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目的 评价高分辨黑血磁共振成像技术(BB-MRI)对蛛网膜颗粒定量评价的准确性.方法 前瞻性纳入经时间飞跃法磁共振静脉造影(TOF-MRV)诊断存在蛛网膜颗粒的25名患者,进行BB-MRI扫描.对于每个测量对象(蛛网膜颗粒),在TOF-MRV图像上选取蛛网膜颗粒最大层面,将BB-MRI图像与之进行配准,获得重建图像.由两名有经验的放射科医师分别对TOF-MRV和BB-MRI图像上蛛网膜颗粒最大径线和最大截面积行双盲测定,比较两种方法测量指标的差异.结果 在25名患者中,TOF-MRV共发现26个蛛网膜颗粒,BB-MRI方法均能正确检出.TOF-MRV和BB-MRI测定的蛛网膜颗粒最大径线平均值分别为(7.1±2.2) mm和(7.2±2.1) mm(P＞0.05),最大截面积平均值分别为(25.3±8.8) mm2和(25.4±8.8) mm2(P＞0.05).Bland-Altman分析显示蛛网膜颗粒最大径线、最大截面积的测量,两种方法具有良好的一致性.结论 TOF-MRV和BB-MRI技术均能无创性直观显示蛛网膜颗粒,可用于蛛网膜颗粒和静脉窦相关疾病的临床鉴别诊断.“,”Objective To explore the value of high resolution black blood magnetic resonance imaging(BBMRI) in the quantitative evaluation of arachnoid granulations.Methods 25 cases of patients with arachnoid granulations confirmed by time of flight magnetic resonance venography(TOF-MRV) were prospectively enrolled.For each arachnoid granule,two experienced radiologists were selected to determine the maximum diameter and cross-sectional area by reconstructed TOF-MRV and BB-MRI images blindly.Results A total of 25 patients were recruited and 26 arachnoid granules were found by TOF-MRV and confirmed by BB-MRI further.The maximal diameter of the arachnoid granules measured by TOF-MRV and BB-MRI was (7.1 ± 2.2)mm and (7.2 ± 2.1)mm respectively,and the maximum cross-sectional area was (25.3 ± 8.8)mm2 and (25.4 ± 8.8)mm2,respectively(P＞0.05).The Bland-Altman analysis showed that the maximum diameter and maximum cross-sectional area by TOF-MRV and BB-MRI were well consistent.Conclusion TOF-MRV and BB-MRI can noninvasively depict arachnoid granule in the venous sinus,would be useful for the diagnosis and differential diagnosis of the diseases.