vanSonnenberg E, Hajek P, Gylys-Morin V, Varney R A, Baker L, Casola G, Christensen R, Mattrey R F
Department of Radiology, University of California, San Diego, Medical Center 92103.
AJR Am J Roentgenol. 1988 Oct;151(4):815-7. doi: 10.2214/ajr.151.4.815.
On the basis of laboratory experiments, we devised a wire-sheath system for MR-guided biopsy and drainage and then evaluated that system in 10 patients. The localizing system consisted of a 20-gauge plastic sheath into which a stainless-steel alloy wire had been inserted. In laboratory studies, we compared this wire-sheath assembly with other materials to determine its optimal visualization on MR images. We then used the same wire-sheath system to perform 16 procedures (in 10 patients), including six biopsies, five diagnostic fluid aspirations, and five catheter drainages of infected and noninfected fluid collections. The laboratory results showed that the wire-sheath assembly cast a 7-mm artifact, was visualized well on all pulse sequences, and was safe within the magnet (minimal attraction). The assembly was visualized well in each patient and provided adequate localization. MR-guided biopsy and drainage can be performed with high-resolution detail by using this wire-sheath system. Potential uses of this system include (1) treatment of lesions that can be seen on MR images only (or that can be seen to significantly better advantage on MR images than on sonograms or CT scans), and (2) treatment of patients in whom avoidance of the radiation delivered by CT is imperative.
基于实验室实验，我们设计了一种用于磁共振引导下活检和引流的金属丝-护套系统，然后在10名患者中对该系统进行了评估。定位系统由一个20号塑料护套组成，其中插入了一根不锈钢合金丝。在实验室研究中，我们将这种金属丝-护套组件与其他材料进行了比较，以确定其在磁共振图像上的最佳显影效果。然后，我们使用相同的金属丝-护套系统对10名患者进行了16次操作，包括6次活检、5次诊断性液体抽吸以及5次对感染性和非感染性液体聚集物的导管引流。实验室结果表明，金属丝-护套组件产生7毫米的伪影，在所有脉冲序列上均显影良好，并且在磁体内是安全的（吸引力最小）。该组件在每位患者中均显影良好，并提供了足够的定位。使用这种金属丝-护套系统可以进行高分辨率的磁共振引导下活检和引流。该系统的潜在用途包括：（1）治疗仅在磁共振图像上可见（或在磁共振图像上比在超声图或CT扫描上显示得明显更具优势）的病变；（2）治疗必须避免CT辐射的患者。
