Magnetohydrodynamic flow imaging of ionic solutions using electrical current injection and MR phase measurements

Date

2019-06-01

Author

Eroglu, Hasan H.
Sadighi, Mehdi
Eyüboğlu, Behçet Murat

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

248
views

0
downloads

In this study, a method is proposed to image magnetohydrodynamic (MHD) flow of ionic solutions, which is caused by externally injected electrical current to an imaging media, during MRI scans. A multi-physics (MP) model is created by using the electrical current, laminar flow, and MR equations. The conventional spoiled gradient echo MRI pulse sequence with bipolar flow encoding gradients is utilized to encode the MHD flow. Using the MP model and the MRI pulse sequence, relationship between the MHD flow related phase in the acquired MR signal, the injection current, and the MRI pulse sequence parameters is stated. Numerical simulations and physical experiments are performed to validate the proposed method. The simulation and experimental results are in agreement and show that the MHD flow related MR phase depends on the amplitude and duration of the flow encoding gradient and the injected current. This method may be used to evaluate the MHD flow of conductive liquid media during MRI scans with simultaneous electrical current injections. The MHD flow related MR phase is 1.5 radian for an injected current of 1 mA amplitude, 30 ms duration and a flow encoding gradient amplitude of 24 mT/m. This large MR phase range exhibits potential use of this method for clinical applications such as investigation of highly conductive cerebrospinal fluid (CSF) during clinical use of electrical current based neuromodulation in MRI. However, very high and time varying velocities of typical CSF flow compared to the MHD flow velocities should also be considered.

Subject Keywords

Nuclear and High Energy Physics, Biophysics, Biochemistry, Condensed Matter Physics

URI

https://hdl.handle.net/11511/40168

Journal

JOURNAL OF MAGNETIC RESONANCE

DOI

https://doi.org/10.1016/j.jmr.2019.04.015

Collections

Department of Electrical and Electronics Engineering, Article

Suggestions

OpenMETU
Core

Studies of jet mass in dijet and W/Z plus jet events Chatrchyan, S.; et. al. (Springer Science and Business Media LLC, 2013-05-01) Invariant mass spectra for jets reconstructed using the anti-k(T) and Cambridge-Aachen algorithms are studied for different jet "grooming" techniques in data corresponding to an integrated luminosity of 5 fb(-1), recorded with the CMS detector in proton-proton collisions at the LHC at a center-of-mass energy of 7 TeV. Leading-order QCD predictions for inclusive dijet and W/Z+jet production combined with parton-shower Monte Carlo models are found to agree overall with the data, and the agreement improves wit...
Transverse momentum spectra of inclusive b jets in pPb collisions atv root s(NN)=5.02 TeV Khachatryan, V.; et. al. (Elsevier BV, 2016-03-01) We present a measurement of b jet transverse momentum (p(T)) spectra in proton-lead (pPb) collisions using a dataset corresponding to about 35nb(-1) collected with the CMS detector at the LHC. Jets from b quark fragmentation are found by exploiting the long lifetime of hadrons containing a b quark through tagging methods using distributions of the secondary vertex mass and displacement. Extracted cross sections for b jets are scaled by the effective number of nucleon-nucleon collisions and are compared to a...
Coil sensitivity map calculation using biot-savart law at 3 tesla and parallel imaging in MRI Esin, Yunus Emre; Alpaslan, Ferda Nur; Department of Computer Engineering (2017) Coil spatial sensitivity map is considered as one of the most valuable data used in parallel magnetic resonance imaging (MRI) reconstruction. In this study, a novel sensitivity map extraction method is introduced for phased-array coils. Proposed technique uses Biot-Savart law with coil shape information and low-resolution phase image data to form sensitivity maps. The performance of this method has been tested in the parallel image reconstruction task using sensitivity encoding technique. In MRI, coil sensi...
Simulations and Experiments of EMFY-1 Electromagnetic Launcher Ceylan, Doga; Karagoz, Mustafa; Cevik, Yasin; Yildirim, Baran; Polat, Hakan; Keysan, Ozan (Institute of Electrical and Electronics Engineers (IEEE), 2019-07-01) ASELSAN Inc. has been conducting experimental research on electromagnetic launch technologies since 2014. The first prototype, EMFY-1, has 25 mm x 25 mm square bore and 3-m-length rails. In addition, two capacitor-based pulsed-power supplies (PPSs) with 1- and 4-MJ stored energy are built to supply launcher. During the design process of EMFY-1, a 3-D finite element (FE) model has been developed to simulate the electromagnetic and mechanical aspects of the railgun. This paper presents the simulation and expe...
Dispersive optical constants of Tl2InGaSe4 single crystals Qasrawi, A. F.; Hasanlı, Nızamı (IOP Publishing, 2007-09-01) The structural and optical properties of Bridgman method grown Tl2InGaSe4 crystals have been investigated by means of room temperature x-ray diffraction, and transmittance and reflectance spectral analysis, respectively. The x-ray diffraction technique has shown that Tl2InGaSe4 is a single phase crystal of a monoclinic unit cell that exhibits the lattice parameters of a = 0.77244 nm, b = 0.64945 nm, c = 0.92205 nm and beta = 95.03 degrees . The optical data have revealed an indirect allowed transition band ...

Citation Formats

H. H. Eroglu, M. Sadighi, and B. M. Eyüboğlu, “Magnetohydrodynamic flow imaging of ionic solutions using electrical current injection and MR phase measurements,” JOURNAL OF MAGNETIC RESONANCE, pp. 128–137, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40168.