2023
DOI: 10.1109/jerm.2023.3274742
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Calibrating Double-Loop H-Field Probe Measurements of RF Coil Current for MRI

Wenjun Wang,
Juan Diego SΓ‘nchez-Heredia,
Tom Maurouard
et al.

Abstract: A double-loop H-field probe is used to measure current on RF coils for MRI. Direct S parameter measurement, denoted by 𝑆𝑆 21,𝑏𝑏 , is not proportional to coil current. After subtracting the coil-free S parameter, 𝑆𝑆 21,π‘Žπ‘Ž , the quantity 𝑆𝑆 21,cal = 𝑆𝑆 21,𝑏𝑏 βˆ’ 𝑆𝑆 21,π‘Žπ‘Ž is proportional to coil current. The ratio �𝑆𝑆 21,cal /𝐼𝐼 coil οΏ½ is plotted for several setups of different probe size, different coil size and different coil-to-probe distance. For double-loop H-field probes of βŒ€1.3 cm probe… Show more

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