Chandarana Hersh, Block Kai T, Winfeld Matthew J, Lala Shailee V, Mazori Daniel, Giuffrida Emalyn, Babb James S, Milla Sarah S
Department of Radiology, New York University Langone Medical Center, 660 First Avenue, New York, NY, 10016, USA,
Eur Radiol. 2014 Feb;24(2):320-6. doi: 10.1007/s00330-013-3026-4. Epub 2013 Sep 25.
To compare the image quality of contrast-enhanced abdominopelvic 3D fat-suppressed T1-weighted gradient-echo imaging with radial and conventional Cartesian k-space acquisition schemes in paediatric patients.
Seventy-three consecutive paediatric patients were imaged at 1.5 T with sequential contrast-enhanced T1-weighted Cartesian (VIBE) and radial gradient echo (GRE) acquisition schemes with matching parameters when possible. Cartesian VIBE was acquired as a breath-hold or as free breathing in patients who could not suspend respiration, followed by free-breathing radial GRE in all patients. Two paediatric radiologists blinded to the acquisition schemes evaluated multiple parameters of image quality on a five-point scale, with higher score indicating a more optimal examination. Lesion presence or absence, conspicuity and edge sharpness were also evaluated. Mixed-model analysis of variance was performed to compare radial GRE and Cartesian VIBE.
Radial GRE had significantly (all P < 0.001) higher scores for overall image quality, hepatic edge sharpness, hepatic vessel clarity and respiratory motion robustness than Cartesian VIBE. More lesions were detected on radial GRE by both readers than on Cartesian VIBE, with significantly higher scores for lesion conspicuity and edge sharpness (all P < 0.001).
Radial GRE has better image quality and lesion conspicuity than conventional Cartesian VIBE in paediatric patients undergoing contrast-enhanced abdominopelvic MRI.
• Numerous techniques are required to provide optimal MR images in paediatric patients. • Radial free-breathing contrast-enhanced acquisition demonstrated excellent image quality. • Image quality and lesion conspicuity were better with radial than Cartesian acquisition. • More lesions were detected on contrast-enhanced radial than on Cartesian acquisition. • Radial GRE can be used for performing abdominopelvic MRI in paediatric patients.
比较在儿科患者中，采用径向和传统笛卡尔k空间采集方案的对比增强腹部盆腔三维脂肪抑制T1加权梯度回波成像的图像质量。
73例连续的儿科患者在1.5T下成像，尽可能采用参数匹配的连续对比增强T1加权笛卡尔（VIBE）和径向梯度回波（GRE）采集方案。笛卡尔VIBE在屏气时采集，对于无法屏气的患者则自由呼吸采集，随后所有患者均进行自由呼吸径向GRE采集。两名对采集方案不知情的儿科放射科医生以五分制评估图像质量的多个参数，分数越高表明检查越理想。还评估了病变的有无、清晰度和边缘锐利度。进行混合模型方差分析以比较径向GRE和笛卡尔VIBE。
与笛卡尔VIBE相比，径向GRE在整体图像质量、肝脏边缘锐利度、肝血管清晰度和呼吸运动稳健性方面的得分显著更高（所有P<0.001）。两位阅片者在径向GRE上检测到的病变均比在笛卡尔VIBE上更多，病变清晰度和边缘锐利度的得分显著更高（所有P<0.001）。
在接受对比增强腹部盆腔MRI的儿科患者中，径向GRE比传统笛卡尔VIBE具有更好的图像质量和病变清晰度。
• 在儿科患者中提供最佳MR图像需要多种技术。• 径向自由呼吸对比增强采集显示出优异的图像质量。• 径向采集的图像质量和病变清晰度优于笛卡尔采集。• 对比增强径向采集比笛卡尔采集检测到更多病变。• 径向GRE可用于儿科患者的腹部盆腔MRI检查。
