Low-field 0.55T T1 mapping for liver: B1+ correction unnecessary, RF spoiling and deep learning crucial

At 0.55T, liver flip angle variation was only 98.2±2.9% vs 94.6±7.4% at 1.5T and 100.7±9.8% at 3T, making B1+ correction unnecessary. Combined RF spoiling correction and deep learning reconstruction enabled accurate T1 mapping.

• Phantom Bland-Altman analysis showed RF spoiling correction had a greater impact on T1 accuracy than B1+ correction.
• Deep learning reconstruction reduced noise-related variability of voxel-wise hepatic T1 estimates.
• Low-field T1 values improve variable flip angle model conditioning, reducing sensitivity to flip angle deviations.

Automated summary

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