Nakayama Tomohiro, Nishie Akihiro, Yoshiura Takashi, Asayama Yoshiki, Ishigami Kousei, Kakihara Daisuke, Obara Makoto, Honda Hiroshi
Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3-1-1, Maidashi Higashi-ku, Fukuoka, 812-8582, Japan.
Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3-1-1, Maidashi Higashi-ku, Fukuoka, 812-8582, Japan.
Magn Reson Imaging. 2015 Dec;33(10):1219-1223. doi: 10.1016/j.mri.2015.07.003. Epub 2015 Jul 31.
To show the feasibility of motion-sensitized driven-equilibrium-balanced magnetic resonance cholangiopancreatography and to determine the optimal velocity encoding (VENC) value.
Sixteen healthy volunteers underwent MRI study using a 1.5-T clinical unit and a 32-channel body array coil. For each volunteer, images were obtained using the following seven respiratory-triggered sequences: (1) balanced magnetic resonance cholangiopancreatography without motion-sensitized driven-equilibrium, and (2)-(7) balanced magnetic resonance cholangiopancreatography with motion-sensitized driven-equilibrium, with VENC=1, 3, 5, 7, 9 and ∞cm/s for the x-, y-, and z-directions, respectively. Quantitative evaluation was obtained by measuring the maximum signal intensity of the common hepatic duct, portal vein, liver tissue including visible peripheral vessels, and liver tissue excluding visible peripheral vessels that were evaluated. We compared the contrast ratios of portal vein/common hepatic duct, liver tissue including visible peripheral vessels/common hepatic duct and liver tissue excluding visible peripheral vessels/common hepatic duct among the five finite sequences (VENC=1, 3, 5, 7, and 9cm/s). Statistical comparisons were performed using the t-test for paired data with the Bonferroni correction.
Suppression of blood vessel signals was achieved with motion-sensitized driven-equilibrium sequences. We found the optimal VENC values to be either 3 or 5cm/s with the best suppression of relative vessel signals to bile ducts. At a lower VENC value (1cm/s), the bile duct signal was reduced, presumably due to minimal biliary flow.
The feasibility of motion-sensitized driven-equilibrium-balanced magnetic resonance cholangiopancreatography was suggested. The optimal VENC value was considered to be either 3 or 5cm/s. The clinical usefulness of this new magnetic resonance cholangiopancreatography sequence needs to be verified by further studies.
展示运动敏感驱动平衡磁共振胰胆管造影的可行性，并确定最佳流速编码（VENC）值。
16名健康志愿者使用1.5T临床磁共振成像设备及32通道体部阵列线圈进行MRI检查。对每位志愿者，使用以下七种呼吸触发序列获取图像：（1）无运动敏感驱动平衡的平衡磁共振胰胆管造影，以及（2）-（7）有运动敏感驱动平衡的平衡磁共振胰胆管造影，x、y和z方向的VENC分别为1、3、5、7、9和∞cm/s。通过测量肝总管、门静脉、包括可见外周血管的肝组织以及评估的不包括可见外周血管的肝组织的最大信号强度进行定量评估。我们比较了五个有限VENC序列（VENC = 1、3、5、7和9cm/s）之间门静脉/肝总管、包括可见外周血管的肝组织/肝总管以及不包括可见外周血管的肝组织/肝总管的对比率。采用配对数据的t检验并进行Bonferroni校正进行统计学比较。
运动敏感驱动平衡序列实现了血管信号的抑制。我们发现最佳VENC值为3或5cm/s时，对胆管的相对血管信号抑制效果最佳。在较低的VENC值（1cm/s）时，胆管信号降低，可能是由于胆汁流动极小。
提示了运动敏感驱动平衡磁共振胰胆管造影的可行性。最佳VENC值被认为是3或5cm/s。这种新的磁共振胰胆管造影序列的临床实用性需要进一步研究来验证。
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