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- W3190205560 abstract "To assess RF-induced heating hazards in 1.5T MR systems caused by body-loop postures.Twelve advanced high-resolution anatomically correct human body models with different body-loop postures are created based on poseable human adult male models. Numerical simulations are performed to assess the radiofrequency (RF)-induced heating of these 12 models at 11 landmarks. A customized phantom is developed to validate the numerical simulations and quantitatively analyze factors affecting the RF-induced heating, eg, the contact area, the loop size, and the loading position. The RF-induced heating inside three differently posed phantoms is measured.The RF-induced heating from the body-loop postures can be up to 11 times higher than that from the original posture. The RF-induced heating increases with increasing body-loop size and decreasing contact area. The magnetic flux increases when the body-loop center and the RF coil isocenter are close to each other, leading to increased RF-induced heating. An air gap created in the body loop or generating a polarized magnetic field parallel to the body loop can reduce the heating by a factor of three at least. Experimental measurements are provided, validating the correctness of the numerical results.Safe patient posture during MR examinations is recommended with the use of insulation materials to prevent loop formation and consequently avoiding high RF-induced heating. If body loops cannot be avoided, the body loop should be placed outside the RF transmitting coil. In addition, linear polarization with magnetic fields parallel to the body loop can be used to circumvent high RF-induced heating." @default.
- W3190205560 created "2021-08-16" @default.
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- W3190205560 date "2021-08-06" @default.
- W3190205560 modified "2023-10-18" @default.
- W3190205560 title "Body‐loop related MRI radiofrequency‐induced heating hazards: Observations, characterizations, and recommendations" @default.
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- W3190205560 doi "https://doi.org/10.1002/mrm.28954" @default.
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