To explore the possibility of application of free breathing intravoxel incoherent motion (IVIM) imaging in pediatric myocarditis patients, we utilized diaphragmatic navigation technique to detect heart rate and improved the probability of scanning success. Eight pediatric myocarditis patients and ten healthy volunteers were enrolled. The study confirmed that the IVIM imaging method with free breathing condition was acceptable and achievable. Besides, compared with healthy children, the microcirculation of myocarditis patients was impaired, and pseudo-diffusion coefficient (Dfast) and perfusion fraction (f) were significantly lower.
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