的运动敏感驱动平衡(motion-sensitized driven-equilibrium,MSDE)序列对颅内血管壁成像质量的影响。材料与方法随机选取65名受检者采用优化前、后MSDE序列进行头颅MR扫描,主观评估优化前后整体图像质量和主要颅内动脉节段的管腔管壁成像质量,并客观测量脑白质、脑灰质、脑脊液的信噪比(signal to noise ratio,SNR)和对比噪声比(contrast to noise ratio,CNR),比较优化前后两组图像的差异。结果参数优化后MSDE序列扫描时间由4 min 4 s缩短至2 min 29 s。优化后脑白质、脑灰质和脑脊液的SNR及CNR值均高于优化前,差异均有统计学意义(P<0.05)。整体图像质量、右侧椎动脉V4段、基底动脉、右侧颈内动脉C1段、双侧颈内动脉C4段、双侧大脑后动脉P2段的管腔管壁优化后图像质量优于优化前,其差异具有统计学意义(P<0.05)。结论参数优化后的MSDE序列能明显缩短扫描时间,提升图像质量,清晰显示颅内血管壁,满足诊断要求。Objective:To investigate the effect of motion-sensitized driven-equilibrium(MSDE)sequence on the image quality of intracranial vessel wall magnetic resonance imaging.Materials and Methods:Sixty-five subjects were randomly selected for brain MRI using MSDE sequence before and after optimization.The overall image,lumen and wall image quality of main intracranial artery segments were evaluated subjectively,and the signal to noise ratio(SNR)and contrast to noise ratio(CNR)of white matter,gray matter and cerebrospinal fluid were measured objectively before and after optimization.The differences between the two groups of images before and after optimization were compared.Results:The scanning time of MSDE sequence is shortened from 4 min 4 s to 2 min 29 s after parameter optimization.SNR and CNR values of white matter,gray matter and cerebrospinal fluid after optimization were higher than those before optimization with significant differences(P<0.05).Overall image quality,right vertebral artery V4 segment,basilar artery,right internal carotid artery C1 segment,bilateral internal carotid artery C4 segment,bilateral posterior cerebral artery P2 segment after optimization was better than that before optimization with significant difference(P<0.05).Conclusions:The MSDE sequence with optimized parameters can significantly shorten the scanning time,improve the image quality and clearly display the intracranial vascular wall,which meets the diagnostic requirements.

关 键 词：磁共振成像 运动敏感驱动平衡 参数优化 颅内血管壁 黑血成像 图像质量 

分 类 号：R445.2[医药卫生—影像医学与核医学] R743[医药卫生—诊断学]