NQR DETECTION USING A MEANDERLINE SURFACE COIL

被引:40
作者
BUESS, ML
GARROWAY, AN
MILLER, JB
机构
来源
JOURNAL OF MAGNETIC RESONANCE | 1991年 / 92卷 / 02期
关键词
D O I
10.1016/0022-2364(91)90276-Y
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
14N pure NQR detection in a thin-layer sample using a meanderline, or zig-zag, surface coil is reported. The RF magnetic field of the meanderline drops off approximately as exp- πh b), where b is the conductor spacing and h is the distance from the plane of the coil, and therefore is ideally suited for NQR detection in thin, planar samples. A meanderline with 11 conducting strips of 4 cm spacing was used to observe the 14N ν-resonance line in sodium nitrite at sample distances up to 1.6 cm, where the RF field has dropped to less than 1 e. The meanderline results are compared with those obtained using a solenoid of comparable dimensions. It is also shown that the sensitivity of NQR detection using surface coils is greatly enhanced by using fast-pulsing techniques such as the strong off resonance comb, which can produce an order-of-magnitude or better improvement in the signal-to-noise ratio over more conventional (T1-limited) techniques. © 1991.
引用
收藏
页码:348 / 362
页数:15
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