Sato Ryota, Shirai Toru, Taniguchi Yo, Murase Takenori, Bito Yoshitaka, Soutome Yoshihisa, Ochi Hisaaki
Research and Development Group, Hitachi Ltd., 1-280, Higashi-Koigakubo, Kokubunji-shi, Tokyo, 185-8601, Japan.
Healthcare Business Unit, Hitachi, Ltd., Ueno East Tower, 2-16-1, Higashi-Ueno, Taito-ku, Tokyo, 110-0015, Japan.
Radiol Phys Technol. 2018 Jun;11(2):255-261. doi: 10.1007/s12194-018-0458-1. Epub 2018 Apr 26.
To realize susceptibility-weighted imaging in vertical-field magnetic resonance imaging (MRI), we developed an image-processing method called "susceptibility difference weighted imaging" (SDWI). In SDWI, contrasts are enhanced using a susceptibility map calculated by using a weighted least-square algorithm with a small iteration number. Experiments were performed on human volunteers to compare image contrast obtained from the conventional method (SWI) and SDWI. In horizontal-field MRI, SDWI results show that veins and deep-gray-matter nuclei were visualized as well as those with SWI. In vertical-field MRI, SDWI visualized veins and deep-gray-matter nuclei without severe streaking artifacts, while SWI did not. In our experiments, the time taken to calculate the susceptibility map in SDWI was less than 10 s. The results indicate that susceptibility-weighted imaging is feasible in vertical-field MRI using SDWI.
为了在垂直场磁共振成像（MRI）中实现 susceptibility-weighted 成像，我们开发了一种名为“susceptibility difference weighted imaging”（SDWI）的图像处理方法。在 SDWI 中，使用通过具有小迭代次数的加权最小二乘算法计算的磁化率图来增强对比度。对人类志愿者进行了实验，以比较从传统方法（SWI）和 SDWI 获得的图像对比度。在水平场 MRI 中，SDWI 结果表明静脉和深部灰质核与 SWI 一样被可视化。在垂直场 MRI 中，SDWI 可以可视化静脉和深部灰质核，且没有严重的条纹伪影，而 SWI 则不行。在我们的实验中，SDWI 中计算磁化率图所需的时间少于 10 秒。结果表明，使用 SDWI 在垂直场 MRI 中进行 susceptibility-weighted 成像是可行的。
