ArticleMagnetic resonance in medicine2025
Mimicking focused ultrasound with a loop coil in acoustic radiation force imaging.
Article in Magnetic resonance in medicine, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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Who cites it
2 citing papers in PubMed.
- Mimicking focused ultrasound with a loop coil in acoustic radiation force imaging.Magnetic resonance in medicine · 2025Article
- Magnitude preparation-based MR-acoustic radiation force imaging.Magnetic resonance in medicine · 2025Article
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Authors and funding
3 authors.
Funding
Abstract
purposeTo enable development of MR-acoustic radiation force imaging (MR-ARFI) methods for targeting ultrasound in human subjects without the regulatory, acoustic, or hardware challenges associated with actual transcranial ultrasound setups.
methodsMR-ARFI is a phase-contrast imaging method that measures focal tissue displacement produced by an ultrasound transducer, when the transducer is pulsed simultaneously with a motion encoding gradient. The ultrasound-induced focal phase shift can be mimicked with a small loop coil that is driven by a DC pulse to produce a resonance frequency offset at the same time as the ultrasound pulse in an MR-ARFI pulse sequence. A coil was designed and built for use in MR-ARFI. Its focus size was characterized, its field map was measured, and volunteer experiments were performed to demonstrate its function in transcranial phase-contrast and magnetization-prepared MR-ARFI.
resultsOff-resonance field maps measured with the constructed loop coil were within 0.87% of simulations in a slice 15 mm from the coil's surface. Its "focus" further had a full-width-at-half-maximum of 22.9 mm in simulation versus 22.7 mm in the field map. In vivo results showed that the same coil driven with 13.7 mA current produced a phase shift corresponding to a realistic effective displacement of 3.5
conclusionA pulsed DC loop coil can mimic ARF-induced displacements in vivo, facilitating development of MR-ARFI methods in vivo.
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