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Simulation-driven design and optimization of RF coil arrays for MRI| old_uid | 12756 |
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| title | Simulation-driven design and optimization of RF coil arrays for MRI |
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| start_date | 2013/09/09 |
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| schedule | 11h |
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| online | no |
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| location_info | NeuroSpin Amphi |
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| summary | We provide recommendations for simulation-driven design and work-flow for magnetic resonance imaging RF transmit-coil arrays. To enable final decisions on array construction, accurate knowledge is needed of how the array transmit and safety measures depend on the array geometry, RF component losses, and the tuning and excitation conditions. If strong evidence is provided that array safety excitation efficiency is insensitive to tuning condition, head geometry and head position, the safety margin can be reduced, allowing shorter scan times.
Use of fully parameterized 3-D and RF circuit models, and customized scripts for several time-consuming post-processing steps resulted in fast and continuous (24/7) generation of useful and important results. The high simulation speed allowed sensitivity analysis to be conducted for the most important dependencies – array diameter, human model position and tuning condition. For a dual-row array of 280 mm in diameter, as compared with a dual-row array of 250 or 230 mm in diameter, the safety excitation efficiency is higher and a lower margin of error is needed to maintain safety in operation. The impact of the tuning conditions and head position on the spatial-average 10-gram SAR significantly increases when the distance between the human model and the array decreases. |
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| responsibles | <not specified> |
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