B1 transmit phase gradient coil for single-axis TRASE RF encoding

  1. Get@NRC: B1 transmit phase gradient coil for single-axis TRASE RF encoding (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1016/j.mri.2013.03.017
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Journal titleMagnetic Resonance Imaging
Pages891899; # of pages: 9
Subjectarticle; diode; image analysis; image processing; image quality; mathematical analysis; nuclear magnetic resonance imaging; priority journal; process design; process model; process optimization; process technology; signal detection; Transmit Array Spatial Encoding magnetic resonance imaging
AbstractPurpose: TRASE (Transmit Array Spatial Encoding) MRI uses RF transmit phase gradients instead of B0 field gradients for k-space traversal and high-resolution MR image formation. Transmit coil performance is a key determinant of TRASE image quality. The purpose of this work is to design an optimized RF transmit phase gradient array for spatial encoding in a transverse direction (x- or y- axis) for a 0.2T vertical B0 field MRI system, using a single transmitter channel. This requires the generation of two transmit B1 RF fields with uniform amplitude and positive and negative linear phase gradients respectively over the imaging volume. Materials and Methods: A two-element array consisting of a double Maxwell-type coil and a Helmholtz-type coil was designed using 3D field simulations. The phase gradient polarity is set by the relative phase of the RF signals driving the simultaneously energized elements. Results: Field mapping and 1D TRASE imaging experiments confirmed that the constructed coil produced the fields and operated as designed. A substantially larger imaging volume relative to that obtainable from a non-optimized Maxwell-Helmholtz design was achieved. Conclusion: The Maxwell (sine)-Helmholtz (cosine) approach has proven successful for a horizontal phase gradient coil. A similar approach may be useful for other phase-gradient coil designs. © 2013 Elsevier Inc.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21270645
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Record identifier6df4df76-b12a-49cd-9405-69a1492bb00f
Record created2014-02-17
Record modified2016-05-09
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