Graham C. Wiggins
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View article: The “Loopole” Antenna: A Hybrid Coil Combining Loop and Electric Dipole Properties for Ultra-High-Field MRI
The “Loopole” Antenna: A Hybrid Coil Combining Loop and Electric Dipole Properties for Ultra-High-Field MRI Open
Purpose . To revisit the “loopole,” an unusual coil topology whose unbalanced current distribution captures both loop and electric dipole properties, which can be advantageous in ultra-high-field MRI. Methods . Loopole coils were built by …
View article: Size‐adaptable “Trellis” structure for tailored MRI coil arrays
Size‐adaptable “Trellis” structure for tailored MRI coil arrays Open
Purpose We present a novel, geometrically adjustable, receive coil array whose diameter can be tailored to the subject in order to maximize sensitivity for a range of body sizes. Theory and Methods A key mechanical feature of the size‐adap…
View article: The Optimality Principle for MR signal excitation and reception: New physical insights into ideal radiofrequency coil design
The Optimality Principle for MR signal excitation and reception: New physical insights into ideal radiofrequency coil design Open
Purpose: Despite decades of collective experience, radiofrequency coil optimization for MR has remained a largely empirical process, with clear insight into what might constitute truly task-optimal, as opposed to merely 'good,' coil perfor…
View article: Issue Information
Issue Information Open
of mathematics, computing, engineering, physics, biophysics, chemistry, biochemistry, and physiology directly relevant to magnetic resonance will be accepted, as well as methodology-oriented clinical studies.
View article: A rigid, stand‐off hybrid dipole, and birdcage coil array for 7 T body imaging
A rigid, stand‐off hybrid dipole, and birdcage coil array for 7 T body imaging Open
Purpose To design a robust and patient friendly radiofrequency coil array (8‐channel transmit and 16‐channel receive) for cross‐sectional body imaging at 7 T, and to improve our understanding of the combination of dipole and loop like elem…
View article: A method to assess the loss of a dipole antenna for ultra‐high‐field MRI
A method to assess the loss of a dipole antenna for ultra‐high‐field MRI Open
Purpose To describe a new bench measurement based on quality ( Q ) factors to estimate the coil noise relative to the sample noise of dipole antennas at 7 T. Methods Placing a dipole antenna close to a highly conductive sample surrogate (H…
View article: Multiparametric imaging with heterogeneous radiofrequency fields
Multiparametric imaging with heterogeneous radiofrequency fields Open
View article: Optimized, Minimal Specific Absorption Rate MRI for High-Resolution Imaging in Patients with Implanted Deep Brain Stimulation Electrodes
Optimized, Minimal Specific Absorption Rate MRI for High-Resolution Imaging in Patients with Implanted Deep Brain Stimulation Electrodes Open
Obtaining high-resolution brain MR imaging in patients with a previously implanted deep brain stimulator has been challenging and avoided by many centers due to safety concerns relating to implantable devices. We present our experience wit…
View article: A flexible nested sodium and proton coil array with wideband matching for knee cartilage MRI at 3T
A flexible nested sodium and proton coil array with wideband matching for knee cartilage MRI at 3T Open
Purpose We describe a 2 × 6 channel sodium/proton array for knee MRI at 3T. Multielement coil arrays are desirable because of well‐known signal‐to‐noise ratio advantages over volume and single‐element coils. However, low tissue–coil coupli…
View article: Accelerated and motion‐robust in vivo <scp>T</scp><sub>2</sub> mapping from radially undersampled data using bloch‐simulation‐based iterative reconstruction
Accelerated and motion‐robust in vivo <span>T</span><sub>2</sub> mapping from radially undersampled data using bloch‐simulation‐based iterative reconstruction Open
Purpose Development of a quantitative transverse relaxation time (T 2 )‐mapping platform that operates at clinically feasible timescales by employing advanced image reconstruction of radially undersampled multi spin‐echo (MSE) datasets. Me…