ArticleMedical physics2026
Impact of transducer position on B
Article in Medical physics, 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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Authors and funding
5 authors.
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Abstract
backgroundTranscranial magnetic resonance-guided focused ultrasound (tcMRgFUS) allows precise focal heating under magnetic resonance imaging (MRI) guidance for neurological therapies. However, large hemispherical transducers inherently affect the transmit radiofrequency (RF) field (|B PURPOSE: As the position and orientation of the transducer vary in practice, we assessed the effects of such changes on the |B
methodsThree-dimensional (3D) finite-difference time-domain simulations were performed using Sim4Life (v7.2.1, ZMT, Zürich, Switzerland). The simulation model comprised a 16-leg high-pass birdcage RF coil matched to a standard clinical 3T whole-body scanner (bore diameter: 600 mm), a generic hemispherical tcMRgFUS system (transducer and water bolus), and a Duke human model. A spatial voxel mesh was applied with a maximum size of 2×2×2 mm
resultsLateral and vertical translations (± x and ± y) that brought the transducer closer to the head intensified EM coupling between the RF coil and the transducer, increasing |B
conclusionsThese results demonstrate that transducer position and angle substantially affect |B
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