High-quality magnetic resonance urography (MRU) is clinically valuable to provide a comprehensive evaluation of the renal function and urinary tract in children without ionizing radiation. However, respiration-related patient motion remains a major challenge that impairs diagnostic image quality and hampers an accurate quantitative analysis. In this study, we adopt a novel high temporospatial resolution dynamic-contrast-enhanced (DCE) MRI technique based on 3D radial stack-of-stars gradient-echo sequence acquisition in combination with elliptical variable density k-space scheme for morphological and quantitative MRU and demonstrate its motion robustness in small children in free breathing without sedation.
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