Welz, Anna, Cocosco, Chris, Dewdney, Andrew, Gallichan, Daniel  ORCID: https://orcid.org/0000-0002-0143-2855, 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
|
Abstract
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: | Research Institutes & Centres > Cardiff University Brain Research Imaging Centre (CUBRIC) Schools > Engineering |
| 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 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/98401 |
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