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. 2010 Dec 3;1(1):101–116. doi: 10.1098/rsfs.2010.0005

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Figure 7. — Q ball imaging (QBI) of ventricular myofibre architecture. (a) The reconstructed intravoxel fibre distributions (ODFs) for two voxels with one or multiple fibre orientation. (b) Fractional anisotropy in the posterior fusion site of a canine heart. (c) Goodness-of-fit (R²-coefficient) for the tensor approximation in the same region. (d) Reconstructed intravoxel ODFs from QBI (using Laplace–Beltrami sharpening) showing complex fibre arrangement in the central region of the fusion site. Imaged with a spin-echo protocol using TR/TE = 1800/15 ms, Δ = 7 ms, δ = 2 ms, b = 3000 s mm⁻²; spatial resolution 0.4 × 0.4 × 1.0 mm. The region of interest shown in panels (b,c) is 4.4 × 4.4 mm.