Department of Radiology, NYU Langone Medical Center, 660 First Avenue, New York, NY 10016, United States.
Department of Urology, Division of Urologic Oncology, NYU Langone Medical Center, 150 East 32nd Street, Suite 200, New York, NY 10016, United States.
Eur J Radiol. 2014 Mar;83(3):503-8. doi: 10.1016/j.ejrad.2013.11.013. Epub 2013 Dec 4.
To retrospectively compare perceived complexity and Bosniak cyst classification of cystic renal lesions between 1.5 T and 3 T MRI.
33 cystic renal lesions in 26 patients that underwent contrast-enhanced MRI at both 1.5 T and 3 T within a 12 month span were included. Two radiologists (R1, R2) independently assessed lesions, unaware of field strength, in terms of number of septations, septal thickening, mural thickening, presence of mural nodule, and Bosniak cyst category. Scores were compared between field strengths for each lesion.
R1 observed increases in septal number, septal thickening, mural thickening, and presence of mural nodule at 3T in 8, 7, 4, and 2 lesions, and at 1.5 T in 3, 3, 2, and 0 lesions, respectively; R2 observed increases in septal number, septal thickening, mural thickening, and presence of mural nodule at 3T in 3, 4, 3, and 0 lesions, and at 1.5 T in 2, 0, 0, and 0 lesions, respectively. R1 provided higher Bosniak category at 3T in 9 cases and at 1.5 T in 4 cases; R2 provided higher Bosniak category at 3T in 4 cases and at 1.5 T in 0 cases. Higher scores at 3T than 1.5 T were associated with differences in advised clinical management in 7/9 cases for R1 and 4/4 cases for R2.
There was an overall tendency for both readers to upgrade cyst complexity and Bosniak cyst category at 3T than 1.5 T, which impacted advised management. Thus, we suggest that serial MRI evaluation of cystic renal lesions be performed at constant field strength.
回顾性比较 1.5T 和 3T MRI 下囊性肾病变的感知复杂性和 Bosniak 囊肿分类。
纳入 26 例患者的 33 个囊性肾病变，这些病变在 12 个月内分别在 1.5T 和 3T 行增强 MRI 检查。两名放射科医师（R1、R2）独立评估病变，不了解场强，评估内容包括分隔数量、分隔增厚、壁增厚、壁结节存在和 Bosniak 囊肿类别。比较每个病变的场强评分。
R1 在 3T 下观察到 8 个病变的分隔数量、分隔增厚、壁增厚和壁结节存在增加，分别在 7、4 和 2 个病变中观察到增加，在 1.5T 下观察到 3、3、2 和 0 个病变增加；R2 在 3T 下观察到 3 个病变的分隔数量、分隔增厚、壁增厚和壁结节存在增加，分别在 4、3 和 0 个病变中观察到增加，在 1.5T 下观察到 2、0、0 和 0 个病变增加。R1 在 3T 下提供了更高的 Bosniak 类别 9 例，在 1.5T 下提供了更高的 Bosniak 类别 4 例；R2 在 3T 下提供了更高的 Bosniak 类别 4 例，在 1.5T 下提供了更高的 Bosniak 类别 0 例。与建议临床管理差异相关的是，R1 在 3T 下的评分高于 1.5T 下的评分，在 7/9 例中，R2 在 3T 下的评分高于 1.5T 下的评分，在 4/4 例中。
两位读者都普遍倾向于在 3T 下比在 1.5T 下升级囊性病变的复杂性和 Bosniak 囊肿类别，这影响了建议的管理。因此，我们建议对囊性肾病变进行连续 MRI 评估时，应保持场强不变。
