In Vivo 3D Liver Imaging at 7 T Using kT-Point pTx Pulses and a 32-Tx-Channel Whole-Body Radiofrequency Coil Array.

ABSTRACT: At 7 T, a main challenge is the flip angle variations arising from the spatially inhomogeneous B₁ ⁺ transmit profiles of the RF coils. To address this problem, static pTx with local pTx body arrays has been used. However, for larger organs, such as the liver, local arrays provide insufficient homogeneity, and often dynamic pTx is needed. In this study, the benefits of a 32-Tx-channel remote array are shown. Relative channel-wise 3D B₁ ⁺ maps are acquired in free breathing in 11:38 min with a radial phase encoding (RPE) acquisition scheme in five healthy volunteers at 7 T. For each subject, an ROI is drawn manually covering the whole liver. The necessary number of k_T-point pTx pulses is analyzed by comparing L-curves that depict the tra

SUBMITTER: Grimm JA 

PROVIDER: S-EPMC12560210 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature