Closed bore XMR (CBXMR) systems for aortic valve replacement: investigation of rotating-anode x-ray tube heat loadability.
Closed bore XMR (CBXMR) systems for aortic valve replacement: investigation of rotating-anode x-ray tube heat loadability.
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用于主动脉瓣置换的闭孔 XMR (CBXMR) 系统：旋转阳极 X 射线管热负荷能力的研究。
DOI：
10.1118/1.2968337
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发表时间：
2008
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;Lillaney,PrasheelV;Fahrig,Rebecca;Rowlands,JA
为了提高经皮主动脉瓣置换术的安全性和有效性，提出了一种闭孔X-射线/磁共振(CBXMR)系统，该系统将X线C形臂等中心放置在临床MRI扫描仪的入口处。这一系统将利用两种模式的互补优势来改善临床结果。CBXMR系统的一个关键部件将是旋转阳极X射线管，以产生高质量的X射线图像。在核磁共振磁体的磁缘场中定位X射线管存在挑战。本文研究了外加磁场对X射线管感应电机的影响，以及相应降低X射线管热负荷的问题。当外加磁场平行于阳极的旋转轴时，阳极旋转频率不受影响，当磁场垂直于旋转轴时，阳极旋转频率降低。实验值与预测值在一定范围内吻合较好。安装在C形臂上的X射线管的建议位置处的MRI条纹场仅减少1%，因此在使用CBXMR系统进行经皮主动脉瓣置换手术时，X射线管的热负荷不会受到影响。由于磁共振条纹场在转子中产生的涡流加热功率比由于透视曝光在阳极上产生的加热功率小两个数量级，所以涡流加热对X射线管的热负荷没有影响。
In order to improve the safety and efficacy of percutaneous aortic valve replacement procedures, a closed bore hybrid x‐ray/MRI (CBXMR) system is proposed in which an x‐ray C‐arm will be positioned with its isocenter from the entrance of a clinical MRI scanner. This system will harness the complementary strengths of both modalities to improve clinical outcome. A key component of the CBXMR system will be a rotating anode x‐ray tube to produce high‐quality x‐ray images. There are challenges in positioning an x‐ray tube in the magnetic fringe field of the MRI magnet. Here, the effects of an external magnetic field on x‐ray tube induction motors of radiography x‐ray tubes and the corresponding reduction of x‐ray tube heat loadability are investigated. Anode rotation frequency was unaffected when the external magnetic field was parallel to the axis of rotation of the anode but decreased when was perpendicular to the axis of rotation. The experimental values agreed with predicted values to within over a range of . The MRI fringe field at the proposed location of the x‐ray tube mounted on the C‐arm reduced by only 1%, so x‐ray tube heat loadability will not be compromised when using CBXMR systems for percutaneous aortic valve replacement procedures. Eddy current heating power in the rotor due to an MRI fringe field was found to be two orders of magnitude weaker than the heating power produced on the anode due to a fluoroscopic exposure, so eddy current heating had no effect on x‐ray tube heat loadability.
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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
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影响因子：
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作者：
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DOI：
10.1097/01.rvi.0000143766.08029.6e
发表时间：
2005-02-01
影响因子：
2.9
作者：
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影响因子：
2.8
作者：
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通讯作者：
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影响因子：
2.3
作者：
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