Objective <p>To quantify the T₁ relaxation times at 7T for key abdominal organs and tissues, including the liver, kidney, spleen, and skeletal paraspinal muscles.</p> Materials and methods <p>T₁ mapping was performed on a 7T whole-body scanner with a parallel transmission (pTx) system in five healthy volunteers. Static pTx (B₁⁺ shimming) was applied to maximize B₁⁺ magnitude in the target region. For each T₁ map, data were collected using eight snapshot gradient-echo inversion recovery sequences during breath holding. Voxel-wise T₁ values were calculated based on DICOM data using exponential model fitting.</p> Results <p>Mean abdomen T₁ values and corresponding coefficients of variation across the group were: 1829 ± 60&#xa0;ms, 3.3% for the kidney cortex; 2619 ± 83&#xa0;ms, 3.2% for the kidney medulla; 1378 ± 48&#xa0;ms, 3.5% for the liver; 1954 ± 28&#xa0;ms, 1.4% for the skeletal paraspinal muscle; 1770 ± 36&#xa0;ms, 2.0% for the spleen.</p> Conclusion <p>In this study, we quantified the T₁ relaxation times at 7T for key abdominal organs and tissues, including the liver, kidney, spleen, and skeletal paraspinal muscle. To achieve this, pTx was applied to mitigate B₁⁺ dropouts in the target regions. The B₁⁺ insensitive snapshot gradient-echo inversion recovery method was utilized to acquire accurate and reproducible T₁ maps.</p>