Closed bore XMR (CBXMR) systems for aortic valve replacement: active magnetic shielding of x-ray tubes.
Closed bore XMR (CBXMR) systems for aortic valve replacement: active magnetic shielding of x-ray tubes.
复制标题
用于主动脉瓣置换的闭孔 XMR (CBXMR) 系统：X 射线管的主动磁屏蔽。
DOI：
10.1118/1.3116363
复制
发表时间：
2009
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：
Bracken,JohnA;DeCrescenzo,Giovanni;Komljenovic,Philip;Lillaney,PrasheelV;Fahrig,Rebecca;Rowlands,JA
正在开发混合闭孔X射线/MRI系统，通过在单个介入室中利用X射线和MRI模态的互补优势，提高经皮主动脉瓣置换术的安全性和有效性，而无需在两个房间之间转移患者。这些系统由靠近MRI扫描仪的X射线C形臂组成。MRI磁边缘场可导致X射线管中的电子束偏转。偏转导致X射线视场在探测器插座上移动位置。这可能导致患者和心导管实验室的工作人员受到不必要的辐射。因此，必须校正电子束偏转。作者开发了一种主动磁屏蔽系统，可以将电子束偏转校正到5%的精度内，而不会截断视场或增加对患者的暴露。当作用于X射线管的外部磁场发生变化时，该系统能够自动调整至不同的场强。尽管将有源屏蔽系统的屏蔽线圈置于磁场中时，在其上观察到较小的扭矩，但如果将其牢固安装在X射线管和C形臂上，则该扭矩不会影响其性能。临床使用的屏蔽系统线圈由电流引起的加热被发现足够慢，不需要用于经皮主动脉瓣置换术的专用冷却系统。但是，如果在一个会话中执行多个程序，则需要冷却系统。
Hybrid closed bore x‐ray/MRI systems are being developed to improve the safety and efficacy of percutaneous aortic valve replacement procedures by harnessing the complementary strengths of the x‐ray and MRI modalities in a single interventional suite without requiring patient transfer between two rooms. These systems are composed of an x‐ray C‐arm in close proximity to an MRI scanner. The MRI magnetic fringe field can cause the electron beam in the x‐ray tube to deflect. The deflection causes the x‐ray field of view to shift position on the detector receptacle. This could result in unnecessary radiation exposure to the patient and the staff in the cardiac catheterization laboratory. Therefore, the electron beam deflection must be corrected. The authors developed an active magnetic shielding system that can correct for electron beam deflection to within an accuracy of 5% without truncating the field of view or increasing exposure to the patient. This system was able to automatically adjust to different field strengths as the external magnetic field acting on the x‐ray tube was changed. Although a small torque was observed on the shielding coils of the active shielding system when they were placed in a magnetic field, this torque will not impact their performance if they are securely mounted on the x‐ray tube and the C‐arm. The heating of the coils of the shielding system for use in the clinic caused by electric current was found to be slow enough not to require a dedicated cooling system for one percutaneous aortic valve replacement procedure. However, a cooling system will be required if multiple procedures are performed in one session.
登录
查看更多内容
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。
影响因子：
3.8
作者：
Brzozowski,Lukasz;Ganguly,Arundhuti;Pop,Mihaela;Wen,Zhifei;Bennett,Robert;Fahrig,Rebecca;Rowlands,JA
通讯作者：
Rowlands,JA
用于主动脉瓣置换术的闭孔 XMR (CBXMR) 系统：X 射线管成像性能。
影响因子：
3.8
作者：
Bracken,JohnA;Komljenovic,Philip;Lillaney,PrasheelV;Fahrig,Rebecca;Rowlands,JA
通讯作者：
Rowlands,JA
适用于 MR 扫描仪磁场的坚固 X 射线管。
影响因子：
3.8
作者：
Wen,Zhifei;Fahrig,Rebecca;Pelc,NorbertJ
通讯作者：
Pelc,NorbertJ
平行磁场中的 X 射线管
影响因子：
24
作者：
Z. Wen;R. Fahrig;N. Pelc
通讯作者：
N. Pelc
为什么患有主动脉瓣狭窄的老年人很少接受瓣膜置换手术？
影响因子：
6.7
作者：
A. Abdul;G. Mulley
通讯作者：
G. Mulley