Here, the sample is rotated by 360 degree while line images are taken. Based on this data, a sectional image of the irradiated spot is created.
In order to create more sectional images, the sample is moved slowly through the fanned beam. Then, a three-dimensional image can be recreated based on a series of sectional images. Once there is a series of sectional images, volume reconstruction may be performed and the result be displayed as several sectional or one three-dimensional image.
This procedure is more time-consuming than computed tomography using a cone beam, but is very precise and is the approach of choice for dimensional measuring.