Werner Richard, Krueger Sascha, Winkel Axel, Albrecht Christoph, Schaeffter Tobias, Heller Martin, Frahm Christian
Section of Neuroradiology, Christian-Albrechts-Universität, Kiel, Germany.
J Magn Reson Imaging. 2006 Jul;24(1):235-41. doi: 10.1002/jmri.20600.
To evaluate the advantages of using an active marker (active micro coil) for MR-guided breast biopsy procedures.
An add-on breast biopsy guidance device used with a standard breast coil was equipped with an active marker. The marker's position was determined with a dedicated MRI sequence. In combination with custom software, the biopsy planning process was reduced basically to defining the target in the diagnostic MR images. Automatic control scans verified the settings of the biopsy guidance device. To measure the targeting accuracy, x-ray control of the needle placement was performed in phantoms containing 36 small titanium cylinders. The reliability of the procedure was evaluated in 24 core needle biopsies on phantoms. Workflow enhancements were analyzed.
The root mean square deviation of the needle position from the target perpendicular to the needle axis was 1.25 mm, in three-dimensions it was 1.35 mm. All targets were sampled successfully. The duration of a phantom biopsy was nine minutes.
The use of an active marker can offer advantages for MR-guided breast biopsies in terms of handling and procedure time as well as accuracy.
评估在磁共振引导下的乳腺活检程序中使用活性标记物（活性微线圈）的优势。
一种与标准乳腺线圈配合使用的附加式乳腺活检引导装置配备了活性标记物。通过专用的磁共振成像序列确定标记物的位置。结合定制软件，活检计划过程基本简化为在诊断性磁共振图像中确定目标。自动控制扫描验证了活检引导装置的设置。为测量靶向准确性，在含有36个小钛圆柱体的模型中对针的放置进行了X射线控制。在模型上进行了24次粗针活检，评估了该程序的可靠性。分析了工作流程的改进情况。
针位置与垂直于针轴的目标之间的均方根偏差为1.25毫米，三维偏差为1.35毫米。所有目标均成功取样。模型活检的持续时间为9分钟。
在磁共振引导下的乳腺活检中，使用活性标记物在操作、程序时间以及准确性方面都具有优势。
