Graves Martin J, Kershaw Lucy E, Black Richard T, Sala Evis, Skinner Jane, Lomas David J
Department of Radiology, University of Cambridge Hospitals NHS Foundation Trust, Cambridge, United Kingdom.
J Magn Reson Imaging. 2006 Apr;23(4):529-33. doi: 10.1002/jmri.20538.
To implement and evaluate a technique for adaptively averaging 2D magnetic resonance cholangiography (MRC) images obtained using an interactive imaging system with a view to improving image quality at reduced fields of view (FOVs).
Images were obtained using an interactive implementation of a single-shot half-Fourier rapid acquisition with relaxation enhancement (RARE) technique. Software was developed for adaptively averaging images, and an evaluation was performed in a phantom and a cohort of 10 patients referred for standard MRC. Adaptively averaged and standard single-shot MRC images were evaluated with respect to their ability to demonstrate the common bile duct and main left and right intrahepatic duct branches.
In all patient studies there was no difference in the ability of either the adaptive technique or the standard single-shot method to demonstrate the common bile duct and the main left and right intrahepatic duct branches. However, in seven of the 10 patient studies the adaptive technique provided better visualization of the peripheral bile duct system (P = 0.035; sign test). There was no difference in the diagnostic confidence of the two techniques (P = 0.32, Wilcoxon signed-rank test).
Adaptive averaging of MRC images obtained using an interactive imaging paradigm significantly improves visualization of peripheral intrahepatic ducts.
应用并评估一种用于对使用交互式成像系统获得的二维磁共振胆管造影（MRC）图像进行自适应平均的技术，以在减小视野（FOV）的情况下提高图像质量。
使用单次激发半傅里叶快速采集弛豫增强（RARE）技术的交互式实现方式获取图像。开发了用于对图像进行自适应平均的软件，并在体模和10例接受标准MRC检查的患者队列中进行了评估。对自适应平均的和标准单次激发MRC图像显示胆总管及左右肝内主要胆管分支的能力进行了评估。
在所有患者研究中，自适应技术和标准单次激发方法显示胆总管及左右肝内主要胆管分支的能力没有差异。然而，在10例患者研究中的7例中，自适应技术能更好地显示外周胆管系统（P = 0.035；符号检验）。两种技术的诊断置信度没有差异（P = 0.32，Wilcoxon符号秩检验）。
使用交互式成像模式对MRC图像进行自适应平均可显著改善外周肝内胆管的可视化。
