Abstract #4502

Retrospective transmission field (B1+) and sensitivity profile (B1-) correction for transceive surface RF coils: an empirical solution for RARE

Paula Ramos Delgado¹, Andre Kuehne², Ludger Starke¹, Jason M. Millward¹, Joao Periquito¹, Thoralf Niendorf^1,3, Sonia Waiczies¹, and Andreas Pohlmann¹

¹Berlin Ultrahigh Field Facility (B.U.F.F), Max Delbrück Center for Molecular Medicine, Berlin, Germany, ²MRI.tools GmbH, Berlin, Germany, ³Experimental and Clinical Research Center, a joint cooperation between the Charité Medical Faculty and the Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany

Improving the low signal-to-noise ratio (SNR) inherent to emerging MRI methods such as fluorine MRI is challenging. To enhance sensitivity, SNR-efficient pulse sequences such as RARE and cryogenically-cooled surface RF coils (CRP) are used. Transceive surface RF coils show variation in the excitation field (B₁⁺), impairing quantification. To compensate, previous studies have used an analytical signal intensity equation to perform a retrospective B₁⁺-correction. However, this is unfeasible for RARE due to the absence of such an equation. To overcome this challenge, we propose and validate a numerical method using experimental data acquired with a volume resonator (reference) and a ¹H-CRP.

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