Terms: Neuronal Magnetic Fields (64), neuronal magnetic field (29), neuronal magnetic (176), mr neuronal detection (15), direct mr neuronal detection (15), direct magnetic resonance detection (170), neuronal electrical activity (2,960), neuronal magnetic activity (0),
Terms: magnetic source mri (57), msMRI (941),
Terms: mri detection (34,800), magnetic resonance imaging detection (7,340),
Boolean: "mri detection" +neuronal (1,520), "mri detection" +neuronal +magnetic (1,440), "mri detection" +neuronal +electric (195), "mri detection" +neuronal +direct (775),
Direct measurement of neuronal magnetic field changes evoked by median nerve stimulation using MRI: TE dependence - Direct detection of neuronal magnetic fields to map brain activity is a novel MRI technique that has been developed recently. While different research groups have reported inconsistent results [1-3], there is increasing evidence of the feasibility of this technique. 2008 Human Brain Mapping
Comparison of BOLD and direct-MR neuronal detection (DND) in the human Nov 2008 Sheffield - The mean percentage signal change for the DND responses is 0.2%, corresponding to a predicted neuronal field of 0.14 nT.
Direct magnetic resonance detection of neuronal electrical activity - References - Here, we show that MRI can detect cortical electrical activity directly. PDF
Xue, Yiqun, "Mechanisms And Developments Of Magnetic Source MRI" (2008). Dissertation - PDF
Modelling the magnetic signature of neuronal tissue
Stimulus Induced Rotary Saturation (SIRS); A New Method for the Direct
Stimulus-induced Rotary Saturation (SIRS): A potential method for the detection of neuronal currents with MRI - Recently, the use of ultra-low-field MRI has been proposed to detect neuronal currents (Kraus, 2006; Kraus et al., 2008).
Directly Mapping Magnetic Field Effects of Neuronal Activity by Magnetic Resonance Imaging 2003 - The magnetic-source MRI technique greatly increases the temporal accuracy in detecting neuronal activity, providing a powerful new tool for mapping brain functional organization in human and animals. Jinhu Xiong,* Peter T. Fox, and Jia-Hong Gao
Peter Bandettini papers - Bodurka, J. and P.A. Bandettini, Toward direct mapping of neuronal activity: MRI detection of ultraweak, transient magnetic fields changes. 2002 (NIH P.A. Bandettini)
Mechanisms And Developments Of Magnetic Source MRI
Duke Univ - Dynamic MRI of Small Electrical Activity Nov 2008 - Abstract - Here, we discuss the theory, implementation, and potential utility of an MRI technique termed Lorentz effect imaging (LEI) that can detect spatially incoherent yet temporally synchronized, minute electrical activities in the neural amplitude range (microamperes) when they occur in a strong magnetic field. Moreover, we demonstrate with our preliminary results in phantoms and in vivo, the feasibility of imaging such activities with a temporal resolution on the order of milliseconds.
Duke - Finding neuroelectric activity under magnetic-field oscillations (NAMO) with magnetic resonance imaging in vivo - a Lorentz force equal to the cross-product of the current vector and the magnetic field. .. an elastic medium, this force induces a displacement of the conductor, resulting in a spatially incoherent displacement of the elastic medium in adjacent regions. In the presence of a magnetic field gradient, the spins in these regions experience a loss of phase coherence proportional to its amplitude and duration. This dephasing in turn results in a destructive signal summation within a voxel similar to the transverse relaxation effect, causing an exponential signal decay. As such, this contrast mechanism does not require the current to be unidirectional; in fact, a random current pattern will generate the same effect (15).
Terms: lorentz effect imaging (78), directly image neuroelectric (15), neuroelectric activity (862),Boolean: neuronal +magnetic +mri (682,000), neuronal +magnetic +fmri (436,000),