Quality control of AM parts is still a major challenge due to the complex geometries, rough surfaces, and asymmetric deformation of as printed parts. X-ray computed tomography (CT) is a non-destructive technique that can provide valuable insights into the internal structure and properties of AM parts. In this presentation, we will discuss the benefits of using X-ray CT in researching AM, including the ability to detect defects such as cracks, voids, and inclusions, and to measure the density and deformation of the AM part. We will also highlight the advantages of using advanced CT techniques, such as high-resolution imaging and reconstruction enhanced by deep learning models, to gain a better understanding of the microstructure and mechanical behavior of AM parts. This presentation will share the insights gained from using X-ray CT to optimize the AM process, improve part quality, and reduce costs in various industries and applications of AM.