NMR measurements of hyperpolarized 3He gas diffusion in high

Sep 13, 2005 - In contrast with Vycor glass or porous gold, for in- stance, there is no .... Samples J1−J4 are four pieces of 97% porous aero- gel w...

0 downloads 0 Views 503KB Size

Recommend Documents

Aug 2, 2002 - hypotheses; design and implementation of PGSE NMR experiments; analysis and interpretation of diffusion and simulation data; involvement in all discussion of ideas relating to the project. V. Regan D.G., Kuchel P.W. (2002) Simulations o

Jun 10, 2010 - Stephen Choy,1 Andrew Wheatley,1 David G. McCormack,1,2 and Grace Parraga1 ... (MR) methods can be used that are sensitive to 3He gas ... space (akin to an infinitely large container) to 0.66 cm2/s for an .... Subjects were administere

Mar 14, 2016 - factor of 104 according to Poiseuille's law and avoided diameters of zero in the simulations (Tgavalekos et ... Flow was described by Womers- ley (Kaczka et al. 2007) where the complex impedance of each nonterminal airway branch was ca

Jun 5, 2008 - the regional distribution of anatomical and functional pulmo- .... body plethysmography (SensorMedics VIASYS Healthcare, Yorba. Linda, CA) was ..... and clinical database management; W. Lam and A. Wheatley for production .... B. Effects

magnitude, ranging between 10-7 m2s-1 to 10-14 m2s-1 (and comfortably beyond in favourable samples). Starting with the basic theory of NMR based diffusion measurements this chapter then proceeds to demonstrate the wide range of systems in which diffu

Mar 3, 2008 - gas were done about four years ago, first in glass and plastic cells [1], and ..... the graphs are broken to accentuate the evolution of the echoes. ..... Heil, D. Hoffman, R. Surkau, and E.W. Otten, Nuclear Magnetic Resonance.

Mar 14, 2016 - (Pike etal. 2015) with fiducial localization error of. 3–6 mm in the x and y plane and Dice similarity coeffi- cients similar to what was achieved here (mean ..... Sun, M. Albert, et al. 2009. Probing airway conditions governing vent

LCD, liquid crystal display; PIC, peripheral interface controller; RF, radio frequency. ... controller (PIC) has 16 I/O ports and is programmed on a. PC using a ...

The most common PFG NMR diffusion experiment is a spin echo pulse sequence ..... [6] R. Kimmich, NMR: Tomography, Diffusometry, Relaxometry, Springer, ...

Radon diffusion through cracked concrete is a major radon entry route in residential construction. This paper presents the preliminary experimental results of the influence of cracks on the radon gas diffusion coefficient through concrete. Concrete s

Mar 10, 2006 - Fundamental measurement of 3He gas anisotropic diffusion in human lung and evaluation of lung microstructure . ..... unity by transfer of angular momentum from circularly ..... The free diffusivity D0 of 3He gas dilute in N2 or air has

Oct 18, 1999 - diffusion NMR (GD-NMR) should be applicable to these and many other situations, allowing noninvasive determi- nations of the structure of porous media. NMR measurements of the diffusion of liquids im- bibed in porous media is a well-un

The magnetization in hyperpolarized gas (HP) MRI is gener- ated by laser polarization ... sources (P41 05959). Additional support was provided by the Air Force.

Jul 20, 2015 - Natural abundance 13C NMR spectra of biological extracts are recorded in a ... hyperpolarized breast cancer cell extracts can also be obtained .... this problem by simply using cross-polarization from 1H to 13C nuclei.12 The ...

Jul 29, 2013 - the coil region, allowed us to rely on these 31P NMR data to further quantify the ... pulses was applied at the chemical shift of the intermediate.

Aug 2, 2000 - Its special features include a signal to noise ratio. (SNR) is independent ... Comparison tests between different human sized coils were done to ...

Imaging the respiratory tract using traditional MRI methods is very difficult. Our client, ... Medical imaging systems are useful in diagnosis and physiological verification. ..... Aesthetics – It doesn't have to look pretty, function is more impor

Apr 30, 2007 - Note that the sign of the magnetic moment is carried implicitly in g or ...... representation in the frequency domain is [Purcell, E.M. Electricity.

Results and Discussion: An increase of mean linear intercept, Lm, of 70% ... Table 1 shows the mean DT, DL measurd in both cohorts, as well as the p-values.

Hyperpolarized 129Xe (HpXe) NMR not only holds promise for functional lung imag- ing but for measurements of tissue perfusion as ... Table 1: Model parameters taken from reference (7) unless stated otherwise compartments. Xe solubility coefficients p

13C-labeled glutamate in the muscle of a perfused hindquarter model. (Bertocci et al., 1997; ... Biologique et Medicale, Aix-Marseille University, Marseille 13385, France. *Author for ... 2 shows the kinetics after injection of hyperpolarized. [1-13C

diffusion coefficients and spin-relaxation time constants for the chemically similar ... by nuclear magnetic resonance (NMR) spectroscopy can provide important ...

Jul 7, 2007 - Physics Department, University of Massachusetts,. Amherst, MA 01003, USA e-mail: [email protected] R. Wang · R. W. Mair · R. L. ...

Apr 4, 2007 - monitoring of disease progression—in some cases with the necessary .... exposure to ionizing radiation for longitudinal studies involving ...