4920318 Surface coil system for magnetic resonance imaging

Misic, George J; Hurst, Gregory C.; Holland, G. N.; Patrick, John; Orlando, Paul A.

doi:10.1016/0730-725x(91)90061-p

Cited by 1 publication

(3 citation statements)

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“…The surface coil is widely used in MRI, as it is often a convenient and effective way of obtaining higher localized S/N than can be obtained with volume coils, but it is important to appreciate that the advantages in small-animal applications are often not as great as is seen in human applications, where the volume coil is almost always sample-noise dominated. Several excellent review articles have appeared (11)(12)(13), along with many other articles (14)(15)(16)(17)(18)(19)(20)(21)(22), several book chapters (23,24), and an elementary book devoted to the subject of mid-sized MRI coils (25). We will not attempt to repeat here much of what is already quite accessible.…”

Section: Surface Coilsmentioning

confidence: 99%

“…The RF magnetic field from the loop surface coil over most of its effective region is normal to its plane. A pair of back-to-back D coils (also called a butterfly coil) can be used to generate an RF magnetic field just below their surface that is orthogonal to that of the loop surface coil and, for proper orientation of the D coils, is also orthogonal to B 0 (19,31). Hence, the combination of the loop and pair of D coils, as shown in Fig.…”

Section: Surface Coil Optimizationmentioning

confidence: 99%

“…This coil (or one very similar) has been used in numerous applications from 18 mm at 600 MHz to 160 mm at 125 MHz. In some cases, they have been tunable from 19 F to 1 H.…”

Section: Linear-polarization Volume Coilsmentioning

confidence: 99%

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Radio frequency coil technology for small‐animal MRI

et al. 2007

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A review of the theory, technology, and use of radio frequency (RF) coils for small-animal MRI is presented. It includes a brief overview of MR signal-to-noise (S/N) analysis and discussions of the various coils commonly used in small-animal MR: surface coils, linear volume coils, birdcages, and their derivatives. The scope is limited to mid-range coils, i.e. coils where the product (fd) of the frequency f and the coil diameter d is in the range 2-30 MHz-m. Common applications include mouse brain and body coils from 125 to 750 MHz, rat body coils up to 500 MHz, and small surface coils at all fields. In this regime, all the sources of loss (coil, capacitor, sample, shield, and transmission lines) are important. All such losses may be accurately captured in some modern full-wave 3D electromagnetics software, and new simulation results are presented for a selection of surface coils using Microwave Studio 2006 by Computer Simulation Technology, showing the dramatic importance of the 'lift-off effect'. Standard linear circuit simulators have been shown to be useful in optimization of complex coil tuning and matching circuits. There appears to be considerable potential for trading S/N for speed using phased arrays, especially for a larger field of view. Circuit simulators are shown to be useful for optimal mismatching of ultra-low-noise preamps based on the enhancement-mode pseudomorphic high-electron-mobility transistor for optimal coil decoupling in phased arrays. Cryogenically cooled RF coils are shown to offer considerable opportunity for future gains in S/N in smaller samples.

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