Compatibility of interventional x-ray and magnetic resonance imaging: feasibility of a closed bore XMR (CBXMR) system.
Compatibility of interventional x-ray and magnetic resonance imaging: feasibility of a closed bore XMR (CBXMR) system.
复制标题
介入 X 射线和磁共振成像的兼容性：闭孔 XMR (CBXMR) 系统的可行性。
DOI：
10.1118/1.2219328
复制
发表时间：
2006
期刊：
影响因子：
3.8
通讯作者：
Rowlands,JA
中科院分区：
文献类型：
--
作者：
Brzozowski,Lukasz;Ganguly,Arundhuti;Pop,Mihaela;Wen,Zhifei;Bennett,Robert;Fahrig,Rebecca;Rowlands,JA
提出了下一代介入引导系统，该系统将能够在术中访问 X 射线和磁共振成像 (MRI) 模式。这种闭孔 XMR (CBXMR) 系统由传统的射线照相旋转阳极 X 射线管和位于 MRI 孔附近的旋转机架上的直接转换平板探测器组成。为了评估这种系统的可行性，我们研究了 X 射线组件和 MRI 之间的兼容性程度。因为无论 相对于电机旋转轴的方向如何，对射线照相管电机的影响都可以忽略不计——阳极旋转的频率保持在 处测量的频率的 6% 以内。因为阳极在所有方向上都减慢至下方。在中间 处，旋转频率在 2400 和 之间变化，显示出对方向的强烈依赖性，垂直于管轴对旋转频率的影响比平行于管轴的影响要强得多。与感应电机的影响相比，平行对阴极-阳极电子束的不利影响比垂直更强烈，其路径与管轴成16°。几百高斯的平行线对X射线焦点有散焦作用。 垂直于电子束移动电子束而没有明显的散焦。我们已经确定，直接转换平板探测器 (FPD) 技术本质上对 不敏感，并且使所提出的 FPD MRI 兼容所需的修改很小。正常视场中 MRI 信号的均匀性并未因 MRI 孔入口附近存在这些 X 射线成分而显着降低。
A next‐generation interventional guidance system is proposed that will enable intraprocedural access to both x‐ray and magnetic resonance imaging (MRI) modalities. This closed bore XMR (CBXMR) system is comprised of a conventional radiographic rotating anode x‐ray tube and a direct conversion flat panel detector on a rotating gantry positioned adjacent to the bore of a MRI. To assess the feasibility of such a system, we have investigated the degree of compatibility between the x‐ray components and the MRI. For the effect on the radiographic tube motor was negligible regardless of the orientation of with respect to the motor axis of rotation—the frequency of anode rotation remained within 6% of the frequency measured at . For the anode slowed down to below at all orientations. At intermediate , the frequency of rotation varied between 2400 and , showing a strong dependence on orientation, with perpendicular to the tube axis having a much stronger effect on the rotation frequency than parallel to the tube axis. In contrast to the effect of on the induction motor, parallel had a stronger detrimental effect on the cathode‐anode electron beam, whose path was at 16° to the tube axis, than the perpendicular . Parallel of several hundred Gauss had a defocusing effect on the x‐ray focal spot. perpendicular to the electron beam shifted the beam without significant defocusing. We have determined that the direct conversion flat panel detector (FPD) technology is not intrinsically sensitive to , and that the modifications required to make the proposed FPDs MRI compatible are minimal. The homogeneity of the MRI signal in the normal field of view was not significantly degraded by the presence of these x‐ray components in the vicinity of the MRI bore entrance.