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Development and characterization of an unshielded PatLoc gradient coil for human head imaging

Welz, Anna, Cocosco, Chris, Dewdney, Andrew, Gallichan, Daniel ORCID:, Jia, Feng, Lehr, Heinrich, Liu, Zhenyu, Post, Hans, Schmidt, Hartmut, Schultz, Gerrit, Testud, Frederik, Weber, Hans, Witschey, Walter, Korvink, Jan, Hennig, Juergen and Zaitsev, Maxim 2013. Development and characterization of an unshielded PatLoc gradient coil for human head imaging. Concepts in Magnetic Resonance Part B Magnetic Resonance Engineering 43 (4) , pp. 111-125. 10.1002/cmr.b.21244

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A cylindrical head gradient insert for human imaging with non-linear spatial encoding magnetic fields (SEMs) has been designed, optimized and successfully integrated with a modified 3T clinical MR system. This PatLoc (parallel acquisition technique using localized gradients) SEM coil uses SEMs that resemble second-order magnetic shim fields, but with much higher amplitude as well as the possibility for rapid switching. This work describes the optimization of a coil design and measurement methods to characterize its SEMs, induced self-eddy currents and concomitant fields. Magnetic field maps of the SEMs are measured and it is demonstrated that the induced self-eddy current magnetic fields are small and can be compensated. A method to measure concomitant fields is presented and those fields are compared to simulated data. Finally, in vivo human images acquired using the PatLoc system are presented and discussed.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff University Brain Research Imaging Centre (CUBRIC)
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: gradient technology; non-linear gradient; eddy current; concomitant field
Publisher: Wiley-Blackwell
ISSN: 1552-504X
Date of Acceptance: 5 August 2013
Last Modified: 02 Nov 2022 10:22

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