Ritzmann S, Urban P. Designing the Spatial star as a three-dimensional derivate of the Siemens star and developing the methods to determine the accuracy, resolution and spatial frequency response from a 3D scan of the Spatial star. J. Print Media Technol. Res. [Internet]. 2022 Feb. 3 [cited 2024 May 6];10(4):231-45. Available from: http://jpmtr.org/index.php/journal/article/view/31