We describe the use of liquid helium-cooled (4.2 K) gradiometer coils and a DC superconducting quantum interference device (SQUID) preamplifier to improve the SNR of magnetic resonance imaging (MRI) at 0.01 T. Gradiometer windings are used both to reduce lossy interactions with the MRI system's room
Breast coil design for low-field mri
β Scribed by Markku Komu; Martti Kormano
- Book ID
- 102532357
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 306 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0740-3194
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β¦ Synopsis
Abstract
Four doubleβbreast coils were designed for the lowβfield resistive magnet MR imaging of female breasts at 0.02, 0.04, and 0.1 T. The signalβtoβnoise ratio is optimized by shaping the coils, by constructing two different size coils at 0.02 T, and by using special wire for the turns of the solenoidal coils. The approximate linear dependence of the SNR on the Larmor frequency is estimated.
π SIMILAR VOLUMES
## Abstract Imaging at low fields imposes a number of nonstandard requirements on the RF coil. At low fields, coil losses are dominant over patient losses. This means that even more stress is put on the quality factor __Q.__ Furthermore, the low frequency also implies a high inductance L and/or a h