Noncontact backscatter-mode near-infrared time-resolved imaging system: preliminary study for functional brain mapping

2006 ◽  
Vol 11 (5) ◽  
pp. 054006 ◽  
Author(s):  
Ichiro Sase ◽  
Akira Takatsuki ◽  
Junji Seki ◽  
Toshio Yanagida ◽  
Akitoshi Seiyama
Keyword(s):  
Brain Mapping ◽  
Near Infrared ◽  
Imaging System ◽  
Time Resolved ◽  
Functional Brain ◽  
Functional Brain Mapping ◽  
Preliminary Study ◽  
Time Resolved Imaging

scholarly journals Development of Near Infrared Time-Resolved Imaging System.

2001 ◽  
Vol 41 (supplement) ◽  
pp. S90
Author(s):  
I. Sase ◽  
H. Eda ◽  
A. Takatsuki ◽  
A Seiyama ◽  
T. Yanagida
Keyword(s):  
Near Infrared ◽  
Imaging System ◽  
Time Resolved ◽  
Time Resolved Imaging

Functional Brain Mapping During Surgery with Sensitive, High-resolution Digital Optical Infrared Imaging

Neurosurgery ◽  
1997 ◽  
Vol 41 (3) ◽  
pp. 751-751
Author(s):  
Gorbach Alexander ◽  
Heiss John ◽  
Kufta Conrad ◽  
H. Oldfield Edward
Keyword(s):  
High Resolution ◽  
Brain Mapping ◽  
Infrared Imaging ◽  
Functional Brain ◽  
Functional Brain Mapping

scholarly journals Giant enhancement of THz-frequency optical nonlinearity by phonon polariton in ionic crystals

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yao Lu ◽  
Qi Zhang ◽  
Qiang Wu ◽  
Zhigang Chen ◽  
Xueming Liu ◽  
...  
Keyword(s):  
Near Infrared ◽  
Optical Nonlinearity ◽  
Ionic Crystals ◽  
Nonlinear Optical Susceptibility ◽  
Time Resolved ◽  
Light Coupling ◽  
Tremendous Progress ◽  
Fundamental Research ◽  
Ionic Contribution ◽  
Time Resolved Imaging

AbstractThe field of nonlinear optics has grown substantially in past decades, leading to tremendous progress in fundamental research and revolutionized applications. Traditionally, the optical nonlinearity for a light wave at frequencies beyond near-infrared is observed with very high peak intensity, as in most materials only the electronic nonlinearity dominates while ionic contribution is negligible. However, it was shown that the ionic contribution to nonlinearity can be much larger than the electronic one in microwave experiments. In the terahertz (THz) regime, phonon polariton may assist to substantially trigger the ionic nonlinearity of the crystals, so as to enhance even more the nonlinear optical susceptibility. Here, we experimentally demonstrate a giant second-order optical nonlinearity at THz frequency, orders of magnitude higher than that in the visible and microwave regimes. Different from previous work, the phonon-light coupling is achieved under a phase-matching setting, and the dynamic process of nonlinear THz generation is directly observed in a thin-film waveguide using a time-resolved imaging technique. Furthermore, a nonlinear modification to the Huang equations is proposed to explain the observed nonlinearity enhancement. This work brings about an effective approach to achieve high nonlinearity in ionic crystals, promising for applications in THz nonlinear technologies.

scholarly journals Integrated SSFP for functional brain mapping at 7 T with reduced susceptibility artifact

2017 ◽  
Vol 276 ◽  
pp. 22-30 ◽  
Author(s):  
Kaibao Sun ◽  
Rong Xue ◽  
Peng Zhang ◽  
Zhentao Zuo ◽  
Zhongwei Chen ◽  
...  
Keyword(s):  
Brain Mapping ◽  
Functional Brain ◽  
Susceptibility Artifact ◽  
Functional Brain Mapping

Functional brain mapping of actual car-driving using [18F]FDG-PET

2006 ◽  
Vol 20 (9) ◽  
pp. 623-628 ◽  
Author(s):  
Myeonggi Jeong ◽  
Manabu Tashiro ◽  
Laxsmi N. Singh ◽  
Keiichiro Yamaguchi ◽  
Etsuo Horikawa ◽  
...  
Keyword(s):  
Brain Mapping ◽  
Fdg Pet ◽  
Functional Brain ◽  
Functional Brain Mapping ◽  
18F Fdg ◽  
Car Driving

scholarly journals Axon hillock currents enable single-neuron-resolved 3D reconstruction using diamond nitrogen-vacancy magnetometry

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Madhur Parashar ◽  
Kasturi Saha ◽  
Sharba Bandyopadhyay
Keyword(s):  
Brain Mapping ◽  
Pyramidal Neurons ◽  
Matching Pursuit ◽  
Resolution Enhancement ◽  
Nitrogen Vacancy ◽  
Mammalian Brain ◽  
Functional Brain ◽  
Functional Brain Mapping ◽  
Axon Hillock ◽  
Mapping Techniques

Abstract Sensing neuronal action potential associated magnetic fields (APMFs) is an emerging viable alternative of functional brain mapping. Measurement of APMFs of large axons of worms have been possible due to their size. In the mammalian brain, axon sizes, their numbers and routes, restricts using such functional imaging methods. With a segmented model of mammalian pyramidal neurons, we show that the APMF of intra-axonal currents in the axon hillock are two orders of magnitude larger than other neuronal locations. Expected 2D magnetic field maps of naturalistic spiking activity of a volume of neurons via widefield diamond-nitrogen-vacancy-center-magnetometry were simulated. A dictionary-based matching pursuit type algorithm applied to the data using the axon-hillock’s APMF signature allowed spatiotemporal reconstruction of action potentials in the volume of brain tissue at single cell resolution. Enhancement of APMF signals coupled with magnetometry advances thus can potentially replace current functional brain mapping techniques.

scholarly journals Functional brain mapping at 9.4T using a new MRI-compatible electrode chronically implanted in rats

2008 ◽  
Vol 61 (1) ◽  
pp. 222-228 ◽  
Author(s):  
Jeff F. Dunn ◽  
Ursula I. Tuor ◽  
Jonn Kmech ◽  
Nicole A. Young ◽  
Amy K. Henderson ◽  
...  
Keyword(s):  
Brain Mapping ◽  
Functional Brain ◽  
Functional Brain Mapping
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