Abstract: A magnetic resonance imaging (“MRI”) system that can be operated while a subject performs, experiences, or otherwise undergoes naturalistic motion. This movable MRI (“mMRI”) system includes a magnet whose position and orientation can be changed while the subject is moving, such that the magnet and subject maintain a substantially fixed spatial relationship relative to each other.

Abstract: A magnetic resonance imaging (“MRI”) system that can be operated while a subject performs, experiences, or otherwise undergoes naturalistic motion. This movable MRI (“mMRI”) system includes a magnet whose position and orientation can be changed while the subject is moving, such that the magnet and subject maintain a substantially fixed spatial relationship relative to each other.

Abstract: In one aspect, the present invention provides a cylindrical meanderline coil that can significantly improve the performance and usefulness of nuclear magnetic resonance (NMR) catheter radiofrequency (RF) coils by shaping the spatial dimensions of the volume of excitation and reception of signal. This can provide improved accuracy in defining the volume of excitation and reception of the subject or specimen, and increase the signal to noise ratio of a received signal. In another aspect, the invention provides an intravascular catheter having a coil at its tip for generating and/or detecting magnetic excitations. A preamplifer coupled to the catheter in proximity of the coil allows amplifying signals generated and/or detected by the coil.

Abstract: An apparatus and technique for measuring volumetric, 3-D bone organic matrix density is described. The techniques includes providing a first pulse sequence fragment selected to suppress at least two fluid resonance signals and providing a second pulse sequence fragment which images at least solid signals. In one embodiment, a series of RF pulses used to suppress fluid in the bone marrow spaces, particularly in cancellous bone tissue, is combined with solid state projection reconstruction magnetic resonance imaging (MRI) to provide a three-dimensional image of a bone in which the dominant signal arises substantially from solid organic bone matrix.