Noise analysis in magnetic resonance electrical impedance tomography at 3 and 11 T field strengths

Rosalind Sadleir; Samuel Grant; Uk Zhang Sung; Il Lee Byung; Chan Pyo Hyun; Hoon Oh Suk; Chunjae Park; Je Woo Eung; Yeol Lee Soo; Ohin Kwon; Keun Seo Jin

doi:10.1088/0967-3334/26/5/023

Noise analysis in magnetic resonance electrical impedance tomography at 3 and 11 T field strengths

Rosalind Sadleir, Samuel Grant, Uk Zhang Sung, Il Lee Byung, Chan Pyo Hyun, Hoon Oh Suk, Chunjae Park, Je Woo Eung, Yeol Lee Soo, Ohin Kwon, Keun Seo Jin

Department of Computational Science and Engineering

Research output: Contribution to journal › Article › peer-review

90 Citations (Scopus)

Abstract

In magnetic resonance electrical impedance tomography (MREIT), we measure the induced magnetic flux density inside an object subject to an externally injected current. This magnetic flux density is contaminated with noise, which ultimately limits the quality of reconstructed conductivity and current density images. By analysing and experimentally verifying the amount of noise in images gathered from two MREIT systems, we found that a carefully designed MREIT study will be able to reduce noise levels below 0.25 and 0.05 nT at main magnetic field strengths of 3 and 11 T, respectively, at a voxel size of 3 x 3 x 3 mm³. Further noise level reductions can be achieved by optimizing MREIT pulse sequences and using signal averaging. We suggest two different methods to estimate magnetic flux noise levels, and the results are compared to validate the experimental setup of an MREIT system.

Original language	English
Pages (from-to)	875-884
Number of pages	10
Journal	Physiological measurement
Volume	26
Issue number	5
DOIs	https://doi.org/10.1088/0967-3334/26/5/023
Publication status	Published - 2005 Oct 1

All Science Journal Classification (ASJC) codes

Biophysics
Physiology
Biomedical Engineering
Physiology (medical)

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10.1088/0967-3334/26/5/023

Cite this

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title = "Noise analysis in magnetic resonance electrical impedance tomography at 3 and 11 T field strengths",

abstract = "In magnetic resonance electrical impedance tomography (MREIT), we measure the induced magnetic flux density inside an object subject to an externally injected current. This magnetic flux density is contaminated with noise, which ultimately limits the quality of reconstructed conductivity and current density images. By analysing and experimentally verifying the amount of noise in images gathered from two MREIT systems, we found that a carefully designed MREIT study will be able to reduce noise levels below 0.25 and 0.05 nT at main magnetic field strengths of 3 and 11 T, respectively, at a voxel size of 3 x 3 x 3 mm3. Further noise level reductions can be achieved by optimizing MREIT pulse sequences and using signal averaging. We suggest two different methods to estimate magnetic flux noise levels, and the results are compared to validate the experimental setup of an MREIT system.",

keywords = "Electrical impedance tomography, MREIT, MRI, Magnetic flux density, Noise analysis",

author = "Rosalind Sadleir and Samuel Grant and Sung, {Uk Zhang} and Byung, {Il Lee} and Hyun, {Chan Pyo} and Suk, {Hoon Oh} and Chunjae Park and Eung, {Je Woo} and Soo, {Yeol Lee} and Ohin Kwon and Jin, {Keun Seo}",

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T1 - Noise analysis in magnetic resonance electrical impedance tomography at 3 and 11 T field strengths

AU - Sadleir, Rosalind

AU - Grant, Samuel

AU - Sung, Uk Zhang

AU - Byung, Il Lee

AU - Hyun, Chan Pyo

AU - Suk, Hoon Oh

AU - Park, Chunjae

AU - Eung, Je Woo

AU - Soo, Yeol Lee

AU - Kwon, Ohin

AU - Jin, Keun Seo

PY - 2005/10/1

Y1 - 2005/10/1

N2 - In magnetic resonance electrical impedance tomography (MREIT), we measure the induced magnetic flux density inside an object subject to an externally injected current. This magnetic flux density is contaminated with noise, which ultimately limits the quality of reconstructed conductivity and current density images. By analysing and experimentally verifying the amount of noise in images gathered from two MREIT systems, we found that a carefully designed MREIT study will be able to reduce noise levels below 0.25 and 0.05 nT at main magnetic field strengths of 3 and 11 T, respectively, at a voxel size of 3 x 3 x 3 mm3. Further noise level reductions can be achieved by optimizing MREIT pulse sequences and using signal averaging. We suggest two different methods to estimate magnetic flux noise levels, and the results are compared to validate the experimental setup of an MREIT system.

AB - In magnetic resonance electrical impedance tomography (MREIT), we measure the induced magnetic flux density inside an object subject to an externally injected current. This magnetic flux density is contaminated with noise, which ultimately limits the quality of reconstructed conductivity and current density images. By analysing and experimentally verifying the amount of noise in images gathered from two MREIT systems, we found that a carefully designed MREIT study will be able to reduce noise levels below 0.25 and 0.05 nT at main magnetic field strengths of 3 and 11 T, respectively, at a voxel size of 3 x 3 x 3 mm3. Further noise level reductions can be achieved by optimizing MREIT pulse sequences and using signal averaging. We suggest two different methods to estimate magnetic flux noise levels, and the results are compared to validate the experimental setup of an MREIT system.

KW - Electrical impedance tomography

KW - MREIT

KW - MRI

KW - Magnetic flux density

KW - Noise analysis

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SN - 0967-3334

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EP - 884

JO - Physiological measurement

JF - Physiological measurement

IS - 5

ER -

Noise analysis in magnetic resonance electrical impedance tomography at 3 and 11 T field strengths

Abstract

All Science Journal Classification (ASJC) codes

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