Sittek H, Perlet C, Herrmann K, Linsmeier E, Kolem H, Untch M, Kessler M, Reiser M
Institut für Radiologische Diagnostik, Ludwig-Maximilians-Universität, München.
Radiologe. 1997 Sep;37(9):685-91. doi: 10.1007/s001170050269.
To answer the following questions: whether reliable detection of lesions is possible in low-field-MRI-system (Magnetom Open 0.2 T) equipped with currently available hard- and software components in comparison to high field system (Magnetom Impact 1.0 T). Furthermore, whether localization of lesions suspect in MR-mammography can be realized in MR system of low field (Magnetom Open 0.2 T).
In 11 patients, suspect lesions were diagnosed in diagnostic MR-mammography acquired with high field system (Magnetom Impact 1.0 T) and were compared to low field MR-mammographies of 0.2 T (Magnetom Open 0.2 T). In six of the 11 patients a suspect lesion was localized using wire marking.
All lesions considered suspect in diagnostic MR-mammography (Magnetom Impact 1.0 T) were also clearly identified in the 0.2 T system (Magnetom Open). In six cases wire marking was performed without any complications and with an accuracy of < or = 0.5 cm distance to the lesion.
Although studies in the 0.2 T system clearly showed inferior SNR (34.6 vs. 83.1) and CNR (14.6 vs. 43.5) compared to studies with the high field system, all lesions considered suspect in diagnostic MR-mammography were reliably identified also in 0.2 T studies. Due to its open construction permitting permanent access to the breast and due to sufficient image quality, the Magnetom Open is suitable for interventions on the breast.
回答以下问题：与高场系统（Magnetom Impact 1.0 T）相比，配备当前可用硬件和软件组件的低场MRI系统（Magnetom Open 0.2 T）是否能够可靠地检测病变。此外，低场（Magnetom Open 0.2 T）MR系统是否能够实现乳腺磁共振成像中可疑病变的定位。
对11例患者进行研究，在高场系统（Magnetom Impact 1.0 T）下进行乳腺磁共振诊断成像，发现可疑病变，并与0.2 T（Magnetom Open 0.2 T）的低场乳腺磁共振成像进行比较。11例患者中有6例通过金属丝标记对可疑病变进行了定位。
在乳腺磁共振诊断成像（Magnetom Impact 1.0 T）中被视为可疑的所有病变，在0.2 T系统（Magnetom Open）中也能清晰识别。6例进行了金属丝标记，未出现任何并发症，标记位置与病变的距离误差≤0.5 cm。
尽管与高场系统相比，0.2 T系统的研究明显显示出较低的信噪比（34.6对83.1）和对比噪声比（14.6对43.5），但在乳腺磁共振诊断成像中被视为可疑的所有病变在0.2 T的研究中也能被可靠识别。由于其开放式结构允许对乳房进行持续观察，且图像质量足够，Magnetom Open适用于乳房干预操作。
