Three-dimensional CT image reconstruction – commonly known as 3DCT – is the process of reconstructing the data information acquired from a series of consecutive CT scans into a three-dimensional image through specially prepared 3D software and computer processing. 3D CT can reconstruct the cardiovascular image and display the cardiovascular structure in three dimensions, especially for complex congenital heart disease has obvious advantages compared with cardiac ultrasound, although not as accurate and reliable as cardiovascular imaging, but can display cardiovascular malformations in three dimensions. For children who cannot undergo cardiac catheterization due to disease, this test can be performed with the advantages of low cost and non-invasive trauma. Li Fuhai, Department of Pediatric Internal Medicine, Qilu Hospital, Shandong University