Asbach Patrick, Dewey Marc, Klessen Christian, Stemmer Alto, Ockenga Johann, Huppertz Alexander, Sander Bernhard, Hamm Bernd, Taupitz Matthias
Department of Radiology, Charité - Universitätsmedizin Berlin, Berlin, Germany.
J Magn Reson Imaging. 2006 Nov;24(5):1095-100. doi: 10.1002/jmri.20735.
To evaluate the influence of parallel imaging on the image quality of respiratory triggered magnetic resonance cholangiopancreatography (MRCP).
A total of 30 consecutive patients underwent MRCP applying a respiratory triggered T2-weighted (T2w) turbo spin-echo (TSE) sequence without and with parallel imaging (acceleration factor of 2). Acquisition times of both sequences were recorded. Quantitative evaluation included measurement of a contour sharpness index of two segments of the pancreaticobiliary tree as well as calculation of the relative contrast between ductal structures and organ parenchyma at four different segments. The qualitative evaluation was performed by two independent radiologists who graded overall image quality, depiction of eight segments of the pancreaticobiliary tree, and the frequency of artifacts.
The application of parallel imaging significantly (P<0.05) reduced the acquisition time of the respiratory triggered MRCP sequence by 37.7% (six minutes and two seconds+/-one minute and 26 seconds vs. three minutes and 46 seconds+/-58 seconds). The quantitative and qualitative evaluation revealed no statistically significant differences between the two sequences (P>0.05). The frequency of artifacts was at the same level for both sequences as well.
The application of parallel imaging for respiratory triggered MRCP significantly reduces the acquisition time without relevant influence on image quality.
评估并行成像对呼吸触发磁共振胰胆管造影（MRCP）图像质量的影响。
连续30例患者接受MRCP检查，分别采用呼吸触发T2加权（T2w）快速自旋回波（TSE）序列，一次不使用并行成像，另一次使用并行成像（加速因子为2）。记录两个序列的采集时间。定量评估包括测量胰胆管树两个节段的轮廓清晰度指数，以及计算四个不同节段导管结构与器官实质之间的相对对比度。定性评估由两名独立的放射科医生进行，他们对整体图像质量、胰胆管树八个节段的显示情况以及伪影频率进行分级。
并行成像的应用显著（P<0.05）缩短了呼吸触发MRCP序列的采集时间，缩短了37.7%（6分2秒±1分26秒对3分46秒±58秒）。定量和定性评估显示两个序列之间无统计学显著差异（P>0.05）。两个序列的伪影频率也处于同一水平。
并行成像应用于呼吸触发MRCP可显著缩短采集时间，且对图像质量无相关影响。
