title: Radiofrequency coils for magnetic resonance microscopy.
abstract: Given the several orders of magnitude fewer spins per voxel for MR microscopy than for conventional MRI, efficient coil design is important to obtain sufficient signal-to-noise within reasonable data acquisition times. As MR microscopy is typically performed using very high magnetic fields, coil design must also incorporate the effects of increased component losses and skin-depth-dependent resistance, as well as radiation losses and phase effects for coils when conductor dimensions constitute a substantial fraction of the electromagnetic wavelength. For samples much less than 1 mm in size, wire solenoids or microfabricated planar coils are used. For samples with diameters of several millimeters, saddle, birdcage, Alderman-Grant or millipede coils become the preferred choice. Recent advances in multiple-coil probes and phased arrays have been used to reduce data acquisition time and/or increase sample throughput, and small superconducting coils have shown significant improvements in signal-to-noise over equivalently sized room-temperature coils.
authors.affiliation: Department of Bioengineering, Pennsylvania State University, University Park, PA, USA.
authors.forename: Thomas
authors.initials: T
authors.lastname: Neuberger
authors.forename: Andrew
authors.initials: A
authors.lastname: Webb
mesh_terms: D000818:Animals; D003198:Computer Simulation; D004058:Diffusion; D049452:Green Fluorescent Proteins / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation*; D051379:Mice; D008853:Microscopy / Q000295:instrumentation*; D008856:Microscopy, Fluorescence; D011846:Radio Waves; D051381:Rats; D013113:Spin Labels; D013997:Time Factors
chemical_list: D013113:Spin Labels; D049452:Green Fluorescent Proteins