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Fig. 4 | Journal of Cardiovascular Magnetic Resonance

Fig. 4

From: The impact of signal-to-noise ratio, diffusion-weighted directions and image resolution in cardiac diffusion tensor imaging – insights from the ex-vivo rat heart

Fig. 4

Accuracy of parameters (% error relative to ground truth) at varying ND and SNRnon-DW. In general, λ3 requires higher SNRnon-DW and/or DW directions in order to achieve the same accuracy as λ1. λ2 is intermediate to λ1 and λ3 in terms of requirements. At SNRnon-DW < 5, mean ADC is underestimated as a result of the positive signal bias from the Rician noise, but has accuracy within ±1% for SNRnon-DW > 8 and ND > 12. FA is systematically overestimated, and has the most stringent requirements for accurate estimation. The E2A magnitude is also systematically overestimated. The contour lines represent the error compared to the ground-truth data in (%) for MD, FA and eigenvalues, and in (°) for angle maps

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