Hand posture affects brain-function measures associated with listening to speech

Tsunoda, Koichi; Takazawa, Mihiro; Sekimoto, Satoshi; Itoh, Kenji; Baer, Thomas

doi:10.1038/s41598-020-59909-0

Cited by 1 publication

(1 citation statement)

References 11 publications

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“…[16][17][18] A body loop, which can be formed when two individual body parts are in contact with each other, is a common phenomenon during some special scans. [19][20][21][22][23][24] For example, during breast scans, patients form a body loop with their arms, 25 which could lead to unexpected RFinduced heating. 26,27 Moreover, burns at the junction of the thighs were observed in two injury reports.…”

Section: Introductionmentioning

confidence: 99%

Body‐loop related MRI radiofrequency‐induced heating hazards: Observations, characterizations, and recommendations

Yang

Zheng

Wang

et al. 2021

Magnetic Resonance in Med

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To assess RF-induced heating hazards in 1.5T MR systems caused by body-loop postures. Methods: 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. Results: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. Conclusion: 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.

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Section: Introductionmentioning

confidence: 99%

Body‐loop related MRI radiofrequency‐induced heating hazards: Observations, characterizations, and recommendations

Yang

Zheng

Wang

et al. 2021

Magnetic Resonance in Med

View full text Add to dashboard Cite

show abstract

Hand posture affects brain-function measures associated with listening to speech

Abstract: The results showed that crossed posture can lead to different results than parallel posture with respect to asymmetric functional connectivity, especially during non-resting state.

Cited by 1 publication

References 11 publications

Body‐loop related MRI radiofrequency‐induced heating hazards: Observations, characterizations, and recommendations

Body‐loop related MRI radiofrequency‐induced heating hazards: Observations, characterizations, and recommendations

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