Technical Note: Long‐term stability of Hounsfield unit calibration for cone beam computed tomography

Purpose The goal of this study was to investigate the stability of a phantom‐based Hounsfield unit (HU) calibration for cone beam CT (CBCT). Methods Three consecutive scans of a large phantom configuration and a small phantom configuration were acquired and reconstructed with a uniform scatter correction method. The CBCT gray values of the phantom inserts were measured and the three values of each insert averaged. The linear calibration curve...