MAGNETIC-FIELD MAPPING
MAGNETIC-FIELD MAPPING
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DOI：
10.1002/mrm.1910060204
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发表时间：
1988-02-01
影响因子：
3.3
通讯作者：
BRYANT, RG
中科院分区：
文献类型：
--
作者：
HORNAK, JP;SZUMOWSKI, J;BRYANT, RG
均匀的射频磁场对于产生高质量的磁性图像和大多数形式的磁共振光谱学都是必要的。通过测量放置在谐振器内的水模的磁像强度来绘制与谐振器相关的射频均匀度图通常是方便的。射频场强与磁像强度之间没有微不足道的关系，不同的图像采集方法，其关系是不同的。在本报告中，推导了射频场强度和磁像强度之间的关系，并提供了使用在共振体积内移动的射频探头、自旋回波图像和小尖角梯度重聚焦回波图像的射频场图以供比较。
Homogeneous radiofrequency magnetic fileds are necessary for production of high-quality magnetic images and for most forms of magnetic resonance spectroscopy. It is often convenient to map the radiofrequency homogeneity associated with a resonant device by measuring the magnetic image intensity of an aqueous phantom placed within the resonator. The rf field intensity is not related trivially to the magnetic image intensity, and the relationship is different for different image acquisition methods. In this report relationships between rf field intensity and magnetic image intensity are derived and radiofrequency field maps presented for comparison using an rf probe moved about within the resonant volume, spin-echo images, and small tip angle gradient refocused echo images.