ArticleMagnetic resonance in medicine2026
Enhanced Transmit Efficiency of a Loop Array Combined With Out-of-Phase Passive Dipoles for Thoracic Spinal Cord MRI at 7T.
Article in Magnetic resonance in medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeThe design of radiofrequency (RF) coils tailored for the target anatomy is necessary to overcome the transmit field homogeneity and penetration issues at Ultra-High-Field (UHF). For the spinal cord, the optimal design has not yet been determined. This work intends to demonstrate the added value of a pair of passive dipoles placed under a conventional thoracic spine 4 × 2-loop array.
methodsThe conventional loop array produces a broad transmit field with unnecessary lateral spread. To address this, two passive dipoles were incorporated and tuned out-of-phase to actively suppress these lateral side-lobes and increase field penetration the spinal cord region. The design was numerically optimised using a homogeneous phantom, followed by human voxel model simulations to evaluate performance and specific absorption rate (SAR). Finally, a prototype was tested in a 7T scanner using a homogeneous phantom to acquire experimental
resultsHuman voxel model simulations demonstrated that the passive dipoles improve the
conclusionIncorporating passive dipoles effectively suppresses unwanted lateral field spread, increasing penetration depth and
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