Do Respiration and Cardiac Motion Induce Magnetic Field Fluctuations in the Breast and Are There Implications for MR Thermometry?
Do Respiration and Cardiac Motion Induce Magnetic Field Fluctuations in the Breast and Are There Implications for MR Thermometry?
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DOI：
10.1002/jmri.21680
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发表时间：
2009-03-01
影响因子：
4.4
通讯作者：
Bakker, Chris J. G.
中科院分区：
文献类型：
--
作者：
Peters, Nicky H. G. M.;Bartels, Lambertus W.;Bakker, Chris J. G.
目的：评估呼吸和心脏运动引起的磁场波动在乳腺中的分布，并评估这种波动对质子共振频移（PRFS）MR测温的影响。材料和方法：在4名健康女性志愿者中制作梯度回波MR场图，研究规律呼吸、最大容量呼吸和心脏运动对局部磁场稳定性的影响。场波动（百万分之一[ppm]）的平均超过一个区域的利益覆盖both breasts.Results：平均场波动，由于定期呼吸是0.13 ppm，由于最大容量呼吸0.16 ppm，
Purpose:To assess the distribution of respiration and cardiac motion-induced field fluctuations in the breast and to evaluate the implications of such fluctuations for proton resonance frequency shift (PRFS) MR thermometry in the breast.Materials and Methods: Gradient echo MR field maps were made to study the effect of regular respiration, maximum capacity respiration, and cardiac motion on the stability of the local magnetic field in four healthy female volunteers. Field fluctuations (in parts-per-million [ppm]) were averaged over a region of interest covering both breasts.Results: The average field fluctuation due to regular respiration was 0.13 ppm, due to maximum capacity respiration 0.16 ppm and