Currently, the methods of computational fluid dynamics are often used in the clinic to assess the significance of coronary artery stenoses. This approach requires obtaining the 3D geometry of the vessel under study for subsequent use in modeling the movement of blood through it. This article offers a new approach for constructing a 3D model of an artery, based on the volume of fluid (VOF) function methodology, and not on constructing a three-dimensional mesh of the vessel surface. The results of multispiral CT of the heart and its surrounding vessels were used as initial data. A pipeline is presented for obtaining the VOF function of an artery section with stenosis according to CT data.