Bakker C J, Bos C, Weinmann H J
Department of Radiology, University Medical Center Utrecht, Utrecht, The Netherlands.
Magn Reson Med. 2001 Jan;45(1):17-23. doi: 10.1002/1522-2594(200101)45:1<17::aid-mrm1003>3.0.co;2-9.
Passive MR tracking of catheters and guidewires is usually done by dynamically imaging a single thick slab, subtracting a baseline image, and combining the result with a previously acquired MR angiogram. In the in vitro and in vivo experiments reported here, it is demonstrated that this approach may be greatly simplified by using a suitable intravascular contrast agent. The proposed method, contrast-enhanced MR fluoroscopy, combines tracking and angiography into a single sequence and allows direct visualization of the magnetically prepared parts of catheters and guidewires with respect to the vasculature at a frame rate of about one image per 1.5 seconds. Contrast-enhanced MR fluoroscopy, although still limited in temporal resolution, thus obviates the need for subtraction and overlay techniques and eliminates the sensitivity of tracking to subject motion between acquisitions. Magn Reson Med 45:17-23, 2001.
导管和导丝的被动磁共振跟踪通常通过对单个厚层进行动态成像、减去基线图像并将结果与先前获取的磁共振血管造影相结合来完成。在本文报道的体外和体内实验中，结果表明使用合适的血管内造影剂可大大简化这种方法。所提出的方法，即对比增强磁共振荧光透视，将跟踪和血管造影结合到一个序列中，并允许以约每秒1.5帧的帧率直接观察导管和导丝相对于脉管系统的磁性准备部分。因此，对比增强磁共振荧光透视虽然在时间分辨率上仍然有限，但避免了减法和叠加技术的需要，并消除了跟踪对采集之间受试者运动的敏感性。《磁共振医学》45:17 - 23, 2001年。
