PLANAR-PAIR LOCAL COILS FOR HIGH-RESOLUTION MAGNETIC-RESONANCE-IMAGING, PARTICULARLY OF THE TEMPOROMANDIBULAR-JOINT
PLANAR-PAIR LOCAL COILS FOR HIGH-RESOLUTION MAGNETIC-RESONANCE-IMAGING, PARTICULARLY OF THE TEMPOROMANDIBULAR-JOINT
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DOI：
10.1118/1.595934
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发表时间：
1986-01-01
期刊：
影响因子：
3.8
通讯作者：
KNEELAND, JB
中科院分区：
文献类型：
--
作者：
HYDE, JS;FRONCISZ, W;KNEELAND, JB
研究了两环一隙环间隙谐振器(平面对)作为1.5T(63.8 MHz)高分辨率质子成像的局域接收线圈。在实验台上，通过测量线圈放置在含有0.1-M氯化钠的罐表面时的感应电压，作为罐内辐射偶极子的坐标和方位的函数，确定了灵敏度等值线。得到了作为两个环的直径D和它们的间隔d的函数的等高线。为了比较，还获得了作为环直径的函数的单圈圆环的大量数据。在自由空间和盐水箱中，报道了线圈品质因数Q‘’S作为几何参数的函数。还使用全身成像器中的模特儿获得了轮廓。平面对线圈耦合到约(2d+d)倍的板材。三维横截面，在成像略有拉长的解剖结构方面优于圆形线圈。平面对局部线圈的一个特别重要的特点是，它们本质上与成像仪的全身线圈隔离，当全身线圈用于激励时，不需要特殊的无源或有源电路。平面对局部线圈已经被优化用于颞颌关节的成像，并显示了一幅图像。
The two-loop-one-gap loop-gap resonator (planar pair) has been investigated as a local receiving coil for high-resolution proton imaging at 1.5 T (63.8 MHz). Sensitivity contours were determined on the bench by measuring the voltage induced in the coil when it is placed on the surface of a tank containing 0.1-M NaCl, as a function of the coordinates and orientation of a radiating dipole inside the tank. Contours were obtained as a function of the diameter D of the two loops, and their separation d. For comparison, considerable data also were obtained for single-turn circular loops as a function of loop diameter. Coil quality factors, Q''s, are reported in free space and the saline tank as a function of geometric parameters. Contours also were obtained using phantoms in a whole-body imager. Planar-pair coils couple to slabs of approximately (2D + d) .times. D cross section, and are superior to circular coils for imaging anatomic structures that are somewhat elongated. A particularly important feature of planar-pair local coils is that they are intrinsically isolated from the whole-body coil of the imager, and no special passive or active circuits are required when the whole-body coil is used for excitation. Planar-pair local coils have been optimized for imaging of the temporomandibular joint, and an image is shown.