Abstract: Various methods of telemetry for nuclear magnetic resonance applications are described. NMR-active particles are introduced into a system which is to undergo an NMR measurement. In various embodiments, the NMR-active particles have a resonance peak in a spectral region which is substantially free from any NMR signal originating from material native to the system. In some embodiments, the NMR-active particles are chemically functionalized to target a constituent within the system. In certain applications, changes in the detected resonance peak can be used to quantify certain characteristics about the system, e.g., a concentration of an analyte, whether a targeted constituent is present within the system.

Abstract: An optical image-based tracking system determines the position and orientation of objects such as biological materials or medical devices within or on the surface of a human body undergoing Magnetic Resonance Imaging (MRI). Three-dimensional coordinates of the object to be tracked are obtained initially using a plurality of MR-compatible cameras. A calibration procedure converts the motion information obtained with the optical tracking system coordinates into coordinates of an MR system. A motion information file is acquired for each MRI scan, and each file is then converted into coordinates of the MRI system using a registration transformation. Each converted motion information file can be used to realign, correct, or otherwise augment its corresponding single MR image or a time series of such MR images.