Magnetic field shimming of a permanent magnet using a combination of pieces of permanent magnets and a single-channel shim coil for skeletal age assessment of children

[Display omitted] ► Active shimming using a single-channel (SC) shim coil was combined with passive shimming. ► Easy to design and fabricate the SC shim coil. ► Further correction beyond the limit of passive shimming was obtained by using the SC shim coil. ► The system design was applied to image ex...

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Bibliographic Details
Published in:Journal of magnetic resonance (1997) 2013-05, Vol.230, p.125-133
Main Authors: Terada, Y., Kono, S., Ishizawa, K., Inamura, S., Uchiumi, T., Tamada, D., Kose, K.
Format: Article
Language:English
Subjects:
Adolescent
Adult
Age Determination by Skeleton - methods
B0 shimming
Child
Child, Preschool
Equipment Design
Equipment Failure Analysis
Female
Hand Bones - anatomy & histology
Hand Bones - physiology
Humans
Image Enhancement - instrumentation
Infant
Infant, Newborn
Magnetic Fields
Magnetic Resonance Imaging - instrumentation
Magnetics - instrumentation
Magnets
Male
Middle Aged
Passive shim
Permanent magnet
Reproducibility of Results
Sensitivity and Specificity
Single-channel shim
Transducers
Young Adult
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Summary:[Display omitted] ► Active shimming using a single-channel (SC) shim coil was combined with passive shimming. ► Easy to design and fabricate the SC shim coil. ► Further correction beyond the limit of passive shimming was obtained by using the SC shim coil. ► The system design was applied to image extremities of humans, in particular a child’s hand. We adopted a combination of pieces of permanent magnets and a single-channel (SC) shim coil to shim the magnetic field in a magnetic resonance imaging system dedicated for skeletal age assessment of children. The target magnet was a 0.3-T open and compact permanent magnet tailored to the hand imaging of young children. The homogeneity of the magnetic field was first improved by shimming using pieces of permanent magnets. The residual local inhomogeneity was then compensated for by shimming using the SC shim coil. The effectiveness of the shimming was measured by imaging the left hands of human subjects and evaluating the image quality. The magnetic resonance images for the child subject clearly visualized anatomical structures of all bones necessary for skeletal age assessment, demonstrating the usefulness of combined shimming.
ISSN:1090-7807
1096-0856
DOI:10.1016/j.jmr.2013.02.005