Department of Radiological Science, Cheongju University, Cheongju 28503, Korea.
Department of Health Administration and Healthcare, Cheongju University, Cheongju 28503, Korea.
Tomography. 2022 May 22;8(3):1374-1385. doi: 10.3390/tomography8030111.
This study aimed to select the pulse sequence providing the optimal MRCP image quality by applying various reduction and denoising level parameters—which could improve image quality and shorten examination time—to BH-2D-SSh TSE, RT- 2D-SENSE TSE, and RT-2D-Compressed SENSE(CS) TSE and then comparing and analyzing the obtained images. This study was carried out using 30 subjects (15 men and 15 women with a mean age of 53 ± 8.76 years) who underwent an MRCP test using 3.0T MRI equipment. These 30 subjects were composed of 20 patients (CHDD: 7; LC: 6; and IPMN: 7) and 10 volunteers without a disease. When the CS technique was used, five reduction values (1.1, 1.2, 1.3, 1.4, and 1.5) were used and four denoising levels (No, Weak, Medium, and Strong) were used. The existing SENSE method was based on a reduction value of 1, and other parameters were set the same. The image data of BH-2D-SSh TSE, RT-2D-SENSE TSE, and RT-CS-2D TSE used for the analysis were acquired in the coronal plane, and the acquired data underwent MIP post-processing for analysis. To compare these techniques, SNR and CNR were measured for six biliary duct images for the purpose of quantitative analysis, and qualitative analysis was performed on the sharpness of the duct, the overall quality of the image, and the motion artifact. The results of the quantitative and standard analyses showed that the RT-2D-CS TSE technique had the highest results for all IPMN, LC, and CHDD diseases (p < 0.05). Moreover, SNR and CNR were the highest when the reduction value was set to 1.3 and the denoising level was set to medium as the CS setting values (p < 0.05). Compared with the conventional RT-2D-SENSE TSE, the test time decreased by 20% and SNR and CNR increased by 14% on average. When conducting RT-2D-CS TSE, we found that it shortened the examination time and improved the image quality compared to the existing RT-2D-SENSE TSE. Unlike previous studies, this study using the RT technique shows that it is a useful MRI Pulse Sequence technique able to replace the BH-2D-SSh TSE and BH-3D-SENSE GRASE techniques, which require the patient to hold their breath during the test.
本研究旨在通过应用各种降低和降噪水平参数来选择提供最佳 MRCP 图像质量的脉冲序列——这可以提高图像质量并缩短检查时间——对 BH-2D-SSh TSE、RT-2D-SENSE TSE 和 RT-2D-Compressed SENSE(CS) TSE 进行研究，然后对获得的图像进行比较和分析。这项研究使用了 30 名受试者（15 名男性和 15 名女性，平均年龄为 53±8.76 岁），他们使用 3.0T MRI 设备进行了 MRCP 测试。这 30 名受试者包括 20 名患者（CHDD：7；LC：6；和 IPMN：7）和 10 名无疾病的志愿者。当使用 CS 技术时，使用了五个降低值（1.1、1.2、1.3、1.4 和 1.5）和四个降噪水平（无、弱、中、强）。现有的 SENSE 方法基于 1 的降低值，其他参数设置相同。用于分析的 BH-2D-SSh TSE、RT-2D-SENSE TSE 和 RT-CS-2D TSE 的图像数据是在冠状面采集的，并对采集的数据进行 MIP 后处理进行分析。为了比较这些技术，对六张胆管图像进行了 SNR 和 CNR 的测量，以进行定量分析，并对胆管的清晰度、图像的整体质量和运动伪影进行了定性分析。定量和标准分析的结果表明，RT-2D-CS TSE 技术在所有 IPMN、LC 和 CHDD 疾病中的结果均最高（p<0.05）。此外，当 CS 设置值为降低值 1.3 和降噪水平为中值时，SNR 和 CNR 最高（p<0.05）。与传统的 RT-2D-SENSE TSE 相比，测试时间缩短了 20%，SNR 和 CNR 平均增加了 14%。在进行 RT-2D-CS TSE 时，我们发现与现有的 RT-2D-SENSE TSE 相比，它缩短了检查时间并提高了图像质量。与之前的研究不同，本研究使用 RT 技术表明，它是一种有用的 MRI 脉冲序列技术，可以替代需要患者在测试过程中屏住呼吸的 BH-2D-SSh TSE 和 BH-3D-SENSE GRASE 技术。
