Stripline resonator and preamplifier for preclinical magnetic resonance imaging at 4.7 T
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Ioannis Lavdas · Hugh C. Seton · Charles R. Harrington · Claude M. Wischik
- چاپ و سال / کشور: 2011
Description
Object To design and evaluate a fully shielded, ë/4 stripline resonator as a receive-only surface coil for preclinical MRI at 4.7 T. Materials and methods A 20mm diameter stripline surface coil was fabricated from double-sided Duroid 5880 PCB material and was directly coupled to the input of aMOSFET preamplifier, without requiring a matching network. The new coil was compared with a conventional 20mm, wire loop, receive-only surface coil in imaging experiments with a separate transmit-only saddle coil. Results The stripline surface coil exhibits a loaded Q-factor of 132 at 200 MHz, compared to 138 for a conventional wire loop coil and its resonant frequency drops by 0.2MHz under loading, rather than 0.5 MHz for the wire loop. The stripline coil displays a more symmetrical B1 map compared to the wire loop, but the SNR falls off more rapidly with depth so it is 30% poorer 8 mm from the coil plane. It should be possible, however, to reduce this difference by using a thicker dielectric in future versions of the stripline coil. Conclusion Compared to a conventional surface coil, the stripline coil is easy to manufacture, requires shorter set-up times and shows reduced dielectric interaction with conductive samples.
Magn Reson Mater Phy DOI 10.1007/s10334-011-0273-8 Received: 3 March 2011 / Revised: 30 June 2011 / Accepted: 1 July 2011
