Non-contrast photon counting computed tomography of the head: optimized modeling of off-focal radiation to reduce calvarium-related tissue inhomogeneity. - Arwed Elias Michael; Martin Petersilka; Denise Schoenbeck; Matthias Michael Woeltjen; Julius Henning Niehoff; Christoph Moenninghoff; Tanja Kurzendorfer; Jan Borggrefe; Lukas Goertz; Jan Robert Kroeger (BMC Medical Imaging, 2025)