Local in vivo shimming using adaptive passive shim positioning

Sejung Yang; Hahnsung Kim; Min Oh Ghim; Byung Uk Lee; Dong Hyun Kim

doi:10.1016/j.mri.2010.10.004

Local in vivo shimming using adaptive passive shim positioning

Sejung Yang, Hahnsung Kim, Min Oh Ghim, Byung Uk Lee, Dong Hyun Kim

Electronic and Electrical Engineering

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

12 Scopus citations

Abstract

A subject-specific local in vivo passive shimming method, focusing on the prefrontal and temporal regions, is proposed. The aim of the investigation is to show that subject variability exists in optimal passive shimming and that the proposed method can be effectively used to overcome these differences. A shimming structure capable of adjusting the position of the passive shims to within a millimeter resolution is built. The optimal shim positions for each individual subject are computed from obtained field map using a convex optimization algorithm. Passive shim experiments at predetermined fixed shim positions vs. individually adjusted shim positions were performed and compared. The results show that intersubject variability exists in the optimal shim positions and that the location-sensitive method proposed can be useful for improving main field homogeneity in vivo.

Original language	English
Pages (from-to)	401-407
Number of pages	7
Journal	Magnetic Resonance Imaging
Volume	29
Issue number	3
DOIs	https://doi.org/10.1016/j.mri.2010.10.004
State	Published - Apr 2011

Bibliographical note

Funding Information:
Grant sponsors: This research was supported in part by the Ministry of Knowledge Economy and Korea Industrial Technology Foundation through the Human Resource Training Project for Strategic Technology, by the Young Research Program of the Ministry of Education, Science and Technology of the Republic of Korea ( 20090066931 ) and by the Acceleration Research Program of the Ministry of Education, Science and Technology of the Republic of Korea and the Korea Science and Engineering Foundation ( 2010-001538 ).

Keywords

Magnetic field inhomogeneity correction
Passive shimming

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10.1016/j.mri.2010.10.004

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title = "Local in vivo shimming using adaptive passive shim positioning",

abstract = "A subject-specific local in vivo passive shimming method, focusing on the prefrontal and temporal regions, is proposed. The aim of the investigation is to show that subject variability exists in optimal passive shimming and that the proposed method can be effectively used to overcome these differences. A shimming structure capable of adjusting the position of the passive shims to within a millimeter resolution is built. The optimal shim positions for each individual subject are computed from obtained field map using a convex optimization algorithm. Passive shim experiments at predetermined fixed shim positions vs. individually adjusted shim positions were performed and compared. The results show that intersubject variability exists in the optimal shim positions and that the location-sensitive method proposed can be useful for improving main field homogeneity in vivo.",

keywords = "Magnetic field inhomogeneity correction, Passive shimming",

author = "Sejung Yang and Hahnsung Kim and Ghim, {Min Oh} and Lee, {Byung Uk} and Kim, {Dong Hyun}",

note = "Funding Information: Grant sponsors: This research was supported in part by the Ministry of Knowledge Economy and Korea Industrial Technology Foundation through the Human Resource Training Project for Strategic Technology, by the Young Research Program of the Ministry of Education, Science and Technology of the Republic of Korea ( 20090066931 ) and by the Acceleration Research Program of the Ministry of Education, Science and Technology of the Republic of Korea and the Korea Science and Engineering Foundation ( 2010-001538 ). ",

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doi = "10.1016/j.mri.2010.10.004",

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AU - Kim, Hahnsung

AU - Ghim, Min Oh

AU - Lee, Byung Uk

AU - Kim, Dong Hyun

N1 - Funding Information: Grant sponsors: This research was supported in part by the Ministry of Knowledge Economy and Korea Industrial Technology Foundation through the Human Resource Training Project for Strategic Technology, by the Young Research Program of the Ministry of Education, Science and Technology of the Republic of Korea ( 20090066931 ) and by the Acceleration Research Program of the Ministry of Education, Science and Technology of the Republic of Korea and the Korea Science and Engineering Foundation ( 2010-001538 ).

PY - 2011/4

Y1 - 2011/4

N2 - A subject-specific local in vivo passive shimming method, focusing on the prefrontal and temporal regions, is proposed. The aim of the investigation is to show that subject variability exists in optimal passive shimming and that the proposed method can be effectively used to overcome these differences. A shimming structure capable of adjusting the position of the passive shims to within a millimeter resolution is built. The optimal shim positions for each individual subject are computed from obtained field map using a convex optimization algorithm. Passive shim experiments at predetermined fixed shim positions vs. individually adjusted shim positions were performed and compared. The results show that intersubject variability exists in the optimal shim positions and that the location-sensitive method proposed can be useful for improving main field homogeneity in vivo.

AB - A subject-specific local in vivo passive shimming method, focusing on the prefrontal and temporal regions, is proposed. The aim of the investigation is to show that subject variability exists in optimal passive shimming and that the proposed method can be effectively used to overcome these differences. A shimming structure capable of adjusting the position of the passive shims to within a millimeter resolution is built. The optimal shim positions for each individual subject are computed from obtained field map using a convex optimization algorithm. Passive shim experiments at predetermined fixed shim positions vs. individually adjusted shim positions were performed and compared. The results show that intersubject variability exists in the optimal shim positions and that the location-sensitive method proposed can be useful for improving main field homogeneity in vivo.

KW - Magnetic field inhomogeneity correction

KW - Passive shimming

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JO - Magnetic Resonance Imaging

JF - Magnetic Resonance Imaging

IS - 3

ER -

Local in vivo shimming using adaptive passive shim positioning

Abstract

Bibliographical note

Keywords

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