Yoon Jeong Hee, Lee Jeong Min, Yu Mi Hye, Kim Eun Ju, Han Joon Koo, Choi Byung Ihn
Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, Seoul, 110-744, Korea.
Abdom Imaging. 2014 Aug;39(4):711-21. doi: 10.1007/s00261-014-0099-8.
To determine whether application of a high-acceleration parallel acquisition can provide three-dimensional (3D)-fat-suppressed T1-weighted gradient-recalled-echo (T1W-GRE) imaging at 3T for liver MR imaging.
This retrospective study was approved by our institutional review board. Seventy patients underwent liver MRI at a 3T scanner. After administration of a standard dose of Gadoxetic acid for 20 min, 3D-T1W-GRE images were obtained twice using sensitivity encoding with acceleration factors (AFs) 2.6 [332 × 298 matrix, 3-mm slice thickness (ST)] and 4 (380 × 320 matrix, 1.5-mm ST). The image qualities of the two image sets were graded using a five-point scale.
The high-resolution (HR) 3D-T1W-GRE image sets were obtained with an AF 4 within a single breath-hold (18.5 s). It showed a better anatomic depiction than conventional 3D-T1W-GRE image sets with an AF 2.6 (p < 0.05). Although the image noise was higher on the HR image sets (p < 0.05), the HR image sets showed better lesion conspicuity and overall image quality than the conventional image sets (p < 0.05).
With the use of high AFs, HR 3D-T1W-GRE imaging was demonstrated to be clinically more feasible and advantageous than the conventional 3D-T1W-GRE.
确定高加速并行采集技术能否在3T磁共振成像系统上实现肝脏三维（3D）脂肪抑制T1加权梯度回波（T1W - GRE）成像。
本回顾性研究经机构审查委员会批准。70例患者在3T扫描仪上进行肝脏磁共振成像检查。静脉注射标准剂量的钆塞酸二钠20分钟后，采用敏感度编码技术分别以加速因子（AF）2.6 [332×298矩阵，3毫米层厚（ST）]和4（380×320矩阵，1.5毫米ST）两次采集3D - T1W - GRE图像。两组图像质量采用五分制进行评分。
采用AF 4在一次屏气（18.5秒）内获得了高分辨率（HR）3D - T1W - GRE图像集。与AF为2.6的传统3D - T1W - GRE图像集相比，其解剖结构显示更佳（p < 0.05）。尽管HR图像集的图像噪声更高（p < 0.05），但与传统图像集相比，HR图像集对病变的显示及整体图像质量更佳（p < 0.05）。
使用高加速因子时，HR 3D - T1W - GRE成像在临床上比传统3D - T1W - GRE成像更可行且更具优势。
